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2,281 results on '"Li, Wenqiang"'

101. Research progress in induction implant welding of thermoplastic composites

Author

REN Rong, LI Wenqiang, CHEN Hao, ZHANG Chengshuang, and LIU Siyang

Subjects
thermoplastic composites, induction implant welding, heating mechanism, temperature field uniformity, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Induction implant welding (IIW) of thermoplastic composites (TPC) is a new technology which uses the heat from the electromagnetic induction heating element implanted in the lap region of TPC laminate under the action of high-frequency alternating magnetic field to melt the thermoplastic resin in the interface area to achieve the connection of TPC structure. The technology has the advantages of simple operation, green efficiency, non-contact, etc., and has received extensive attention from the industrial sector in the past 30 years. Focusing on the IIW process of TPC, the influence of heat generation mechanism, heating effect, welding process parameters on the performance of welding joints was systematically introduced in this paper. Among them, the causes of uneven temperature in the welding area were explained, the method of regulating the temperature distribution in the welding area was presented, and the relationship between the uniformity of the temperature field and the quality of the welded joint was revealed. Finally, some problems faced by the APC structure IIW technology and its future development directions were also discussed.

Published
2023
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102. A game theoretical approach to homothetic robust forward investment performance processes in stochastic factor models

Author

Li, Juan, Li, Wenqiang, and Liang, Gechun

Subjects
Quantitative Finance - Portfolio Management, Mathematics - Probability, Quantitative Finance - Mathematical Finance, 91G10, 91G80, 49N90
Abstract

This paper studies an optimal forward investment problem in an incomplete market with model uncertainty, in which the underlying stocks depend on the correlated stochastic factors. The uncertainty stems from the probability measure chosen by an investor to evaluate the performance. We obtain directly the representation of the homothetic robust forward performance processes in factor-form by combining the zero-sum stochastic differential game and ergodic BSDE approach. We also establish the connections with the risk-sensitive zero-sum stochastic differential games over an infinite horizon with ergodic payoff criteria, as well as with the classical robust expected utilities for long time horizons. Finally, we give an example to illustrate that our approach can be applied to address a type of robust forward investment performance processes with negative realization processes., Comment: 36 pages

Published
2020

103. Force and acceleration sensing with optically levitated nanogram masses at microkelvin temperatures

Author

Monteiro, Fernando, Li, Wenqiang, Afek, Gadi, Li, Chang-ling, Mossman, Michael, and Moore, David C.

Subjects
Physics - Optics, Physics - Instrumentation and Detectors, Quantum Physics
Abstract

This paper demonstrates cooling of the center-of-mass motion of 10 $\mu$m-diameter optically levitated silica spheres to an effective temperature of $50\pm22 \mu$K, achieved by minimizing the technical pointing noise of the trapping laser. This low noise leads to an acceleration and force sensitivity of $95\pm41$ n$g/\sqrt{\mathrm{Hz}}$ ($g = 9.8$ m/s$^2$) and $0.95\pm0.11$ aN$/\sqrt{\mathrm{Hz}}$, respectively, at frequencies near 50 Hz. This force sensitivity is comparable to that demonstrated for optically levitated nanospheres that are $10^4$ times less massive, corresponding to an acceleration sensitivity that is several orders of magnitude better. It is further shown that under these conditions the spheres remain stably trapped at pressures of $\sim 10^{-7}$ mbar with no active cooling for periods longer than a day. Feedback cooling is still necessary in the moderate-pressure regime, motivating a comprehensive study of the loss mechanisms of the microspheres and providing better understanding of the requirements for feedback-free optical trapping in vacuum. This work can enable high-sensitivity searches for accelerations and forces acting on micron-sized masses, including those that could be produced by new physics beyond the Standard Model.

Published
2020
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104. The crystal structure of poly[2-(4-carboxypyridin-3-yl)terephthalpoly[diaqua-(μ4-2-(6-carboxylatopyridin-3-yl)terephthalato-κ5O,N:O′:O″,O‴)]) cadmium(II)] dihydrate, C28H20Cd3N2O16

Author

Li Wenqiang and Zhang Jingxiao

Subjects
2285912, Physics, QC1-999, Crystallography, QD901-999
Abstract

C28H20Cd3N2O16, triclinic, P1‾$P\overline{1}$ (no. 2), a = 7.3205(3) Å, b = 9.9488(5) Å, c = 10.0326(5) Å, α = 104.473(4)°, β = 91.566(4)°, γ = 90.191(4)°, V = 707.19(6) Å3, Z = 1, Rgt(F) = 0.0239, wRref(F2) = 0.0576, T = 293 K.

Published
2023
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117. Fully coupled mean-field FBSDEs with jumps and related optimal control problems

Author

Li, Wenqiang and Min, Hui

Subjects
Mathematics - Optimization and Control, Mathematics - Probability
Abstract

This paper study a type of fully coupled mean-field forward-backward stochastic differential equations with jumps under the monotonicity condition, including the existence and the uniqueness of the solution of our equation as well as the continuity property of the solutions with respect to the parameters. Then we establish the stochastic maximum principle for the corresponding optimal control problems and give the applications to mean-variance portfolio problems and linear-quadratic problems, respectively., Comment: 25 pages

Published
2018

118. Flexible control of an ultrastable levitated orbital micro-gyroscope through orbital-translational coupling

Author

Li Wenqiang, Wang Xia, Liu Jiaming, Li Shuai, Li Nan, and Hu Huizhu

Subjects
laser trapping, optical manipulation, optical tweezers, Physics, QC1-999
Abstract

Introducing rotational degree of control into conventional optical tweezers promises unprecedented possibilities in physics, optical manipulation, and life science. However, previous rotational schemes have largely relied upon the intrinsic properties of microsphere anisotropy—such as birefringence or amorphous shape—which involves sophisticated fabrication processes and is limited in their application range. In this study, we demonstrated the first experimental realization of orbiting a homogeneous microsphere by exploiting angular momentum in a transversely rotating optical trap. The high level of rotational control allows us to explore orbital-translational coupling and realize an ultra-stable micro-gyroscope of considerable value. The dynamics of orbital levitated particle was theoretically characterized using a simple model. Our proposed method provided a novel way to qualitatively characterize optical trap features. In the future, the approach could pave the way for investigating rotational opto-mechanics, rotational ground state cooling, and the study of ultra-sensitive angular measurement.

Published
2023
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124. Genome sequencing reveals evidence of adaptive variation in the genus Zea

Author

Chen, Lu, Luo, Jingyun, Jin, Minliang, Yang, Ning, Liu, Xiangguo, Peng, Yong, Li, Wenqiang, Phillips, Alyssa, Cameron, Brenda, Bernal, Julio S., Rellán-Álvarez, Rubén, Sawers, Ruairidh J. H., Liu, Qing, Yin, Yuejia, Ye, Xinnan, Yan, Jiali, Zhang, Qinghua, Zhang, Xiaoting, Wu, Shenshen, Gui, Songtao, Wei, Wenjie, Wang, Yuebin, Luo, Yun, Jiang, Chenglin, Deng, Min, Jin, Min, Jian, Liumei, Yu, Yanhui, Zhang, Maolin, Yang, Xiaohong, Hufford, Matthew B., Fernie, Alisdair R., Warburton, Marilyn L., Ross-Ibarra, Jeffrey, and Yan, Jianbing

Published
2022
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126. An Improved NAMLab Image Segmentation Algorithm Based on the Earth Moving Distance and the CIEDE2000 Color Difference Formula

Author

Zheng, Yunping, Xu, Yuan, Qiu, Shengjie, Li, Wenqiang, Zhong, Guichuang, Chen, Mingyi, Sarem, Mudar, 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, Huang, De-Shuang, editor, Jo, Kang-Hyun, editor, Jing, Junfeng, editor, Premaratne, Prashan, editor, Bevilacqua, Vitoantonio, editor, and Hussain, Abir, editor

Published
2022
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127. Supply Chain Financing Decision and Financing Value Under Cap-and-Trade Regulation

Author

Huang, Xiaohui, He, Juan, Li, Wenqiang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, 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, 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, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, 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, and Zhang, Zhenyuan, editor

Published
2022
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128. MobiTrack: Mobile Crowdsensing-Based Object Tracking with Min-Region and Max-Utility

Author

Li, Wenqiang, Tao, Jun, Wang, Zuyan, Xu, YiFan, Tang, Xiaolei, Dong, YiChao, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Lai, Yongxuan, editor, Wang, Tian, editor, Jiang, Min, editor, Xu, Guangquan, editor, Liang, Wei, editor, and Castiglione, Aniello, editor

Published
2022
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139. A national survey on how to improve traditional Chinese medicine learning internationally: Perceptions from both teachers and students

Author

Zhu, Yuhang, Wu, Yan, Zhang, Hao, Zhao, Yanfei, Ren, Yule, Hu, Wei, Li, Pan, Wang, Huiyi, Wang, Ying, Zhang, Boda, Wang, Yujie, Yuan, Hongwen, Zhang, Jiping, Li, Wenqiang, Zhao, Yufang, Zhao, Jie, Shi, Yedong, Shu, Yanye, Zhang, Xiao, Sun, Yan, Yu, Sheng, Yang, Ling, Geng, Zhenbo, Chen, Jiali, Lv, Kun, Wang, Weilin, Xue, Wenjuan, Gu, Yinger, Wang, Fangfang, Xu, Xiangrong, and Qu, Fan

Published
2022
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