Results 61 to 70 of about 317,882 (228)

Design and numerical investigation on aero-hydrodynamic performance of an aerial-aquatic propeller

open access: yesKongqi donglixue xuebao
The aerial-aquatic propeller is a core component of unmanned aerial-aquatic vehicles. Aiming at the problem that the efficiency of aerial-aquatic propellers in air and water cannot be balanced, this paper proposes a design method for aerial-aquatic ...
Linyuan Luo   +4 more
doaj   +1 more source

Borophene‐based sensing platforms: Pioneering ultrasensitive detection

open access: yesFlexMat, EarlyView.
Schematic Diagram of Performance Optimization Strategies and Sensing Application Characteristics of Two‐Dimensional Boron‐Based Materials in Novel Sensors. Abstract Borophene is an emerging two‐dimensional (2D) material. Since significant breakthroughs were achieved in the experimental synthesis of borophene, the exploration and development of ...
Chi Yuan, Yanpeng Ji, Yi Liu, Guoan Tai
wiley   +1 more source

Application of the method of parametric differentiation to two dimensional transonic flows [PDF]

open access: yes, 1979
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1979.MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERONAUTICS.Vita.Includes bibliographical references.by Woodrow Whitlow, Jr.Ph ...
Whitlow, Woodrow
core  

Coherent Stokes Raman Scattering for Simultaneous Measurement of CO2 and CH4 Temperatures

open access: yesJournal of Raman Spectroscopy, EarlyView.
A three‐beam hybrid fs/ps CSRS method is employed to excite the rovibrational transitions in the Fermi‐dyad of CO2$$ {}_2 $$ and the v2$$ {v}_2 $$ mode of CH4$$ {}_4 $$. Time‐domain spectroscopic models are developed to extract the fuel and flame temperature profiles from experimental CH4$$ {}_4 $$ and CO2$$ {}_2 $$ spectra in a diffusion flame ...
Alexander M. Warner   +3 more
wiley   +1 more source

Joint 2-D DOA and Noncircularity Phase Estimation Method

open access: yesLeida xuebao, 2012
Classical joint estimation methods need large calculation quantity and multidimensional search. In order to avoid these shortcoming, a novel joint two-Dimension (2-D) Direction Of Arrival (DOA) and noncircularity phase estimation method based on three ...
Wang Ling, Li Guo-lin, Xie Xin, Qi Shuai
doaj  

Multi-objective UAV trajectory planning algorithm based on the hybrid MS-INSGA2 strategy

open access: yesJournal of King Saud University: Computer and Information Sciences
To address the critical challenges in 3D UAV trajectory planning—specifically the severe tendency to fall into local optima and the inherent dilemma of balancing convergence speed with population diversity in multi-objective optimization—this paper ...
Jian Deng   +4 more
doaj   +1 more source

A New Fixed Axis-Invariant Based Calibration Approach to Improve Absolute Positioning Accuracy of Manipulators

open access: yesIEEE Access, 2020
This paper studies the calibration of industrial robots. Aiming at the problems of cumbersome industrial robot modeling and poor calibration effects, this paper proposes a new calibration method for determining the DH frame and DH parameters of ...
Pengfei Xiao   +4 more
doaj   +1 more source

Transferable Hot‐Deformation Flow‐Curve Modeling Across Steels Through Transfer Learning

open access: yesMaterials Genome Engineering Advances, EarlyView.
We propose a transferable sequence model that moves steel hot‐deformation ML beyond the “one‐case, one‐model” paradigm. Pretrained across compositions/windows and personalized with four extreme‐condition curves, it improves accuracy and robustness in 10‐fold evaluation.
Changqing Shu   +9 more
wiley   +1 more source

A self-centering and stiffness-controlled MEMS accelerometer

open access: yesMicrosystems & Nanoengineering
This paper presents a high-performance MEMS accelerometer with a DC/AC electrostatic stiffness tuning capability based on double-sided parallel plates (DSPPs).
Yiming Jin   +5 more
doaj   +1 more source

Multi-layer broadband asymmetric transmission of linearly polarised in active metasurface

open access: yesThe Journal of Engineering, 2019
Although many different kinds of polarisers have been extensively studied in the last 20 years, most previous designs were passive and single-functional designs. In this study, a kind of a new active polarisation converter is designed.
You Li   +3 more
doaj   +1 more source

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