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Your search keyword '"Zhuge, Xiaodong"' showing total 35 results
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35 results on '"Zhuge, Xiaodong"'

3. High-Level Algorithm Prototyping: An Example Extending the TVR-DART Algorithm

Author

Ringh, Axel, Zhuge, Xiaodong, Palenstijn, Willem Jan, Batenburg, Kees Joost, Öktem, Ozan, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Kropatsch, Walter G., editor, Artner, Nicole M., editor, and Janusch, Ines, editor

Published
2017
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4. Accurate Microwave Imaging of Concave Targets Based on High-Order Scattering Separation Using Modified Complex Exponential Model

Author

Xing, Baige, Zhuge, Xiaodong, and Si, Weikang

Abstract

Microwave and millimeter-wave (MMW) imaging is an important technique for target detection and classification. However, the accuracy of image reconstruction can be significantly affected when dealing with complex concave targets due to strong high-order scattering. Since the majority of information on the target shape is contained in the scattered waves, which exhibit only first-order interactions with the object, separating high-order scattered waves can be beneficial in reducing the artifacts during the imaging of concave targets. In this article, a novel technique based on high-order scattering signal separation is proposed for accurate imaging of concave structures. The modified complex exponential (MCE) model is applied to separate the entire scattering signal into several components. According to the phase difference of the odd and even reflection times (RTs), the two types of scattering components can be classified and recognized. Furthermore, by considering the interleaving of distance relationship between these components, it is possible to separate the first reflection from high-order odd reflections. Through elimination of the high-order scattering components, the artifacts can be significantly reduced, leading to imaging results that closely resemble the actual structure of the target. The simulation and measurement results of both typical and complex concave targets verify the effectiveness and practicability of the proposed method.

Published
2024
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21. Rapid low dose electron tomography using a direct electron detection camera

Author

Migunov, Vadim, Ryll, Henning, Zhuge, Xiaodong, Simson, Martin, Strueder, Lothar, Batenburg, Joost, Houben, Lothar, Dunin-Borkowski, Rafal E., and Scientific Computing

Subjects
Physics::Medical Physics, ddc:000, Engineering sciences. Technology, Article
Abstract

We demonstrate the ability to record a tomographic tilt series containing 3487 images in only 3.5 s by using a direct electron detector in a transmission electron microscope. The electron dose is lower by at least one order of magnitude when compared with that used to record a conventional tilt series of fewer than 100 images in 15-60 minutes and the overall signal-to-noise ratio is greater than 4. Our results, which are illustrated for an inorganic nanotube, are important for ultra-low-dose electron tomography of electron-beam-sensitive specimens and real-time dynamic electron tomography of nanoscale objects with sub-ms temporal resolution.

Published
2015

34. In-situ STEM imaging of growth and phase change of individual CuAl X precipitates in Al alloy.

Author

Liu C, Malladi SK, Xu Q, Chen J, Tichelaar FD, Zhuge X, and Zandbergen HW

Abstract

Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron microscopy (S/TEM) while heating an Al-Cu alloy, we were able to follow the growth of individual nanoprecipitates at atomic scale. The heat treatments carried out at 140, 160, 180 and 200 °C reveal a temperature dependence on the kinetics of precipitation and three kinds of interactions of nano-precipitates. These are precipitate-matrix, precipitate-dislocation, and precipitate-precipitate interactions. The diffusion of Cu and Al during these interactions, results in diffusion-controlled individual precipitate growth, an accelerated growth when interactions with dislocations occur and a size dependent precipitate-precipitate interaction: growth and shrinkage. Precipitates can grow and shrink at opposite ends at the same time resulting in an effective displacement. Furthermore, the evolution of the crystal structure within an individual nanoprecipiate, specifically the mechanism of formation of the strengthening phase, θ', during heat-treatment is elucidated by following the same precipitate through its intermediate stages for the first time using in-situ S/TEM studies.

Published
2017
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35. Rapid low dose electron tomography using a direct electron detection camera.

Author

Migunov V, Ryll H, Zhuge X, Simson M, Strüder L, Batenburg KJ, Houben L, and Dunin-Borkowski RE

Abstract

We demonstrate the ability to record a tomographic tilt series containing 3487 images in only 3.5 s by using a direct electron detector in a transmission electron microscope. The electron dose is lower by at least one order of magnitude when compared with that used to record a conventional tilt series of fewer than 100 images in 15-60 minutes and the overall signal-to-noise ratio is greater than 4. Our results, which are illustrated for an inorganic nanotube, are important for ultra-low-dose electron tomography of electron-beam-sensitive specimens and real-time dynamic electron tomography of nanoscale objects with sub-ms temporal resolution.

Published
2015
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