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3. Unveiling microstructural damage for leakage current degradation in SiC Schottky diode after heavy ions irradiation under 200 V

Author

Yan, Xiaoyu, Zhai, Pengfei, Yang, Chen, Zhao, Shiwei, Nan, Shuai, Hu, Peipei, Zhang, Teng, Chen, Qiyu, Xu, Lijun, Li, Zongzhen, and Liu, Jie

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

Single-event burnout and single-event leakage current (SELC) in SiC power devices induced by heavy ions severely limit their space application, and the underlying mechanism is still unclear. One fundamental problem is lack of high-resolution characterization of radiation damage in the irradiated SiC power devices, which is a crucial indicator of the related mechanism. In this letter, high-resolution transmission electron microscopy (TEM) was used to characterize the radiation damage in the 1437.6 MeV 181Ta-irradiated SiC junction barrier Schottky diode under 200 V. The amorphous radiation damage with about 52 nm in diameter and 121 nm in length at the Schottky metal (Ti)-semiconductor (SiC) interface was observed. More importantly, in the damage site the atomic mixing of Ti, Si, and C was identified by electron energy loss spectroscopy and high-angle annular dark-field scanning TEM. It indicates that the melting of the Ti-SiC interface induced by localized Joule heating is responsible for the amorphization and the formation of titanium silicide, titanium carbide, or ternary phases. These modifications at nanoscale in turn cause the localized degradation of the Schottky contact, resulting in the permanent increase in leakage current. This experimental study provides very valuable clues to thorough understanding of the SELC mechanism in SiC diode., Comment: 4 pages,4 figures

Published
2023
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5. A Multi-frequency Magnetic Particle Spectroscopy System for the Characterization of Magnetic Nanoparticles

Author

Sun, Shaoqi, Sun, Shijie, Xu, Lijun, and Zhong, Jing

Subjects
Physics - Applied Physics
Abstract

Magnetic particle spectroscopy (MPS) is one of the most versatile methods to characterize the magnetic properties of magnetic nanoparticles (MNPs). The excitation magnetic field is one of the most crucial factors that affects the MPS signal of the MNPs. In this study, a multi-frequency MPS system is developed to investigate the MPS signal of MNPs in different ac magnetic fields. The MPS system consists of a multi-channel excitation module for the generation of different-frequency ac magnetic fields and a detection module for the measurement of the magnetic response of the MNPs. The MPS system allows to generate ac magnetic fields with a frequency up to 32.6 kHz and amplitude up to 25 mT. The MPS signals of the MNPs in different ac magnetic fields are measured to systematically evaluate the performance of the multi-frequency MPS system, including the MNP spectra and its dynamic magnetization curve. In addition, the signal-to-noise ratio (SNR) of the MPS system is quantitively assessed with measured MPS signals of a given MNP sample and DI water. Furthermore, a series of MNP samples with different iron concentrations are prepared and measured to evaluate the limit-of-detection (LOD) in terms of iron concentration. The influence of the excitation magnetic field, including frequency and amplitude, is discussed based on the SNRs of the measured harmonics. Experimental results show that the LOD is 2.3 ng in terms of iron., Comment: 7 pages, 12 figures

Published
2023

7. Multi-objective Optimization Method for Propeller and Motor Size Selection in Electric Propulsion Systems for Unmanned Aerial Vehicles

Author

Zhao, Tianming, Zhang, Shaohui, Xu, Lijun, Mao, Yinian, Wu, Haotian, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor

Published
2024
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8. Kinematics Study of Swashplateless Propellers

Author

Zhang, Yifei, Liu, Lu, Xu, Lijun, Mao, Yinian, Wu, Haotian, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor

Published
2024
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9. Effect of UAV Configuration on Noise: Experimental Investigation and Analysis

Author

Zhao, Longzhi, Zhao, Tianming, Xu, Lijun, Mao, Yinian, Wu, Haotian, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor

Published
2024
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10. Leader-Follower Formation Control of Non-holonomic Robots with Collision Avoidance by Using Artificial Potential Field

Author

Yang, Rui, Sun, Shaoxin, Ma, Tiedong, Su, Xiaojie, Li, Yayong, Xu, Lijun, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Wang, Qing, editor, Dong, Xiwang, editor, and Song, Peng, editor

Published
2024
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11. Let Go of the Non-digital Past: Embracing the 4Rs for a New Life - Recallable, Relaxing, Repayable, and Reconnected Experiences

Author

Lyu, You, Hu, Jiayi, Wang, Ziyi, Xiong, Jiaqing, Liu, Mingjun, Lyu, Hao, He, Xindi, Lu, Jiayi, Yong, Cheng, Wang, Zhen, Xu, Lijun, Xiao, Mengzhen, Huang, Taiyu, Huang, Ruonan, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Marcus, Aaron, editor, Rosenzweig, Elizabeth, editor, and Soares, Marcelo M., editor

Published
2024
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12. Design of Fuzzy Variable Frequency Control System for Local Ventilator

Author

Jia, Tianyi, Xu, Lijun, Chen, Zhifeng, Mi, Luxiang, Su, Xin, Zhu, Di, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Yadav, Sanjay, editor, Arya, Yogendra, editor, Muhamad, Nor Asiah, editor, and Sebaa, Karim, editor

Published
2024
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13. Experimental Study on Transient Behavior of Proton Exchange Membrane Electrolytic Cells Under Voltage Fluctuations

Author

Su, Xin, Xu, LiJun, Hu, Bin, Zhu, Di, Mi, LuXiang, Jia, TianYi, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Yadav, Sanjay, editor, Arya, Yogendra, editor, Muhamad, Nor Asiah, editor, and Sebaa, Karim, editor

Published
2024
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15. BRCA1 secondary splice-site mutations drive exon-skipping and PARP inhibitor resistance

Author

Nesic, Ksenija, Krais, John J., Wang, Yifan, Vandenberg, Cassandra J., Patel, Pooja, Cai, Kathy Q., Kwan, Tanya, Lieschke, Elizabeth, Ho, Gwo-Yaw, Barker, Holly E., Bedo, Justin, Casadei, Silvia, Farrell, Andrew, Radke, Marc, Shield-Artin, Kristy, Penington, Jocelyn S., Geissler, Franziska, Kyran, Elizabeth, Betsch, Robert, Xu, Lijun, Zhang, Fan, Dobrovic, Alexander, Olesen, Inger, Kristeleit, Rebecca, Oza, Amit, McNeish, Iain, Ratnayake, Gayanie, Traficante, Nadia, DeFazio, Anna, Bowtell, David D. L., Harding, Thomas C., Lin, Kevin, Swisher, Elizabeth M., Kondrashova, Olga, Scott, Clare L., Johnson, Neil, and Wakefield, Matthew J.

Published
2024
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23. Thermalization Effect in semiconductor Si, and metallic silicide NiSi2, CoSi2 by using Non-Adiabatic Molecular Dynamics Approach

Author

Luo, Kun, Gan, Weizhuo, Hou, Zhaozhao, Zhan, Guohui, Xu, Lijun, Liu, Jiangtao, Lu, Ye, and Wu, Zhenhua

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Recently, cold source transistor (CSFET) with steep-slope subthreshold swing (SS) < 60 mV/decade has been proposed to overcome Boltzmann tyranny in its ballistic regime. However the scattering, especially by inelastic scattering may lead serious SS degradation through cold carrier thermalization. In this study, the electronic excitation/relaxation dynamic process is investigated theoretically by virtue of the state-of-the-art nonadiabatic molecular dynamics (NAMD) method, i.e., the mixed quantum-classical NAMD. The mixed quantum-classical NAMD considers both carrier decoherence and detailed balance to calculate the cold carrier thermalization and transfer processes in semiconductor Si, and metallic silicide (NiSi2 and CoSi2). The dependence of the thermalization factor, relaxation time, scattering time and scattering rate on energy level are obtained. The thermalization of carrier gradually increases from low energy to high energy. Partially thermalization from the ground state to reach the thermionic current window is realized with sub-100 $fs$ time scale. Fully thermalization to entail energy region depends on the barrier height sensitively, i.e., the scattering rate decreases exponentially as the energy of the out-scattering state increase. The scattering rate of NiSi2 and CoSi2 is 2 orders of magnitude higher than that of Si, arising from their higher density of states than that in Silicon This study can shed light on the material design for low power tunneling FET as well as the emerging CSFET., Comment: 14 pages, 17 figres

Published
2023

24. Effect of La-Ce Rare Earth on Inclusions and Impact Properties of Q345D Steel

Author

Luo Gang, Sui Yafei, Liu Peng, Liang Liang, Xu lijun

Subjects
la-ce rare earth treatment； q345d structural steel； transverse impact energy； inclusion modification； refine； cleanliness, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

The effects of La-Ce rare earth treatment on inclusions， continuous casting castability and steel properties of Q345D structural steel were analyzed by field test. The results showed that the alloy yield of RE in Q345D structural steel was 21. 5%. Compared with the heats without RE addition， the desulfurization rate increased by 37. 5%， and the unit inclusion density decreased from 80. 16/mm2 to 60. 78/mm2 . The inclusions in molten steel before La-Ce rare earth treat ment were mainly MgO-Al2O3-CaO composite inclusions. The modification effect of La-Ce rare earth treatment on small size （ D≤5 μm ） inclusions was more obvious. Small size inclusions were modified into （La-Ce-S） and （La-Ce-Al-S-O） rare earth inclusions. La-Ce rare earth treatment can significantly reduce the aspect ratio of MnS inclusions in steel， so that the morphology of MnS inclusions after rolling was closer to ellipse without long linear， which was the main reason for the increase of transverse impact energy of Q345D structural steel by 20%.

Published
2024
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25. A new distributionally robust reward-risk model for portfolio optimization

Author

Zhou Yijia and Xu Lijun

Subjects
distributionally robust, portfolio optimization, cvar, standard deviation, semidefinite programming, 90-10, 90b50, 90c17, 65c20, 65k10, Mathematics, QA1-939
Abstract

A new distributionally robust ratio optimization model is proposed under the known first and second moments of the uncertain distributions. In this article, both standard deviation (SD) and conditional value-at-risk (CVaR) are used to measure the risk, avoiding both fat-tail and volatility. The new model can be reduced to a simple distributionally robust model under assumptions on the measurements of reward, CVaR and SD. Furthermore, it can be rewritten as a tractable semi-definite programming problem by the duality theorem under partially known information of the uncertain parameters. Finally, the model is tested on portfolio problems and verified from numerical results that it can give a reasonable decision under only the first and second moments.

Published
2024
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27. Let Go of the Non-digital Past: Embracing the 4Rs for a New Life - Recallable, Relaxing, Repayable, and Reconnected Experiences

Author

Lyu, You, primary, Hu, Jiayi, additional, Wang, Ziyi, additional, Xiong, Jiaqing, additional, Liu, Mingjun, additional, Lyu, Hao, additional, He, Xindi, additional, Lu, Jiayi, additional, Yong, Cheng, additional, Wang, Zhen, additional, Xu, Lijun, additional, Xiao, Mengzhen, additional, Huang, Taiyu, additional, and Huang, Ruonan, additional

Published
2024
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28. Phonon-assisted charge carriers thermalization in semiconductor Si and metallic silicide NiSi2, CoSi2: A non-adiabatic molecular dynamics study.

Author

Luo, Kun, Gan, Weizhuo, Hou, Zhaozhao, Zhan, Guohui, Xu, Lijun, Liu, Jiangtao, and Wu, Zhenhua

Subjects
TUNNEL field-effect transistors, MOLECULAR dynamics, ENERGY levels (Quantum mechanics), ELECTRONIC excitation, THERMAL neutrons, CHARGE carriers, SEMICONDUCTORS
Abstract

Recently, the cold source field-effect transistor (CSFET) has emerged as a promising solution to overcome Boltzmann tyranny in its ballistic regime, offering a steep-slope subthreshold swing (SS) of less than 60 mV/decade. However, challenges arise due to scattering, particularly from inelastic scattering, which can lead to significant degradation in SS through cold carrier thermalization. In this study, we delve into the theoretical investigation of the electronic excitation/relaxation dynamic process using the state-of-the-art nonadiabatic molecular dynamics (NAMD) method. The mixed quantum-classical NAMD proves to be a powerful tool for comprehensively analyzing cold carrier thermalization and transfer processes in semiconductor Si, as well as metallic silicides (NiSi 2 and CoSi 2). The approach of mixed quantum-classical NAMD takes into account both carrier decoherence and detailed balance, enabling the calculation of thermalization factors, relaxation times, scattering times, and scattering rates at various energy levels. The thermalization of carriers exhibits a gradual increase from low to high energy levels. Achieving partial thermalization from the ground state to reach the thermionic current window occurs within a sub-100 fs time scale. Full thermalization across the entire energy spectrum depends sensitively on the barrier height, with the scattering rate exponentially decreasing as the energy of the out-scattering state increases. Notably, the scattering rate of NiSi 2 and CoSi 2 is two orders of magnitude higher than that of Si, attributed to their higher density of states compared to Si. This study not only provides insights into material design for low-power tunnel field-effect transistors but also contributes valuable information for advancing CSFET in emerging technologies. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Fanconi Anemia: Exploration of DNA Repair Pathways from Genetic Diseases to Cancer and Prospects for Treatment

Author

SHI Jinyu, XING Lin, LIU Shijia, LYU Wenhao, ZHANG Bingyan, XU Lijun, and ZHANG Yafen

Subjects
fanconi anemia pathway, dna damage repair, cancer susceptibility, prognosis, targeted therapy, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Fanconi anemia (FA) is an inheritable disorder that presents with bone marrow failure, developmental anomalies, and an increased susceptibility to cancer. The etiology of this condition stems from a genetic mutation that disrupts the proper repair of interstrand DNA cross-links (ICLs). The resultant dysregulation of the DNA damage response mechanism can induce genomic instability, thereby elevating the mutation rates and the likelihood of developing cancer. The FA pathway assumes a pivotal role in safeguarding genome stability through its involvement in the repair of DNA cross-links and the maintenance of overall genomic integrity. A mutation in the germ line of any of the genes responsible for encoding the FA protein results in the development of FA. The prevalence of aberrant FA gene expression in somatic cancer, coupled with the identification of a connection between FA pathway activation and resistance to chemotherapy, has solidified the correlation between the FA pathway and cancer. Consequently, targeted therapies that exploit FA pathway gene abnormalities are being progressively developed and implemented. This review critically examines the involvement of the FA protein in the repair of ICLs, the regulation of the FA signaling network, and its implications in cancer pathogenesis and prognosis. Additionally, it explores the potential utility of small-molecule inhibitors that target the FA pathway.

Published
2024
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