Results 171 to 180 of about 285,442 (311)
Swarm coordination of fish-like magnetic soft robots: directed aggregation and shape-adaptive attachment toward efficient drug delivery. [PDF]
Natl Sci RevMao L +6 more
europepmc +1 more source
Application of higher harmonic blade feathering for helicopter vibration reduction [PDF]
Higher harmonic blade feathering for helicopter vibration reduction is considered. Recent wind tunnel tests confirmed the effectiveness of higher harmonic control in reducing articulated rotor vibratory hub loads. Several predictive analyses developed in
Powers, R. W.
core +1 more source
Energy Science &Engineering, EarlyView.Passing vehicles generate short‐duration wakes that can be redirected toward a vertical‐axis turbine. The interaction between wake structure, blade count, and rotational speed governs transient torque production. Low‐solidity configurations combined with tuned rotational speed enhance energy extraction under vehicle‐induced gusts.
Aydin Ulus, Stefan Ilie Moldovan
wiley +1 more source
Multi-Objective Grey Wolf Optimizer-Tuned LQR Attitude Control of a Three-DOF Hover System. [PDF]
Biomimetics (Basel)Çakan A.
europepmc +1 more source
Energy Science &Engineering, EarlyView.This review presents a comparative analysis of experimental studies aimed at improving the thermal efficiency of solar water heating (SWH) systems. Various enhancement techniques, including nanofluids, phase change materials, optimized collector designs, and hybrid photovoltaic–thermal systems, are evaluated based on their impact on system performance ...
Oluwaseyi O. Alabi +2 more
wiley +1 more source
The Role of Instructional Constraints Performed by Coaches on Tactical Behavior of Soccer Players: A Systematic Review. [PDF]
J Hum KinetMorais CZ +5 more
europepmc +1 more source
Rotor aeroelastic stability coupled with helicopter body motion [PDF]
A 5.5-foot-diameter, soft-in-plane, hingeless-rotor system was tested on a gimbal which allowed the helicopter rigid-body pitch and roll motions. Coupled rotor/airframe aeroelastic stability boundaries were explored and the modal damping ratios were ...
Huber, H. B., Miao, W. L.
core +1 more source
Energy Science &Engineering, EarlyView.This study primarily investigates the optimal width for coal pillar retention in both sides of the worked‐out face section. Taking the 42201 haulage roadway of the 42201 working face at Shengxin Coal Mine as the primary research target, it analyses the optimum width for coal pillar retention through theoretical calculations, numerical simulations, and ...
Shuaifeng Yin +4 more
wiley +1 more source
Unified results of several analytical and experimental studies of helicopter handling qualities in visual terrain flight [PDF]
The studies were undertaken to investigate the effects of rotor design parameters, interaxis coupling, and various levels of stability and control augmentation on the flying qualities of helicopters performing low-level, terrain-flying tasks in visual ...
Chen, R. T. N.
core +1 more source
FlexMat, EarlyView.A blue‐hazard‐free single‐emissive‐layer white OLED is realized using an anti‐quenching multiple‐resonance TADF emitter, BNCT. By integrating a sterically protected MR core with efficient energy transfer capability, BNCT enables warm‐white emission with high efficiency, negligible hazardous blue photons, and a simplified device architecture for next ...
Xiao‐Long Liu +9 more
wiley +1 more source