Results 151 to 160 of about 97,833 (315)

Towards Autonomy of a Quadrotor UAV [PDF]

, 2008
As the potential of unmanned aerial vehicles rapidly increases, there is a growing interest in rotary vehicles as well as fixed wing. The quadrotor is small agile rotary vehicle controlled by variable speed prop rotors.
Cowling, Ian
core  

Robust multi-disciplinary design and optimisation of a reusable launch vehicle

, 2014
For various technical reasons, no fully reusable launch vehicle has ever been successfully constructed or operated. Nonetheless, a range of reusable hypersonic vehicles is currently being considered as a viable alternative to the expensive but more ...
Edmondo Minisci, Fabrizio Pescetelli, Richard E. Brown, Minisci, Edmondo, Wuilbercq, Romain, Mogavero, Alessandro, Romain Wuilbercq, Pescetelli, Fabrizio, Brown, Richard, Alessandro Mogavero   +9 more
core   +1 more source

Improved whale optimization for time-optimal and collision-free trajectory planning in dual-arm robots

Scientific Reports
To address the challenges of environmental and collaborative obstacle avoidance in dual-arm robot path optimization, a time-optimal trajectory optimization method based on a multi-strategy optimized Whale Optimization Algorithm (WOA) is proposed.
Ying Du, Chengbo Xu, Yunjia Wang, Yupeng Liu, Yuehui Wang, Jian Jin   +5 more
doaj   +1 more source

Chiral Phase Change Nanomaterials

Advanced Functional Materials, EarlyView.
This work demonstrates reversible, non‐volatile phase transitions in chiral Ge2${\rm Ge}_2$Sb2${\rm Sb}_2$Te5${\rm Te}_5$ (GST) nanohelices for high‐speed optical modulation of chirality and dynamic control of the state of polarization (SOP). The chiral nanostructures are fabricated using a highly directional, wafer‐scale physical vapor deposition ...
Joshua A. Burrow, Md Shah Alam, Riad Yahiaoui, Evan M. Smith, Ryan Laing, Jules Gardener, Thomas A. Searles, Piyush J. Shah, Shivashankar Vangala, Joshua R. Hendrickson, Andrew M. Sarangan, Imad Agha   +11 more
wiley   +1 more source

Advances in Hybrid Evolutionary Computation for Continuous Optimization

, 2011
Evolutionary Algorithms (EAs) are a set of optimization techniques that have become highly popular in recent decades. One of the main reasons for this success is that they provide a general purpose mechanism for solving a wide range of problems.
Muelas Pascual, Santiago
core   +1 more source

Electro‐Steric Ion Confinement in Polyelectrolyte Networks for Robust Nonvolatile Artificial Synapse

Advanced Functional Materials, EarlyView.
Polyelectrolyte stoichiometry governs ion transport and retention in electrolyte‐gated synaptic transistors. A PSS‐rich network creates electro‐steric ion confinement that suppresses ion back‐diffusion and stabilizes channel doping, enabling robust nonvolatile synaptic memory, linear weight updates, and low‐energy operation.
Donghwa Lee, Jinbo Kim, Myeongjin An, Jisoo Park, Junho Sung, Eunsung Hwang, Suhwan Seok, Seong‐Min Bak, Jeonghun Kim, Eunho Lee   +9 more
wiley   +1 more source

Analysis of interplanetary solar sail trajectories with attitude dynamics

, 2012
We present a new approach to the problem of optimal control of solar sails for low-thrust trajectory optimization. The objective was to find the required control torque magnitudes in order to steer a solar sail in interplanetary space.
Borggrafe, Andreas, Dachwald, Bernd, Sebolt, Wolfgang, Ohndorf, Andreas   +3 more
core  

A Cartesian-Based Trajectory Optimization with Jerk Constraints for a Robot. [PDF]

Entropy (Basel), 2023
Fan Z, Jia K, Zhang L, Zou F, Du Z, Liu M, Cao Y, Zhang Q.   +7 more
europepmc   +1 more source

Ultrasmall High‐Entropy Materials: Nanoscale Effects, Synthesis, and Mechanistic Insights

Advanced Functional Materials, EarlyView.
This review article focuses on sub‐10 nm high‐entropy materials that combine nanoscale design with complex compositions for next‐generation applications. ABSTRACT Ultrasmall high‐entropy nanomaterials (USHENMs, <10 nm) merge multicomponent chemistry with size‐dependent effects, forming a distinct class of materials with unprecedented properties.
Yueyue He, Wenbo Wang, Simon Schweidler, Yanjiao Ma, Ben Breitung, Torsten Brezesinski   +5 more
wiley   +1 more source

Customized Trajectory Optimization and Compliant Tracking Control for Passive Upper Limb Rehabilitation. [PDF]

Sensors (Basel), 2023
Li L, Han J, Li X, Guo B, Wang X.
europepmc   +1 more source