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2015


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Precise Localization and Control of Catalytic Janus Micromotors using Weak Magnetic Fields

Khalil, I. S., Magdanz, V., Sanchez, S., Schmidt, O. G., Misra, S.

{International Journal of Advanced Robotic Systems}, 12, InTech, Rijeka, Croatia, 2015 (article)

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DOI [BibTex]

2015


DOI [BibTex]


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Nano-photocatalysts in microfluidics, energy conversion and environmental applications

Parmar, J., Jang, S., Soler, L., Kim, D., Sánchez, S.

{Lab on a Chip}, 15(11):2352-2356, Royal Society of Chemistry, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Geometrically Tuned Channel Permeability

Malgaretti, P., Pagonabarraga, I., Rubi, J. M.

{Macromolecular Symposia}, 357(1):178-188, WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Static dielectric properties of dense ionic fluids

Zarubin, G., Bier, M.

{The Journal of Chemical Physics}, 142(18), American Institute of Physics, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Chemically Powered Micro-and Nanomotors

Sánchez, S., Soler, L., Katuri, J.

{Angewandte Chemie, International Edition}, 54(5):1414-1444, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 2015 (article)

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[BibTex]

[BibTex]


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A systematic search for transiting planets in the K2 data

Foreman-Mackey, D., Montet, B., Hogg, D., Morton, T., Wang, D., Schölkopf, B.

The Astrophysical Journal, 806(2), 2015 (article)

Abstract
Photometry of stars from the K2 extension of NASA’s Kepler mission is afflicted by systematic effects caused by small (few-pixel) drifts in the telescope pointing and other spacecraft issues. We present a method for searching K2 light curves for evidence of exoplanets by simultaneously fitting for these systematics and the transit signals of interest. This method is more computationally expensive than standard search algorithms but we demonstrate that it can be efficiently implemented and used to discover transit signals. We apply this method to the full Campaign 1 data set and report a list of 36 planet candidates transiting 31 stars, along with an analysis of the pipeline performance and detection efficiency based on artificial signal injections and recoveries. For all planet candidates, we present posterior distributions on the properties of each system based strictly on the transit observables.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Learning Movement Primitive Attractor Goals and Sequential Skills from Kinesthetic Demonstrations

Manschitz, S., Kober, J., Gienger, M., Peters, J.

Robotics and Autonomous Systems, 74, Part A, pages: 97-107, 2015 (article)

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Bayesian Optimization for Learning Gaits under Uncertainty

Calandra, R., Seyfarth, A., Peters, J., Deisenroth, M.

Annals of Mathematics and Artificial Intelligence, pages: 1-19, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Assessment of murine brain tissue shrinkage caused by different histological fixatives using magnetic resonance and computed tomography imaging

Wehrl, H. F., Bezrukov, I., Wiehr, S., Lehnhoff, M., Fuchs, K., Mannheim, J. G., Quintanilla-Martinez, L., Kneilling, M., Pichler, B. J., Sauter, A. W.

Histology and Histopathology, 30(5):601-613, 2015 (article)

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[BibTex]

[BibTex]


Selectable Nanopattern Arrays for Nanolithographic Imprint and Etch-Mask Applications
Selectable Nanopattern Arrays for Nanolithographic Imprint and Etch-Mask Applications

Jeong, H. H., Mark, A. G., Lee, T., Son, K., Chen, W., Alarcon-Correa, M., Kim, I., Schütz, G., Fischer, P.

Adv. Science, 2(7):1500016, 2015, Featured cover article. (article)

Abstract
A parallel nanolithographic patterning method is presented that can be used to obtain arrays of multifunctional nanoparticles. These patterns can simply be converted into a variety of secondary nanopatterns that are useful for nanolithographic imprint, plasmonic, and etch-mask applications.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Improved Bayesian Information Criterion for Mixture Model Selection

Mehrjou, A., Hosseini, R., Araabi, B.

Pattern Recognition Letters, 69, pages: 22-27, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Applications of three-dimensional (3D) printing for microswimmers and bio-hybrid robotics

Stanton, M. M., Trichet-Paredes, C., Sanchez, S.

{Lab on a Chip}, 15(7):1634-1637, Royal Society of Chemistry, Cambridge, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Rheotaxis of spherical active particles near a planar wall

Uspal, W. E., Popescu, M. N., Dietrich, S., Tasinkevych, M.

{Soft Matter}, 11(33):6613-6632, Royal Society of Chemistry, Cambridge, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Phase diagram of fluid phases in He3\textminusHe4 mixtures

Farahmand Bafi, N., Maciolek, A., Dietrich, S.

{Physical Review E}, 91(2), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Three-body critical Casimir forces

Gomes de Mattos, T., Harnau, L., Dietrich, S.

{Physical Review E}, 91(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Linear and nonlinear magnetic properties of ferrofluids

Szalai, I., Nagy, S., Dietrich, S.

{Physical Review E}, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Microfluidic-Assisted Fabrication of Flexible and Location Traceable Organo-Motor

Seo, K. D., Kwak, B. K., Sanchez, S., Kim, D. S.

{IEEE Transactions on Nanobioscience}, 14(3):298-304, IEEE, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Thermal and structural properties of ionic fluids

Bartsch, H., Dannenmann, O., Bier, M.

{Physical Review E}, 91(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Tracer diffusion of hard-sphere binary mixtures under nano-confinement

Marconi, U., Malgaretti, P., Pagonabarraga, I.

{The Journal of Chemical Physics}, 143(18), American Institute of Physics, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Fluctuating multicomponent lattice Boltzmann model

Belardinelli, D., Sbragaglia, M., Biferale, L., Gross, M., Varnik, F.

{Physical Review E}, 91(2), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Correlation matrix nearness and completion under observation uncertainty

Alaíz, C. M., Dinuzzo, F., Sra, S.

IMA Journal of Numerical Analysis, 35(1):325-340, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Quantitative evaluation of segmentation- and atlas- based attenuation correction for PET/MR on pediatric patients

Bezrukov, I., Schmidt, H., Gatidis, S., Mantlik, F., Schäfer, J. F., Schwenzer, N., Pichler, B. J.

Journal of Nuclear Medicine, 56(7):1067-1074, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


Exciting Engineered Passive Dynamics in a Bipedal Robot
Exciting Engineered Passive Dynamics in a Bipedal Robot

Renjewski, D., Spröwitz, A., Peekema, A., Jones, M., Hurst, J.

{IEEE Transactions on Robotics and Automation}, 31(5):1244-1251, IEEE, New York, NY, 2015 (article)

Abstract
A common approach in designing legged robots is to build fully actuated machines and control the machine dynamics entirely in soft- ware, carefully avoiding impacts and expending a lot of energy. However, these machines are outperformed by their human and animal counterparts. Animals achieve their impressive agility, efficiency, and robustness through a close integration of passive dynamics, implemented through mechanical components, and neural control. Robots can benefit from this same integrated approach, but a strong theoretical framework is required to design the passive dynamics of a machine and exploit them for control. For this framework, we use a bipedal spring–mass model, which has been shown to approximate the dynamics of human locomotion. This paper reports the first implementation of spring–mass walking on a bipedal robot. We present the use of template dynamics as a control objective exploiting the engineered passive spring–mass dynamics of the ATRIAS robot. The results highlight the benefits of combining passive dynamics with dynamics-based control and open up a library of spring–mass model-based control strategies for dynamic gait control of robots.

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link (url) DOI Project Page [BibTex]

link (url) DOI Project Page [BibTex]


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Frenetic aspects of second order response

Basu, U., Krüger, M., Lazarescu, A., Maes, C.

{Physical Chemistry Chemical Physics}, 17(9):6653-6666, Royal Society of Chemistry, Cambridge, England, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Lab-in-a-tube systems as ultra-compact devices

Sanchez, S.

{Lab chip}, (3):610-613, 2015 (article)

Abstract
{In this Focus article, I will give an overview on the current and future interests of our multidisciplinary research group. One of our main interests is to develop highly integrated on-chip components towards ultra-compact devices for biosensing technologies (lab-in-a-tube). Our other activities are focused in developing self-powered devices that can generate either motion of a fluid or autonomous propulsion. We are particularly interested in three-dimensional (3D) nanofabrication technologies and stimuli responsive soft materials.}

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces in the presence of random surface fields

Maciolek, A., Vasilyev, O., Dotsenko, V., Dietrich, S.

{Physical Review E}, 91(3), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Catalytic Mesoporous Janus Nanomotors for Active Cargo Delivery

Ma, X., Hahn, K., Sanchez, S.

{Journal of the American Chemical Society}, 137(15):4976-4979, ACS Publications, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Guest Editorial: Special Issue: Micro- and Nanomachines

Paxton, W., Sanchez, S., Nitta, T.

{IEEE Transactions on Nanobioscience}, 14(3):258-259, IEEE, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Self-Assembly via Microfluidics

Wang, L., Sanchez, S.

{Lab on a Chip}, 15(23):4383-4386, Royal Society of Chemistry, Cambridge, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Operator Formalism for Topology-Conserving Crossing Dynamics in Planar Knot Diagrams

Rohwer, C. M., Müller-Nedebock, K. K.

{Journal of Statistical Physics}, 159(1):120-157, Kluwer Academic Publishers [etc.], New York, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Nonequilibrium interfacial tension during relaxation

Bier, M.

{Physical Review E}, 92(4), American Physical Society, Melville, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Probabilistic numerics and uncertainty in computations

Hennig, P., Osborne, M. A., Girolami, M.

Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences, 471(2179), 2015 (article)

Abstract
We deliver a call to arms for probabilistic numerical methods: algorithms for numerical tasks, including linear algebra, integration, optimization and solving differential equations, that return uncertainties in their calculations. Such uncertainties, arising from the loss of precision induced by numerical calculation with limited time or hardware, are important for much contemporary science and industry. Within applications such as climate science and astrophysics, the need to make decisions on the basis of computations with large and complex data have led to a renewed focus on the management of numerical uncertainty. We describe how several seminal classic numerical methods can be interpreted naturally as probabilistic inference. We then show that the probabilistic view suggests new algorithms that can flexibly be adapted to suit application specifics, while delivering improved empirical performance. We provide concrete illustrations of the benefits of probabilistic numeric algorithms on real scientific problems from astrometry and astronomical imaging, while highlighting open problems with these new algorithms. Finally, we describe how probabilistic numerical methods provide a coherent framework for identifying the uncertainty in calculations performed with a combination of numerical algorithms (e.g. both numerical optimizers and differential equation solvers), potentially allowing the diagnosis (and control) of error sources in computations.

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PDF DOI [BibTex]

PDF DOI [BibTex]


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Mass and galaxy distributions of four massive galaxy clusters from Dark Energy Survey Science Verification data

Melchior, P., Suchyta, E., Huff, E., Hirsch, M., Kacprzak, T., Rykoff, E., Gruen, D., Armstrong, R., Bacon, D., Bechtol, K., others,

Monthly Notices of the Royal Astronomical Society, 449(3):2219-2238, Oxford University Press, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Enhanced wavelength-dependent surface tension of liquid-vapour interfaces

Höfling, F., Dietrich, S.

{EPL}, 109(4), 2015 (article)

Abstract
{Due to the simultaneous presence of bulk-like and interfacial fluctuations the understanding of the structure of liquid-vapour interfaces poses a long-lasting and ongoing challenge for experiments, theory, and simulations. We provide a new analysis of this topic by combining high-quality simulation data for Lennard-Jones fluids with an unambiguous definition of the wave-number\textendashdependent surface tension \gamma(t) based on the two-point correlation function of the fluid. Upon raising the temperature, \gamma(t) develops a maximum at short wavelengths. We compare these results with predictions from density functional theory. Our analysis has repercussions for the interpretation of grazing-incidence small-angle X-ray scattering (GISAXS) at liquid interfaces.}

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DOI [BibTex]


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Wetting Transitions in Terms of Effective Potentials

Napiorkowski, M., Dietrich, S.

{Physical Review Letters}, 114(3), American Physical Society, Woodbury, N.Y., 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Bioprinting of 3D hydrogels

Stanton, M. M., Samitier, J., Sanchez, S.

{Lab on a Chip}, 15(15):3111-3115, Royal Society of Chemistry, Cambridge, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Surface Conductive Graphene-Wrapped Micromotors Exhibiting Enhanced Motion

Ma, X., Katuri, J., Zeng, Y., Zhao, Y., Sanchez, S.

{ACS Nano}, 11(38):5023-5027, American Chemical Society, Washington, DC, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Dimensionality of Rolled-up Nanomembranes Controls Neural Stem Cell Migration Mechanism

Koch, B., Meyer, A. K., Helbing, L., Harazim, S. M., Storch, A., Sanchez, S., Schmidt, O. G.

{Nano Letters}, 15(8):5530-5538, American Chemical Society, Washington, DC, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces for a particle between two planar walls

Vasilyev, O., Maciolek, A.

{Journal of Non-Crystalline Solids}, 407, pages: 376-383, North-Holland, Amsterdam, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Microfluidic-Assisted Fabrication of Flexible and Location Traceable Organo-Motor

Seo, K. D., Kwak, B. K., Sanchez, S., Kim, D. S.

{IEEE Transactions on Nanobioscience}, 14(3):298-304, IEEE, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Kinematic and gait similarities between crawling human infants and other quadruped mammals

Righetti, L., Nylen, A., Rosander, K., Ijspeert, A.

Frontiers in Neurology, 6(17), February 2015 (article)

Abstract
Crawling on hands and knees is an early pattern of human infant locomotion, which offers an interesting way of studying quadrupedalism in one of its simplest form. We investigate how crawling human infants compare to other quadruped mammals, especially primates. We present quantitative data on both the gait and kinematics of seven 10-month-old crawling infants. Body movements were measured with an optoelectronic system giving precise data on 3-dimensional limb movements. Crawling on hands and knees is very similar to the locomotion of non-human primates in terms of the quite protracted arm at touch-down, the coordination between the spine movements in the lateral plane and the limbs, the relatively extended limbs during locomotion and the strong correlation between stance duration and speed of locomotion. However, there are important differences compared to primates, such as the choice of a lateral-sequence walking gait, which is similar to most non-primate mammals and the relatively stiff elbows during stance as opposed to the quite compliant gaits of primates. These finding raise the question of the role of both the mechanical structure of the body and neural control on the determination of these characteristics.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Time-resolved imaging of pulse-induced magnetization reversal with a microwave assist field

Rao, S., Rhensius, J., Bisig, A., Mawass, M.-A., Weigand, M., Kläui, M., Bhatia, C. S., Yang, H.

{Scientific Reports}, 5, Nature Publishing Group, London, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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XMCD studies of thin Co films on BaTiO3

Welke, M., Gräfe, J., Govind, R. K., Babu, V. H., Trautmann, M., Schindler, K., Denecke, R.

{Journal of Physics: Condensed Matter}, 27(32), IOP Publishing, Bristol, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Low temperature X-ray imaging of magnetic flux patterns in high temperature superconductors

Stahl, C., Ruoß, S., Weigand, M., Bechtel, M., Schütz, G., Albrecht, J.

{Journal of Applied Physics}, 117(17), AIP Publishing, New York, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Formation of a quasi-solid structure by intercalated noble gas atoms in pores of CuI-MFU-4l metal-organic framework

Magdysyuk, O. V., Denysenko, D., Weinrauch, I., Volkmer, D., Hirscher, M., Dinnebier, R. E.

{Chemical Communications}, 51(4):714-717, Royal Society of Chemistry, Cambridge, UK, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Burst-mode manipulation of magnonic vortex crystals

Hänze, M., Adolff, C. F., Weigand, M., Meier, G.

{Physical Review B}, 91(10), American Physical Society, Woodbury, NY, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Entropic Movement Complexity Reflects Subjective Creativity Rankings of Visualized Hand Motion Trajectories

Peng, Z, Braun, DA

Frontiers in Psychology, 6(1879):1-13, December 2015 (article)

Abstract
In a previous study we have shown that human motion trajectories can be characterized by translating continuous trajectories into symbol sequences with well-defined complexity measures. Here we test the hypothesis that the motion complexity individuals generate in their movements might be correlated to the degree of creativity assigned by a human observer to the visualized motion trajectories. We asked participants to generate 55 novel hand movement patterns in virtual reality, where each pattern had to be repeated 10 times in a row to ensure reproducibility. This allowed us to estimate a probability distribution over trajectories for each pattern. We assessed motion complexity not only by the previously proposed complexity measures on symbolic sequences, but we also propose two novel complexity measures that can be directly applied to the distributions over trajectories based on the frameworks of Gaussian Processes and Probabilistic Movement Primitives. In contrast to previous studies, these new methods allow computing complexities of individual motion patterns from very few sample trajectories. We compared the different complexity measures to how a group of independent jurors rank ordered the recorded motion trajectories according to their personal creativity judgment. We found three entropic complexity measures that correlate significantly with human creativity judgment and discuss differences between the measures. We also test whether these complexity measures correlate with individual creativity in divergent thinking tasks, but do not find any consistent correlation. Our results suggest that entropic complexity measures of hand motion may reveal domain-specific individual differences in kinesthetic creativity.

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DOI [BibTex]

DOI [BibTex]


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Bounded rationality, abstraction and hierarchical decision-making: an information-theoretic optimality principle

Genewein, T, Leibfried, F, Grau-Moya, J, Braun, DA

Frontiers in Robotics and AI, 2(27):1-24, October 2015 (article)

Abstract
Abstraction and hierarchical information-processing are hallmarks of human and animal intelligence underlying the unrivaled flexibility of behavior in biological systems. Achieving such a flexibility in artificial systems is challenging, even with more and more computational power. Here we investigate the hypothesis that abstraction and hierarchical information-processing might in fact be the consequence of limitations in information-processing power. In particular, we study an information-theoretic framework of bounded rational decision-making that trades off utility maximization against information-processing costs. We apply the basic principle of this framework to perception-action systems with multiple information-processing nodes and derive bounded optimal solutions. We show how the formation of abstractions and decision-making hierarchies depends on information-processing costs. We illustrate the theoretical ideas with example simulations and conclude by formalizing a mathematically unifying optimization principle that could potentially be extended to more complex systems.

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DOI [BibTex]

DOI [BibTex]


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Fabrication and X-ray testing of true kinoform lenses with high efficiencies

Keskinbora, K., Sanli, U., Grévent, C., Schütz, G.

{Proceedings of SPIE}, 9592, SPIE, Bellingham, Washington, 2015 (article)

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DOI [BibTex]

DOI [BibTex]


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Signaling equilibria in sensorimotor interactions

Leibfried, F, Grau-Moya, J, Braun, DA

Cognition, 141, pages: 73-86, August 2015 (article)

Abstract
Although complex forms of communication like human language are often assumed to have evolved out of more simple forms of sensorimotor signaling, less attention has been devoted to investigate the latter. Here, we study communicative sensorimotor behavior of humans in a two-person joint motor task where each player controls one dimension of a planar motion. We designed this joint task as a game where one player (the sender) possesses private information about a hidden target the other player (the receiver) wants to know about, and where the sender's actions are costly signals that influence the receiver's control strategy. We developed a game-theoretic model within the framework of signaling games to investigate whether subjects' behavior could be adequately described by the corresponding equilibrium solutions. The model predicts both separating and pooling equilibria, in which signaling does and does not occur respectively. We observed both kinds of equilibria in subjects and found that, in line with model predictions, the propensity of signaling decreased with increasing signaling costs and decreasing uncertainty on the part of the receiver. Our study demonstrates that signaling games, which have previously been applied to economic decision-making and animal communication, provide a framework for human signaling behavior arising during sensorimotor interactions in continuous and dynamic environments.

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DOI [BibTex]

DOI [BibTex]