Design of On-line UPS Based on Boost Converter

Chunyang Gu,Zhibing Yang,Chunling Yang,Mengda Yang 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

Design and build up a new on-line digital UPS based on boost topological structure with a new kind of single-chip computer, STC12C5412AD, realizing sine wave and square wave output, and shifting among 50Hz, 60 Hz, and 400Hz of the supply for adopting into different industrial standards and applications. Such UPS system contains the module of intelligent charging from storage battery and thorough security functions, characterized by the output of un-interruption and high stability, low distortion, free of interference, low cost and multi-function.

Cu nanoplates with ‘‘clean surface”: Synthesis and their enhanced biosensors performance

Xinmei Liu,Chunyang Yang,Wenlong Yang,Jiaqi Lin,Xue Zhou,Yuhang Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-

In this study, we demonstrated a one-pot synthesis of Cu nanoplates (Cu NPs) with high purity and ‘‘cleansurface”. Different from surfactant-assisted method, we tailored the architecture by controlling the ripeningtime of Cu seeds. Citrate is introduced as a structure-directing agent. Since the ‘‘clean surface” providemore available active sites, the as-prepared Cu NPs show a superior performance when utilized in thenon-enzymatic biosensors. In the detection of nitrite, the sensor constructed by Cu NPs exhibited a superiorsensitivity (303.1 ± 10.18 mAmM1cm2), and the detection range is 5.0 mM. On the contrary, sensitivityfor the Cu NPs by surfactant-assisted method is negligible. As applied in the glucose sensors,detection range by Cu NPs could reach 36.0 mM. And the sensitivity under ambient condition (298 K)is 561.93 ± 3.72 mAmM1cm2, which is ca. 2.11-folds higher than that for Cu NPs by surfactantassistedmethod. In the detection of H2O2, detection range is 10.0 mM, and the enhancement factor fordetection range is up to 2.0-folds. The superior performance can also be extended to the catalysis forthe reduction of 4-nitro-phenol. Since no additional noble metals was applied, this strategy would openup a new avenue for utilizing non-noble metals.

Surfactant-free synthesis of CuBr NPs decorated by Pt for glucose and nitrite sensors

Xinmei Liu,Xue Zhou,Chunyang Yang,Wenlong Yang,Gang Liu,Yuhang Li,Guangyu Zhang,Xu Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-

The high cost and narrow detection range of electrocatalyst are the two major challenges for the electrochemicalbiosensors. This work provided a surfactant-free synthesis of CuBr@Pt nanoparticles (CuBr@PtNPs) with controllable Pt loading rates. The introduction of chloroplatinic acid (H2PtCl6) and an elevatedsynthesis temperature resulted in a high surface area for CuBr@Pt NPs. The abundant active sites enabledthe CuBr@Pt NPs a superior performance as applied in glucose and nitrite detection. Moreover, an optimalPt loading would be conducive to optimize sensor performances of CuBr@Pt NPs. In the glucose detection,the sensor by CuBr@Pt-15% could reach the detection concentration up to 68.0 mM, which was 1.9 timeshigher than that by pure CuBr. And the corresponding sensitivity by CuBr@Pt-15% was calculated to be382.73 lA/mMcm2. In the detection of sodium nitrite, CuBr@Pt-15% also revealed a superior behaviorthan previous work. And the detection concentration (by the linear sweep voltammetry) was form 0 to80.0 mM. This work demonstrated the superior biosensor performance of CuBr@Pt-15%, which offereda promising material for sensor with wider detection range and rationalized cost.

Chattering-free Fast Fixed-time Sliding Mode Control for Uncertain Robotic Manipulators

Huayang Sai,Zhenbang Xu,Enyang Zhang,Chunyang Han,Yang Yu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

In this paper, we introduce a dynamic controller that dedicates fixed-time trajectory tracking for uncertain robotic manipulators. First, a new nonlinear function is designed and applied to the fixed-time sliding mode (FSM) surface. The derivative of the proposed nonlinear function is continuous, which can ensure the continuity and smoothness of the control torque, and it makes the sliding surface facilitate fast convergence rates of the system tracking error. Then, a FSM control scheme is designed using the proposed sliding mode surface. Combined the Lyapunov stability theory, we show that the proposed controller has fixed-time convergence independent of the initial state of the system. Moreover, the proposed control scheme is advantageous in that the control torque is continuous without transient change. This eliminates the chattering of uncertain robotic manipulators and makes the control torque smoother. Simulation results show that a faster error convergence rate can be obtained with a smaller control torque range. Finally, the above-mentioned effectiveness and superiority of the proposed control scheme are validated using simulations and experimental results.

Manufacture and Characterization on Three-Dimensional Random Resonators of Porous Silicon/TiO2 Nanowires for Continuous Light Pumping Lasing of Perovskite Quantum Dots

Yining Mu,Tuo Zhang,Tianqi Chen,Fanqi Tang,Jikai Yang,Chunyang Liu,Zhangxiaoxiong Chen,Yiming Zhao,Peng Du,Haibo Fan,Yan Zhu,Guozhen Liu,Ping Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03

In recent years, all inorganic bismuth lead-halide perovskite nanocrystals [CsPbX3 (X=Cl, Br, I)] have received extensive attention due to their high performance in fluorescence quantum yield, narrow emission spectrum, and adjustable emission range. However, the disadvantages of high cost and poor stability have greatly limited the development prospects of the material. Here, in order to develop a perovskite quantum dot lasing cavity with high chemical stability, high quality factor and low fabrication cost, we have successfully fabricated a 3D random cavity device based on porous silicon/TiO2 nanowires. A TiO2 nanowire is grown on the porous silicon to form a 3D resonant cavity, and a perovskite quantum dot is spin-coated on the surface of the 3D resonant cavity to form a novel 3D complex film. The novel structure enhances the chemical stability and lasing quality factor of the resonant cavity while the fluorescence generated by the large quantum dots in the spatial interference structure constitutes the feedback loop, which will provide favorable support for the development of information optics.

Shifting the struggle inward: Mainstream debate on digital grassroots feminism in China

Chun YANG,Yongyuan ZHOU Asian Center for Women's Studies : Ewha Womans Uni 2023 Asian Journal of Women's Studies(AJWS) Vol.29 No.1

This research suggests that the legitimacy of Chinese feminist public opinion is reflected in mainstream digital grassroots feminism. The authors investigate the use of feminist discourse in the Chinese Internet with the aim of highlighting and focusing current discussions among grassroots feminists in China. This research reveals that mainstream debates revolve around radical and conservative feminism. We propose that there is an emerging radical force in the mainstream debate, which is conceptualized as “new feminist activism.” It tries to separate itself from national and sexual politics, and has evolved from western radical feminism, separatist feminism, and socialist feminism in China. In addition, new feminist activism is labeled as extreme feminism and pseudo-feminism and is not only criticized by conservatives such as liberal feminists and socialist feminists but is also ruled by the state for ideological control. Appropriation of feminist discourses by grassroots feministshaveledtopositionsof different groups splitting, and there is an intense internal fight for power over discourse. In general, digital feminism in China is characterized by a focus on the private sphere, de-political, and indirect confrontation. 本研究表明,中国女性主义舆论的合法性体现在主流数字草根女性主义中。作者调查了中国互联网中女性主义话语的使用情况,目的是突出和聚焦中国草根女性主义者的当前讨论。这项研究显示,主流辩论围绕着激进和保守的女性主义展开。我们提出,在主流辩论中,有一股新兴的激进力量,被概念化为 “新激进女性主义"。它试图与国家政治和性政治分开,并从西方的激进女性主义、分离主义女性主义和中国的社会主义女性主义中发展而来。此外,新激进女性主义被贴上了极端女性主义和伪女性主义的标签,不仅受到自由主义女性主义者和社会主义女性主义者等保守派的批评,而且还受到国家意识形态控制的统治。草根女性主义者对女性主义话语的挪用,导致不同群体的立场发生分裂,内部对话语权的争夺十分激烈。总的来说,中国的数字女性主义的特点是注重私人领域、去政治化以及间接对抗。

Behaviors of box-shape steel reinforced concrete composite beam

Chun Yang,Jian Cai,Yi Wu,Jiangang He,Haifeng Chen 국제구조공학회 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.4