Unintegrated gluon distribution of a nucleus and photon-jet correlations (2009)
An impact parameter dependent unintegrated gluon distribution is constructed as a solution of a nonlinear evolution equation with realistic Glauber--Gribov input. Photon--jet correlations in the...
Central exclusive photoproduction at the LHC (2009)
Cisek, A., Schäfer, W., Szczurek, A.
Protons and antiprotons at collider energies are a source of high energy Weizsaecker--Williams photons. This opens up a possibility to study at the LHC exclusive photoproduction of heavy vector...
Cisek, A., Schäfer, W., Szczurek, A.
We extend the k_\perp-factorization formalism for exclusive photoproduction of vector mesons to the production of electroweak Z^0 bosons. Predictions for the gamma p \to Z^0 p and p p \to p p Z^0...
Exclusive production of rho^0 rho^0 pairs in gamma-gamma collisions at RHIC (2009)
Kłusek, M., Schäfer, W., Szczurek, A.
We discuss exclusive electromagnetic production of two neutral $\rho$ mesons in coherent photon-photon processes in ultrarelativistic heavy-ion collisions. The cross section is calculated in the...
The proactive initiative ManuFuture roadmap (2009)
Westkämper, E., Carpanzano, E., Constantinescu, C., Decubber, C., Elsner, P., Groothedde, R., ...
Einstein Gravity Explorera medium-class fundamental physics mission (2009)
Schiller, S., Tino, G., Gill, P., Salomon, C., Sterr, U., Peik, E., ...
S. Bedrick, A. Bauch, A. Moudrak, W. Schäfer
Under contract to the European Space Agency (ESA), an expert team lead by Kayser-Threde GmbH has elaborated a design concept for the Precise Time Facility (PTF) for Europe’s satellite positioning...
Unitarity cutting rules for hard processes on nuclei (2008)
Heavy nuclei introduce a new scale into the pQCD description of hard processes on nuclei, the saturation scale, and the familiar linear k_\perp-factorization breaks down. It is replaced by a new...
Multipomeron Cuts and Hard Processes on Nuclei (2008)
With nuclear targets comes a new scale into the pQCD description of hard processes - the saturation scale. In the saturation regime, the familiar linear k_\perp-factorization breaks down and must be...
Flechtner, F., Neumayer, K. H., Kusche, J., Schäfer, W., Sohl, F.
A simulation study has been performed at GFZ Potsdam, which shows the anticipated improvement of the lunar gravity field model with respect to current (LP150Q model) or near-future (SELENE) knowledge...
Unitarity Cutting Rules for Hard Processes on Nuclear Targets (2008)
Unitarity cutting rules for the multiplicity of cut Pomerons, or topological cross sections, have been obtained within the framework of nonlinear k_t factorisation. Proper account for the color...
Exclusive photoproduction of Upsilon: from HERA to Tevatron (2008)
Rybarska, A., Schäfer, W., Szczurek, A.
The forward photoproduction amplitude for gamma p to Upsilon p is calculated in a pQCD k_t-factorization approach with an unintegrated gluon distribution constrained by inclusive deep-inelastic...
Process Mining Framework for Software Processes (2008)
V. Rubin, C. W. Günther, E. Kindler, W. Schäfer
Abstract. Software development processes are often not explicitly modelled and sometimes even chaotic. In order to keep track of the involved documents and files, engineers use software configuration...
UML basierte Spezifikation von (2008)
Michael Kisker, Prof Dr, W. Schäfer, Prof Dr, G. Engels
für den integrierten Studiengang Informatik
Micro- and nanomanufacturing strategic research agenda (2008)
Ratchev, S., Turitto, M., Schäfer, W.
The presented strategic research agenda (SRA) is a product of the concerted effort of the European Micro- and Nanomanufacturing technology platform MINAM. The MINAM platform has been created to...
Neues Verfahren zur Montage von Mikro-Komponenten (2008)
Sandmaier, H., Sägebarth, J., Boufercha, N., Schäfer, W., Othman, N., Schlenker, D., ...
Electronic components (for instance RFID) will in the future be smaller and smaller. Mechanical assembly systems used today are not able to follow this downsizing in a proper way. The research...
MINAM - micro and nano manufacturing at European level (2008)
Schäfer, W., Zimmer, K., Burke, T., Reinhardt, A.
More than 150 high-ranking representatives of the European Commission, from industry and research institutes all over Europe, including countries like Russia and Turkey, met in Brussels from January...
Micro-assembly with fluids (2008)
Boufercha, N., Sägebarth, J., Burgard, M., Othman, N., Schlenker, D., Schäfer, W., ...
New applications and the reduction of costs will lead to smaller and thinner electronic chips. Polymer electronics can help for a few applications, but more complex solutions will stay on silicon for...
Mikromontage mit Flüssigkeiten (2008)
Boufercha, N., Sägebarth, J., Othman, N., Schäfer, W., Schlenker, D., Burgard, M., ...
Mikrochips mit einer Kantenlänge von weniger als 500 µm sind eine Herausforderung für die Handhabung, Positionierung und Montage. Als Alternative zum verbreiteten Pick-and-Place-Prinzip wird in...
MINAM - micro and nano manufacturing at European level (2008)
Micro and Nano technological products are increasing rapidly in sectors such as medical, automotive and consumer. To produce these new products appropriate manufacturing technologies are needed. The...
Ultrasonic and eddy current inspection of rail wheels and wheel set axles (2008)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Bessert, S., Schäfer, W., ...
As a means of transport, the railway is gaining in importance, and this has inspired a large number of innovations. International rail traffic, for example, and logistics solutions need to be...
Glide systems of hematite single crystals in deformation experiments (2008)
Siemes, H., Klingenberg, B., Rybacki, E., Naumann, M., Schäfer, W., Jansen, E., ...
FluidAssem - a new method of fluidic-based assembly with surface tension (2008)
Boufercha, N., Sägebarth, J., Burgard, M., Othman, N., Schlenker, D., Schäfer, W., ...
Regarding electronic components the reduction of costs will be a challenging goal in the next years. The use of polymer electronics will not help to solve this problem. Cheap products made of silicon...
Ultrasonic and Eddy-current inspection of rail wheels and wheel set axles (2008)
Rockstroh, B., Kappes, W., Walte, F., Kröning, M., Bessert, S., Schäfer, W., ...
As a means of transport, the railway is gaining in importance, and this has inspired a large number of innovations. International rail traffic, for example, and logistics solutions need to be...
Neue Frontend-Elektronik für die Ultraschall- und Wirbelstromprüfung von Rädern und Wellen (2008)
Rockstroh, B., Kappes, W., Walte, F., Bulavinov, A., Bessert, S., Bähr, W., ...
Micro- and nanomanufacturing. (2008)
Ratchev, S., Turitto, M., Dimov, S., Fillon, B., Dickerhof, M., Schäfer, W., ...
Strategic Research Agenda (January 2008)
Exclusive photoproduction of $J/\psi$ in proton-proton and proton-antiproton scattering (2007)
Protons and antiprotons at collider energies are a source of high energy Weizs\"acker--Williams photons. This may open a possibility to study exclusive photoproduction of heavy vector mesons at...
Micro- and NanoManufacturing (MINAM) Community (2007)
Since many years there are research activities in the field of micro and nanotechnology. Nowadays new product innovations are not imaginable withour micro and nanotechnology. A very important...
Selfassembly of micro components with microfluidics (2007)
Boufercha, N., Sägebarth, J., Burgard, M., Othman, N., Schäfer, W., Sandmaier, H.
Latest roadmaps indicatre that the size of assembled silicon chips will dramatically be reduced. The size of these chips will be less than 500qm x 500 qm and will have a thickness lower than 50 to 70...
Influences of nanostructured interfaces on microfluidics (2007)
Boufercha, N., Schäfer, W., Sägebarth, J., Sandmaier, H.
In the future the assembly technology of smallest chips will get more and more important. The conventional manufacturing methods now reach the limit in case of the accuracy of position, throughput...
Mobile system for test of hollow axels (2007)
Rockstroh, B., Kappes, W., Bähr, W., Schäfer, W., Schallert, R., Piper, W., ...
The hollow drilled axle tester is designed for mechanised ultrasonic testing of mounted axles with a view to detecting cross-cracking. Based on Deutsche Bahn AG specifi cations, the system was...
Tetzlaff, B., Kunkel, R., Schäfer, W., Wendland, F.
The implementation of the EU Water Framework Directive (EU-WFD) forms the background of the WAgriCo-project (Water Resources Management in Cooperation with Agriculture). WagriCo concentrates on the...
Tetzlaff, B., Kunkel, R., Schäfer, W., Wendland, F.
The implementation of the EU Water Framework Directive (EU-WFD) forms the background of the WAgriCo-project (Water Resources Management in Cooperation with Agriculture). WagriCo concentrates on the...
B. Tetzlaff, R. Kunkel, W. Schäfer, F. Wendland
The implementation of the EU Water Framework Directive (EU-WFD) forms the background of the WAgriCo-project (Water Resources Management in Cooperation with Agriculture). WagriCo concentrates on the...
Nonlinear k_t factorisation: recent progress and perspectives (2006)
Hard scattering in a strongly absorptive regime requires a novel nonlinear k_t -- factorization. Here we discuss two recent developments: firstly the evaluation of radiative corrections to single...
Unitarity constraints for DIS off nuclei: predictions for electron-ion colliders (2006)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Future electron-ion colliders (eIC) will focus on the unitarity properties of deep inelastic scattering (DIS) in the limit of strong nuclear absorption. Strong nuclear shadowing and a large abundance...
Forward pion production at large transverse momenta in pp collisions and beyond (2006)
The inclusive production of high-p_\perp particles (pions) in the beam fragmentation regions of high-energy hadronic collisions is driven by the breakup of valence constituents of the beam hadrons...
At the partonic level, a typical final state in small-x deep inelastic scattering off nuclei and hard proton-nucleus collisions can be characterized by the multiplicity of color-excited nucleons....
We report the first derivation of the Landau-Pomeranchuk-Migdal effect for leading jets at fixed values of the transverse momentum p_t in the beam fragmentation region of hadron-nucleus collisions...
Glue in the pomeron from nonlinear k_\perp-factorization (2006)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We derive the nonlinear k_\perp-factorization for the spectrum of jets in high-mass diffractive deep inelastic scattering as a function of three hard scales - the virtuality of the photon Q^2, the...
Roadmap NanoManufacturing: March until July 2006. EU-projects CA IPMMAN and CA MicroSapient (2006)
The Roadmap "NanoManufacturing" shows the development of the production technology for NanoMaterials and NanoSurfaces during next years. It expresses, that some technologies are already successfully...
New ultrasound testing systems for the production testing of rail wheels (2006)
Rockstroh, B., Walte, F., Kappes, W., Bessert, S., Kröning, M., Schäfer, W., ...
Previous standards for the manufacturing inspection of railroad wheels using ultrasound, such as UIC 812, have been replaced by new standards, for example EN 13262 and RD32.144-2000, both requiring...
Ultraschallprüfsysteme für die Produktionsprüfung von Eisenbahnrädern (2006)
Rockstroh, B., Walte, F., Kappes, W., Bessert, S., Kröning, M., Schäfer, W., ...
In both passenger and freight operation, railway wheels are subject to high dynamic stresses. Highspeed passenger services as well as the transport of cost-intensive and hazardous freight put a...
The Working Group NanoManufacturing - a new initiative on European level (2006)
Today new products in nearly all sectors like medicine, automotive, energy, textile are not imaginable without Nanotechnology. Europe has the opportunity to gain the worldwide leadership in this...
Creating a European Micro- and NanoManufacturing Industry (2006)
Dorner, J., Schäfer, W., Ratchev, S., Hitendra, H., Dickerhof, M., ...
Nonlinear $k_{\perp}$-factorization: a new paradigm for an in-nucleus hard QCD (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review the origin, and salient features, of the breaking of the conventional linear $k_{\perp}$-factorization for an in-nucleus hard pQCD processes. A realization of the nonlinear...
Nonlinear k_\perp-factorization for Gluon-Gluon Dijets Produced off Nuclear Targets (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G.
The origin of the breaking of conventional linear k_\perp-factorization for hard processes in a nuclear environment is by now well established. The realization of the nonlinear nuclear...
Nonlinear k_\perp-factorization for Quark-Gluon Dijet Production off Nuclei (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
The breaking of conventional linear k_\perp-factorization for hard processes in a nuclear environment is by now well established. Here we report a detailed derivation of the nonlinear...
Nonuniversality Aspects of Nonlinear k_\perp-factorization for Hard Dijets (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G.
The origin of the breaking of conventional linear k_\perp-factorization for hard processes in a nuclear environment is by now well established. The realization of the nonlinear nuclear...
Biogas from manure – a new technology to close the nutrient and energy circuit on-farm (2005)
Schäfer, W., Evers, L., Lehto, M., Sorvala, S., Teye, F., Granstedt, A.
The Biodynamic Research Institute in Järna developed a two-phase on-farm biogas plant. The plant digests manure of dairy cattle and organic residues originating from the farm and the surrounding...
Hard Scattering in a Nuclear Environment: Farewell to Linear $k_{\perp}$-Factorization (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We discuss a dramatic change brought into the pQCD description of hard processes in a nuclear environment by a large thickness of heavy nuclei. It breaks the familiar linear $k_{\perp}$-factorization...
Khanna, P.K., Hornbostel, B., Burgard, M., Schäfer, W., Dorner, J.
This paper broadly illustrates the preparation of previous three-dimensional shapes in low-temperature-cofired ceramics (LTCC). Test structures are fabricated by previous moulding single-layer green...
CodeSonar: Ein Plugin-basierter Regelinferierender Code-Browser (2005)
Die Qualität von Softwareprodukten gewinnt immer mehr an Bedeutung. Doch wie erhält man ein qualitatives Produkt und vor allem wie kann man die Qualität messen? Um die Softwarequalität zu...
Nonuniversality aspects of nonlinear k(T)-factorization for hard dijets (2005)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G.
This version is available at the following Publisher URL: http://prl.aps.org
"Breaking of k[perpendicular]-factorization for single jet production off nuclei" (2005)
This version is available at the following Publisher URL: http://prd.aps.org
Biogas from manure – a new technology to close the nutrient and energy circuit on-farm (2005)
Schäfer, W., Evers, L., Lehto, M., Sorvala, S., Teye, F., Granstedt, A.
The Biodynamic Research Institute in Järna developed a two-phase on-farm biogas plant. The plant digests manure of dairy cattle and organic residues originating from the farm and the surrounding...
k_perp-factorization for Hard Processes on Nuclei in the Saturation Regime (2004)
We discuss applications of the recently developed nonlinear k_perp--factorization for hard processes on nuclei. The starting point is the color dipole approach which allows to introduce the concept...
Breaking of k_\perp-factorization for Single Jet Production off Nuclei (2004)
The linear k_\perp-factorization is part and parcel of the pQCD description of high energy hard processes off free nucleons. In the case of heavy nuclear targets the very concept of nuclear parton...
Evolution of high-mass diffraction from the light quark valence component of the pomeron (2004)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We analyze the contribution from excitation of the $(q\bar q)(f\bar f),(q\bar q)g_1...g_n(f\bar f)$ Fock states of the photon to high mass diffraction in DIS. We show that the large $Q^2$ behavior of...
Color dipoles and k_t factorization for nuclei (2004)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We discuss applications of the color dipole approach to hard processes on nuclei. We focus on the relation to k_t--factorisation and the role of a nuclear unintegrated gluon distribution in single--...
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Based on an approach to non-Abelian propagation of color dipoles in a nuclear medium we formulate a nonlinear k_t-factorization for the breakup of photons and pions into forward hard dijets in terms...
Microsystems are more and more used in mechanical engineering. The article exemplary describes current and future capabilities.
MEMS and microsystems based on low-temperature cofired ceramics: A cost analysis (2004)
Khanna, P.K., Hornbostel, B., Jäger, T., Schäfer, W.
Low temperature cofired ceramics (LTCC) is an emerging technology for production of micro electromechanical systems (MEMS) and micro system technology (MST) components. Due to its inherent advantages...
Khanna, P.K., Hornbostel, B., Grimme, R., Schäfer, W., Dorner, J.
A novel method to fabricate pressure sensors using low-temperature-cofired ceramics (LTCC) and polyvinylidene fluoride (PVDF) piezoelectric polymer is presented. The basic structure consists...
Impact of saturation on s-channel helicity nonconservation for diffractive vector mesons (2003)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W.
As Glauber has shown in 1959, the spin-flip phenomena caused by the conventional spin-orbit interaction do vanish in the scattering off heavy, strongly absorbing nuclei. On the other hand, the origin...
Nonlinear kT factorization for Forward Dijets in DIS off Nuclei in the Saturation Regime (2003)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We develop the QCD description of the breakup of photons into forward dijets in small-x deep inelastic scattering off nuclei in the saturation regime. Based on the color dipole approach, we derive a...
Spin dynamics and spin disorder in frustrated TbCoxNi1-xC2 (2003)
Kalvius, G M, Noakes, D R, Wappling, R, Grosse, G, Schäfer, W, Kockelmann, W, ...
Magnetic behaviour of YFexAl12-x (2003)
Kalvius, G M, Wagner, F E, Noakes, D R, Schreier, E, Wappling, R, Zimmermann, U, ...
New results on high-field transport in semiconductor superlattices (2003)
Holfeld,C.P., Rosam,B., Meinhold,D., Glutsch,S., Schäfer,W., Zhang,J., ...
New results on high-field transport in semiconductor superlattices (2003)
Holfeld, C.P., Rosam, B., Meinhold, D., Glutsch, S., Schäfer, W., Zhang, J., ...
The optical properties of an electrically biased semiconductor superlattice are strongly influenced by coupling to other bands. As these coupling mechanisms depend on the strength of the applied...
Pro-micron: Auftrag und Dienstleistung einer neuen Einrichtung (2003)
Auftrag des im Oktober 2002 gegründeten Unternehmens pro-micron GmbH & Co.KG modular systems ist die Umsetzung des Projektes Technologieoffensive Allgäu. Ziel dieses Projektes ist die Etablierung...
New results on high-field transport in semiconductor superlattices (2003)
Holfeld, C.P., Rosam, B., Meinhold, D., Glutsch, S., Schäfer, W., Zhang, J., ...
High Density QCD, Saturation and Diffractive DIS (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review a consistent description of the fusion and saturation of partons in the Lorentz-contracted ultrarelativistic nuclei in terms of a nuclear attenuation of color dipole states of the photon...
Lectures on Diffraction and Saturation of Nuclear Partons in DIS off Heavy Nuclei (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
The Lorentz contraction of ultrarelativistic nuclei entails a spatial overlap and fusion (recombination, saturation) of partons belonging to different nucleons at the same impact parameter. In these...
High Density QCD and Saturation of Nuclear Partons (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We review the recent finding of the two-plateau momentum distribution of sea quarks in deep inelastic scattering off nuclei in the saturation regime. The diffractive plateau which dominates for small...
Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity? (2002)
Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
We derive the two-plateau momentum distribution of final state (FS) quarks produced in deep inelastic scattering (DIS) off nuclei in the saturation regime. The diffractive plateau which dominates for...
Diffractive Hard Dijets and Nuclear Parton Distributions (2002)
Ivanov, I. P., Nikolaev, N. N., Schäfer, W., Zakharov, B. G., Zoller, V. R.
Diffraction plays an exceptional role in DIS off heavy nuclei. First, diffraction into hard dijets is an unique probe of the unintegrated glue in the target. Second, because diffraction makes 50 per...
Vector Condensation at Large Chemical Potential (2002)
We discuss the condensation of relativistic spin-one fields at high chemical potential. This phenomenon leads to the spontaneous breaking of rotational invariance, together with the breaking of...
Partial Deconfinement in Color Superconductivity (2002)
Sannino, F., Marchal, N., Schäfer, W.
We analyze the fate of the unbroken SU(2) color gauge interactions for 2 light flavors color superconductivity at non zero temperature. Using a simple model we compute the deconfining/confining...
A field mill based on the modular MEMs framework Match-X (2002)
Matuscheck, P., Evers, J., Schäfer, W., Nienhaus, M., Kleen, S.
This paper presents a miniaturised field mill based on the modular MEMS framework Match-X. The field mill will be used for the measurement of the electrostatic field strength of charged surfaces e.g....
Zimmer, K., Jam, A.K., Schäfer, W.
Mitglieder des industriellen Lenkungsausschusses im wissenschaftlichen Vorprojekt "Mikrosystemtechnik im Maschinen- und Anlagenbau" (BMBF-Vorhaben im Förderprogramm Mikrosystemtechnik) gründeten...
Lövenich, J. H. R., Lai, C. W., Hägele, D., Chemla, D. S., Schäfer, W.
This version is available at the following Publisher URL: http://prb.aps.org
Zimmer, K., Jam, A.K., Schäfer, W.
Mitglieder des industriellen Lenkungsausschusses im wissenschaftlichen Vorprojekt "Mikrosystemtechnik im Maschinen- und Anlagenbau" (BMBF-Vorhaben im Förderprogramm Mikrosystemtechnik)...
Modulare Mikrosysteme als Basis für fluidische Analysesysteme (2001)
Schüle, A., Bauer, G., Schäfer, W.
Zur Realisierung vom Markt geforderten flexibel einsetzbaren Analyseverfahren in kostengünstigen, miniaturisierten, einfach zu bedienenden Geräten bietet sich eine modulare Struktur an. Modular...
Modulare Mikrosysteme: Ein Beispiel aus der medizinischen Analytik (2001)
Schüle, A., Bauer, G., Schäfer, W.
Analytical systems for Point-of-Care use show medical, technical and economical advantages especially in emergency diagnostic issues and so promise a high market potential. For the realization of...
Die Automatisierungstechnik fordert miniaturisierte Systeme (2001)
Maschinen und Produktionsanlagen werden laufend im Hinblick auf eine höhere Leistungsfähigkeit, verbesserte Qualitätsmerkmale und eine kostengünstigere Fertigung optimiert. Die Automatisierung...
Coherent production of hard dijets on nuclei in QCD (2001)
Nikolaev, E. D., Schäfer, W., Schwiete, G.
This version is available at the following Publisher URL: http://prd.aps.org
Szczurek, A., Nikolaev, N. N., Schäfer, W., Speth, J.
We discuss how the dijet azimuthal correlations in DIS and real photoproduction at HERA probe the differential (unintegrated) gluon distribution in the proton. We find a strong dependence of the...
Coherent production of hard dijets on nuclei in QCD (2000)
Nikolaev, N. N., Schäfer, W., Schwiete, G.
We formulate the perturbative QCD approach to coherent diffractive dijet production in pion-nucleon and pion-nucleus collisions at high energy. For hard dijets the Pomeron splitting mechanism in...
Magnetism of crystalline and nanostructured ZnFe2O4 (2000)
Burghart, F J, Potzel, W, Kalvius, G M, Schreier, E, Frosse, G, Noakes, D R, ...
Präzisionsreinigung von Mikrostrukturen mittels UV-Laser (2000)
Rochowicz, M., Grimme, R., Schäfer, W.
Neben den bekannten Anwendungen der Lasertechnik zur Materialbearbeitung, zur Datenübertragung und in der Messtechnik bietet sich der Laser auch als Werkzeug für die Reinigung an. Für kleinste und...
Fertigungsautomatisierung für die Direktmontage (2000)
Sturm, R., Matuscheck, P., Frauenhoffer, F., Schäfer, W., Schilde, B.
Das Fraunhofer IPA hat im Rahmen eines strategischen Eigenforschungsprojektes eine Methodik entwickelt, mit der sich eine COB (Chip on Board)-Fertigung in Kombination mit einer SMT (Surface Mount...
Advanced modular production concept for miniaturized products (2000)
Gaugel, T., Dobler, H., Rohrmoser, B., Klenk, J., Schäfer, W.
Microsystem technology and miniaturization are becoming increasingly important in the automotive and capital goods industries, communication and medical device technologies, and the fields of life...
Modularized Microelectromechanical Systems (2000)
Bauer, G., Schünemann, M., Schäfer, W., Großer, V., Leutenbauer, R.
A modular MEMS packaging and interface concept for custom-designed MEMS in mid-scale volumes was developed. Modular units include functional components, e.g. sensors, microactuators or signal...
Microproduction Trends in Product Design - Effects on Production (2000)
The market for microsystems is characterized by a demand for customized products with an associated multitude of variants with low piece numbers. To reduce the high production costs arising from...
MEMS Modular Packaging and Interfaces (2000)
Schünemann, M., Jam, A.K., Großer, V., Leutenbauer, R., Bauer, G., Schäfer, W., ...
Many industrial branches other than automotive industry may benefit from MEMS technology. Most of them require custom-designed MEMS in mid-scale volumes, which are at present not available at...
Die Notwendigkeit von Innovationen in Produktionsmaschinen und Anlagen zur Sicherung des Wettbewerbsvorteils erfordert ein hohes Engagement in der Forschung und Entwicklung. Die Entwicklung von...
Defocusing Correction of X-Ray Pole Figures by Means of Neutron Pole Figure Measurement (2000)
H. Siemes, C. A. Rosière, P. Hackspacher, W. Schäfer, E. Jansen
A rather simple empirical defocusing correction method is described which makes use of X-ray and neutron measurement of pole figure data from a sample with a weak preferred orientation.
Nonperturbative effects in the proton sea (1999)
We revisit the evaluation of the pionic mechanism of the $\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is based on the unitarity relation between contributions of...
Ivanov, I. P., Nikolaev, N. N., Pronyaev, A. V., Schäfer, W.
We derive a unitarity relationship between the spin structure function $g_{LT}(x,Q^{2})=g_{1}(x,Q^{2})+g_{2}(x,Q^{2})$, the LT interference diffractive structure function and the spin-flip coupling...
Usage of Two-Directional Link Techniques for Determination of Satellite State for GNSS-2 (1999)
Hammesfahr, J., Hornbostel, A., Hahn, J., Trautenberg, H., Rapp, C., Specht, W., ...
Die Ergebnisse einer Studie zur Verbesserung des Satelliten-Zustandsvektors einschließlich Position, Zeit und Integrität werden zusammengefasst. Simulationsergebnisse bezüglich der Verbesserung 1)...
Mechanische Schnittstellen des modularen Baukastensystems für Mikrosysteme (1999)
Bauer, G., Schünemann, M., Schäfer, W., Krause, W., Gerstenberger, R., ...
Vorgestellt werden Lösungsansätze für die Standardisierung der mechanischen Schnittstellen des modularen Baukastensystem für Mikrosysteme. Im Gegensatz zu den elektrischen, optischen und...
Kennzeichnung und Identifikation von Mikrosystemen (1999)
Matuscheck, P., Stock, A., Grimme, R., Schünemann, M., Schäfer, W.
Die Identifikation von Komponenten, Bauteilen und Systemen gewinnt in der Mikroproduktion / Mikrosystemtechnik unter dem Aspekt der (teil-)automatisierten Fertigung immer mehr an Bedeutung. Gründe...
Flexibles multifunktionales Montagesystem für die Feinwerk- und Mikrotechnik (1999)
Schlenker, D., Bauer, G., Stock, A., Schäfer, W.
Vorgestellt wird ein innovatives Werkzeugsystem mit Wechseleinrichtung zur Adaption unterschiedlichster Werkzeuge, den Anforderungen und den Besonderheiten der industriellen Montage von hybriden...
Miniaturisierung von Baugruppen in Produktionsanlagen (1999)
Das Rahmenkonzept "Forschung für die Produktion von morgen" des Bundesministeriums für Bildung und Forschung (BMBF) wird vom Forschungszentrum Karslruhe GmbH, Projektträgerschaft Produktion und...
Schünemann, M., Grosser, V., Leutenbauer, R., Bauer, G., Schäfer, W., Reichl, H.
A highly flexible modular design and production framework for microelectromechanical systems, suitable for midscale production at reasonable costs is introduced. The modular framework consists of a...
Flexibles Montagesystem für die Feinwerk- und Mikrotechnik (1999)
Bauer, G., Schlenker, D., Stock, A., Schünemann, M., Schäfer, W.
Mikrosystemen wird ein großes Potential vorausgesagt, doch bei ihrer Herstellung ist die niedrige Automatisierung noch ein großes Hemmnis. Deshalb sind Werkzeugsysteme gefordert, die flexibel an...
Automatisierte Montage und Justage von Mikrokomponenten (1999)
Schünemann, M., Grimme, R., Schlenker, D., Stock, A., Schäfer, W., ...
Hybrid aufgebaute Mikrosysteme und Mikrokomponenten haben das Potential, die Entwicklung innovativer und intelligenter Produkte in unterschiedlichsten Branchen zu ermöglichen und zu unterstützen....
Angepasste Reinheitstechnik in der Elektronikfertigung (1999)
Matuscheck, P., Gaugel, T., Schließer, J., Schäfer, W.
Der Artikel geht auf die Reinheitsanforderungen bei der Herstellung von Produkten in der Elektronikfertigung ein. Es werden die Anforderungen der Produkte an eine Reinheitsumgebung dargestellt....
Miniaturisierung von Baugruppen in Produktionsanlagen. (1999)
Werkstattstechnik - Forschung und Entwicklung für die Produktion, 89(1999) S.515
Produktionskonzepte für die Mikrotechnik (1998)
Westkämper, E., Schünemann, M., Schlenker, D., Bauer, G., Grimme, R., Schäfer, W.
Die Überführung von mikrosystemtechnischen Prototypen in industriell gefertigte und am Markt erfolgreiche Produkte stellt heute noch oftmals ein Problem dar. Insbesondere Mikrokomponenten in...
Gramann, U., Frauenhoffer, F., Sturm, R., Matuscheck, P., Suntrup, M., Kaufmann, T.S., ...
During the last years, especially in Europe, tendencies towards small lot production, multiple product variations of electronic products and hybrid microsystems with high quality and reliability can...
Modularization of Microsystems and Standardization of Interfaces (1998)
Schünemann, M., Bauer, G., Schäfer, W., Leutenbauer, R., Grosser, V., Reichl, H.
Smart sensors, actuators and control systems fitting into distributed control architectures have been identified as the main applications of microelectromechanical systems in industrial areas like...
Modulare Mikrosysteme für kleine und mittlere Stückzahlen (1998)
Schünemann, M., Bauer, G., Schäfer, W., Großer, V., Leutenbauer, R.
Es wurde ein Baukastensystem für die Realisierung von modularen Mikrosystemen, ausgerichtet auf die Anforderungen des Maschinen- und Anlagenbaus, konzipiert. Die dazu notwendige Aufbau- und...
Bauer, G., Schünemann, M., Schlenker, D., Schäfer, W.
Es wird ein flexibles Werkzeug mit Justagehilfen und integriertem Werkzeugwechselsystem vorgestellt. Einsatzfelder für das System sind die industrielle Aufbau- und Verbindungstechnik, besonders die...
A Micro-fab for the Micro-assembly of Optical Lenses (1998)
Schäfer, W., Grimme, R., Schlenker, D., Stock, A., Schünemann, M.
This article describes integrating the micro-assembly of small lens systems into an automated micro-fab. The micro-fab consists of a cleaning and inspection cluster, an assembly and hardening...
A Micro-fab for the Micro-assembly of Optical Lenses (1998)
Schäfer, W., Grimme, R., Schlenker, D., Stock, A., Schünemann, M.
This article describes integrating the micro-assembly of small lens systems into an automated micro-fab. The micro-fab consists of a cleaning and inspection cluster, an assembly and hardening...
Local laser supported cleaning of microelectromechanical systems and components (1998)
Schwaab, G., Grimme, R., Rockowicz, M., Schäfer, W.
The requirements for cleaning technology, e.g. local restrictability, ecological benefit and cleaning of even sub-µm particles, are risen up enormously in the last few years at the production of...
Local laser supported cleaning of microelectromechanical systems and components (1998)
Schwaab, G., Grimme, R., Schäfer, W.
The requirements for cleaning technology, e.g. local restrictability, ecological benefit and cleaning of even sub-µm particles, are risen up enormously in the last few years at the production of...
Industrielle Produktion von Endoskopen (1998)
Schäfer, W., Schlenker, D., Stock, A., Rothmaier, U.
Verbunden mit dem zunehmenden Übergang zur Minimal Invasiven Chirugie (MIC) und dem verstärkten Einsatz der Endoskopie in industriellen Anwendungsfeldern steigt der Bedarf an dünnkalibrigen...
Industrielle Produktion von Endoskopen (1998)
Rothmaier, U., Schäfer, W., Schlenker, D., Stock, A.
Verbunden mit dem zunehmenden Übergang zur Minimal Invasiven Chirugie (MIC) und dem verstärkten Einsatz der Endoskopie in industriellen Anwendungsfeldern steigt der Bedarf an dünnkalibrigen...
Schünemann, M., Grosser, V., Leutenbauer, R., Bauer, G., Schäfer, W., Reichl, H.
A highly flexible modular design and production framework for microelectromechanical systems, suitable for midscale production at reasonable costs is introduced. The modular framework consists of a...
Krabe, D., Dümcke, R., Reichl, H., Wächter, C., Schreiber, P., Karthe, W., ...
Optical microsystems usually are of a hybrid nature. They consist of optical components, i.e. microoptical and or integrated-optical ones, and additionally they include at least mechanical and...
Design and Application of Modular Microsystems (1998)
Schünemann, M., Bauer, G., Schäfer, W., Leutenbauer, R., Grosser, V., Zoeppig, V.
A highly flexible modular design and production framework for microsystems, suitable for mid-scale production at reasonable costs, was developed. Packaging and assembly of micromodules are discussed....
Schünemann, M., Bauer, G., Schäfer, W., Reichl, H., Großer, V., Leutenbauer, R.
Es wurde ein Baukastensystem für die Realisierung modularer Mikrosysteme, ausgerichtet auf die Forderungen des Maschinen- und Anlagenbaus, konzipiert. Die dazu notwendige Aufbau- und...
Pole Figures From Time-of-Flight Measurements Using Neutrons of a Pulsed Spallation Source (1998)
E. Jansen, W. Schäfer, G. Will
A new method of pole figure scanning is described, where the number of different sample orientations can be reduced by about one order of magnitude compared to the conventional scanning procedure...
Reinigung und Inspektion von optischen Bauteilen (1997)
Stock, A., Dettmann, H., Schäfer, W., Rothmaier, U.
Es werden Verfahren zur automatischen Reinigung und Inspektion miniaturisierter optischer Komponenten vorgestellt und die Realisierung eines Inspektionsgerätes eingehend beschrieben. Dabei werden...
Gramann, U., Stock, A., Clauß, S., Schäfer, W.
Die Produktion von High-Tech-Produkten wie Hochfrequenzmodule auf der Basis von Mikro/Millimeterwellenkomponenten erfordert zuverlässige, stabile Prozesse und Fertigungsabläufe. Eine gezielte...
Optical microsystems. Packaging strategy by design and modelling (1997)
Schreiber, P., Wächter, C., Karthe, W., Krabe, D., Reichl, H., Elbers, J.P., ...
A new way to select proper packaging strategies for optical microsystems by means of design and modelling is presented. A specification environment takes into account the hybrid nature of...
Schünemann, M., Grosser, V., Leutenbauer, R., Matuscheck, P., Schäfer, W., Reichl, H.
A highly flexible, modular design and production framework for microelectromechanical systems, suitable for mid-scale production at reasonable costs, is presented. The modular framework, similar to...
Modular magazine for the suitable handling of microparts in industry (1997)
Grimme, R., Schmutz, W., Schlenker, D., Schünemann, M., Stock, A., Schäfer, W.
Microassembly and microadjustment techniques are key technologies in the industrial production of hybrid microelectromechanical systems. One focal point in current microproduction research and...
Jeremias, M., Michel, F., Schäfer, W.
Mikrosysteme der Hochfrequenztechnik erlangen zunehmend Bedeutung in der Kommunikations-, Radar- und Sensortechnik. Sowohl bei der fertigungsgerechten Gestaltung der Komponenten, den Montageprozessen...
Schünemann, M., Grimme, R., Kaufmann, T.S., Schwaab, G., Bader, U., Schäfer, W., ...
During the past few years, remarkable afforts have been made for the ralization of microscale sensors, actuators and microelectromechanical systems. Due to advances in solid state and micromachining...
Industrialisierung der Fertigungstechnik für Mikrosysteme (1997)
Westkämper, E., Schünemann, M., Schlenker, D., Grimme, R., Schäfer, W.
Wesentliche Hemmnisse bei der Überführung von mikrosystemtechnischen Prototypen in industriell gefertigte und am Markt erfolgreiche Produkte bestehen in der Nichtverfügbarkeit von...
Fertigungstechnologien fehlen noch: Mikroproduktionstechniken auf dem Vormarsch (1997)
Schäfer, W., Fischer, G., Vögele, G., Weisener, T.
Die industrielle Produktion von Mikrosystemen steckt in den Anfängen. Heute werden aber bereits "Minisysteme" industriell gefertigt. Für derartige Produkte sind mit dem Markteintritt der nächsten...
Design and modelling of optical microsystems (1997)
Schreiber, P., Wächter, C., Karthe, W., Krabe, D., Dümcke, R., Reichl, H., ...
Optical microsystems consist of micro-optical, integrated-optical, mechanical and packaging components. Due to the hybrid nature and the high complexity of these microsystems a general design...
Reinigung von Mikrosystemen und Mikrokomponenten (1996)
Grimme, R., Schwaab, G., Schäfer, W.
Die industrielle Produktion von hybriden Kleinst- und Mikrosystemen stellt neue Anforderungen an die Reinigungstechnik. Die Einzelkomponenten hybrider Mikrosysteme, selbst komplexe multifunktionale...
Prism = Methodology + process-oriented environment (1996)
Deiters, W., Madhavji, N.H., Gruhn, V., Schäfer, W.
Prism is an experimental-process-oriented environment, supporting methodical development, instantiation, and execution of software process models. This paper describes the Prism model and an...
Nonlinear optical studies of Bloch oscillations (1996)
Leisching, P., Beck, W., Kurz, H., Köhler, K., Schäfer, W., Leo, K.
We have investigated the coherent dynamics of wave packets in semiconductor superlattices with an applied electric field. In particular, we have performed four-wave mixing experiments with...
New Cleanroom and Cleanliness Concepts for Microsystem Production (1996)
Dorner, J., Grimme, R., Schünemann, M., Schließer, J., Kaufmann, T.S., Schäfer, W.
The cleanroom production technology offers different ways from Ballroom concept to minienvironment and clean machines. There is an increasing trend to regard this technology from the point of the...
Modulares Gerätekonzept zur Mikrolinsenmontage (1996)
Grimme, R., Schlenker, D., Stock, A., Schäfer, W.
Die Fertigung endoskopischer Linsensysteme basiert derzeit im wesentlichen auf manuellen Fertigungsschritten. Hierdurch wird die erreichbare Qualität und die mögliche Produktivität in Grenzen...
Inspektionsmodul zur Prüfung optischer Bauteile (1996)
Stock, A., Grimme, R., Schlenker, D., Dettmann, H., Schäfer, W.
Das vorgestellte Inspektionsmodul ist in der Lage, eine automatische Fehlererkennung und Fehlerklassifizierung durchzuführen. Dadurch ist eine Qualitätssicherung der Produkte und eine ständige...
Innovationspotentiale im Maschinenbau durch die Mikrosystemtechnik (1996)
Schünemann, M., Schäfer, W., Schließer, J., Gehringer, H.
Der Maschinen- und Anlagenbau behauptet seine Marktposition durch Innovationen. Durch den Einsatz von Mikrosystemen kann ein wesentlicher Beitrag zu Innovationen im Maschinen- und Anlagenbau...
Halbautomat zur Montage von miniaturisierten optischen Systemen (1996)
Schlenker, D., Grimme, R., Stock, A., Schäfer, W.
Durch die Entwicklung und Realisierung der beschriebenen Montageanlage wird es möglich, die derzeit manuell gefertigten optischen Übertragungselemente reproduzierbar herzustellen und somit eine...
Grundlagen zur Justage von Einzellinsen (1996)
Schäfer, W., Schlenker, D., Grimme, R., Stock, A., Rochowitz, M.
Fertigungskonzepte für die industrielle Produktion von Mikrosystemen (MikroFAB) (1996)
Grimme, R., Schünemann, M., Schwaab, G., Kaufmann, T.S., Bader, U., Schlenker, D., ...
Schäfer, W., Shah, J., Damen, T.C., Cunningham, J.E., Goossen, K.W., ...
We present a unified microscopic approach to four-wave mixing (FWM) in semiconductors on an ultrashort time scale. The theory is valid for resonant excitation in the vicinity of the excitonic...
Entwicklungstrends in der industriellen Produktion von Mikrosystemen (1996)
Grimme, R., Schünemann, M., Großer, V., Reichl, H., Schäfer, W., Schwaab, G.
Ein wesentliches Hemmnis in der Überführung von mikrosystemtechnischen Prototypen in industriell gefertigte und am Markt erfolgreiche Produkte besteht in der Nichtverfügbarkeit von...
Grimme, R., Schünemann, M., Schließer, J., Kaufmann, T.S., Schäfer, W.
During the past few years, remarkable efforts have been made in the field of microscale sensors, actuators, and microelectromechanical systems. Due to advance in solid state and micromachining...
Grimme, R., Schünemann, M., Schließer, J., Kaufmann, T.S., Schäfer, W.
During the past few years, remarkable efforts have been made in the field of microscale sensors, actuators, and microelectromechanical systems. Due to advance in solid state and micromachining...
Chancen des Maschinenbaus durch die Mikrosystemtechnik (1996)
Schäfer, W., Schünemann, M., Schließer, J., Gehringer, H.
- Der Maschinenbau hat für die deutsche Wirtschaft eine wesentliche Bedeutung. - Innovationen durch Mikrosystemeinsatz sehen insbesondere Hersteller von Maschinenkomponenten. - Nutzung von...
E. Jansen, W. Schäfer, W. Kockelmann, G. Will
The continuous wavelength spectrum available at pulsed neutron sources and the use of a position sensitive detector can drastically reduce the number of sample orientations during pole figure...
Mitchell, D.W., Das, T.P., Potzel, W., Schiessl, W., Karzel, H., Steiner, M., ...
Physical Review B, 53(1996) S.7684-98
Magnetic properties of the ZnFe§2O§4 spinel. (1996)
Schiessl, W., Potzel, W., Karzel, H., Steiner, M., Kalvius, G.M., Martin, A., ...
Physical Review B, 53(1996) S.9143-52
Potzel, W., Kalvius, G.M., Schiessl, W., Karzel, H., Steiner, M., Kratzer, A., ...
Hyperfine Interactions, 97/98(1996) S.373-86
Vey, M, Schäfer, W, Ayoubi, T A, Klenk, H D, ...
The trans-Golgi network (TGN) proprotein convertase furin is synthesized in a zymogenic form and is activated by intramolecular, autoproteolytic cleavage of the propeptide from its precursor. To...
Development Trends in the Industrial Production of Microsystems (1995)
Schäfer, W., Schuenemann, M., Grimme, R., Grosser, V.
During the past few yers, remarkable affords have been made for the realization of microscale systems and devices. Whereas, due to advances in solid state and microsystem technologies, significant...
Aufholbedarf beim Mittelstand: Produktionstechnik für Mikrosysteme (1995)
Seit einigen Jahren setzen sich Mikrosysteme dort durch, wo hohe Stückzahlen oder hohe Wertschöpfung Gewinn versprechen, beispielsweise in der Automobilindustrie oder in der Medizintechnik....
Electronic structure of Zn in oxide spinels. (1995)
Schiessl, W., Potzel, W., Karzel, H., Steiner, M., Köfferlein, M., Kalvius, G.M., ...
Hyperfine Interactions, 90(1994) S.359-64
Die Industrielle Produktion von Mikrosystemen steckt noch in den Anfängen. Allerdings werden heute bereits "Minisysteme" wie beispielsweise Endoskope, Räderwerke für Uhren, Mikrophone und...
Trends in the Industrial Production of MST (1994)
In order to compete successfully, manufacturers of sensors and actuators will have to substitute conventional technology with microsystem technologies in the industrial production of the future. The...
Perspektiven der Fertigungsgeräte-Industrie in der industriellen Produktion von Mikrosystemen (1994)
Schäfer, W., Schweizer, M., Dorner, J., Weisener, T., Vögele, G.
Die industrielle Produktion von Mikrosystemen steckt in den Anfängen. Allerdings werden heute bereits "Minisysteme" wie beispielsweise Endoskope, Räderwerke für Uhren, Mikrophone oder mechanische...
Shah, J., Damen, T.C., Schäfer, W., Pfeiffer, L.N., Köhler, K.
We show the existence of an instantaneous contribution to the time-resolved four-wave mixing (FWM) from GaAs quantum wells near zero time delay ( T = 0), which is very sensitive to the excitation...
Merlin: Supporting Cooperation in Software Development through a Knowledge-based Environment (1994)
G. Junkermann, B. Peuschel, W. Schäfer, S. Wolf
This paper describes the main concepts behind the implementation of the Merlin prototype and sketches current and further work within the research project evolving from the current experience with...
Merlin : Supporting Cooperation in Software Development through a Knowledge-based Environment (1994)
Schlüsselkomponenten der Forschungsinstanz der EUREKA Software Factory (1993)
Deiters, W., Fehling, R., Gruhn, V., Schäfer, W.
In diesem Papier werden zwei ausgewählte Ansätze, die grundlegende Komponenten der Forschungsinstanz der EUREKA Software Factory darstellen, beschrieben. Bei diesen Ansätzen handelt es sich um den...
Zeichnen sich für Hersteller von Fertigungsgeräten, die bislang die Chip-Produktion belieferten, zusätzliche artverwandte, innovative Märkte ab? Diese Frage stand am Beginn eines...
Bacteriochlorophylls with modified central metals in bacterial reaction centers (1993)
Hartwich, G., Katheder, Ingrid, Cmiel, Edmund, Schäfer, W., Fiedor, L., Scherz, A., ...
Porra, R. J., Schäfer, W., Cmiel, Edmund, Katheder, Ingrid, Scheer, Hugo
Using mass spectroscopy, we demonstrate as much as 93% enrichment of the 7-formyl group oxygen of chlorophyll b when dark-grown, etiolated maize leaves are greened under white light in the presence...
Bacterial reaction centers with modified chromophores (1993)
Scheer, Hugo, Cmiel, Edmund, Fischer, M., Göbel, A., Hartwich, G., Meyer, M., ...
Comparison of Results of Texture Measurements Obtained by X-Ray and by Neutron Diffraction (1993)
O. Engler, J. Palacios, W. Schäfer, E. Jansen, K. Lücke, G. Will
Texture measurements were carried out on 95% cold rolled and also on recrystallized high purity copper sheets by means of X-ray and neutron diffraction. The purpose of this study was to compare the...
Schäfer, W., Jahnke, F., Damen, T.C., Köhler, K., Schmitt-Rink, S., ...
Four-wave-mixing signals from excitions in high-quality GaAs quantum wells show an unusually slow temporal evolution, in stark contrast to the behavior expected for a noninteracting two-level system....
Spezifikationen von Reinraum-Monitoring-Systemen (1992)
In Fertigungen im Reinraumbereich gewinnt die Überwachung der Prozeßparameter und Umgebungsbedingungen, wie z.B. die Partikelkontamination durch ständig wachsende Anforderungen mehr und mehr an...
Quantum beats of excitons in quantum wells (1992)
Schmitt-Rink, S., Damen, T., Göbel, E.O., Köhler, K., Leo, K., Schäfer, W., ...
We review our observations of quantum beats of excitons in quantum wells arising from (i) heavy hole-light hole splitting, (ii) exciton splitting due to fluctuations in the well-width of quantum...
Experiences with workcell integration. (1992)
Scope of the lecture is to report about the special experiences made in two projects. The lecture compares briefly costs and quality of the systems and reports about the reasons for the differences....
Dissipative dynamics of an electronic wavepacket in a semiconductor double well potential. (1992)
Schulze, A., Meier, T., Thomas, P., Luo, M.S.C., Schäfer, W., Chuang, S.L., ...
We present a detailed study of coherent tunneling oscillations of an optically excited electronic wavepacket in a semiconductor double quantum-well structure. The oscillation of the wavepacket...
Bacteriochlorophylls modified at position C-3 (1992)
Struck, A., Cmiel, Edmund, Katheder, Ingrid, Schäfer, W., Scheer, Hugo
[3-Vinyl]-bacteriochlorophyll a and related pigments modified at C-3 and/or C-132 have been synthesized from bacteriochlorophyll a. The reactivity at C-3 is strongly influenced by the C-132...
The PROMETHEUS 60-GHz Channel - Fading Statistics and Simulated Packet Error Rates (1991)
Bischl, H., Schäfer, W., Lutz, E.
Measured channel data of the PROMETHEUS 60-GHz channel cover measurements on highways, rural roads and in urban surroundings for distances up to 500 m. Fading statistics concerning the duration of...
Channel Modelling of Short-Range Radio Links at 60 GHz for Mobile Intervehicle Communication. (1991)
For mobile intervehicle communication links the use of microwaves has some advantages, for example the small system elements. Within the European PROMETHEUS research program the DLR has the task to...
Assessment of Frequencies for Prometheus and Drive - The 60 GHz Mobile Radio Channel. (1991)
Several possible frequency bands are discussed for application in PROMETHEUS and DRIVE short- and medium-range communications. This paper considers the following frequencies: 900 MHz, 2.5 GHz, 6 GHz,...
Der vorliegende Bericht stellt die wesentlichen Ergebnisse der statistischen auswertung der Funkkanalmessungen vor, welche im Rahmen des Projektes PROMENTHEUS durchgeführt wurden. Ziel der Messungen...
Subpicosecond four-wave mixing in GaAs/Al(x)Ga(1-x)As quantum wells (1991)
Leo, K., Shah, J., Schmitt-Rink, S., Schäfer, W., Müller, J.F., Damen, T.C., ...
We investigate the properties of coherent exciton states in GaAs/AlxGa1-xAs quantum wells using the four-wave-mixing technique with subpicosecond time resolution. In the first part of this work, we...
Je kürzer die Innovationszyklen bei den Produktionsmitteln desto weniger kommen die Fabrikorganisatoren dazu, die Leitstände zu optimieren. Denn beim Austausch eines Fertigungsgerätes muß allzu...
Resonant tunneling in double quantum wells - the cases of strong and weak collisions. (1991)
Leo, K., Shah, J., Schmitt-Rink, S., Schäfer, W., Damen, T.C., Göbel, E.O., ...
Quantum beats of excitons in quantum wells (1991)
Leo, K., Shah, J., Schmitt-Rink, S., Schäfer, W., Müller, J.F., Köhler, K., ...
We briefly review or recent observations of quantum beats of excitons in quantum wells. The quantum beats are observed as an oscillatory structure in the polarization decay of energetically closely...
Prüfzelle zur Ermittlung von Partikelkontamination (1991)
Für die automatisierte Meßdatenverarbeitung beim Einsatz von Partikelzählern gab es bislang für viele Anwendungen noch keine ausreichende Lösung. Am Fraunhofer-Institut für Produktionstechnik...
Im Vergleich zu anderen Fertigungs-Branchen weist die Automatisierung in der Chip-Produktion heute immer noch ein hohes Entwicklungspotential auf. Immer kürzere Innovationszyklen hemmen eher die...
Entwicklung von Zellenrechnern für die Halbleiterfertigung (1991)
In der Halbleiterfertigung besteht zunehmend die Tendenz zur Bildung von Subsystemen zu sogenannten Zellen. Die Zellen können dabei aus gleichartigen Fertigungsgeräten z.B. im Ofenbereich oder aber...
Datenerfassung - Monitoring (1991)
Der vorliegende Beitrag stellt die Konzeption und Realisierung eines Meßdatenerfassungs- und Auswertesystems für Partikelmeßdaten vor. Das System wird im Fraunhofer-Institut für...
Coherent oscillations of a wave packet in a semiconductor double-quantum-well structure (1991)
Damen, T.C., Göbel, E.O., Köhler, K., Leo, K., Schäfer, W., Schmitt-Rink, S., ...
We present the first observation of the spatial dynamics of a wavepacket in a solid. Using an ultrashort laser pulse, we create an excitonic wavepacket in one well of an asymmetric double quantum...
Advanced work cell concept (1991)
Description of an advanced work cell concept. The concept is realized at the test-center of FhG-IPA. A new aspect is the usage of an integration platform.
W. Schäfer, P. Merz, E. Jansen, G. Will
Diffraction patterns of multiphase and low-symmetry materials are characterized by a manifold of reflections with high peak overlap, hindering individual pole figure measurements by conventional...
Ausbreitungseffekte fuer 60-GHz-Kurzstrecken-Funkverbindungen zwischen Fahrzeugen. (1990)
Bei der Fahrzeug-Fahrzeug-Kommunikation bietet die Verwendung von Mikrowellen Vorteile, z. B. die geringe Baugroesse der Systemkomponenten. Die Ausbreitungsbedingungen bei 60 GHz fuer diesen...
Quantum beats from extended electronic states in quantum wells (1990)
Müller, J.F., Schmitt-Rink, S., Schäfer, W., Damen, T.C., Ganser, P., Göbel, E.O., ...
We study the polarization decay of excitons in GaAs/AlGaAs quantum wells using timeresolved degenerate-four-wave-mixing (DFWM) with subpicosecond time resolution. The coherent excitation of two...
Für die automatisierte Meßdatenverarbeitung beim Einsatz von Partikelzählern gab es bislang für viele Anwendungen noch keine ausreichende Lösung. Am Fraunhofer-Institut für Produktionstechnik...
Femtosecond transient-grating experiments in quantum wells (1990)
Schmitt-Rink, S., Müller, J.F., Damen, T.C., Ganser, P., Göbel, E.O., Köhler, K., ...
Using degenerate four-wave mixing (DFWM) with subpicosecond timeresolution, we demonstrate the following phenomena: (I) a novel coherent interaction of excitonic polarizations and (II) quantum beats...
Die Überwachung der Partikelkontamination in Fertigungen im Reinraumbereich gewinnt durch ständig wachsende Anforderungen mehr und mehr an Bedeutung. Den Anforderungen kann häufig nur eine...
Modified bacterial reaction centers (1990)
Struck, A., Beese, D., Cmiel, Edmund, Fischer, M., Müller, A., Schäfer, W., ...
F. Elf, W. Schäfer, S. Höfler, G. Will
The first low temperature texture investigation by neutron diffraction is presented. Pole figures are collected on a special full circle Eulerian cradle mounted completely inside a helium cryostat....
Texture Analysis by Neutron Diffraction Using a Linear Position Sensitive Detector (1989)
Neutron diffraction in connection with a position-sensitive detector is a most powerful technique in texture analysis comparable in time with conventional X-ray laboratory technique. Neutrons measure...
MAGNETIC FLUCTUATIONS IN THE COMPOUNDS YBa2CU3O6+x (0 < x < 1) (1988)
Brückel, Th., Neumann, K., Capellmann, H., Schärpf, O., Kemmler-Sack, S., Kiemel, R., ...
We performed neutron scattering experiments using polarization analysis on the high temperature superconductor YBa2Cu3O6.9 and the related semiconducting compounds YBa2Cu3O6+x (x = 0.11, 0.37). While...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Schäfer, W., Sieber, A., Hohmeyer, O.
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Systematic presentation of the clean air policy individual OECD member states. Synopsis (1988)
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
The knowledge about the special structures and basic ideas of the national policies on air pollution control constitutes the precondition for an international consensus on the policy on air...
Steinzerstörung mit dem KrF-Excimerlaser - Erste in vitro Ergebnisse (1988)
Friedrichs, R., Schäfer, W., Rübben, H., Poprawe, R.
Eine Lithotripsie ist experimentell und klinisch mit verschiedenen Lasersystemen möglich. Diese sind durch unterschiedliche Wellenlängen (lambda) gekennzeichnet: Neodym-YAG-Laser 1064 nm,...
A more effective method of in vitro urinary stone disintegration using the Nd-YAG-laser (1988)
Friedrichs, R., Poprawe, R., Schulze, W., Wehner, M., Schäfer, W., Rübben, H.
The first application of laser radiation for urinary stone disintegration has already been described in the 1960s. Meanwhile a variety of different laser systems have been described in vitro and have...
Laser fragmentation of urinary calculi. In vitro studies (1988)
Freidrichs, R., Kohnemann, R., Schäfer, W., Rübben, H., Poprawe, R.
Parameters for effective in vitro laser fragmentation of urinary calculi by the neodynium-YAG (Nd:YAG) laser and the KrF-Excimer laser are examined. The results of reflection measurement of urinary...
The Primary Structure of the HPI-Layer Polypeptide of Deinococcus radiodurans (1988)
Peters, J., Peters, M., Lottspeich, F., Schäfer, W., Cejka, Z., Baumeister, W.
MAGNETIC FLUCTUATIONS IN THE COMPOUNDS YBa2CU3O6+x (0 < x < 1) (1988)
Brückel, Th., Neumann, K., Capellmann, H., Schärpf, O., Kemmler-Sack, S., Kiemel, R., ...
We performed neutron scattering experiments using polarization analysis on the high temperature superconductor YBa2Cu3O6.9 and the related semiconducting compounds YBa2Cu3O6+x (x = 0.11, 0.37). While...
MAGNETIC FLUCTUATIONS IN THE COMPOUNDS YBa2CU3O6+x (0 < x < 1) (1988)
Brückel, Th., Neumann, K., Capellmann, H., Schärpf, O., Kemmler-Sack, S., Kiemel, R., ...
We performed neutron scattering experiments using polarization analysis on the high temperature superconductor YBa2Cu3O6.9 and the related semiconducting compounds YBa2Cu3O6+x (x = 0.11, 0.37). While...
W. Schäfer, S. Höfler, G. Will
Four different examples of neutron diffraction pole figure measurements are presented showing the variety of applications in metallic texture and microstructure analysis. Two examples are concerned...
Peters, J., Peters, M., Lottspeich, F., Schäfer, W., Baumeister, W.
The complete nucleotide sequence of the gene encoding the surface (hexagonally packed intermediate [HPI])-layer polypeptide of Deinococcus radiodurans Sark was determined and found to encode a...
STRUCTURE OF METHYLPHEOPHORBIDE-RCI (1986)
Scheer, Hugo, Gross, E., Nitsche, B., Cmiel, Edmund, Schneider, Siegfried, Schäfer, W.
he methanolic extract of the cyanobacterium (blue-green alga) Spirulina geitleri has been treated with methanolic acid to convert all chlorophyllous pigments to their methylpheophorbides....
Structure of a Chlorophyll-RC I. (1984)
Scheer, Hugo, Wieschhoff, H., Cmiel, Edmund, Nitsche, B., Schäfer, W., Schulten, H. R., ...
Drosophila evolution challenges postulated redundancy in the E(spl) gene complex.
Maier, D, Marte, B M, Schäfer, W, Yu, Y, Preiss, A
The Enhancer of split [E(spl)] gene complex belongs to the class of neurogenic loci, which, in a concerted action, govern neurogenesis in Drosophila. Two genetically distinct functions, vital and...
The free radical in pyruvate formate-lyase is located on glycine-734.
Wagner, A F, Frey, M, Neugebauer, F A, Schäfer, W, Knappe, J
Pyruvate formate-lyase (acetyl-CoA:formate C-acetyltransferase, EC 2.3.1.54) from anaerobic Escherichia coli cells converts pyruvate to acetyl-CoA and formate by a unique homolytic mechanism that...
Cutinase is not required for fungal pathogenicity on pea.
Cutinase, a fungal extracellular esterase, has been proposed to be crucial in the early events of plant infection by many pathogenic fungi. To test the long-standing hypothesis that cutinase of...
Hube, B, Sanglard, D, Odds, F C, Hess, D, Monod, M, Schäfer, W, ...
Secreted aspartyl proteinases (Saps), encoded by a gene family with at least nine members (SAP1 to SAP9), are one of the most discussed virulence factors produced by the human pathogen Candida...
Peters, J, Peters, M, Lottspeich, F, Schäfer, W, Baumeister, W
The complete nucleotide sequence of the gene encoding the surface (hexagonally packed intermediate [HPI])-layer polypeptide of Deinococcus radiodurans Sark was determined and found to encode a...
Deane, R, Schäfer, W, Zimmermann, H P, Mueller, L, Görlich, D, Prehn, S, ...
We report the identification and characterization of a novel 124-kDa Ran binding protein, RanBP5. This protein is related to importin-beta, the key mediator of nuclear localization signal...
Thiel, H J, Schwarz, H, Fischinger, P, Bolognesi, D, Schäfer, W
Previous studies have demonstrated that the onset of AKR leukemia could be dramatically delayed and the overall incidence significantly reduced following treatment with high-titered heterologous...
Role of carbohydrate in biological functions of Friend murine leukemia virus gp71.
Schäfer, W, Fischinger, P J, Collins, J J, Bolognesi, D P
Purified gp71 of Friend murine leukemia virus (FLV) can interfere with virus infection, absorb neutralizing antibody, and in the presence of group-specific anti-gp71 antibody, hemagglutinate sheep...
Bolognesi, D P, Collins, J J, Leis, J P, Moennig, V, Schäfer, W, Atkinson, P H
Treatment of Friend leukemia virus gp71 with protease-free glycosidase enzymes results in removal of the major portion of the carbohydrate without affecting the amount of protein present. The...
Schäfer, W, Stroh, A, Berghöfer, S, Seiler, J, Vey, M, Kruse, M L, ...
Furin, a subtilisin-like eukaryotic endoprotease, is responsible for proteolytic cleavage of cellular and viral proteins transported via the constitutive secretory pathway. Cleavage occurs at the...
T-DNA of a crown gall tumor is organized in nucleosomes
Schäfer, W., Weising, K., Kahl, G.
Nucleosomes were isolated from chromatin of suspension cultured cells of Nicotiana tabacum var. White Burley, which were either habituated or transformed by Agrobacterium tumefaciens, strain T37....
Calvete, J J, Mann, K, Schäfer, W, Sanz, L, Reinert, M, Nessau, S, ...
We report the complete amino acid sequence of HSP-1, a major protein isolated from stallion seminal plasma or acid extracts of ejaculated spermatozoa. The protein consists of 121 amino acids...
Calvete, J J, Mann, K, Schäfer, W, Fernandez-Lafuente, R, Guisán, J M
The human integrin glycoprotein (GP)IIb/IIIa plays a central role in haemostasis as an inducible receptor for fibrinogen and other RGD-containing adhesive proteins at the platelet plasma membrane....
Signal transduction in Halobacterium depends on fumarate.
Marwan, W, Schäfer, W, Oesterhelt, D
The isolation of a straight-swimming mutant of Halobacterium halobium is reported which has a defect in switching the rotational sense of its flagellar motor. Cells of this mutant strain could be...
Drosophila evolution challenges postulated redundancy in the E(spl) gene complex.
Maier, D, Marte, B M, Schäfer, W, Yu, Y, Preiss, A
The Enhancer of split [E(spl)] gene complex belongs to the class of neurogenic loci, which, in a concerted action, govern neurogenesis in Drosophila. Two genetically distinct functions, vital and...
The free radical in pyruvate formate-lyase is located on glycine-734.
Wagner, A F, Frey, M, Neugebauer, F A, Schäfer, W, Knappe, J
Pyruvate formate-lyase (acetyl-CoA:formate C-acetyltransferase, EC 2.3.1.54) from anaerobic Escherichia coli cells converts pyruvate to acetyl-CoA and formate by a unique homolytic mechanism that...
Cutinase is not required for fungal pathogenicity on pea.
Cutinase, a fungal extracellular esterase, has been proposed to be crucial in the early events of plant infection by many pathogenic fungi. To test the long-standing hypothesis that cutinase of...
Hube, B, Sanglard, D, Odds, F C, Hess, D, Monod, M, Schäfer, W, ...
Secreted aspartyl proteinases (Saps), encoded by a gene family with at least nine members (SAP1 to SAP9), are one of the most discussed virulence factors produced by the human pathogen Candida...
Peters, J, Peters, M, Lottspeich, F, Schäfer, W, Baumeister, W
The complete nucleotide sequence of the gene encoding the surface (hexagonally packed intermediate [HPI])-layer polypeptide of Deinococcus radiodurans Sark was determined and found to encode a...
Deane, R, Schäfer, W, Zimmermann, H P, Mueller, L, Görlich, D, Prehn, S, ...
We report the identification and characterization of a novel 124-kDa Ran binding protein, RanBP5. This protein is related to importin-beta, the key mediator of nuclear localization signal...
Thiel, H J, Schwarz, H, Fischinger, P, Bolognesi, D, Schäfer, W
Previous studies have demonstrated that the onset of AKR leukemia could be dramatically delayed and the overall incidence significantly reduced following treatment with high-titered heterologous...
Role of carbohydrate in biological functions of Friend murine leukemia virus gp71.
Schäfer, W, Fischinger, P J, Collins, J J, Bolognesi, D P
Purified gp71 of Friend murine leukemia virus (FLV) can interfere with virus infection, absorb neutralizing antibody, and in the presence of group-specific anti-gp71 antibody, hemagglutinate sheep...
Bolognesi, D P, Collins, J J, Leis, J P, Moennig, V, Schäfer, W, Atkinson, P H
Treatment of Friend leukemia virus gp71 with protease-free glycosidase enzymes results in removal of the major portion of the carbohydrate without affecting the amount of protein present. The...
Schäfer, W, Stroh, A, Berghöfer, S, Seiler, J, Vey, M, Kruse, M L, ...
Furin, a subtilisin-like eukaryotic endoprotease, is responsible for proteolytic cleavage of cellular and viral proteins transported via the constitutive secretory pathway. Cleavage occurs at the...
Signal transduction in Halobacterium depends on fumarate.
Marwan, W, Schäfer, W, Oesterhelt, D
The isolation of a straight-swimming mutant of Halobacterium halobium is reported which has a defect in switching the rotational sense of its flagellar motor. Cells of this mutant strain could be...
T-DNA of a crown gall tumor is organized in nucleosomes
Schäfer, W., Weising, K., Kahl, G.
Nucleosomes were isolated from chromatin of suspension cultured cells of Nicotiana tabacum var. White Burley, which were either habituated or transformed by Agrobacterium tumefaciens, strain T37....
Calvete, J J, Mann, K, Schäfer, W, Sanz, L, Reinert, M, Nessau, S, ...
We report the complete amino acid sequence of HSP-1, a major protein isolated from stallion seminal plasma or acid extracts of ejaculated spermatozoa. The protein consists of 121 amino acids...
Calvete, J J, Mann, K, Schäfer, W, Fernandez-Lafuente, R, Guisán, J M
The human integrin glycoprotein (GP)IIb/IIIa plays a central role in haemostasis as an inducible receptor for fibrinogen and other RGD-containing adhesive proteins at the platelet plasma membrane....