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Guo, Xiaoyang (author), van de Kleut, Dick (author), Zhang, J. (author), Chen, C. (author), Wang, Xuehang (author), Zheng, Tianye (author), Boles, Steven (author)Activated carbon has long been recognized as a promising electrode material for energy storage devices. The extraordinarily high specific area makes it challenging to replace in supercapacitors since electrical double-layer capacitors need such surfaces but also porous networks to enable electrolyte penetration. As a raw material for...journal article 2024
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van den Boom, S.J. (author), Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)The published article contains a mistake in the notation of the strain–displacement matrix (Formula presented.) in Voigt notation concerning the isoparametric mapping and in the notation of the corresponding derivatives. As the mistakes relate only to the notation, and the implementation in the code was done correctly, they bear no...journal article 2023
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Zhang, J. (author), Gallo, A.J. (author), Ferrari, Riccardo M.G. (author)Multiplicative watermarking (MWM) is an active diagnosis technique for the detection of highly sophisticated attacks, but is vulnerable to malicious agents that use eaves-dropped data to identify and then remove or replicate the watermark. In this work, we propose a scheme to protect the parameters of MWM, by proposing a design strategy based...conference paper 2023
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Zhang, J. (author)Cracks, which could nucleate and propagate in engineering structures, could have an adverse effect on mechanical performance and even lead to catastrophic failure. Thus, it is critical to investigate structural behavior under fracture, which requires an appropriate modeling methodology for fracture analysis. Furthermore, designing structures...doctoral thesis 2022
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Zhang, J. (author), Faragau, Andrei B. (author), van der Esch, I.A. (author), Metrikine, A. (author), van Dalen, K.N. (author)Under harmonic excitation, soil exhibits softening behaviour that can be captured through the so-called hyperbolic soil model. The response of systems with such a material model can elegantly be obtained using the classical Harmonic Balance Method (HBM). Soil also exhibits nonlinear hysteretic damping under harmonic excitation, feature which is...abstract 2022
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Zhang, J. (author), Aragon, A.M. (author)Stress analysis is an all-pervasive practice in engineering design. With displacement-based finite element analysis, directly-calculated stress fields are obtained in a post-processing step by computing the gradient of the displacement field—therefore less accurate. In enriched finite element analysis (EFEA), which provides unprecedented...journal article 2022
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Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)We propose a fully immersed topology optimization procedure to design structures with tailored fracture resistance under linear elastic fracture mechanics assumptions for brittle materials. We use a level set function discretized by radial basis functions to represent the topology and the Interface-enriched Generalized Finite Element Method ...journal article 2022
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Hou, L. G. (author), Yu, H. (author), Wang, Y. W. (author), You, L. (author), He, Z. B. (author), Wu, C. M. (author), Eskin, D. G. (author), Katgerman, L. (author), Zhuang, L. Z. (author), Zhang, J. S. (author)The retrogression and re-aging (RRA) processes, aimed mainly at tailoring intergranular precipitates, could significantly improve the corrosion resistance (i.e., stress corrosion cracking resistance) without considerably decreasing the strength, which signifies that an efficient control of the size, distribution and evolution of intergranular...journal article 2022
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Zhang, J. (author), Zhebel, E.V. (author), van den Boom, S.J. (author), Liu, D. (author), Aragon, A.M. (author)In this work, an object-oriented geometric engine is proposed to solve problems with discontinuities, for instance, material interfaces and cracks, by means of unfitted, immersed, or enriched finite element methods (FEMs). Both explicit and implicit representations, such as geometric entities and level sets, are introduced to describe...journal article 2022
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Souto, Andre (author), Zhang, J. (author), Aragon, A.M. (author), Velikov, Krassimir P. (author), Coulais, Corentin (author)Metamaterials can display unusual and superior properties that come from their carefully designed structure rather than their composition. Metamaterials have permeated large swatches of science, including electromagnetics and mechanics. Although metamaterials hold the promise for realizing technological advances, their potential to enhance...journal article 2022
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Zhang, J. (author), Bisagni, C. (author)This study aims to design novel tailorable and effective mechanisms by controlling buckling behaviour in structural elements of a composite wing for future morphing application. Instead of the traditional design against buckling, the idea is to embrace this built-in instability by using the nonlinear post-buckling response to control...journal article 2021
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Zhang, J. (author), Romero-García, Vicente (author), Theocharis, Georgios (author), Richoux, Olivier (author), Achilleos, Vassos (author), J.Frantzeskakis, Dimitrios (author)We report experiments on high-amplitude sound wave propagation in an acoustic metamaterial composed of an air-filled waveguide periodically side-loaded by holes. In addition to the linear viscothermal and radiation losses, high amplitude sound waves at the locations of the sideholes introduce nonlinear losses. The latter result in an amplitude...journal article 2021
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De Lazzari, Elena (author), van den Boom, S.J. (author), Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)Enriched finite element methods have gained traction in recent years for modeling problems with material interfaces and cracks. By means of enrichment functions that incorporate a priori behavior about the solution, these methods decouple the finite element (FE) discretization from the geometric configuration of such discontinuities. Taking...journal article 2021
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Zhang, J. (author)In speech processing applications, e.g., speech recognition, hearing aids (HAs), video conferencing, and human-computer interaction, speech enhancement or noise reduction is an essential front-end task, as the recorded speech signals are inevitably corrupted by interference, including coherent/incoherent noise and reverberation. Traditional...doctoral thesis 2020
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Wang, Weizheng (author), Wang, Q. (author), Zhang, J. (author), Zuniga, Marco (author)Positioning based on visible light is gaining significant attention. But most existing studies rely on a key requirement: The object of interest needs to carry an optical receiver (camera or photodiode). We remove this requirement and investigate the possibility of achieving accurate positioning in a passive manner—that is, without requiring...journal article 2020
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van den Boom, S.J. (author), Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)During design optimization, a smooth description of the geometry is important, especially for problems that are sensitive to the way interfaces are resolved, e.g., wave propagation or fluid-structure interaction. A level set description of the boundary, when combined with an enriched finite element formulation, offers a smoother description...journal article 2020
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Zhang, J. (author), van den Herik, Bas Mees (author), Wahl, S.A. (author)α-Ketoglutarate (αKG) is a metabolite of the tricarboxylic acid cycle, important for biomass synthesis and a precursor for biotechnological products like 1,4-butanediol. In the eukaryote Saccharomyces cerevisiae αKG is present in different compartments. Compartmentation and (intra-)cellular transport could interfere with heterologous product...journal article 2020
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Zhang, J. (author), Heusdens, R. (author), Hendriks, R.C. (author)Power usage is an important aspect of wireless acoustic sensor networks (WASNs) and reducing the amount of information that is to be transmitted is one effective way to save it. In previous contributions, we presented sensor selection as well as rate distribution methods to reduce the power usage of beamforming algorithms in WASNs. Taking...conference paper 2019
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Zhang, J. (author), van den Boom, S.J. (author), van Keulen, A. (author), Aragon, A.M. (author)A new enriched finite element technique, named the Discontinuity-Enriched Finite Element Method (DE-FEM), was introduced recently for solving problems with both weak and strong discontinuities in 2-D. In this mesh-independent procedure, enriched degrees of freedom are added to new nodes collocated at the intersections between discontinuities...journal article 2019
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Li, Y. (author), Zhang, Z. R. (author), Zhao, Z. Y. (author), Li, H. X. (author), Katgerman, L. (author), Zhang, J. S. (author), Zhuang, L. Z. (author)New 7xxx aluminum alloys with high alloying contents are being designed, which could induce serious hot tearing defects during direct-chill (DC) casting. Among all factors affecting hot tearing of 7xxx alloys, undoubtedly alloying elements play a significant role. In this study, the effect of main alloying elements (Zn, Mg, and Cu) on hot...journal article 2019