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Bioimpedance measurements are a non-invasive method to determine the composition of organic tissue. For measuring the complex bioimpedance between two electrodes, an alternating current with a constant amplitude is injected into the tissue.…

Instrumentation and Detectors · Physics 2020-08-07 Roman Kusche , Steffen Kaufmann , Martin Ryschka

We study the drag on a centimetric sphere in a uniform flow in the presence of a free surface as a function of submergence depth. Through direct force measurements in a custom benchtop recirculating flume, we demonstrate that the drag can…

Fluid Dynamics · Physics 2023-10-05 Robert Hunt , Ze Zhao , Eli Silver , Jinhui Yan , Yuri Bazilevs , Daniel M. Harris

We present {\em direct} and {\em linear} measurements of the normal stiffness and damping of a confined, few molecule thick water layer. The measurements were obtained by use of a small amplitude (0.36 $\textrm{\AA}$), off-resonance Atomic…

Soft Condensed Matter · Physics 2009-11-10 Steve Jeffery , Peter M. Hoffmann , John B. Pethica , Chandra Ramanujan , H. Özgür Özer , Ahmet Oral

The topology method is an algorithm for accurate estimation of instantaneous heartbeat intervals using millimeter-wave radar signals. In this model, feature points are extracted from the skin displacement waveforms generated by heartbeats…

Signal Processing · Electrical Eng. & Systems 2024-02-23 Yuji Tanaka , Kimitaka Sumi , Itsuki Iwata , Takuya Sakamoto

We present a new model for calculating locomotion costs in breath-hold divers. Starting from basic mechanics principles, we calculate the work that the diver must provide through propulsion to counterbalance the action of drag, the buoyant…

Quantitative Methods · Quantitative Biology 2024-01-30 Martino Trassinelli

Neural rendering techniques have significantly advanced 3D human body modeling. However, previous approaches often overlook dynamics induced by factors such as motion inertia, leading to challenges in scenarios like abrupt stops after…

Computer Vision and Pattern Recognition · Computer Science 2024-07-17 Yutong Chen , Yifan Zhan , Zhihang Zhong , Wei Wang , Xiao Sun , Yu Qiao , Yinqiang Zheng

We consider a rigid body acted upon by two forces, a constant force and the collective force of interaction with a continuum of particles. We assume that some of the particles that collide with the body reflect elastically (specularly),…

Analysis of PDEs · Mathematics 2014-01-30 Xuwen Chen , Walter Strauss

The ability to estimate task difficulty is critical for many real-world decisions such as setting appropriate goals for ourselves or appreciating others' accomplishments. Here we give a computational account of how humans judge the…

Artificial Intelligence · Computer Science 2019-05-15 Ilker Yildirim , Basil Saeed , Grace Bennett-Pierre , Tobias Gerstenberg , Joshua Tenenbaum , Hyowon Gweon

Floating offshore structures often exhibit low-frequency oscillatory motions in the horizontal plane, with amplitudes in the same order as their characteristic dimensions and larger than the corresponding wave-frequency responses, making…

Fluid Dynamics · Physics 2021-10-07 Yanlin Shao , Zhiping Zheng , Hui Liang , Jikang Chen

In this paper we consider the stability issue for the inverse problem of determining an unknown inclusion contained in an elastic body by all the pairs of measurements of displacement and traction taken at the boundary of the body. Both the…

Analysis of PDEs · Mathematics 2016-10-06 Antonino Morassi , Edi Rosset

The microstructure and rheological properties of suspensions of neutrally buoyant hard spherical particles in Newtonian fluid under conditions of finite inertia are studied using the lattice-Boltzmann method (LBM), which is based on a…

Soft Condensed Matter · Physics 2015-06-19 Hamed Haddadi , Jeffrey F. Morris

Hydrodynamic slip of Newtonian liquids is a new phenomenon, the origin of which is not yet clarified. There are various direct and indirect techniques to measure slippage. Here we describe a method to characterize the influence of slippage…

Soft Condensed Matter · Physics 2008-05-29 Oliver Baeumchen , Renate Fetzer , Andreas Muench , Barbara Wagner , Karin Jacobs

Computer-aided assessment of physical rehabilitation entails evaluation of patient performance in completing prescribed rehabilitation exercises, based on processing movement data captured with a sensory system. Despite the essential role…

Machine Learning · Computer Science 2020-01-24 Y. Liao , A. Vakanski , M. Xian

The microalga Chlamydomonas Reinhardtii (CR) is used here as a model system to study the effect of complex environments on the swimming of micro-organisms. Its motion can be modelled by a run and tumble mechanism so that it describes a…

Soft Condensed Matter · Physics 2019-03-27 Marvin Brun-Cosme-Bruny , Eric Bertin , Benoît Coasne , Philippe Peyla , Salima Rafaï

Human pose detection systems based on state-of-the-art DNNs are on the go to be extended, adapted and re-trained to fit the application domain of specific sports. Therefore, plenty of noisy pose data will soon be available from videos…

Computer Vision and Pattern Recognition · Computer Science 2020-04-22 Rainer Lienhart , Moritz Einfalt , Dan Zecha

The inertial (IP) and anthropometrical (AP) parameters of human body are mostly estimated from coefficients issue from cadaver measurements. These parameters could involve errors in the calculation of joint torques during explosive…

Numerical Analysis · Mathematics 2013-05-29 Jérôme Bastien , Yoann Blache , Karine Monteil

Lower bounds are obtained on the maximum field strength in one or both phases in a body containing two-phases. These bounds only incorporate boundary data that can be obtained from measurements at the surface of the body, and thus may be…

We consider an inverse flow problem in which the airfoil shape is identified from its wake signature, namely the velocity field in the wake of a target airfoil. This is an ill-posed problem and highly sensitive to the accuracy and…

Fluid Dynamics · Physics 2026-04-14 Zhen Zhang , George Em Karniadakis

We review the literature on swimming in complex fluids. A classification is proposed by comparing the length and time scales of a swimmer with those of nearby obstacles, interpreted broadly, extending from rigid or soft confining boundaries…

Fluid Dynamics · Physics 2023-01-02 Saverio E. Spagnolie , Patrick T. Underhill

Action coordination in human structure is indispensable for the spatial constraints of 2D joints to recover 3D pose. Usually, action coordination is represented as a long-range dependence among body parts. However, there are two main…

Computer Vision and Pattern Recognition · Computer Science 2025-06-04 Mingjie Wei , Xuemei Xie , Yutong Zhong , Guangming Shi