H. Hagen

High-quality rendering of quartic spline surfaces on the GPU (2008)

Reis, G., Zeilfelder, F., Hering-Bertram, M., Farin, G.E., Hagen, H.

We present a novel GPU-based algorithm for high-quality rendering of bivariate spline surfaces. An essential difference to the known methods for rendering graph surfaces is that we use quartic smooth...

Scientific Visualization (2007)

Rosenblum, L, Earnshaw, R.A., Encarnacao, J, Hagen, H, Kaufman, A, Klimenko, S, ...

Moment invariants for the analysis of 2D flow fields (2007)

Schlemmer, M., Heringer, M., Morr, F., Hotz, I., Hering-Bertram, M., Garth, C., ...

We present a novel approach for analyzing two-dimensional (2D) flow field data based on the idea of invariant moments. Moment invariants have traditionally been used in computer vision applications,...

Reverse engineering with subdivision surfaces (2007)

Keller, P., Hering-Bertram, M., Hagen, H.

Fast implicit KD-trees: Accelerated isosurface ray tracing and maximum intensity projection for large scalar fields (2007)

Groß, M., Lojewski, C., Hering-Bertram, M., Hagen, H.

A visualization framework for time dependent metal casting simulations (2007)

Groß, M., Lojewski, C., Hagen, H.

Simulation and visualization of indoor-acoustics for robot control (2007)

Schmitz, N., Wettach, J., Deines, E., Dannenmann, P., Bertram, M., Berns, K., ...

Listener-based analysis of surface importance for acoustic metrics (2007)

Michel, F., Deines, E., Hering-Bertram, M., Garth, C., Hagen, H.

Continuous improvement process in virtual reality (2007)

Wagner, G., Keller, P., Michel, F., Hering-Bertram, M., Ostermayer, D., Hagen, H.

Fluorous Zirconocene(IV) Complexes and Their Olefin Polymerization Activity in Toluene and Fluorous Biphasic Solvent Systems. (2005)

Merle, P.G., Cheron, V., Hagen, H., Lutz, M.H., Deelman, B.J., Koten, G. Van

Phonon tracing for auralization and visualization of sound (2005)

Bertram, M., Deines, E., Mohring, J., Jegorovs, J., Hagen, H.

O,N-Chelated Vanadium(IV) Oxo Aminophenolate Complexes: the Effect of Steric Bulk on Vanadium Coordination Geometry. Can this Influence be detected Spectroscopically? (2004)

Hagen, H., Reinoso, S., Reijerse, E.J., Lutz, M.H., Spek, A.L., ...

Virtual try-on: Topics in realistic, individualized dressing in virtual reality (2004)

Divivier, A., Trieb, R., Ebert, A., Hagen, H., Groß, C., Fuhrmann, A., ...

In the course of the project Virtual Try-On new VR technologies have been developed, which form the basis for a realistic, three dimensional, (real-time) simulation and visualization of...

EUROGRAPHICS 2003 / M. Chover, H. Hagen and D. Tost Short Presentations Adaptive quantization with error bounds for compressed (2003)

Eurographics M. Chover, H. Hagen, D. Tost, Short Presentations, Markus Grabner

We present a simple method to adaptively determine compression parameters according to the given input data.

Homogeneous Vanadium-Based Catalysts for the Ziegler-Natta Polymerization of a-Olefins (2002)

Koten, G. Van, Hagen, H., Boersma, J.

Although their activity is often inferior to that of other systems, the use of vanadium-based catalysts in homogeneous Ziegler–Natta polymerizations allows the preparation of high-molecular-weight...

Homogeneous vanadium-based catalysts for the Ziegler–Natta Polymerization of α-Olefins (2002)

Hagen, H., Boersma, J., Koten, G. Van

Although their activity is often inferior to that of other systems, the use of vanadium-based catalysts in homogeneous Ziegler–Natta polymerizations allows the preparation of high-molecular-weight...

Vanadium(III) and-(IV) Complexes with O,N-Chelated Aminophenolate Ligands: Synthesis, Characterization and Activity in Ethene/Propene Copolymerization (2001)

Koten, G. Van, Hagen, H., Boersma, J., Lutz, M., Spek, A.L.

Monoanionic, potentially bi- or terdentate aminophenolates, ([OC6H3(CH2NMe2)-2-R-4)]-, R = H (a), Me (b), tBu (c), Cl (d), N=NPh (e), MeO (f) and [OC6H2(CH2NMe2)2-2,6-Me-4]- (g)), have been used in...

Approximation and Smoothing with Spline curves using Multicriteria Optimization Techniques (2000)

U. Bossong, H. Hagen

The design of freeform curves and surfaces is one of the major topics of CAD/CAM. Often data points detected by a scanning process have to be interpolated or approximated. For aesthetic and technical...

Particle Tracing Algorithms for 3D Curvilinear Grids (2000)

G. Nielson, H. M Uller, H. Hagen, I. Ari Sadarjoen, Theo Van Walsum, ...

. This chapter presents a comparison of several particle tracing algorithms on curvilinear grids. The fundamentals of particle tracing algorithms are described and used to split tracing algorithms...

O,N-Chelated Boron Aminophenolate Complexes : Crystal Structure ofBPh2(OC6H4(CH2NMe2)-2) (2000)

Koten, G. Van, Hagen, H., Reinoso, S., Albrecht, M.A., Boersma, J., Spek, A.L.

Two diphenylboron ortho-aminophenolate complexes, [BPh2(OC6H4(CH2NMe2)-2)] (2) and [BPh2(OC6H2(CH2NMe2)2-2,6-Me-4)] (6), have been prepared in a one-pot procedure approach starting from B(OMe)3. The...

Vanadium(IV) and -(V) Complexes with O,N-Chelating Aminophenolate and Pyridylalkoxide, (2000)

Koten, G. Van, Hagen, H., Bezemer, C., Boersma, J., Kooijman, H., Lutz, M., ...

Two different monoanionic O,N-chelating ligand systems, i.e., [OC6H2(CH2NMe2)-2-Me2-4,6]- (1) and [OCMe2([2]-Py)]- (2), have been applied in the synthesis of vanadium(V) complexes. The tertiary amine...

Visualization in string theory (2000)

Klimenko, S., Nikitin, I., Burkin, V., Semenov, V., Tarlapan, O., Hagen, H.

Synthesis and Characterization of O,N-Chelated Vanadium (IV) Oxo Phenolate Complexes : the Electronic Effect of meta- and para Substituents on the Vanadium Center (1999)

Koten, G. Van, Hagen, H., Barbon, A., Lutz, B.T.G., Spek, A.L.

A series of O,N-chelated vanadium(IV) oxo bis(phenolate) complexes (1a-i) have been prepared from [VOCl2(THF)2] and several ortho-amino-functionalized phenols in the presence of a base. The...

Visualization in string theory (1999)

Klimenko, K., Nikitin, I., Burkin, V., Semenov, V., Tarlapan, O., Hagen, H.

Synthesis and reactivity of tantalum alkylidene complexes containing the C,N,N'-chelating aryldiamine ligand [C6H4(CH2N(Me)CH2CH2NMe2)-2- (CNN). X-ray structurs of [TaCl2(=CH-t-Bu) (CNN)], [Ta{CH2)3-1,3}(CNN)(O-t-Bu)2], and [Ta(CNN)(O-t-Bu)2(H2C=CH2)] (1997)

Koten, G. Van, Rietveld, M.H.P., Teunissen, W., Hagen, H., Water, L. Van De, Grove, D.M., ...

The potentially C,N,N'-chelating anionic aryldiamine ligand [C6H4(CH2N(Me)CH2CH2NMe2)-2]- (CNN) has been employed in the preparation of six-coordinate Ta(V) alkylidene complexes. The new dichloro...

Tantalacyclobutane complexes containing the potentially C,N,N'-Coordinating ligand [C6H4(CH2N(Me)CH2CH2NMe2)-2]- (CNN) and their reactivity with carbon monoxide and tert-butyl isocyanide. X-ray molecular structures of [Ta{CH2CH(Me)CH2-1,3} (CNN)(O-t-Bu)2], [Ta{CH2CH(Ph)CH2-1,3} (CNN) (O-t-Bu)2], [Ta{C(O)((CH2)3-1,3)} (CNN) (Ot-Bu)2], and [Ta{C(=N-t-Bu)CH2CH(Ph)CH2-1,4} (CNN (O-t-Bu)2] (1997)

Koten, G. Van, Rietveld, M.H.P., Hagen, H., Water, L. Van De, Grove, D.M., Kooijman, H., ...

From the reactions of the unsubstituted tantalacyclobutane complex [Ta{(CH2)3-1,3}(CNN)(O-t-Bu)2] (CNN = [C6H4(CH2N(Me)CH2CH2NMe2)-2]-) (1) with propene and styrene have been isolated in good yields...

Particle Tracing Algorithms for 3D Curvilinear Grids (1996)

G. Nielson, H. M Uller, H. Hagen, I. Ari Sadarjoen, Theo Van Walsum, ...

. This chapter presents a comparison of several particle tracing algorithms on curvilinear grids. The fundamentals of particle tracing algorithms are described and used to split tracing algorithms...