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3,352 results on '"CUI Bo"'

115. ATDG: An Automatic Cyber Threat Intelligence Extraction Model of DPCNN and BIGRU Combined with Attention Mechanism

Author

Cui, Bo, Li, Jinling, Hou, Wenhan, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Zhang, Feng, editor, Wang, Hua, editor, Barhamgi, Mahmoud, editor, Chen, Lu, editor, and Zhou, Rui, editor

Published
2023
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135. Encounter of Parker Solar Probe and a Comet-like Object During Their Perihelia: Model Predictions and Measurements

Author

He, Jiansen, Cui, Bo, Yang, Liping, Hou, Chuanpeng, Zhang, Lei, Ip, Wing-Huen, Jia, Yingdong, Dong, Chuanfei, Duan, Die, Zong, Qiugang, Bale, Stuart D., Pulupa, Marc, Bonnell, John W., de Wit, Thierry Dudok, Goetz, Keith, Harvey, Peter R., MacDowall, Robert J., and Malaspina, David M.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics, Physics - Space Physics
Abstract

Parker Solar Probe (PSP) aims at exploring the nascent solar wind close to the Sun. Meanwhile, PSP is also expected to encounter small objects like comets and asteroids. In this work, we survey the ephemerides to find a chance of recent encounter, and then model the interaction between released dusty plasmas and solar wind plasmas. On 2019 September 2, a comet-like object 322P/SOHO just passed its perihelion flying to a heliocentric distance of 0.12 au, and swept by PSP at a relative distance as close as 0.025 au. We present the dynamics of dust particles released from 322P, forming a curved dust tail. Along the PSP path in the simulated inner heliosphere, the states of plasma and magnetic field are sampled and illustrated, with the magnetic field sequences from simulation results being compared directly with the in-situ measurements from PSP. Through comparison, we suggest that 322P might be at a deficient activity level releasing limited dusty plasmas during its way to becoming a "rock comet". We also present images of solar wind streamers as recorded by WISPR, showing an indication of dust bombardment for the images superposed with messy trails. We observe from LASCO coronagraph that 322P was transiting from a dimming region to a relatively bright streamer during its perihelion passage, and simulate to confirm that 322P was flying from relatively faster to slower solar wind streams, modifying local plasma states of the streams.

Published
2020
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136. Anomalous stopping of laser-accelerated intense proton beam in dense ionized matter

Author

Ren, Jieru, Deng, Zhigang, Qi, Wei, Chen, Benzheng, Ma, Bubo, Wang, Xing, Yin, Shuai, Feng, Jianhua, Liu, Wei, Hoffmann, Dieter H. H., Wang, Shaoyi, Fan, Quanping, Cui, Bo, He, Shukai, Cao, Zhurong, Zhao, Zongqing, Cao, Leifeng, Gu, Yuqiu, Zhu, Shaoping, Cheng, Rui, Zhou, Xianming, Xiao, Guoqing, Zhao, Hongwei, Zhang, Yihang, Zhang, Zhe, Li, Yutong, Wu, Dong, Zhou, Weimin, and Zhao, Yongtao

Subjects
Physics - Plasma Physics
Abstract

Ultrahigh-intensity lasers (10$^{18}$-10$^{22}$W/cm$^{2}$) have opened up new perspectives in many fields of research and application [1-5]. By irradiating a thin foil, an ultrahigh accelerating field (10$^{12}$ V/m) can be formed and multi-MeV ions with unprecedentedly high intensity (10$^{10}$A/cm$^2$) in short time scale ($\sim$ps) are produced [6-14]. Such beams provide new options in radiography [15], high-yield neutron sources [16], high-energy-density-matter generation [17], and ion fast ignition [18,19]. An accurate understanding of the nonlinear behavior of beam transport in matter is crucial for all these applications. We report here the first experimental evidence of anomalous stopping of a laser-generated high-current proton beam in well-characterized dense ionized matter. The observed stopping power is one order of magnitude higher than single-particle slowing-down theory predictions. We attribute this phenomenon to collective effects where the intense beam drives an decelerating electric field approaching 1GV/m in the dense ionized matter. This finding will have considerable impact on the future path to inertial fusion energy., Comment: 8 pages, 4 figures

Published
2020
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144. Polystyrene negative resist for high-resolution electron beam lithography

Author

Ma Siqi, Con Celal, Yavuz Mustafa, and Cui Bo

Subjects
Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract We studied the exposure behavior of low molecular weight polystyrene as a negative tone electron beam lithography (EBL) resist, with the goal of finding the ultimate achievable resolution. It demonstrated fairly well-defined patterning of a 20-nm period line array and a 15-nm period dot array, which are the densest patterns ever achieved using organic EBL resists. Such dense patterns can be achieved both at 20 and 5 keV beam energies using different developers. In addition to its ultra-high resolution capability, polystyrene is a simple and low-cost resist with easy process control and practically unlimited shelf life. It is also considerably more resistant to dry etching than PMMA. With a low sensitivity, it would find applications where negative resist is desired and throughput is not a major concern.

Published
2011

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