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126 results on '"Henkel F"'

3. Long-distance atom-photon entanglement

Author

Rosenfeld, W., Hocke, F., Henkel, F., Krug, M., Volz, J., Weber, M., and Weinfurter, H.

Subjects
Quantum Physics
Abstract

We report the observation of entanglement between a single trapped atom and a single photon at remote locations. The degree of coherence of the entangled atom-photon pair is verified via appropriate local correlation measurements, after communicating the photon via an optical fiber link of 300 m length. In addition we measured the temporal evolution of the atomic density matrix after projecting the atom via a state measurement of the photon onto several well defined spin states. We find that the state of the single atom dephases on a timescale of 150 $\mu$s, which represents an important step toward long-distance quantum networking with individual neutral atoms., Comment: 4 pages, 4 figures

Published
2008
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8. Learning to Listen, Read, and Follow: Score Following as a Reinforcement Learning Game

Author

Dorfer, M., Henkel, F., and Gerhard Widmer

Subjects
FOS: Computer and information sciences, Sound (cs.SD), Computer Science - Machine Learning, Artificial Intelligence (cs.AI), Audio and Speech Processing (eess.AS), Computer Science - Artificial Intelligence, FOS: Electrical engineering, electronic engineering, information engineering, Computer Science - Sound, Machine Learning (cs.LG), Electrical Engineering and Systems Science - Audio and Speech Processing
Abstract

Score following is the process of tracking a musical performance (audio) with respect to a known symbolic representation (a score). We start this paper by formulating score following as a multimodal Markov Decision Process, the mathematical foundation for sequential decision making. Given this formal definition, we address the score following task with state-of-the-art deep reinforcement learning (RL) algorithms such as synchronous advantage actor critic (A2C). In particular, we design multimodal RL agents that simultaneously learn to listen to music, read the scores from images of sheet music, and follow the audio along in the sheet, in an end-to-end fashion. All this behavior is learned entirely from scratch, based on a weak and potentially delayed reward signal that indicates to the agent how close it is to the correct position in the score. Besides discussing the theoretical advantages of this learning paradigm, we show in experiments that it is in fact superior compared to previously proposed methods for score following in raw sheet music images., Published in the Proceedings of the 19th International Society for Music Information Retrieval Conference, Paris, France, 2018

Published
2018
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12. A 1800 k furnace designed for in situ synchrotron microtomography

Author

Grupp, R., Henkel, F., Nöthe, M., Banhart, J., Kieback, B., Haibel, A., and Publica

Subjects
microtomography, radiation furnace
Abstract

A radiation furnace that covers the temperature range from room temperature up to 1800 K has been designed and constructed for in situ synchrotron microtomography. The furnace operates under a vacuum or under any inert gas atmosphere. The two 1000 W halogen heating lamps are water- and air-cooled. The samples are located at the focus of these lamp reflectors on a rotary feedthrough that is connected to a driving rotation stage below the furnace. The X-ray beam penetrates the furnace through two X-ray-transparent vacuum-sealed windows. Further windows can be used for temperature control, sample changing and gas inflow and outflow.

Published
2009

38. Magnetic properties of the RCo x Ge2 (R=Gd–Er) compounds

Author

Baran, S., Henkel, F., Kaczorowski, D., Hernández-Velasco, J., Penc, B., Stüßer, N., Szytuła, A., and Wawrzyńska, E.

Subjects
*MAGNETIC properties, *MAGNETIZATION, *MAGNETISM, *MAGNETIC susceptibility
Abstract

Abstract: Magnetization, magnetic susceptibility, X-ray and neutron diffraction measurements down to 1.5K were performed on polycrystalline RCo x Ge2 (R=Gd–Er) samples, in which x =0.4–0.5. All of them crystallize in the orthorhombic structure of the CeNiSi2-type. The compounds were found to order antiferromagnetically at low temperatures except for the Tb and Dy samples, in which no magnetic contributions were observed in the neutron diffraction patterns recorded at 1.5K although transitions are visible in the temperature dependences of the magnetic susceptibility of these compounds. In the case of HoCo0.4Ge2 magnetic order appearing below the Néel temperature of 8K is described by the propagation vector k =(1/2, 1/2, 0) and for the ErCo x Ge2 compounds at 1.5K the structure is described by k =(k x , k x , 0). The value of the k x component depends on the concentration x. [Copyright &y& Elsevier]

Published
2006
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40. Solving linear dynamic problems

Author

Klein, D., Schalk, M., and Henkel, F.–O.

Abstract

The techniques for solving linear dynamic problems with the finite–element method are presented. A survey of the basic calculation methods is given. The application of these methods is demonstrated with some practical examples. Special attention is paid to the proper use of the finite–element method in structural dynamics.

Published
1992
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41. Meteorology

Author

B., L. C. W. and Henkel, F. W.

Abstract

n/a

Published
1911

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