Results 51 to 60 of about 382,794 (354)

Thermoreflectance Detection of Point Defects Resulting from Focused Ion Beam Milling

Advanced Engineering Materials, EarlyView.
Focused ion beam (FIB) milling is a common tool for nanoscale material processing, however irradiation damage, redeposition, and contamination can occur. We use several characterization tools to show FIB‐induced effects beyond 1 mm from the milled area.
Thomas W. Pfeifer, Eric R. Hoglund, Anton V. Ievlev, Patrick E. Hopkins   +3 more
wiley   +1 more source

Multi‐target cognitive electronic reconnaissance for unmanned aerial vehicles based on scene reconstruction

IET Radar, Sonar & Navigation
Model‐free deep reinforcement learning (DRL) is regarded as an effective approach for multi‐target cognitive electronic reconnaissance (MCER) missions. However, DRL networks with poor generalisation can significantly reduce mission completion rates when ...
Yun Zhang, Shixun You, Yunbin Yan, Qiaofeng Ou, Jie Liu, Ling Chen, Xiang Zhu   +6 more
doaj   +1 more source

Research into a Consistency Cooperative Control Method for Attitude Orbit Coupling of SAR Satellite Formations under Communication Constraints

Aerospace, 2022
To solve the problem of communication delays and topology changes and achieve a high-precision formation configuration control index in the flight control of SAR (synthetic aperture radar) satellite formations, this paper studies the consistency ...
Bing Hua, Shengjun Zhong, Yunhua Wu, Zhiming Chen   +3 more
doaj   +1 more source

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source

Comparative Analysis of Dynamic Models and Adaptive Process-Noise Modeling for Kalman-Based Aerial Target Tracking

IEEE Access
Accurate target tracking is essential for the effectiveness of air surveillance, air-traffic monitoring, and defense-support systems. This paper presents a comparative study of several dynamic motion models applied to Kalman-based filters for aerial ...
Arthur Medeiros Macedo, Karl Heinz Kienitz   +1 more
doaj   +1 more source

Good-Quality and High-Efficiency Dicing for Thick LiNbO₃ Wafers Using Picosecond Laser Pulses

Micromachines, 2019
Lithium niobate (LiNbO3) has become popular with applications in electronics and communication industries due to its excellent electro-optical and nonlinear properties.
Mingwei Lei, Wenyan Gao, Guang Li, Xinping Wu, Benhai Li, Xuefeng Wang, Junlong Wang   +6 more
doaj   +1 more source

Analysis and Demonstration of First Cross-Support Interferometry Tracking in China Mars Mission

Remote Sensing, 2022
Delta-Differential One-Way Ranging (DeltaDOR) is widely used in deep spacecraft navigation, and cross support could enhance navigation accuracy with more interferometry baselines and longer baseline.
Songtao Han, Haijun Man, Mei Wang, Zhijin Zhou, Jianfeng Cao, Wei Gao, Lue Chen, Jinsong Ping   +7 more
doaj   +1 more source

Specification guidelines for hybrid microcircuits [PDF]

, 1972
Guidelines establishing manufacturing and control procedures for hybrid microcircuits used in aerospace programs may have possible commercial and industrial applications.
Caruso, S. V.
core   +1 more source

Electrochemical Evaluation of Compressed Selective Laser Melted AlSi7Mg and AlSi10Mg Alloys in Chloride Environment

Advanced Engineering Materials, EarlyView.
The corrosion performance of AlSi7Mg and AlSi10Mg alloys produced through selective laser melting (SLM) was examined under compressive stress in a chloride environment. Electrochemical analyses, including open‐circuit potential (OCP), potentiodynamic polarization (CPP), and electrochemical impedance spectroscopy (EIS), were complemented by scanning ...
Femi John Akinfolarin, Samson Dare Oguntuyi, Peter Apata Olubambi   +2 more
wiley   +1 more source

Development of a new four-disc friction-free ball valve

You-qi chuyun, 2021
In order to solve the problems of large operating torque, easy internal leakage and poor anti-fouling capability of the general ball valves in the oil and gas pipelines, a new type of four-disc friction-free ball valve was designed based on the existing ...
Yulong FENG, Kangxin YANG, Changqun YANG, Xinfeng YANG, Zhenning YANG   +4 more
doaj   +1 more source