Results 1 to 10 of about 148,938 (164)
Efficient Two-Stage Autofocus for Micro-Assembly Based on Joint Spatial-Frequency Image Quality Assessment [PDF]
Journal of ImagingReliable autofocus is a fundamental prerequisite for precise positioning in micro-assembly systems, where complex reflections, scale variations, and narrow depth-of-field often degrade the robustness of traditional sharpness metrics.
Jianpeng Zhang +4 more
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Sensors, 2023 For assembly of trans-scale micro-device capsule fill tube assemblies (CFTA) for inertial confinement fusion (ICF) targets, a high-precision space assembly approach based on micro-vision is proposed in this paper. The approach consists of three modules: (
Juan Zhang, Xi Dai, Wenrong Wu, Kai Du
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Micro-Assembly Error Control of Specialized MEMS Friction Sensor [PDF]
MicromachinesA skin friction sensor is a three-dimensional MEMS sensor specially designed for measuring the skin friction of hypersonic vehicle models. The accuracy of skin friction measurement under hypersonic laminar flow conditions is closely related to the ...
Wei Zhou +4 more
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Results in Physics, 2022 This paper investigates the double dielectrics enhancement LDMOS (DDE LDMOS) with high-k field dielectric and low-k buried dielectric. The analytical models of the potential and electric field, optimal breakdown voltage and drift doping concentration are
Jiafei Yao +8 more
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On secrecy performance analysis of multi-antenna STAR-RIS-assisted downlink NOMA systems
EURASIP Journal on Advances in Signal Processing, 2022 To accommodate the stringent requirements of enhanced coverage quality and improved spectral efficiency, simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-aided communication has been perceived as an interesting ...
Shu Xu +4 more
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On secrecy outage probability for downlink NOMA systems with relay–antenna selection
EURASIP Journal on Advances in Signal Processing, 2022 Secure transmission is essential for future non-orthogonal multiple access (NOMA) system. This paper investigates relay–antenna selection to enhance physical-layer security of cooperative NOMA system in the presence of an eavesdropper, where multiple ...
Shu Xu +4 more
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Aligning parts for micro assemblies [PDF]
Assembly Automation, 2002 Orienting parts that measure only a few micrometers in diameter introduces several challenges that need not be considered at the macro‐scale. First, there are several kinds of sticking effects due to Van der Waals forces and static electricity, which complicate hand‐off motions and release of a part. Second, the degrees of freedom of micro‐manipulators
Moll, Mark +3 more
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A Methodology for the Selection of Micro-Assembly Techniques [PDF]
American Journal of Engineering and Applied Sciences, 2010 Problem statement: The study addressed the problem of selecting the appropriate microassembly techniques according to the micro-part features. Actually, in the micro-domain, the choice of the correct assembly technique is highly dependent on the micro-part characteristics such as shape, geometry and material.
ANTONELLI D +3 more
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A Miniaturized Wideband Planar Bow-Tie Slot Antenna with Asymmetric CPW
International Journal of Antennas and Propagation, 2022 In this paper, a novel miniaturized wideband planar bow-tie slot antenna is proposed. For the purpose of miniaturization and wide bandwidth, the effects of the dimension and shape of the bow-tie slot and feed structure are analyzed. This antenna adopts a
Xi Chen +3 more
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Secure transmission for cooperative NOMA systems with source‐relay selection
IET Communications, 2021 Both cooperative non‐orthogonal multiple access (NOMA) and physical layer security (PLS) are promising techniques for future communication systems. This paper investigates the PLS performance of a cooperative NOMA system where multiple sources transmit a
Shu Xu +4 more
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