Header logo is


2013


Quasi-Newton Methods: A New Direction
Quasi-Newton Methods: A New Direction

Hennig, P., Kiefel, M.

Journal of Machine Learning Research, 14(1):843-865, March 2013 (article)

Abstract
Four decades after their invention, quasi-Newton methods are still state of the art in unconstrained numerical optimization. Although not usually interpreted thus, these are learning algorithms that fit a local quadratic approximation to the objective function. We show that many, including the most popular, quasi-Newton methods can be interpreted as approximations of Bayesian linear regression under varying prior assumptions. This new notion elucidates some shortcomings of classical algorithms, and lights the way to a novel nonparametric quasi-Newton method, which is able to make more efficient use of available information at computational cost similar to its predecessors.

ei ps pn

website+code pdf link (url) [BibTex]

2013


website+code pdf link (url) [BibTex]


no image
Analytical probabilistic modeling for radiation therapy treatment planning

Bangert, M., Hennig, P., Oelfke, U.

Physics in Medicine and Biology, 58(16):5401-5419, 2013 (article)

ei pn

PDF DOI [BibTex]

PDF DOI [BibTex]


no image
Self-Propelled Micromotors for Cleaning Polluted Watter

Soler, L., Magdanz, V., Fomin, V. M., Sanchez, S., Schmidt, O. G.

ACS Nano, 11, pages: 9611-9620, American Chemical Society, Washington, DC, 2013 (article)

Abstract
We describe the use of catalytically self-propelled microjets (dubbed micromotors) for degrading organic pollutants in water via the Fenton oxidation process. The tubular micromotors are composed of rolled-up functional nanomembranes consisting of Fe/Pt bilayers. The micromotors contain double functionality within their architecture, i.e., the inner Pt for the self-propulsion and the outer Fe for the in situ generation of ferrous ions boosting the remediation of contaminated water.The degradation of organic pollutants takes place in the presence of hydrogen peroxide, which acts as a reagent for the Fenton reaction and as main fuel to propel the micromotors. Factors influencing the efficiency of the Fenton oxidation process, including thickness of the Fe layer, pH, and concentration of hydrogen peroxide, are investigated. The ability of these catalytically self-propelled micromotors to improve intermixing in liquids results in the removal of organic pollutants ca. 12 times faster than when the Fenton oxidation process is carried out without catalytically active micromotors. The enhanced reaction\textendashdiffusion provided by micromotors has been theoretically modeled. The synergy between the internal and external functionalities of the micromotors, without the need of further functionalization, results into an enhanced degradation of nonbiodegradable and dangerous organic pollutants at small-scale environments and holds considerable promise for the remediation of contaminated water.

icm

DOI [BibTex]

DOI [BibTex]


no image
Stability of thin liquid films and sessile droplets under confinement

Dörfler, F., Rauscher, M., Dietrich, S.

Physical Review E, 88(1), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Nonequilibrium interfaces in colloidal fluids

Bier, M., Arnold, D.

Physical Review E, 88(6), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Colloidal particles at fluid interfaces: Effective interactions, dynamics and a gravitation\textendashlike instability

Bleibel, J., Dom\’\inguez, A., Oettel, M.

The European Physical Journal Special Topics, 222(11):3071-3087, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Anomalous transport in the crowded world of biological cells

Höfling, Felix, Franosch, Thomas

Reports on Progress in Physics, 76(4), IOP Pub., London, 2013, author: Höfling, Felix (article)

icm

link (url) DOI [BibTex]

link (url) DOI [BibTex]


no image
Flow pattern in the vicinity of self-propelling hot Janus particles

Bickel, T., Majee, A., Würger, A.

Physical Review E, 88(1), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Nonequilibrium Critical Casimir Effect in Binary Fluids

Furukawa, A., Gambassi, A., Dietrich, S., Tanaka, H.

Physical Review Letters, 111(5), American Physical Society, Woodbury, N.Y., 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Many-body effects for critical Casimir forces

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

The Journal of Chemical Physics, 138(7), 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Propulsion Mechanism of Catalytic Microjet Engines

Magdanz, V., Fomin, V. M., Soler, L., Sanchez, S., Schmidt, O. G., Hippler, M.

IEEE Transactions on Robotics and Automation, pages: 40-48, IEEE, New York, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Impedance spectroscopy of ions at liquid-liquid interfaces

Bier, M., Reindl, A.

Physical Review E, 88(5), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Precursors of order in aggregates of patchy particles

Vasilyev, O., Klumov, B. A., Tkachenko, A. V.

Physical Review E, 88(1), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Two-temperature Langevin dynamics in a parabolic potential

Dotsenko, V., Maciolek, Anna, Vasilyev, O., Oshanin, G.

Physical Review E, 87(6), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Critical Casimir forces between homogeneous and chemically striped surfaces

Parisen Toldin, F., Tröndle, M., Dietrich, S.

Physical Review E, 88, American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Comparison between theory and simulations for the magnetization and the susceptibility of polydisperse ferrofluids

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

Journal of Physics: Condensed Matter, 25(46), IOP Pub., Bristol, UK, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Thermal activation of catalytic microjets in blood samples using microfluidic chips.

Soler, L., Mart\’\inez-Cisneros, C., Swiersy, A., Sanchez, S., Schmidt, O. G.

Lab on a Chip, 13, pages: 4299-4303, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Nematic liquid crystal boojums with handles on colloidal handlebodies

Liu, Q. K., Senyuk, B., Tasinkevych, M., Smalyukh, I. I.

Proceedings of the National Academy of Sciences of the United States of America, 110(23):9231-9236, National Academy of Sciences, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Critical Casimir torques and forces acting on needles in two spatial dimensions

Vasilyev, Oleg, Eisenriegler, E., Dietrich, Siegfried

Physical Review E, 88(1), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Critical Casimir forces along the isofields

Zubaszewska, M., Maciolek, A., Drzewinski, A.

Physical Review E, 88(5), American Physical Society, Melville, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Surface states and the Casimir interaction in the Ising model

Abraham, D. B., Maciolek, A.

Europhysics letters, 101(2), Editrice Compositori., Bologna, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Crystallization, structural diversity, and anisotropy effects in 2D arrays of icosahedral viruses

Fukuto, M., Nguyen, Q. L., Vasilyev, O., Mank, N., Washington-Huges, C. L., Kuzmenko, I., Checco, A., Mao, Y., Wang, Q., Yang, L.

Soft Matter, 9(40):9633-9642, Royal Society of Chemistry, Cambridge, UK, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Dynamic arrest in model porous media-intermediate scattering functions

Spanner, Markus, Schnyder, Simon K., Höfling, Felix, Voigtmann, Thomas, Franosch, Thomas

Soft Matter, 9(5):1604-1611, Royal Society of Chemistry, Cambridge, UK, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Linear response relations in fluctuational electrodynamics

Golyk, V. A., Krüger, Matthias, Kardar, M.

Physical Review B, 88(15), American Physical Society, Woodbury, NY, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Ideal Polyethylene Nanocrystals

Osichov, A., Rabe, C., Vogtt, K., Narayanan, T., Harnau, Ludger, Drechsler, M., Ballauff, M.

Journal of the American Chemical Society, 135(31):11645-11650, American Chemical Society, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Self-Assembly of Two-Dimensional Colloidal Clusters by Tuning the Hydrophobicity, Composition, and Packing Geometry

Law, A. D., Auriol, M., Smith, D., Horozov, T. S., Buzza, D. M. A.

Physical Review Letters, 110, American Physical Society., Woodbury, N.Y., etc., 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Geometry-Induced Superdiffusion in Driven Crowded Systems

Bénichou, O., Bodrova, A., Chakraborty, D., Illien, P., Law, A. D., Mej\’\ia-Monasterio, C., Oshanin, G., Voituriez, R.

Physical Review Letters, 111(26), American Physical Society, Woodbury, N.Y., 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Overshoots in stress-strain curves: Colloid experiments and schematic mode coupling theory

Amann, Christian P, Siebenbürger, Miriam, Krüger, Matthias, Weysser, Fabian, Ballauff, Matthias, Fuchs, Matthias

Journal of Rheology, 57, pages: 149-175, 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Wetting in electrolyte solutions

Ibagon, Ingrid, Bier, Markus, Dietrich, Siegfried

The Journal of Chemical Physics, 138(21), American Institute of Physics, Woodbury, N.Y., 2013 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Information Driven Self-Organization of Complex Robotic Behaviors

Martius, G., Der, R., Ay, N.

PLoS ONE, 8(5):e63400, Public Library of Science, 2013 (article)

al

link (url) DOI [BibTex]

link (url) DOI [BibTex]


no image
Linear combination of one-step predictive information with an external reward in an episodic policy gradient setting: a critical analysis

Zahedi, K., Martius, G., Ay, N.

Frontiers in Psychology, 4(801), 2013 (article)

Abstract
One of the main challenges in the field of embodied artificial intelligence is the open-ended autonomous learning of complex behaviours. Our approach is to use task-independent, information-driven intrinsic motivation(s) to support task-dependent learning. The work presented here is a preliminary step in which we investigate the predictive information (the mutual information of the past and future of the sensor stream) as an intrinsic drive, ideally supporting any kind of task acquisition. Previous experiments have shown that the predictive information (PI) is a good candidate to support autonomous, open-ended learning of complex behaviours, because a maximisation of the PI corresponds to an exploration of morphology- and environment-dependent behavioural regularities. The idea is that these regularities can then be exploited in order to solve any given task. Three different experiments are presented and their results lead to the conclusion that the linear combination of the one-step PI with an external reward function is not generally recommended in an episodic policy gradient setting. Only for hard tasks a great speed-up can be achieved at the cost of an asymptotic performance lost.

al

link (url) DOI [BibTex]


no image
Robustness of guided self-organization against sensorimotor disruptions

Martius, G.

Advances in Complex Systems, 16(02n03):1350001, 2013 (article)

Abstract
Self-organizing processes are crucial for the development of living beings. Practical applications in robots may benefit from the self-organization of behavior, e.g.~to increase fault tolerance and enhance flexibility, provided that external goals can also be achieved. We present results on the guidance of self-organizing control by visual target stimuli and show a remarkable robustness to sensorimotor disruptions. In a proof of concept study an autonomous wheeled robot is learning an object finding and ball-pushing task from scratch within a few minutes in continuous domains. The robustness is demonstrated by the rapid recovery of the performance after severe changes of the sensor configuration.

al

DOI [BibTex]

DOI [BibTex]

2008


no image
Size dependent motion of nanodroplets on chemical steps

Moosavi, A., Rauscher, M., Dietrich, S.

Journal of Chemical Physics, 129(4), 2008 (article)

icm

link (url) DOI [BibTex]

2008


link (url) DOI [BibTex]


no image
Magnetization and susceptibility of ferrofluids

Szalai, I., Dietrich, S.

Journal of Physics: Condensed Matter, 20(20), 2008 (article)

icm

[BibTex]

[BibTex]


no image
Polymer nanofibers via nozzle-free centrifugal spinning

Weitz, R. T., Harnau, L., Rauschenbach, S., Burghard, M., Kern, K.

Nano Letters, 8, pages: 1187-1191, 2008 (article)

icm

[BibTex]

[BibTex]


no image
Colloids dragged through a polymer solution: experiment, theory, and simulation

Gutsche, C., Kremer, F., Krüger, M., Rauscher, M., Weeber, R., Harting, J.

Journal of Chemical Physics, 129(8), 2008 (article)

icm

link (url) DOI [BibTex]

link (url) DOI [BibTex]


no image
The non-equilibrium response of the critical Ising model: universal scaling properties and local scale invariance

Corberi, F., Gambassi, A., Lippiello, E., Zannetti, M.

Journal of Statistical Mechanics: Theory and Experiment, 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
The influence of non-locality on fluctuation effects for 3D short-ranged wetting

Parry, A. O., Romero-Enrique, J. M., Bernardino, N. R., Rascon, C.

Journal of Physics: Condensed Matter, 20(50), 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Universal dependence on disorder of 2D randomly diluted and random-bond +/-J Ising models.

Hasenbusch, M., Parisen Toldin, F., Pelissetto, A., Vicari, E.

Physical Review E, 78(1), 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Effect of contact angle hysteresis on the measurement of capillary forces

De Souza, E. J., Gao, L., McCarthy, T. J., Arzt, E., Crosby, A. J.

Langmuir, 24(4):1391-1396, 2008 (article)

icm

[BibTex]

[BibTex]


no image
Direct measurement of critical Casimir forces

Hertlein, C., Helden, L., Gambassi, A., Dietrich, S., Bechinger, C.

Nature, 451, pages: 172-175, 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Effective Hamiltonian for fluid membranes in the presence of long-range forces

Dutka, F., Napiorkowski, M., Dietrich, S.

Physical Review E, 78(2), 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Lock and key model system

König, P., Roth, R., Dietrich, S.

Europhysics Letters, 84(06), 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Colloidal interactions at fluid interfaces

Oettel, M., Dietrich, S.

Langmuir, 24(4):1425-1441, 2008 (article)

icm

[BibTex]

[BibTex]


no image
Spinodal dewetting of thin films with large interfacial slip: implications from the dispersion relation

Rauscher, M., Blossey, R., Münch, A., Wagner, B.

Langmuir, 24(21):12290-12294, 2008 (article)

icm

link (url) DOI [BibTex]

link (url) DOI [BibTex]


no image
Multicritical Nishimori point in the phase diagram of the +/-J Ising model on a square lattice

Hasenbusch, M., Parisen Toldin, F., Pelissetto, A., Vicari, E.

Physical Review E, 77(5), 2008 (article)

icm

DOI [BibTex]

DOI [BibTex]


no image
Stimuli-responsive particles: synthesis and characterization of dumbbell-shaped polyelectrolyte brush particles

Hoffmann, M., Lu, Y. S., Schrinner, M., Ballauff, M., Harnau, L.

Polymeric Materials: Science \& Engineering, 99, pages: 216-217, 2008 (article)

icm

[BibTex]

[BibTex]


no image
Dumbbell-shaped polyelectrolyte brushes studied by depolarized dynamic light scattering

Hoffmann, M., Lu, Y., Schrinner, M., Ballauff, M., Harnau, L.

Journal of Physical Chemistry B, 112, pages: 14843-14850, 2008 (article)

icm

[BibTex]

[BibTex]


no image
Stability of liquid ridges on chemical micro- and nanostripes

Mechkov, S., Rauscher, M., Dietrich, S.

Physical Review E, 77(6), 2008 (article)

Abstract
{10 pages}

icm

link (url) DOI [BibTex]

link (url) DOI [BibTex]