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Enhanced sensitivity and tunability of thermomechanical resonance near the buckling bifurcation

Liu, Hanqing (author), Baglioni, G. (author), Boix-Constant, Carla (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Verbiest, G.J. (author)

The high susceptibility of ultrathin two-dimensional (2D) material resonators to force and temperature makes them ideal systems for sensing applications and exploring thermomechanical coupling. Although the dynamics of these systems at high stress has been thoroughly investigated, their behavior near the buckling transition has received less...

journal article 2024

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Semicentennial Response of a Bifurcation Region in an Engineered River to Peak Flows and Human Interventions

Chowdhury, M. Kifayath (author), Blom, A. (author), Ylla Arbos, C. (author), Verbeek, Merel C. (author), Schropp, Max H.I. (author), Schielen, R.M.J. (author)

A bifurcation in an engineered river system (i.e., fixed planform and width) has fewer degrees of freedom in its response to interventions and natural changes than a natural bifurcation system. Our objective is to provide insight into how a bifurcation in an engineered river responds to peak flows and human interventions. To this end, we analyze...

journal article 2023

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Floodplain Connecting Channels as Critical Paths for Hydrological Connectivity of Deltaic River Networks

Gao, Weilun (author), Wang, Zhengbing (author), Kleinhans, Maarten G. (author), Miao, Chiyuan (author), Cui, Baoshan (author), Shao, Dongdong (author)

A river bifurcation is critical for distributing water, sediment and nutrients to the downstream branches of deltaic river networks. However, the downstream branches of a bifurcation can be linked by a connecting channel cutting through deltaic floodplains. The floodplain connecting channel as a downstream control can affect water...

journal article 2023

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Deep reinforcement learning for cerebral anterior vessel tree extraction from 3D CTA images

Su, Jiahang (author), Li, Shuai (author), Wolff, Lennard (author), van Zwam, Wim (author), Niessen, W.J. (author), van der Lugt, Aad (author), van Walsum, T. (author)

Extracting the cerebral anterior vessel tree of patients with an intracranial large vessel occlusion (LVO) is relevant to investigate potential biomarkers that can contribute to treatment decision making. The purpose of our work is to develop a method that can achieve this from routinely acquired computed tomography angiography (CTA) and...

journal article 2023

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Stability analysis of the boundary value problem modeling a two-layer ocean

Marynets, K. (author)

We study boundedness of solutions to a linear boundary value<br/>problem (BVP) modelling a two-layer ocean with a uniform eddy viscosity in<br/>the lower layer and variable eddy viscosity in the upper layer. We analyse<br/>bounds of solutions to the given problem on the examples of different eddy<br/>viscosity profiles in the case of their...

journal article 2022

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Stabilization of the Lower Jamuna River in Bangladesh: Hydraulic and Morphological Assessment

Giri, Sanjay (author), Thompson, Angela (author), Donchyts, Gennady (author), Oberhagemann, Knut (author), Mosselman, E. (author), Alam, Jahagir (author)

This paper presents a hydraulic and morphological analysis of the Lower Jamuna in Bangladesh with a focus on two key bifurcations that are important for stabilization of the Lower Jamuna reach. We used ground measurements, historical data, multispectral satellite images from various sources as well as numerical models. We carried out hydraulic...

journal article 2021

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Co-existence of a Period Annulus and a Limit Cycle in a Class of Predator-Prey Models with Group Defense

Kooij, Robert (author), Zegeling, André (author)

For a family of two-dimensional predator-prey models of Gause type, we investigate the simultaneous occurrence of a center singularity and a limit cycle. The family is characterized by the fact that the functional response is nonanalytical and ehibits group defense. We prove the eistence and uniqueness of the limit cycle using a new theorem...

journal article 2021

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Persistence of periodic traveling waves and Abelian integrals

Gasull, Armengol (author), Geyer, A. (author), Mañosa, Víctor (author)

It is well known that the existence of traveling wave solutions (TWS) for many partial differential equations (PDE) is a consequence of the fact that an associated planar ordinary differential equation (ODE) has certain types of solutions defined for all time. In this paper we address the problem of persistence of TWS of a given PDE under small...

journal article 2021

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Morphodynamic Equilibria in Double-Inlet Systems: Existence and Stability

Deng, X. (author), Meerman, C. (author), Boelens, T. (author), De Mulder, T. (author), Salles, P. (author), Schuttelaars, H.M. (author)

The existence of morphodynamic equilibria of double-inlet systems is investigated using a cross-sectionally averaged morphodynamic model. The number of possible equilibria and their stability strongly depend on the forcing conditions and geometry considered. This is illustrated by considering a rectangular double-inlet system forced by M<sub...

journal article 2021

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Nonlinear bifurcation analysis of stiffener profiles via deflation techniques

Xia, Jingmin (author), Farrell, Patrick E. (author), Castro, Saullo G.P. (author)

When loading experiments are repeated on different samples, qualitatively different results can occur. This is due to factors such as geometric imperfections, load asymmetries, unevenly stressed regions or uneven material distributions created by manufacturing processes. This fact makes designing robust thin-walled structures difficult. One...

journal article 2020

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A Chebyshev criterion with applications

Gasull, A. (author), Geyer, A. (author), Mañosas, F. (author)

We show that a family of certain definite integrals forms a Chebyshev system if two families of associated functions appearing in their integrands are Chebyshev systems as well. We apply this criterion to several examples which appear in the context of perturbations of periodic non-autonomous ODEs to determine bounds on the number of isolated...

journal article 2020

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Path-space moderate deviations for a class of Curie–Weiss models with dissipation

Collet, F. (author), Kraaij, R.C. (author)

We modify the spin-flip dynamics of the Curie–Weiss model with dissipation in Dai Pra, Fischer and Regoli (2013) by considering arbitrary transition rates and we analyze the phase-portrait as well as the dynamics of moderate fluctuations for macroscopic observables. We obtain path-space moderate deviation principles via a general analytic...

journal article 2020

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Transition to turbulence when the Tollmien-Schlichting and bypass routes coexist

Zammert, S. (author), Eckhardt, B.E. (author)

Plane Poiseuille flow, the pressure-driven flow between parallel plates, shows a route to turbulence connected with a linear instability to Tollmien-Schlichting (TS) waves, and another route, the bypass transition, that can be triggered with finite-amplitude perturbation. We use direct numerical simulations to explore the arrangement of the...

journal article 2019

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Pattern analysis in networks of diffusively coupled Lur'e systems

Rogov, Kirill (author), Pogromsky, Alexander (author), Steur, E. (author), Michiels, Wim (author), Nijmeijer, Henk (author)

In this paper, a method for pattern analysis in networks of diffusively coupled nonlinear systems of Lur'e form is presented. We consider a class of nonlinear systems which are globally asymptotically stable in isolation. Interconnecting such systems into a network via diffusive coupling can result in persistent oscillatory behavior, which...

journal article 2019

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Robustness of attractors in tapping mode atomic force microscopy

Chandrashekar, A. (author), Belardinelli, P. (author), Staufer, U. (author), Alijani, F. (author)

In this work, we perform a comprehensive analysis of the robustness of attractors in tapping mode atomic force microscopy. The numerical model is based on cantilever dynamics driven in the Lennard–Jones potential. Pseudo-arc-length continuation and basins of attraction are utilized to obtain the frequency response and dynamical integrity of...

journal article 2019

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A characterization of side channel development

van Denderen, R. Pepijn (author), Schielen, R.M.J. (author), Straatsma, Menno W. (author), Kleinhans, Maarten G. (author), Hulscher, Suzanne J.M.H. (author)

Side channels are commonly constructed to reduce the flood risk or to increase the ecological value of a river. Such artificial side channels generally aggrade. We categorize the development of side channels based on the sediment that is deposited in these channels. Based on this categorization, we determine the main mechanisms that affect their...

journal article 2019

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A reduced complexity model of a gravel-sand river bifurcation: Equilibrium states and their stability

Schielen, R.M.J. (author), Blom, A. (author)

We derive an idealized model of a gravel-sand river bifurcation and analyze its stability properties. The model requires nodal point relations that describe the ratio of the supply of gravel and sand to the two downstream branches. The model predicts changes in bed elevation and bed surface gravel content in the two bifurcates under...

journal article 2018

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Bifurcation Analysis of a Multi-Parameter Liénard Polynomial System

Gaiko, V. (author), Vuik, Cornelis (author), Reijm, Huibert A.J. (author)

In this paper, we study a multi-parameter Liénard polynomial system carrying out its global bifurcation analysis. To control the global bifurcations of limit cycle in this systems, it is necessary to know the properties and combine the effects of all its field rotation parameters. It can be done by means of the development of our...

journal article 2018

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Global dynamics in the leslie-gower model with the allee effect

Gaiko, Valery A. (author), Vuik, Cornelis (author)

We complete the global bifurcation analysis of the Leslie-Gower system with the Allee effect which models the dynamics of the populations of predators and their prey in a given ecological or biomedical system. In particular, studying global bifurcations of limit cycles, we prove that such a system can have at most two limit cycles surrounding...

journal article 2018

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On the stability of river bifurcations created by longitudinal training walls: Numerical investigation

Le, T.B. (author), Crosato, A. (author), Mosselman, E. (author), Uijttewaal, W.S.J. (author)

To maintain a navigable channel and improve high-flow conveyance, engineers have recently proposed constructing longitudinal training walls as an alternative to the traditional transverse groynes. However, previous work has shown that the system of parallel channels created by a longitudinal training wall might be unstable in rivers with...

journal article 2018