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Graphene-based silicon modulators

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Frontiers of Information Technology & Electronic Engineering 2019年第4期20卷 458-471页

作者： Hao-wen SHU Ming JIN yuan-sheng tao Xing-jun WANG State Key Laboratory on Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer Science Peking University Nano-optoelectronics Frontier Center of Ministry of Education at Peking University

Silicon photonics is a promising technology to address the demand for dense and integrated nextgeneration optical interconnections due to its complementary-metal-oxide-semiconductor(CMOS) ***, one of the key building blocks, the silicon modulator, suffers from several drawbacks, including a limited bandwidth, a relatively large footprint, and high power consumption. The graphene-based silicon modulator, which benefits from the excellent optical properties of the two-dimensional graphene material with its unique band structure,has significantly advanced the above critical figures of merit. In this work, we review the state-of-the-art graphenebased silicon modulators operating in various mechanisms, i.e., thermal-optical, electro-optical, and plasmonic. It is shown that graphene-based silicon modulators possess the potential to have satisfactory characteristics in intra-and inter-chip connections.

关键词： Silicon photonics Graphene Optical modulator

Effect of nano-SiC particles on the corrosion resistance of NiP-SiC composite coatings

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 444-451页

作者： Xue-tao yuan Dong-bai Sun Hong-ying Yu Yu Wang School of Materials Science and Technology University of Science and Technology Beijing Beijing 100083 China Beijing Engineering-Research Center for Surface Nano-Technology Beijing 100083 China

NiP-SiC （≈1 1wt% P） composite coatings were electroplated in a Brenner type plating bath. The coatings had amorphous nano-phase composite structure. Direct current and alternating current electrochemical tests were carried out on such coatings in a 3.5wt% solution of NaCl to evaluate their corrosion resistance. The potentiodynamic polarization, electrochemical impedance spectroscopy （EIS） tests, and exposure experiments all show that the corrosion resistance of NiP-SiC coatings first increases and then decreases when the SiC content increases, but the corrosion resistance of NiP-SiC composite coating is better than that of amorphous NiP coatings.

关键词： electroplating composite coating nanoparticle corrosion resistance electrochemical impedance spectroscopy

A fault tolerant closed-loop anesthesia system based on internal model control and extended state observer

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A fault tolerant closed-loop anesthesia system based on inte...

Linear Acceleration of an Undulatory Robotic Fish with Dynamic Morphing Median Fin under the Instantaneous Self-propelled Condition

第25届中国控制与决策会议

作者： yuan tao Mengqi Fang Youqing Wang College of Information Science and Technology Beijing University of Chemical Technology

ISBN: (纸本)9781467355339

This paper proposes a fault tolerant strategy for a closed-loop anesthesia system. To the authors best knowledge, it is the first time that the concept of fault tolerance applied to intravenous anesthesia. Internal model control （IMC） is used to construct the basic closed-loop system, and bispectral index （BIS） is selected as a measurement of patients depth of anesthesia （DoA） as well as a feedback signal. In this study, a sensor fault, BIS artifact, is considered. An extended state observer （ESO） and a switching strategy are selected for fault detection and control reconfiguration. All of the above mentioned works are established on a closed-loop aesthesia simulation platform. Simulation results demonstrate that the proposed scheme can deal with the considered kind of fault effectively.

关键词： Closed-loop Aesthesia Fault Tolerant Control Internal Model Control Extended State Observer

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Journal of Bionic Engineering 2020年第2期17卷 241-253页

作者： Wenguang Sun Zemin Liu Ziyu Ren Gang Wang tao yuan Li Wen School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China

Fish commonly execute rapid linear accelerations initiated during steady swimming,yet the function of the median fins during this process is less *** find that the erection/folding time(from the starting time of the linear acceleration(0 s)to the starting time of the folding movement of the fin),as well as the spreading area of the median fins,actively change during the linearacceleration of the live largemouth bass(Micropterus salmoides).To better understand the influence of the folding time and the area change of the median fins on the linear acceleration,we implemented an undulatory biomimetic robotic fish with soft median fins that can be programmed to erect and fold,just like a live *** characterize the acceleration performance of the robotic fish,we developed a"self-propelled"experiment technique based on the Kalman filter and Proportional-Integral-Derivative(PID)control *** experiments on the robotic fish show the acceleration induced by fully-erected median fins increases by 46.3%.Fully-erected median fins positively contribute to propulsion primarily at the onset stage of the linear acceleration while result in a significant decrease in steady swimming speed by 25%,which suggests a large drag force is induced at the steady swimming stage due to the enlarged wetted *** sweeping experiments on erection/folding time and spreading area demonstrate a proper combination of the erection/folding time and the spreading area enhances the mean linear acceleration by up to 85%.Particle Image Velocimetry(PIV)results reveal that the vortexes shed by the erected dorsal fin are stronger than those shed by the folded *** the acceleration process progresses,the thrust generated by the dorsal fins gradually is weakened until only resistance is generated in the *** findings may shed light on the realization of controllable surfaces on high performance fish-inspired robotic systems in the future.

关键词： robotic fish linear acceleration median fin instantaneous self-propelled system

Enhancement of Soil Discharge Channels on Potential Surrounding Buried Cables Under Impulsive Currents

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1794-1803页

作者： Wenxia Sima Xiaochuan Li tao yuan Ming Yang Donghui Luo Jialun Li State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing400044China State Grid Sichuan Electric Power Research Institute ChengduSichuan610041China

Substations have a large number of signal transmission cables beneath the *** the insulation safety and signal reliability of the cables are affected severely by the electromagnetic *** high-amplitude impulsive currents,the dispersion of currents can cause soil discharge and thus cause unexpected distortions in an electromagnetic *** paper focuses on the distortions of the electric *** general,soil discharge channels occur in the vicinity of the independent *** development of the channel might enhance the electric field distribution and the potential surrounding the outer insulation of the cables(*** surface potential on the cable).Therefore,this paper establishes a platform for observing the soil discharge channel and measuring the surface *** characteristic of the channel is extracted from the captured image of soil discharge channels and the surface potential is obtained by the measured coupling capacitive current on the shield *** paper also presents an improved model considering a dynamic growing discharge channel for the transient analysis of the grounding *** results show the surface potential increases as the discharge channel approaches the *** quantify this enhancement effect,the ratio of the highest to the lowest value of surface potential in different directions is taken as the multiple of the surface potential *** calculated multiples of the surface potential increase are in the range of 1 to 1.64 times under different conditions by the improved ***,taking the soil discharge channel into account is helpful to accurately analyze the impulsive interference of buried cables.

关键词： Coupling current grounding electrode impulsive current local potential distribution soil discharge channel

A selective reflecting film with a temperature-dependent pitch length

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Chinese Chemical Letters 2010年第3期21卷 279-282页

作者： yuan, Xiao tao Cao, Hui Yang, Zhou Yang, Huai Univ Sci & Technol Beijing Sch Appl Sci Dept Chem Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Dept Mat Phys & Chem Beijing 100083 Peoples R China

A(polymer network/liquid crystal/chiral dopants) composite exhibiting a temperature-sensing switch of infrared spectrum has been *** of the different change of the chiral dopant in the helical twisting power and the anchoring effect of the polymer network,the polymer stabilized liquid crystal(PSLC) films,of which the bandwidth of the selective reflection spectra increased with changing temperature,were obtained.

关键词： Polymer stabilized liquid crystal Thermally induced inversion helical sense Anchoring effect

Progress of Microfluidics for Biology and Medicine

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Nano-Micro Letters 2013年第1期5卷 66-80页

作者： Jingdong Chen Di Chen Yao Xie tao yuan Xiang Chen Science and Technology on Micro/Nano Fabrication Laboratory Research Institute of Micro/Nano Science and TechnologyShanghai Jiao Tong University Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Research Institute of Micro/Nano Science and TechnologyShanghai Jiao Tong University

Microfluidics has been considered as a potential technology to miniaturize the conventional equipments and technologies. It offers advantages in terms of small volume, low cost, short reaction time and highthroughput. The applications in biology and medicine research and related areas are almost the most extensive and profound. With the appropriate scale that matches the scales of cells, microfluidics is well positioned to contribute significantly to cell biology. Cell culture, fusion and apoptosis were successfully performed in microfluidics. Microfluidics provides unique opportunities for rare circulating tumor cells isolation and detection from the blood of patients, which furthers the discovery of cancer stem cell biomarkers and expands the understanding of the biology of metastasis. Nucleic acid amplification in microfluidics has extended to single-molecule, high-throughput and integration treatment in one chip. DNA computer which is based on the computational model of DNA biochemical reaction will come into practice from concept in the future. In addition, microfluidics offers a versatile platform for protein-protein interactions, protein crystallization and high-throughput screening. Although microfluidics is still in its infancy, its great potential has already been demonstrated and will provide novel solutions to the high-throughput applications.

关键词： Microfluidics Lab-on-a-chip Droplet High-throughput Cell Nucleic acid amplification

Analysis of factors influencing the Henry Hub natural gas price based on factor analysis

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Petroleum Science 2017年第4期14卷 822-830页

作者： Hong Li Hui-Ming Zhang yuan-tao Xie Di Wang School of Economics Peking UniversityBeijing 100871People's Republic of China Center for National Resource Economy Studies Beijing 100871People's Republic of China School of Insurance and Economics University of International Business and EconomicsBeijing 100029People's Republic of China

Henry Hub as an important transaction hub for natural gas sets the gas price standard in the USA. In this paper, the factors influencing Henry Hub natural gas prices are analyzed, and the major factors determining the price levels in the period between January 1997 and December 2016 are studied. It is found that economic conditions, total energy demand, US dollar exchange rate and gas consumption are the major factors. The mechanism of each factor influencing the Henry Hub natural gas price is also explored in the paper.

关键词： Natural gas Henry Hub Factor analysis

Thermal hydraulic and mechanical analysis of CH HCSB TBM

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核聚变与等离子体物理 2006年第3期26卷 181-185页

作者： WANG Xiao-yu FENG Kai-ming ZHANG Guo-shu yuan tao Southwestern Institute of Physics Chengdu 610041

Based on the structure design and results of neutronics analysis of the CH HCSB TBM (Chinese helium cooled solid breeder test blanket module), thermal hydraulic and mechanical analyses have been carried out. Results s... 详细信息

关键词：热水力分析中子物理学分析再生区热核反应