Results 91 to 100 of about 5,819 (195)

Finite Time Robust Control of the Sit-to-Stand Movement for Powered Lower Limb Orthoses

, 2018
This study presents a technique to safely control the Sit-to-Stand movement of powered lower limb orthoses in the presence of parameter uncertainty. The weight matrices used to calculate the finite time horizon linear-quadratic regulator (LQR) gain in ...
athans, moore, seiler, sira-ramirez, slotine, strickland   +5 more
core   +1 more source

Neutron Computed Tomography: A Novel High‐Resolution, Non‐Destructive Method for Screening Fossil Coral for Diagenetic Alteration for Geochronologic and Paleoclimatic Reconstructions

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract A novel high‐resolution, non‐destructive method for diagenetic screening of fossil corals for geochronologic and paleoclimatic studies using neutron computed tomography (NCT) is proposed. NCT circumvents limitations of traditional techniques, such as destructive sampling and 2‐D imaging by providing detailed 3‐D visualizations of coral ...
Carra Williams, Jody M. Webster, Joseph J. Bevitt, Gregory E. Webb, Luke D. Nothdurft, Victorien Paumard, Helen McGregor, Richard J. Murphy   +7 more
wiley   +1 more source

Classical mechanics of many particles defined on canonically deformed nonrelativistic space-time

, 2011
We provide the classical mechanics of many particles moving in canonically twist-deformed space-time. In particular, we consider two examples of such noncommutative systems - the set of N particles moving in gravitational field as well as the system of N
Daszkiewicz, Marcin, Walczyk, Cezary J.
core   +1 more source

Hybrid phantom for lung CT: Design and validation

Medical Physics, Volume 52, Issue 8, August 2025.
Abstract Background CT lung imaging protocols need to be optimized. This claim is especially important due to the possible introduction of low‐dose CT (LDCT) for lung cancer screening. Given the incorporation of non‐linear reconstructions and post‐processing, the use of phantoms that consider task‐based evaluation is needed.
Paulo Roberto Costa, Gisell Ruiz Boiset, Elsa Bifano Pimenta, Raphael Moratta Vieira Rocha, Raissa Aline Santos Moura, Wagner Henrique Marques, Luuk J. Oostveen, Bram Geurts, Marcio Valente Yamada Sawamura, Denise Yanikian Nersissian, Elisabeth Mateus Yoshimura, Ioannis Sechopoulos   +11 more
wiley   +1 more source

Towards Efficient Full Pose Omnidirectionality with Overactuated MAVs

, 2018
Omnidirectional MAVs are a growing field, with demonstrated advantages for aerial interaction and uninhibited observation. While systems with complete pose omnidirectionality and high hover efficiency have been developed independently, a robust system ...
CW Wampler, D Invernizzi, M Ryll, R Falconi, S Park   +4 more
core   +1 more source

Novel validation of HDR brachytherapy dosimetry for cervical cancer using egs_brachy Monte Carlo simulations: a comparative analysis with Oncentra treatment planning system

Journal of Applied Clinical Medical Physics, Volume 26, Issue 7, July 2025.
Abstract Purpose This study aims to validate HDR brachytherapy dosimetry for cervical cancer patients utilizing the egs_brachy Monte Carlo (MC) simulation. Methods Three cervical cancer patients treated with 192Ir HDR brachytherapy were included. Dose distributions were calculated by the Oncentra Brachy v4 treatment planning system (TPS) based on AAPM ...
Duong Thanh Tai, Nguyen Thi Anh Thu, Tran Thien Thanh, Pham Anh Tuan, Marc J. P. Chamberland, Peter Sandwall, David Bradley, James C. L. Chow   +7 more
wiley   +1 more source

Capture Point Trajectories for Reduced Knee Bend using Step Time Optimization

, 2017
Traditional force-controlled bipedal walking utilizes highly bent knees, resulting in high torques as well as inefficient, and unnatural motions. Even with advanced planning of center of mass height trajectories, significant amounts of knee-bend can be ...
Bertrand, Sylvain, Griffin, Robert J., Leonessa, Alexander, Pratt, Jerry, Wiedebach, Georg   +4 more
core   +1 more source

Convolutional Neural Network Based Metal Artifact Reduction in X-ray Computed Tomography

, 2018
In the presence of metal implants, metal artifacts are introduced to x-ray CT images. Although a large number of metal artifact reduction (MAR) methods have been proposed in the past decades, MAR is still one of the major problems in clinical x-ray CT ...
Yu, Hengyong, Zhang, Yanbo
core   +1 more source

EVALUATING MULTI-LAYERED SHIELDS FOR LOW ENERGY PHOTONS USING MCNP5 CODE AND XCOM PROGRAM

, 2019
MCNP5 was used to evaluate the shielding properties of different composite shields made of combinations of four elements; Tungsten (W), Bismuth (Bi), Tin (Sn), and Zinc (Zn), at different weight ratios. Attenuation coefficients calculated by MCNP5 were compared with XCOM theoretical data for 11 different photon energies ranging from (15 -150 keV). Mass
Omyma G. Ibrahim, Dorrah, Mahmoud E., Metwally A. Qotb   +2 more
openaire   +1 more source

Narrow-based gait in people with Parkinson's disease: Its mechanisms explored

Journal of Parkinson’s Disease
Background People with Parkinson's disease (PD) typically exhibit a narrow-based gait. We previously found that walking with reduced trunk rotation and obliquity led to narrow-based gait in healthy adults; a decrease in trunk motion coincided with a ...
Jamie AF Jansen, Tom JW Buurke, Lotte van de Venis, Vivian Weerdesteyn, Noël Keijsers, Jorik Nonnekes   +5 more
doaj   +1 more source