L. Kobbelt, P. Schröder, F. Losasso, S. Schaefer, J. Warren
Previous parametric representations of smooth genus-zero surfaces require a collection of abutting patches (e.g. splines, NURBS, recursively subdivided polygons). We introduce a simple construction...
The epsilon regime with Wilson fermions (2009)
Bar, O., Necco, Silvia, Schaefer, S.
31 pages, 2 figures.-- ISI Article Identifier: 000265600800006.-- Printed version published March 2009 .-- ArXiv pre-print avaible at: http://arxiv.org/abs/0812.2403
Nonlinear Subdivision Through Nonlinear Averaging (2008)
S. Schaefer, E. Vouga, R. Goldman
We investigate a general class of nonlinear subdivision algorithms for functions of a real or complex variable built from linear subdivision algorithms by replacing binary linear averages such as the...
Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures (2008)
Schultheiss, H., Sandweg, C. W., Obry, B., Hermsdoerfer, S. J., Schaefer, S., Leven, B., ...
The spatial profiles and the dissipation characteristics of spin-wave quasi-eigenmodes are investigated in small magnetic Ni$_{81}$Fe$_{19}$ ring structures using Brillouin light scattering...
Modification of the thermal spin-wave spectrum in a Ni81Fe19 stripe by a domain wall (2008)
Sandweg, C. W., Hermsdoerfer, S. J., Schultheiss, H., Schaefer, S., Leven, B., Hillebrands, B.
The thermal spin-wave distribution in a Ni81Fe19 stripe with an asymmetric transverse domain wall has been investigated using Brillouin light scattering microscopy. Clear evidence has been found that...
A Geometric Construction of Coordinates for Convex Polyhedra using Polar Duals (2008)
M. Desbrun, H. Pottmann (editors, T. Ju, S. Schaefer, J. Warren, M. Desbrun
A fundamental problem in geometry processing is that of expressing a point inside a convex polyhedron as a combination of the vertices of the polyhedron. Instances of this problem arise often in mesh...
Example-Based Skeleton Extraction (2008)
Er Belyaev, Michael Garl, S. Schaefer, C. Yuksel
We present a method for extracting a hierarchical, rigid skeleton from a set of example poses. We then use this skeleton to not only reproduce the example poses, but create new deformations in the...
Geometric Construction of Coordinates for Convex Polyhedra using Polar Duals (2008)
M. Desbrun, H. Pottmann (editors, T. Ju, S. Schaefer, J. Warren, M. Desbrun
A fundamental problem in geometry processing is that of expressing a point inside a convex polyhedron as a combination of the vertices of the polyhedron. Instances of this problem arise often in mesh...
A Geometric Construction of Coordinates for Convex Polyhedra using Polar Duals (2008)
M. Desbrun, H. Pottmann (editors, T. Ju, S. Schaefer, J. Warren, M. Desbrun
A fundamental problem in geometry processing is that of expressing a point inside a convex polyhedron as a combination of the vertices of the polyhedron. Instances of this problem arise often in mesh...
A Geometric Construction of Coordinates for Convex Polyhedra using Polar Duals (2008)
M. Desbrun, H. Pottmann (editors, T. Ju, S. Schaefer, J. Warren, M. Desbrun
A fundamental problem in geometry processing is that of expressing a point inside a convex polyhedron as a combination of the vertices of the polyhedron. Instances of this problem arise often in mesh...
L. Kobbelt, P. Schröder, F. Losasso, S. Schaefer, J. Warren
Previous parametric representations of smooth genus-zero surfaces require a collection of abutting patches (e.g. splines, NURBS, recursively subdivided polygons). We introduce a simple construction...
Subdivision Schemes and Attractors (2008)
M. Desbrun, H. Pottmann (editors, S. Schaefer, D. Levin, R. Goldman
Subdivision schemes generate self-similar curves and surfaces. Therefore there is a close connection between curves and surfaces generated by subdivision algorithms and self-similar fractals...
L. Kobbelt, P. Schröder, F. Losasso, S. Schaefer, J. Warren
Previous parametric representations of smooth genus-zero surfaces require a collection of abutting patches (e.g. splines, NURBS, recursively subdivided polygons). We introduce a simple construction...
S. Schaefer, E. Vouga, R. Goldman
We investigate a general class of nonlinear subdivision algorithms for functions of a real or complex variable built from linear subdivision algorithms by replacing binary linear averages such as the...
Cluster observations of collisionless Hall reconnection at high-latitude magnetopause (2008)
Zhang, H., Fritz, T. A., Fu, S. Y., Schaefer, S., Glassmeier, K. H., ...
We present an efficient algorithm for subdividing non-uniform B-splines of arbitrary degree in a manner similar to the Lane-Riesenfeld subdivision algorithm for uniform Bsplines of arbitrary degree....
Smooth Subdivision of Tetrahedral Meshes (2007)
R. Scopigno, D. Zorin, S. Schaefer, J. Hakenberg, J. Warren
We describe a new subdivision scheme for unstructured tetrahedral meshes. Previous tetrahderal schemes based on generalizations of box splines have encoded arbitrary directional preferences in their...
Room Temperature Electrical Detection of Spin Coherence in C60 (2007)
Harneit, W., Boehme, C., Schaefer, S., Huebener, K., Fostiropoulos, K., Lips, K.
An experimental demonstration of electrical detection of coherent spin motion of weakly coupled, localized electron spins in thin Fullerene C60 films at room temperature is presented. Pulsed...
Overlap fermions on a twisted mass sea (2006)
Bar, O., Jansen, K., Schaefer, S., Scorzato, L., Shindler, A.
We present first results of a mixed action project. We analyze gauge configurations generated with two flavors of dynamical twisted mass fermions. Neuberger's overlap Dirac operator is used for the...
A new approach, based on the so-called Self-Consistent RPA, is developed for particle-hole correlation functions. This leads to a fully self-consistent RPA-like theory which satisfies the $f$-sum...
On the excitation of ULF waves by solar wind pressure enhancements (2006)
We study the onset and development of an ultra low frequency (ULF) pulsation excited by a storm sudden commencement. On 30 August 2001, 14:10 UT, the Cluster spacecraft are located in the dayside...
Algorithms for dynamical overlap fermions. 2006-07-23 - 2006-07-28 (2006)
Contribution to a conf. proceeding (book/online)
Algorithms for dynamical overlap fermions. 2006-07-23 - 2006-07-28 (2006)
Contribution to a conf. proceeding (book/online)
Overlap fermions on a twisted mass sea. 2006-07-23 - 2006-07-28 (2006)
O. Bär, K. Jansen, S. Schaefer, L. Scorzato, ...
Contribution to a conf. proceeding (book/online)
Quark condensate in one-flavor QCD. (2006)
T. DeGrand, R. Hoffmann, S. Schaefer, Z. Liu
Journal article
On the excitation of ULF waves by solar wind pressure enhancements (2006)
Eriksson, P. T. I., Blomberg, L. G., Schaefer, S.
We study the onset and development of an ultra low frequency (ULF) pulsation excited by a storm sudden commencement. On 30 August 2001, 14:10 UT, the Cluster spacecraft are located in the dayside...
On the excitation of ULF waves by solar wind pressure enhancements (2006)
Eriksson, P. T. I., Blomberg, L. G., Schaefer, S.
We study the onset and development of an ultra low frequency (ULF) pulsation excited by a storm sudden commencement. On 30 August 2001, 14:10 UT, the Cluster spacecraft are located in the dayside...
Berezhna, S., Schaefer, S., Heintzmann, R., Jahnz, M., Boese, G., Deniz, A., ...
We report on new insights into the mechanisms of short single and double stranded oligonucleotide release from cationic lipid complexes (lipoplexes), used in gene therapy. Specifically, we modeled...
R. Scopigno, D. Zorin, S. Schaefer, J. Hakenberg, J. Warren
We describe a new subdivision scheme for unstructured tetrahedral meshes. Previous tetrahderal schemes based on generalizations of box splines have encoded arbitrary directional preferences in their...
Is granulocyte colony-stimulating factor level predictive for human IVF outcome? (2005)
Salmassi, A., Schmutzler, A.G., Schaefer, S., Koch, K., Hedderich, J., Jonat, W., ...
BACKGROUND: We investigated granulocyte colony-stimulating factor (G-CSF) in human reproduction. METHODS: From a total sample of 93 patients, we analysed in group 1 (n=82) the level of G-CSF and...
Is granulocyte colony-stimulating factor level predictive for human IVF outcome? (2005)
Salmassi, A., Schmutzler, A.G., Schaefer, S., Koch, K., Hedderich, J., Jonat, W., ...
BACKGROUND: We investigated granulocyte colony-stimulating factor (G-CSF) in human reproduction. METHODS: From a total sample of 93 patients, we analysed in group 1 (n=82) the level of G-CSF and...
Improving meson two-point functions by low-mode averaging (2004)
Some meson correlation functions have a large contribution from the low lying eigenmodes of the Dirac operator. The contribution of these eigenmodes can be averaged over all positions of the source....
Lofting Curve Networks using Subdivision Surfaces (2004)
R. Scopigno, S. Schaefer, J. Warren, D. Zorin, D. Zorin
Lofting is a traditional technique for creating a curved shape by first specifying a network of curves that approximates the desired shape and then interpolating these curves with a smooth surface....
Lofting curve networks using subdivision surfaces (2004)
S. Schaefer, J. Warren, D. Zorin
Lofting is a traditional technique for creating a curved shape by first specifying a network of curves that approximates the desired shape and then interpolating these curves with a smooth surface....
Low-Lying Nucleons from Chirally Improved Fermions (2003)
Broemmel, D., Crompton, P. R., Gattringer, C., Glozman, L. Ya., Lang, C. B., Schaefer, A., ...
We report on our preliminary results on the low-lying excited nucleon spectra which we obtain through a variational basis formed with three different interpolators.
Braun, V. M., Burch, T., Gattringer, C., Göckeler, M., Lacagnina, G., Schaefer, S., ...
We present a quenched lattice calculation of $f_V^\perp/f_V$, the coupling of vector mesons to the tensor current normalized by the vector meson decay constant. The chirally improved lattice Dirac...
Imani,J., Berting,A., Nitsche,S., Schaefer,S., Gerlich,W. H., Neumann,K. H.
The percentage of cells successfully transformed by Agrobacteria is usually very low (not more than 10% and usually much less; Thomas et al., 1989). In this report we show that in carrot (Daucus...
Rios,G., Lossow,A., Hertel,B., Breuer,F., Schaefer,S., Broich,M., ...
To assist in the analysis of plant gene functions we have generated a new Arabidopsis insertion mutant collection of 90 000 lines that carry the T-DNA of Agrobacterium gene fusion vector pPCV6NFHyg....
A lattice study of the spin structure of the Lambda hyperon (2002)
Göckeler, M., Horsley, R., Pleiter, D., Rakow, P. E. L., Schaefer, S., Schäfer, A., ...
The internal spin structure of the Lambda is of special importance for the understanding of the spin structure of hadrons in general. The comparison between the nucleon and Lambda allows for a test...
Applied lattice gauge calculations: diquark content of the nucleon (2002)
Göckeler, M., Horsley, R., Klaus, B., Pleiter, D., Rakow, P. E. L., Schaefer, S., ...
As an example of an application of lattice QCD we describe a computation of four-quark operators in the nucleon. The results are interpreted in a diquark language.
Rios, G., Lossow, A., Hertel, B., Breuer, F., Schaefer, S., Broich, M., ...
To assist in the analysis of plant gene functions we have generated a new Arabidopsis insertion mutant collection of 90 000 lines that carry the T-DNA of Agrobacterium gene fusion vector pPCV6NFHyg....
Imani, J., Berting, A., Nitsche, S., Schaefer, S., Gerlich, W. H., Neumann, K. H.
The percentage of cells successfully transformed by Agrobacteria is usually very low (not more than 10% and usually much less; Thomas et al., 1989). In this report we show that in carrot (Daucus...
The spin structure of the Lambda hyperon in quenched lattice QCD (2001)
Göckeler, M., Horsley, R., Pleiter, D., Rakow, P. E. L., Schaefer, S., Schäfer, A., ...
It has been suggested to use the production of Lambda hyperons for investigating the nucleon spin structure. The viability of this idea depends crucially on the spin structure of the Lambda. Using...
Schaefer, S., Schäfer, A., Stratmann, M.
The impact of recently calculated next-to-next-to-leading order QCD corrections and soft gluon resummations on the extraction of higher twist contributions to the deep-inelastic structure function...
A lattice evaluation of four-quark operators in the nucleon (2001)
Göckeler, M., Horsley, R., Klaus, B., Pleiter, D., Rakow, P. E. L., Schaefer, S., ...
Nucleon matrix elements of various four-quark operators are evaluated in quenched lattice QCD using Wilson fermions. Some of these operators give rise to twist-four contributions to nucleon structure...
Martin-Palma, R.J., Vazquez, L., Martinez-Duart, J.M., Schnell, M., Schaefer, S.
In this paper, the emitter of multicrystalline silicon solar cells has been chemically etched in order to form porous silicon (PS) layers, usually known as stain-etched PS, to be used at the same...
Chang, SF, Netter, HJ, Hildt, E, Schuster, R, Schaefer, S, Hsu, YC, ...
Duck hepatitis B viruses (DHBV), unlike mammalian hepadnaviruses, are thought to lack X genes, which encode transcription-regulatory proteins believed to contribute to the development of...
Chang, S. F., Netter, H. J., Hildt, E., Schuster, R., Schaefer, S., Hsu, Y. C., ...
Duck hepatitis B viruses (DHBV), unlike mammalian hepadnaviruses, are thought to lack X genes, which encode transcription-regulatory proteins believed to contribute to the development of...
Four-quark operators in hadrons (2000)
Capitani, S., Gockeler, M., Horsley, R., Klaus, B., Kurzinger, W., Petters, D., ...
We present calculations of matrix elements of 4-quark operators in the pion and in the nucleon extracted from quenched Monte Carlo simulations at beta = 6.0 using Wilson fermions. These operators are...
An overview of plasma sources suitable for dry etching of solar cells (2000)
Schaefer, S., Lautenschlager, H., Juch, M., Siniaguine, O., Lüdemann, R.
New simplified methods for patterning the rear contact of RP-PERC high-efficiency solar cells (2000)
Glunz, S.W., Preu, R., Schaefer, S., Schneiderlöchner, E., Pfleging, W., Lüdemann, R., ...
Diffractive charged meson pair production (1999)
Lehmann-Dronke, B., Maul, M., Schaefer, S., Stein, E., Schäfer, A.
We investigate the possibility to measure the nonforward gluon distribution function by means of diffractively produced \pi^+\pi^- and K^+K^- pairs in polarized lepton nucleon scattering. The...
A new approach, based on the so-called Self-Consistent RPA, is developed for particle-hole correlation functions. This leads to a fully self-consistent RPA-like theory which satisfies the $f$-sum...
A new approach, based on the so-called Self-Consistent RPA, is developed for particle-hole correlation functions. This leads to a fully self-consistent RPA-like theory which satisfies the $f$-sum...
Verfahren zur Herstellung von Kontaktstrukturen in Halbleiterbauelementen (1999)
WO 9956324 A UPAB: 19991221 NOVELTY - The contact structure formation method uses an etching mask for formation of recesses in one or more semiconductor layers (1,2). Back etching provides negative...
Coordination of tRNA nuclear export with processing of tRNA. (1999)
Lipowsky, G., Bischoff, F. R., Izaurralde, E., Kutay, U., Schaefer, S., Gross, H. J., ...
Laufs, J, Wirtz, U, Kammann, M, Matzeit, V, Schaefer, S, Schell, J, ...
The maize transposon Activator (Ac) and in vitro-generated nonautonomous derivatives thereof [Ac delta or Dissociation (Ds) elements] were inserted into the genome of a geminivirus of graminaceous...
Wheat dwarf virus vectors replicate and express foreign genes in cells of monocotyledonous plants.
Matzeit, V, Schaefer, S, Kammann, M, Schalk, H J, Schell, J, Gronenborn, B
Wheat dwarf virus (WDV) is a geminivirus that infects monocotyledonous plants. To exploit the potential of WDV as a replicative gene vector, we developed a transient replication and expression system...
Ischemic preconditioning stimulates sodium and proton transport in isolated rat hearts.
Ramasamy, R, Liu, H, Anderson, S, Lundmark, J, Schaefer, S
One or more brief periods of ischemia, termed preconditioning, dramatically limits infarct size and reduces intracellular acidosis during subsequent ischemia, potentially via enhanced sarcolemmal...
Stoll-Becker, S, Repp, R, Glebe, D, Schaefer, S, Kreuder, J, Kann, M, ...
Hepatitis B virus (HBV) has been reported to exist in peripheral blood mononuclear cells (PBMC), but it is not clear whether it replicates there. A precondition for replication should be the...
Erhardt, A, Schaefer, S, Athanassiou, N, Kann, M, Gerlich, W H
We have developed a sensitive and quantitative assay for hepatitis B virus (HBV) DNA in serum or plasma in which PCR and then microtiter hybridization analysis are used. Assay of HBV DNA in serum or...
Repp, R, Rhiel, S, Heermann, K H, Schaefer, S, Keller, C, Ndumbe, P, ...
A nested polymerase chain reaction (PCR) protocol was developed for rapid genotyping of hepatitis B virus (HBV). During the first PCR round, a universal HBV primer pair was used to amplify the entire...
Schaefer, S, Schwartz, G G, Gober, J R, Wong, A K, Camacho, S A, Massie, B, ...
The mechanisms responsible for changes in myocardial contractility during regional ischemia are unknown. Since changes in high-energy phosphates during ischemia are sensitive to reductions in...
Determination of the origin cleavage and joining domain of geminivirus Rep proteins.
Heyraud-Nitschke, F, Schumacher, S, Laufs, J, Schaefer, S, Schell, J, Gronenborn, B
Replication of the single-stranded DNA genome of plant geminiviruses follows a rolling circle mechanism. It strictly depends on a 'rolling circle replication initiator protein', the M(r) 41 kDa viral...
Identification of the initiation sequence for viral-strand DNA synthesis of wheat dwarf virus.
Heyraud, F, Matzeit, V, Kammann, M, Schaefer, S, Schell, J, Gronenborn, B
The intergenic region of the circular single-stranded DNA genome of geminiviruses contains a sequence potentially able to fold into a stem-loop structure. This sequence has been reported to be...
Höhne, M, Schaefer, S, Seifer, M, Feitelson, M A, Paul, D, Gerlich, W H
Persistent infection by hepatitis B virus (HBV) is epidemiologically correlated with the prevalence of hepatocellular carcinoma, but its role in tumor development is not yet understood. To study the...
Laufs, J, Wirtz, U, Kammann, M, Matzeit, V, Schaefer, S, Schell, J, ...
The maize transposon Activator (Ac) and in vitro-generated nonautonomous derivatives thereof [Ac delta or Dissociation (Ds) elements] were inserted into the genome of a geminivirus of graminaceous...
Wheat dwarf virus vectors replicate and express foreign genes in cells of monocotyledonous plants.
Matzeit, V, Schaefer, S, Kammann, M, Schalk, H J, Schell, J, Gronenborn, B
Wheat dwarf virus (WDV) is a geminivirus that infects monocotyledonous plants. To exploit the potential of WDV as a replicative gene vector, we developed a transient replication and expression system...
Ischemic preconditioning stimulates sodium and proton transport in isolated rat hearts.
Ramasamy, R, Liu, H, Anderson, S, Lundmark, J, Schaefer, S
One or more brief periods of ischemia, termed preconditioning, dramatically limits infarct size and reduces intracellular acidosis during subsequent ischemia, potentially via enhanced sarcolemmal...
Stoll-Becker, S, Repp, R, Glebe, D, Schaefer, S, Kreuder, J, Kann, M, ...
Hepatitis B virus (HBV) has been reported to exist in peripheral blood mononuclear cells (PBMC), but it is not clear whether it replicates there. A precondition for replication should be the...
Erhardt, A, Schaefer, S, Athanassiou, N, Kann, M, Gerlich, W H
We have developed a sensitive and quantitative assay for hepatitis B virus (HBV) DNA in serum or plasma in which PCR and then microtiter hybridization analysis are used. Assay of HBV DNA in serum or...
Repp, R, Rhiel, S, Heermann, K H, Schaefer, S, Keller, C, Ndumbe, P, ...
A nested polymerase chain reaction (PCR) protocol was developed for rapid genotyping of hepatitis B virus (HBV). During the first PCR round, a universal HBV primer pair was used to amplify the entire...
Schaefer, S, Schwartz, G G, Gober, J R, Wong, A K, Camacho, S A, Massie, B, ...
The mechanisms responsible for changes in myocardial contractility during regional ischemia are unknown. Since changes in high-energy phosphates during ischemia are sensitive to reductions in...
Determination of the origin cleavage and joining domain of geminivirus Rep proteins.
Heyraud-Nitschke, F, Schumacher, S, Laufs, J, Schaefer, S, Schell, J, Gronenborn, B
Replication of the single-stranded DNA genome of plant geminiviruses follows a rolling circle mechanism. It strictly depends on a 'rolling circle replication initiator protein', the M(r) 41 kDa viral...
Identification of the initiation sequence for viral-strand DNA synthesis of wheat dwarf virus.
Heyraud, F, Matzeit, V, Kammann, M, Schaefer, S, Schell, J, Gronenborn, B
The intergenic region of the circular single-stranded DNA genome of geminiviruses contains a sequence potentially able to fold into a stem-loop structure. This sequence has been reported to be...
Höhne, M, Schaefer, S, Seifer, M, Feitelson, M A, Paul, D, Gerlich, W H
Persistent infection by hepatitis B virus (HBV) is epidemiologically correlated with the prevalence of hepatocellular carcinoma, but its role in tumor development is not yet understood. To study the...
Ds physics from fine lattices 2008-07-14 - 2008-07-20
G. Von Hippel, R. Sommer, J. Heitger, S. Schaefer, ...
Conference presentation