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The Simultaneous Model-Based Estimation of Joint, Muscle, and Tendon Stiffness is Highly Sensitive to the Tendon Force-Strain Relationship

Cop, Christopher P. (author), Jakubowski, Kristen L. (author), Schouten, A.C. (author), Koopman, Bart (author), Perreault, Eric J. (author), Sartori, Massimo (author)

Objective: Accurate estimation of stiffness across anatomical levels (i.e., joint, muscle, and tendon) in vivo has long been a challenge in biomechanics. Recent advances in electromyography (EMG)-driven musculoskeletal modeling have allowed the non-invasive estimation of stiffness during dynamic joint rotations. Nevertheless, validation has...

journal article 2024

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Electrical Impedance Measurements in the Gastrointestinal Tract: Cancerous or Non-Cancerous?

Remmerswaal, Evan (author)

Objective: This work focuses on the feasibility of using Electrical Impedance Spectroscopy (EIS) to differentiate between cancerous and healthy tissues in real-time alongside the GI tract. This is to see whether it is possible to support surgeons when taking biopsies, or to see if it is possible to make biopsies obsolete with EIS. Methods: The...

master thesis 2023

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A Control Method for Converter-interfaced Sources to Improve Operation of Directional Protection Elements

Yang, Zhe (author), Liu, Zhou (author), Zhang, Qi (author), Chen, Zhe (author), de Jesus Chavez, Jose (author), Popov, M. (author)

The traditional fault control strategy of converter-interfaced renewable energy sources (CIRESs) may bring about a lower sensitivity level or misoperation of fault component-based directional elements. To overcome this problem, a new control scheme is proposed to adjust sequence impedance angles of CIRESs by computing suitable current...

journal article 2023

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A Dynamically Reconfigurable Recursive Switched-Capacitor DC-DC Converter with Adaptive Load Ability Enhancement

Lu, Qi (author), Li, Shuangmu (author), Zhao, Bo (author), Jiang, Junmin (author), Chen, Zhiyuan (author), Du, S. (author)

Multiple voltage conversion ratio (VCR) recursive switched-capacitor (SC) dc-dc converters, based on several basic 2:1 converters, are widely used for on-chip power supplies due to their flexible VCRs for higher energy efficiency. However, conventional multiple VCR SC converters usually have one or more 2:1 converters unused for some VCRs,...

journal article 2023

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A Dual-Polarized Bandwidth Enhanced Filtering Dipole Antenna Design for 5G

Çelik, F.T. (author), Joof, Sulayman (author), Karacuha, Kamil (author)

The present study proposes a dual-polarized bandwidth-enhanced filtering specialized dipole antenna design for 5G by employing a wide printed dipole, filtering resonators, a reflector surface, and specially designed balun structures. Such a configuration is commonly deployed in conventional base stations. To increase the antenna impedance and...

journal article 2023

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An Inverted Doherty Power Amplifier Insensitive to Load Variation With an Embedded Impedance Sensor in Its Output Power-Combining Network

Singh, G.D. (author), Nemati, Hossein Mashad (author), Alavi, S.M. (author), de Vreede, L.C.N. (author)

This article presents an inverted Doherty power amplifier (IDPA) made load insensitive up to 2:1 voltage standing wave ratio (VSWR) across its fractional bandwidth with a very compact wideband impedance sensor embedded in its output power-combining network (OPCN). To correct for load variation, a low-loss tunable resonator (TR) is used to...

journal article 2023

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FEM modelling to predict spatiotemporally resolved water uptake in organic coatings: Experimental validation by odd random phase electrochemical impedance spectroscopy measurements

Meeusen, M. (author), van Dam, J.P.B. (author), Madelat, N. (author), Jalilian, E. (author), Wouters, B. (author), Hauffman, T. (author), Van Assche, G. (author), Mol, J.M.C. (author), Hubin, A. (author), Terryn, H.A. (author)

In this work, a new finite element modelling (FEM) approach is followed to model spatiotemporally resolved water uptake in organic coatings. To this aim, we start from a physical model, where not only Fickian diffusion of water is taken into account but also the adsorption/desorption reaction of water on the polymer matrix. Starting from a...

journal article 2023

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A Parameter Recognition Based Impedance Tuning Method for SS-Compensated Wireless Power Transfer Systems

Zhu, G. (author), Dong, J. (author), Grazian, F. (author), Bauer, P. (author)

This article presents a parameter recognition-based impedance tuning method for the impedance mismatch caused by capacitance drift and coil misalignment in series-series-compensated wireless power transfer (WPT) systems. First, a parameter recognition method is proposed to identify the unknown parameters of the resonant circuits by only...

journal article 2023

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Robotic Skill Mutation in Robot-to-Robot Propagation During a Physically Collaborative Sawing Task

Maessen, Rosa E.S. (author), Prendergast, J.M. (author), Peternel, L. (author)

Skill propagation among robots without human involvement can be crucial in quickly spreading new physical skills to many robots. In this respect, it is a good alternative to pure reinforcement learning, which can be time-consuming, or learning from human demonstration, which requires human involvement. In the latter case, there may not be...

journal article 2023

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A Highly Linear Receiver Using Parallel Preselect Filter for 5G Microcell Base Station Applications

Montazerolghaem, M.A. (author), de Vreede, L.C.N. (author), Babaie, M. (author)

By introducing three different techniques, this article, for the first time, presents a wideband highly linear receiver (RX) capable of handling blocking scenarios in fifth-generation (5G) microcell base station applications. First, a parallel preselect filter is introduced to satisfy the base station co-location blocking requirements. Next,...

journal article 2023

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Parallel Plate Waveguide Feeding Structure for Planar Connected Arrays

Cavallo, D. (author)

A novel approach for the practical realization of the feeding lines in connected array of slots is presented. The proposed feed concept is based on a parallel-plate waveguide (PPW) structure and allows simplifying the unit cell design. When compared to the typical integrated coaxial feed, the PPW-based feeding structure can reduce the cost...

journal article 2022

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Investigation of the hydration properties of cement with EDTA by alternative current impedance spectroscopy

Chi, Lin (author), Li, Wenda (author), Li, Z. (author), Wang, Zheng (author), Lu, Shuang (author), Liu, Qi (author)

Alternative current impedance spectroscopy (ACIS) is a promising non-destructive testing method to monitor long-term change and assess the durability of concrete. This study investigates the influences of Ethylene Diamine Tetraacetic Acid (EDTA) on the hydration of hardening cement by ACIS. It is found that EDTA retards the early-age...

journal article 2022

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Identification of Hip and Knee Joint Impedance During the Swing Phase of Walking

van der Kooij, H. (author), Fricke, Simone S. (author), Van 't Veld, Ronald C. (author), Prieto, Ander Vallinas (author), Keemink, Arvid Q.L. (author), Schouten, A.C. (author), Van Asseldonk, Edwin H.F. (author)

Knowledge on joint impedance during walking in various conditions is relevant for clinical decision-making and the development of robotic gait trainers, leg prostheses, leg orthotics and wearable exoskeletons. Whereas ankle impedance during walking has been experimentally assessed, knee and hip joint impedance during walking have not been...

journal article 2022

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A Current Re-Use Quadrature RF Receiver Front-End for Low Power Applications: Blixator Circuit

Barzgari, Mohammad (author), Ghafari, A. (author), Meghdadi, Masoud (author), Medi, Ali (author)

This article presents the theory and implementation of a quadrature and differential RF front-end receiver. Combining balun, low-noise amplifier (LNA), mixer, and oscillator in a single stage, the proposed circuit, named the Blixator, is well suited for low-power applications. The baseband's transimpedance amplifier (TIA) also shares part of...

journal article 2022

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Learning to Pick at Non-Zero-Velocity from Interactive Demonstrations

Mészáros, A. (author), Franzese, G. (author), Kober, J. (author)

This work investigates how the intricate task of a continuous pick & place (P&P) motion may be learned from humans based on demonstrations and corrections. Due to the complexity of the task, these demonstrations are often slow and even slightly flawed, particularly at moments when multiple aspects (i.e., end-effector movement,...

journal article 2022

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Estimation of the modulation of friction from the mechanical impedance variations

Huloux, Nicolas (author), Bernard, Corentin (author), Wiertlewski, M. (author)

Ultrasonic surface-haptic touchscreens produce compelling tactile sensations directly on the users' fingertips. The tactile sensations stem from the modulation of friction produced by acoustic radiation pressure, which reduces the contact between the skin and the glass plate. During this process, some of the vibrations are partly absorbed by...

journal article 2021

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Stability Region Exploring of Shunt Active Power Filters Based on Output Admittance Modeling

Lei, Jintao (author), Qin, Z. (author), Li, Wuhua (author), Bauer, P. (author), He, Xiangning (author)

A shunt active power filter (SAPF) is coupled with load admittance in weak grid conditions, which poses a challenge to stability analysis. In this article, the admittance model of the SAPF is developed, which reveals the coupling mechanism between SAPF and load concisely and accurately. On top of that, the stability region of the system is...

journal article 2021

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Exploring water and ion transport process at silicone/copper interfaces using in-situ electrochemical and Kelvin probe approaches

Munirathinam, B. (author), van Dam, J.P.B. (author), Herrmann, Annemarie (author), van Driel, W.D. (author), De Buyl, F. (author), Erich, S. J.F. (author), van der Ven, L.G.J. (author), Adan, O. C.G. (author), Mol, J.M.C. (author)

In general, packaging materials which encapsulate light emitting diodes (LEDs) and microelectronic devices offer barrier protection against several environmental hazards such as water and ionic contaminants. However, these encapsulants may provide pathways for water and ionic contaminants to reach the metal/polymer interfaces and provoke local...

journal article 2021

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Practical Engineering Design Tool for Vibration Sensitive Laboratory Building Structures: Development of a practical design tool based on a scientific model for an early design of vibration sensitive laboratory building structures excited by traffic induced vibrations for use in engineering practice

Schut, Gerwin (author)

The prediction of structural vibrations in vibration sensitive laboratory structures is a complex problem involving computationally heavy 3D models with long computational times. However, in the early design phases of a project long computational times are undesirable. Therefore the problem statement of this Master thesis concerns the...

master thesis 2019

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Output Impedance Modelling and Sensitivity Study of Grid-Feeding Inverters with Dual Current Control

Beloqui Larumbe, L. (author), Qin, Z. (author), Bauer, P. (author)

In this paper, the output impedance of a three-phase inverter based on a dual current control (also called double synchronous reference frame current control) is modelled, which includes: the current loop gain, the control delay, and the Phase-<br/>Locked Loop (PLL). The impact of these parameters on the impedance is then analysed by a...

conference paper 2019