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RISS 인기검색어
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- 저자 : Zhang Penghui (검색결과 10 건)
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Zhang, Penghui,Dong, Sheying,Gu, Guangzhe,Huang, Tinglin Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
Ionic liquid-functionalized ordered mesoporous silica SBA-15 modified carbon paste electrode (CISPE) was fabricated and its electrochemical performance was investigated by cyclic voltammetry, electrochemical impedance spectra. The electrochemical behavior of $Cd^{2+}$, $Pb^{2+}$, $Cu^{2+}$ and $Hg^{2+}$ at CISPE was studied by differential pulse anodic stripping voltammetry (DPASV). Compared with carbon paste electrode, the stripping peak currents had a significant increase at CISPE. Under the optimized conditions, the detection limits were $8.0{\times}10^{-8}\;M$ ($Cd^{2+}$), $4.0{\times}10^{-8}\;M$ ($Pb^{2+}$), $6.0{\times}10^{-8}\;M$ ($Cu^{2+}$), $1.0{\times}10^{-8}\;M$ ($Hg^{2+}$), respectively. Furthermore, the present method was applied to the determination of $Cd^{2+}$, $Pb^{2+}$, $Cu^{2+}$ and $Hg^{2+}$ in water samples and people hair sample.
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Water film covering characteristic on horizontal fuel rod under impinging cooling condition
Zhang Penghui,Wang Bowei,Chen Ronghua,Su G.H.,Tian Wenxi,Qiu Suizheng 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Jet impinging device is designed for decay heat removal on horizontal fuel rods in a low temperature heating reactor. An experimental system with a fuel rod simulator is established and experiments are performed to evaluate water film covering capacity, within 0.0287e0.0444 kg/ms mass flow rate, 0 e164.1 kW/m2 heating flux and 13.8e91.4C feeding water temperature. An effective method to obtain the film coverage rate by infrared equipment is proposed. Water film flowing patterns are recoded and the film coverage rates at different circumference angles are measured. It is found the film coverage rate decreases with heating flux during single-phase convection, while increases after onset of nucleate boiling. Besides, film coverage rate is found affected by Marangoni effect and film accelerating effect, and surface wetting is significantly facilitated by bubble behavior. Based on the observed phenomenon and physical mechanism, dry-out depth and initial dry-out rate are proposed to evaluate film covering potential on a heating surface. A model to predict film coverage rate is proposed based on the data. The findings would have reliable guide and important implications for further evaluation and design of decay heat removal system of new reactors, and could be helpful for passive containment cooling research.
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Penghui Zhang,Sheying Dong,Guangzhe Gu,Tinglin Huang 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
Ionic liquid-functionalized ordered mesoporous silica SBA-15 modified carbon paste electrode (CISPE) was fabricated and its electrochemical performance was investigated by cyclic voltammetry, electrochemical impedance spectra. The electrochemical behavior of Cd2+, Pb2+, Cu2+ and Hg2+ at CISPE was studied by differential pulse anodic stripping voltammetry (DPASV). Compared with carbon paste electrode, the stripping peak currents had a significant increase at CISPE. Under the optimized conditions, the detection limits were 8.0 × 10‒8 M (Cd2+), 4.0 × 10‒8 M (Pb2+), 6.0 ×10‒8 M (Cu2+), 1.0 × 10‒8 M (Hg2+), respectively. Furthermore, the present method was applied to the determination of Cd2+, Pb2+, Cu2+ and Hg2+ in water samples and people hair sample.
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Interleaved High Step-Up Boost Converter
Penghui Ma,Wenjuan Liang,Hao Chen,Yubo Zhang,Xuefeng Hu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
Renewable energy based on photovoltaic systems is beginning to play an important role to supply power to remote areas all over the world. Owing to the lower output voltage of photovoltaic arrays, high gain DC-DC converters with a high efficiency are required in practice. This paper presents a novel interleaved DC-DC boost converter with a high voltage gain, where the input terminal is interlaced in parallel and the output terminal is staggered in series (IPOSB). The IPOSB configuration can reduce input current ripples because two inductors are interlaced in parallel. The double output capacitors are charged in staggered parallel and discharged in series for the load. Therefore, IPOSB can attain a high step-up conversion and a lower output voltage ripple. In addtion, the output voltage can be automatically divided by two capacitors, without the need for extra sharing control methods. At the same time, the voltage stress of the power devices is lowered. The inrush current problem of capacitors is restrained by the inductor when compared with high gain converters with a switching-capacitor structure. The working principle and steady-state characteristics of the converter are analyzed in detail. The correctness of the theoretical analysis is verified by experimental results.
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Development of Virtual Production Camera Control System based on Arduino
LI PENGHUI,김기홍,이준석,후정동,Zhang Gaohe 사단법인 한국융합기술연구학회 2023 아시아태평양융합연구교류논문지 Vol.9 No.2
Virtual production technology is becoming more mature and is widely used in the production of video content such as movies, drama series, and advertisements. In the two solutions of virtual production (Live LED Wall Cinematography and Live Compositing), the virtual camera and the real camera are required to be identical, that is, after the synchronization of the intrinsic hardware parameters of the real camera and the virtual camera, the exposure parameters of the real camera are changed during shooting, the corresponding parameters of the virtual camera must also be changed to ensure the consistency of the picture. At present, most virtual production studios use camera control systems that are transformed from broadcast camera consoles usually require cumbersome accessories and high prices. During the actual production process, a camera control system using the Arduino development board is found, which inherits the characteristics of easy-to-operate and strong adaptability of the Arduino development board. The serial digital interface camera control protocol provided by Blackmagic Design (BMD SDI CCP), allows the virtual camera (CineCamera) in the virtual production engine Unreal Engine 5 (UE5) and the real camera to communicate in real-time through the use of serial communication. This paper uses literature analysis to explore the necessity and functional requirements of virtual production camera control systems and the feasibility of the virtual production camera system proposed in this study through analysis of academic journals, industry white papers, professional practitioners, and organization presentations. Descript the hardware requirement and design code for the camera control system, verify the feasibility of the system through empirical research, and provide a camera control system that can be customized for individuals or teams who want to make video content through virtual production.
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Interleaved High Step-Up Boost Converter
Ma, Penghui,Liang, Wenjuan,Chen, Hao,Zhang, Yubo,Hu, Xuefeng The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
Renewable energy based on photovoltaic systems is beginning to play an important role to supply power to remote areas all over the world. Owing to the lower output voltage of photovoltaic arrays, high gain DC-DC converters with a high efficiency are required in practice. This paper presents a novel interleaved DC-DC boost converter with a high voltage gain, where the input terminal is interlaced in parallel and the output terminal is staggered in series (IPOSB). The IPOSB configuration can reduce input current ripples because two inductors are interlaced in parallel. The double output capacitors are charged in staggered parallel and discharged in series for the load. Therefore, IPOSB can attain a high step-up conversion and a lower output voltage ripple. In addtion, the output voltage can be automatically divided by two capacitors, without the need for extra sharing control methods. At the same time, the voltage stress of the power devices is lowered. The inrush current problem of capacitors is restrained by the inductor when compared with high gain converters with a switching-capacitor structure. The working principle and steady-state characteristics of the converter are analyzed in detail. The correctness of the theoretical analysis is verified by experimental results.
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Yaqiang Li,Penghui Ren,Yuanhang Zhang,Shengxu Wang,Jinqiu Zhang,Peixia Yang,Anmin Liu,Guangzhao Wang,Zhidong Chen,Maozhong An 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Finding proper additive to achieve copper superconformal electrodeposition is significantly important. Brilliant Green exhibits excellent suppressing ability to the copper electrodeposition according to electrochemicalanalysis. Meanwhile, 100 mg/L was selected as the optimum value based on the convectiondependentadsorption behavior analysis of Brilliant Green. The interaction among three different additiveswas also investigated by applying chronopotentiometry as well as Brilliant Green compete to absorbon the cathode surface with SPS. Besides, the introduction of Brilliant Green can improve the transport ofcupric ions (Cu2+). The nucleation and growth of copper deposition is 3D diffusion-controlled instantaneousgrowth process at high overpotential but 3D diffusion-controlled mixing growth process at lowoverpotential. The synergistic suppressing mechanism was proposed to explain strong suppressing effectof BG on reduction of Cu2+ and the reaction pathways was studied theoretically. Copper interconnectlayer with high FP values (80.52 % to 84.38 %) was obtained with low SDT (about 28 lm) after electroplatingprocess was optimized. The surface morphology under the influence of Brilliant Green is compactand uniform and the grain size is reduced by Brilliant Green.
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Pengwen Sun,Jie Zhang,Penghui Wu,Jiandong Li,Lanting Zhang,Weifei Hu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
A discrete material optimization method with a patch strategy based on the stiffness matrix interpolation is proposed, and a comprehensive technical process of patch discrete material optimization using existing finite element software was developed. This method employs the stiffness matrix instead of the constitutive matrix for material interpolation, which facilitates the optimization process integrated with the existing finite element software. The element stiffness matrix can be derived directly from the finite element analysis, which can not only ensure the correctness of the data, but also reduce the programming work of solving the numerical integration of the composite constitutive matrix. The mathematical model of the patch discrete material optimization is established, which takes the artificial density as the design variable, the minimum compliance as the objective function, and the sequential quadratic programming (SQP) algorithm as the optimization solver. Numerical examples show that by seeking a balance between the number of regions and practical production, the performance of the composite could be further improved using the discrete material optimization method with a patch strategy. Besides, the convergence rate of the optimization is increased by introducing the sum constraints of the design variables and the value functions. The effectiveness and the feasibility of the method were verified.
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