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  1. AU="Hansen, Alex"
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  1. Book ; Online: Physics of Porous Media

    Bedeaux, Dick / Flekkøy, Eirik G. / Hansen, Alex / Kjelstrup, Signe / Jørgen Måløy, Knut / Torsaeter, Ole

    2020  

    Keywords Science: general issues ; Physics ; flow in porous media ; two-phase flow in porous media ; non-Newtonian fluids ; reactive fluids ; electrohydrodynamics (EHD) ; capillary fiber bundle model ; soil mechanics ; thermodynamics of small systems
    Size 1 electronic resource (174 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021230133
    ISBN 9782889635351 ; 288963535X
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Book ; Online: Frontiers in Physics - 2019 Editor's Choice

    Hansen, Alex / Beyer, Thomas / Moser, Ewald / Elisa Marcucci, Laura / Metzler, Ralf / Klingenberg, Christian F. / Sauls, James / Valle, José W. F. / De Boer, Jan / Baleanu, Dumitru / Pavesi, Lorenzo / Friedrich, Bretislav / Charles, Christine / Perc, Matjaž / Van Der Gucht, Jasper

    2020  

    Keywords Science: general issues ; Physics ; biophysics ; mathematical physics ; medical physics ; nuclear physics ; physical chemistry ; plasma physics ; social physics ; soft matter physics ; optics ; particle physics
    Size 1 electronic resource (186 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021230006
    ISBN 9782889637096 ; 2889637093
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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    Order via subito

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  3. Article ; Online: Hyper-Ballistic Superdiffusion of Competing Microswimmers.

    Olsen, Kristian Stølevik / Hansen, Alex / Flekkøy, Eirik Grude

    Entropy (Basel, Switzerland)

    2024  Volume 26, Issue 3

    Abstract: Hyper-ballistic diffusion is shown to arise from a simple model of microswimmers moving through a porous media while competing for resources. By using a mean-field model where swimmers interact through the local concentration, we show that a non-linear ... ...

    Abstract Hyper-ballistic diffusion is shown to arise from a simple model of microswimmers moving through a porous media while competing for resources. By using a mean-field model where swimmers interact through the local concentration, we show that a non-linear Fokker-Planck equation arises. The solution exhibits hyper-ballistic superdiffusive motion, with a diffusion exponent of four. A microscopic simulation strategy is proposed, which shows excellent agreement with theoretical analysis.
    Language English
    Publishing date 2024-03-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2014734-X
    ISSN 1099-4300 ; 1099-4300
    ISSN (online) 1099-4300
    ISSN 1099-4300
    DOI 10.3390/e26030274
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Evaluating Autonomous Urban Perception and Planning in a 1/10th Scale MiniCity.

    Buckman, Noam / Hansen, Alex / Karaman, Sertac / Rus, Daniela

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 18

    Abstract: We present the MiniCity, a multi-vehicle evaluation platform for testing perception hardware and software for autonomous vehicles. The MiniCity is a 1/10th scale city consisting of realistic urban scenery, intersections, and multiple fully autonomous 1/ ... ...

    Abstract We present the MiniCity, a multi-vehicle evaluation platform for testing perception hardware and software for autonomous vehicles. The MiniCity is a 1/10th scale city consisting of realistic urban scenery, intersections, and multiple fully autonomous 1/10th scale vehicles with state-of-the-art sensors and algorithms. The MiniCity is used to evaluate and test perception algorithms both upstream and downstream in the autonomy stack, in urban driving scenarios such as occluded intersections and avoiding multiple vehicles. We demonstrate the MiniCity's ability to evaluate different sensor and algorithm configurations for perception tasks such as object detection and localization. For both tasks, the MiniCity platform is used to evaluate the task itself (accuracy in estimating obstacle pose and ego pose in the map) as well as the downstream performance in collision avoidance and lane following, respectively.
    MeSH term(s) Algorithms ; Automobile Driving ; Perception
    Language English
    Publishing date 2022-09-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22186793
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Prediction of hypofibrinogenaemia based on the starting fibrinogen and extent of haemodilution during cardiac surgery.

    Gibbs, Neville M / Preuss, James F / Matzelle, Shannon A / Hansen, Alex / Weightman, William M

    Anaesthesia and intensive care

    2023  Volume 51, Issue 3, Page(s) 219–222

    MeSH term(s) Humans ; Afibrinogenemia ; Fibrinogen ; Hemodilution ; Cardiac Surgical Procedures
    Chemical Substances Fibrinogen (9001-32-5)
    Language English
    Publishing date 2023-02-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 187524-3
    ISSN 1448-0271 ; 0310-057X
    ISSN (online) 1448-0271
    ISSN 0310-057X
    DOI 10.1177/0310057X221138113
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1017: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

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  6. Book ; Online: Frontiers in Physics - 2017 & 2018 Editor's choice

    Beyer, Thomas / Moser, Ewald / Heermann, Dieter W. / Klingenberg, Christian F. / Sauls, James / Valle, José W. F. / de Boer, Jan / Elizalde, Emilio / Baleanu, Dumitru / Hansen, Alex / Fang, Nicholas X. / Pavesi, Lorenzo / Friedrich, Bretislav / Charles, Christine / Perc, Matjaž / Van Der Gucht, Jasper / von Steiger, Rudolf / Bogazzi, Claudio

    2019  

    Keywords Science: general issues ; Physics ; biomedical physics ; Biophysics ; Computational Physics ; High-Energy and Astroparticle Physics ; Interdisciplinary Physics ; mathematical physics ; Space Physics
    Size 1 electronic resource (190 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021229845
    ISBN 9782889458042 ; 2889458040
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Article ; Online: Aging and Failure of a Polymer Chain under Tension.

    Charan, Harish / Hansen, Alex / Hentschel, H G E / Procaccia, Itamar

    Physical review letters

    2021  Volume 126, Issue 8, Page(s) 85501

    Abstract: The rupture of a polymer chain maintained at temperature T under fixed tension is prototypical to a wide array of systems failing under constant external stress and random perturbations. Past research focused on analytic and numerical studies of the mean ...

    Abstract The rupture of a polymer chain maintained at temperature T under fixed tension is prototypical to a wide array of systems failing under constant external stress and random perturbations. Past research focused on analytic and numerical studies of the mean rate of collapse of such a chain. Surprisingly, an analytic calculation of the probability distribution function (PDF) of collapse rates appears to be lacking. Since rare events of rapid collapse can be important and even catastrophic, we present here a theory of this distribution, with a stress on its tail of fast rates. We show that the tail of the PDF is a power law with a universal exponent that is theoretically determined. Extensive numerics validate the offered theory. Lessons pertaining to other problems of the same type are drawn.
    Language English
    Publishing date 2021-03-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.085501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

    Order via subito

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  8. Article ; Online: Darcy's law of yield stress fluids on a treelike network.

    Schimmenti, Vincenzo Maria / Lanza, Federico / Hansen, Alex / Franz, Silvio / Rosso, Alberto / Talon, Laurent / De Luca, Andrea

    Physical review. E

    2023  Volume 108, Issue 2, Page(s) L023102

    Abstract: Understanding the flow of yield stress fluids in porous media is a major challenge. In particular, experiments and extensive numerical simulations report a nonlinear Darcy law as a function of the pressure gradient. In this letter we consider a treelike ... ...

    Abstract Understanding the flow of yield stress fluids in porous media is a major challenge. In particular, experiments and extensive numerical simulations report a nonlinear Darcy law as a function of the pressure gradient. In this letter we consider a treelike porous structure for which the problem of the flow can be resolved exactly due to a mapping with the directed polymer (DP) with disordered bond energies on the Cayley tree. Our results confirm the nonlinear behavior of the flow and expresses its full pressure dependence via the density of low-energy paths of DP restricted to vanishing overlap. These universal predictions are confirmed by extensive numerical simulations.
    Language English
    Publishing date 2023-09-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.L023102
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Book ; Online: Crack Localization and the Interplay between Stress Enhancement and Thermal Noise

    Sinha, Santanu / Roy, Subhadeep / Hansen, Alex

    2020  

    Abstract: We study the competition between thermal fluctuations and stress enhancement in the failure process of a disordered system by using a local load sharing fiber bundle model. The thermal noise is introduced by defining a failure probability that ... ...

    Abstract We study the competition between thermal fluctuations and stress enhancement in the failure process of a disordered system by using a local load sharing fiber bundle model. The thermal noise is introduced by defining a failure probability that constitutes the temperature and elastic energy of the fibers. We observe that at a finite temperature and low disorder strength, the failure process, which nucleate in the absence of any thermal fluctuation, becomes spatially uncorrelated when the applied stress is sufficiently low. The dynamics of the model in this limit lies closely to the universality class of ordinary percolation. When applied stress is increased beyond a threshold value, localized fractures appear in the system that grow with time. We identify the boundary between the localized and random failure process in the space of temperature and applied stress, and find that the threshold of stress corresponding to the onset of localized crack growth increases with the increase of temperature.

    Comment: 11 pages, 8 figures
    Keywords Condensed Matter - Disordered Systems and Neural Networks ; Condensed Matter - Statistical Mechanics
    Subject code 612
    Publishing date 2020-10-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  10. Book ; Online: Phase transitions and correlations in fracture processes where disorder and stress compete

    Sinha, Santanu / Roy, Subhadeep / Hansen, Alex

    2020  

    Abstract: We study the effect of the competition between disorder and stress enhancement in fracture processes using the local load sharing fiber bundle model, a model that hovers on the border between analytical tractability and numerical accessibility. We ... ...

    Abstract We study the effect of the competition between disorder and stress enhancement in fracture processes using the local load sharing fiber bundle model, a model that hovers on the border between analytical tractability and numerical accessibility. We implement a disorder distribution with one adjustable parameter. The model undergoes a localization transition as a function of this parameter. We identify an order parameter for this transition and find that the system is in the localized phase over a finite range of values of the parameter bounded by a transition to the non-localized phase on both sides. The transition is first order at the lower transition and second order at the upper transition. The critical exponents characterizing the second order transition are close to those characterizing the percolation transition. We determine the spatiotemporal correlation function in the localized phase. It is characterized by two power laws as in invasion percolation. We find exponents that are consistent with the values found in that problem.

    Comment: 8 pages, 5 figures
    Keywords Condensed Matter - Disordered Systems and Neural Networks ; Condensed Matter - Soft Condensed Matter
    Subject code 612
    Publishing date 2020-05-23
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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