Results 31 to 40 of about 608,631 (290)

Overcoming Drag at the Water-Air Interface Constrains Body Size in Whirligig Beetles

Fluids, 2021
Whirligig beetles (Coleoptera: Gyrinidae) are among the best swimmers of all aquatic insects. They live mostly at the water’s surface and their capacity to swim fast is key to their survival. We present a minimal model for the viscous and wave drags they
Ludovic Jami, Grey T. Gustafson, Thomas Steinmann, Miguel Piñeirua, Jérôme Casas   +4 more
doaj   +1 more source

Interplanetary Trajectory Optimization with Powerlimited Propulsion Systems [PDF]

, 1962
A trajectory-optimization process is described in which the optimum thrust equations are derived using the calculus of variations. The magnitude of the thrust is constrained within an upper and a lower bound, but the thrust direction is arbitrary.
Melbourne, W. G., Richardson, D. E., Sauer, C. G., Jr.   +2 more
core   +1 more source

Remote Assessment of Ataxia Severity in SCA3 Across Multiple Centers and Time Points

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Spinocerebellar ataxia type 3 (SCA3) is a genetically defined ataxia. The Scale for Assessment and Rating of Ataxia (SARA) is a clinician‐reported outcome that measures ataxia severity at a single time point. In its standard application, SARA fails to capture short‐term fluctuations, limiting its sensitivity in trials.
Marcus Grobe‐Einsler, Vivian Maas, Arian Taheri Amin, Jennifer Faber, Tamara Schaprian, Katharina Hill, Matthis Synofzik, Lisa H. Graf, Heike Jacobi, Manuela Lima, Ana F. Ferreira, Bart P. van de Warrenburg, Ilse H. J. Willemse, Dagmar Timmann, Andreas Thieme, Paola Giunti, Hector Garcia‐Moreno, Magda M. Santana, Jeannette Hübener‐Schmid, Elin H. Davies, Thomas Klockgether   +20 more
wiley   +1 more source

Maximizing wireless power transfer efficiency at exceptional points

Communications Engineering
Magnetically coupled wireless power transfer (WPT) technology has been applied in stationary consumer electronics and holds great potential for charging traveling electric vehicles.
Wei-Kang Hu, Bowang Zhang, Youhao Hu, Haoxiang Li, Wei Han   +4 more
doaj   +1 more source

Simultaneous Identification of Multiple Parameters in Wireless Power Transfer Systems Using Primary Variable Capacitors

Applied Sciences
This paper proposes a novel approach to simultaneously identifying multiple critical parameters in a wireless power transfer (WPT) system, such as the resonant frequency, mutual inductance, and load resistance, solely from the primary side. The key is to
Chang Liu, Wei Han, Youhao Hu, Bowang Zhang   +3 more
doaj   +1 more source

FollowNet: A Comprehensive Benchmark for Car-Following Behavior Modeling

Scientific Data, 2023
Car-following is a control process in which a following vehicle adjusts its acceleration to keep a safe distance from the lead vehicle. Recently, there has been a booming of data-driven models that enable more accurate modeling of car-following through ...
Xianda Chen, Meixin Zhu, Kehua Chen, Pengqin Wang, Hongliang Lu, Hui Zhong, Xu Han, Xuesong Wang, Yinhai Wang   +8 more
doaj   +1 more source

Relationship between Corona Discharge Thrust and Applied Voltage’s Polarity

Energies, 2023
The thrust from corona discharge might be a promising propulsion technology in future aviation due to its advantage of not requiring mechanical moving parts.
Liang Gu, Wei Tan, Juan He, Zheng Jiang, Xingang Chen, Wenfa Ren, Zhuangzhuang Jin   +6 more
doaj   +1 more source

Series-hybrid bearing - An approach to extending bearing fatigue life at high speeds [PDF]

, 1971
Fluid film bearing of hybrid device consists of orifice compensated annular thrust bearing and self-acting journal bearing. In series hybrid bearing, both ball bearing and annular thrust bearing carry full system thrust load, but two bearings share speed.
Anderson, W. J., Coe, H. H., Fleming, D. P., Parker, R. J.   +3 more
core   +1 more source

Economic Burden of Rheumatoid Arthritis in Low‐ and Middle‐Income Countries: Systematic Review and Meta‐Analysis

Arthritis Care &Research, EarlyView.
Objective The aim of this systematic review was to synthesize the economic impact of rheumatoid arthritis (RA) on households, health systems, and society in low‐ and middle‐income countries (LMICs). Methods Electronic databases such as PubMed, Web of Science, and CINAHL were searched using keywords related to RA and cost of illness.
Tadesse Gebrye, Chidozie E. Mbada, Clara T. Fatoye, Faatihah Niyi‐Odumosu, Ushotanefe Useh, Zalmai Hakimi, Francis Fatoye   +6 more
wiley   +1 more source

Empowering high-dimensional optical fiber communications with integrated photonic processors

Nature Communications
Mode-division multiplexing (MDM) in optical fibers enables multichannel capabilities for various applications, including data transmission, quantum networks, imaging, and sensing.
Kaihang Lu, Zengqi Chen, Hao Chen, Wu Zhou, Zunyue Zhang, Hon Ki Tsang, Yeyu Tong   +6 more
doaj   +1 more source