Results 121 to 130 of about 32,763 (309)
An aerostable drag-sail device for the deorbit and disposal of sub-tonne, low earth orbit spacecraft [PDF]
, 2006 There is an increasing amount of debris in low Earth orbit arising from the disintegration and collision of old spacecraft which have not been removed from orbit. A ‘bolt-on’ deorbit device to be attached to new spacecraft is therefore proposed, which
Harkness, Patrick George
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Advanced Science, EarlyView.A rotational energy harvesting device that successfully reconciles high power density with mechanical durability through a hybrid sliding‐and‐bouncing kinematic mechanism is reported. The success reported in our paper includes addressing a dilemma where enhanced electrical output comes at the cost of increased friction and wear, limiting the practical ...
Yihong Lin +12 more
wiley +1 more source
Predictive model of bulk drag coefficient for a nature-based structure exposed to currents. [PDF]
Sci Rep, 2021 Gijón Mancheño A +3 more
europepmc +1 more source
Advanced Science, EarlyView.By engineering the molecular order and thickness of PDMS layers, we reconcile the stickiness and slipperiness during bubble transport. AFM measurements and MD simulations further reveal how these nanoscale architectures tune hydrophobic interaction FHB and friction force f.
Shishuang Zhang +7 more
wiley +1 more source
Turbulator Diameter and Drag on a Sphere
, 2009 A sphere with turbulators of varying diameter was pulled through water with constant force. The relationship between the diameter of the turbulators and the ball’s total coefficient of drag was determined.
Nicholas Robson
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Advanced Science, EarlyView.A tri‐phase Ni2CoFeV medium‐entropy alloy with fcc, κ, and L12 phases achieves exceptional cryogenic strength‐ductility synergy at 77 K. It delivers a yield strength of 1.4 GPa, an ultimate tensile strength of 2.07 GPa and a tensile ductility of 28%.
Lei Gu +4 more
wiley +1 more source
A Data‐Driven Inverse Design Methodology for Magnetic Soft Millirobots Navigating in Confined Spaces
Advanced Science, EarlyView.A data‐efficient inverse design framework automates the optimization of magnetic soft millirobots for confined‐space navigation. Integrating a physics‐based Cosserat rod model with Bayesian optimization efficiently identifies high‐performance geometries.
Ziyu Ren +5 more
wiley +1 more source
A study on aerodynamic characteristics and visualization of flow field of lift-drag combined starter
Advances in Mechanical Engineering, 2019 This study refers to the modification of the aerodynamic characteristics of the starter for the lift-type vertical axis wind turbine, the structure of the traditional drag starter was improved, and the lift-drag combined starter model was proposed. Based
Fang Feng +4 more
doaj +1 more source
Drag coefficients in hydraulic channel
, 2022 Experimental information is extremely useful in solving problems involving flow over bodies, as well as for determination of design parameters in aerodynamics and hydrodynamics, the drag coefficient being one of the most relevant as it allows to quantify the drag forces, that is, the total resistance of a body being dragged by a fluid. In this context,
openaire +1 more source
The drag coefficient of tennis balls
, 2000 The aim of this study is to gain an understanding of the motion of a tennis ball during flight. A wind tunnel was used to measure the aerodynamic forces on a tennis ball, and hence calculate their drag coefficients at wind speeds up to 136mph. The drag
Haake, Steve, Chadwick, S. G.
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