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基于变形控制的某深埋软岩水工隧洞初期支护参数的选择与验证

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水力发电 2024年第2期50卷 24-29页

作者：裴江荣刘立鹏汪小刚中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100038

大变形下围岩的稳定控制一直是水利水电、公路、铁路等行业的传统难题,尚未形成一套验证软岩大变形等级下初期支护型式及参数选取的经验方法。依据某深埋水工隧洞工程地质情况,选择典型洞段预测挤压变形风险,利用控制变形估算所需支护力... 详细信息

大变形下围岩的稳定控制一直是水利水电、公路、铁路等行业的传统难题,尚未形成一套验证软岩大变形等级下初期支护型式及参数选取的经验方法。依据某深埋水工隧洞工程地质情况,选择典型洞段预测挤压变形风险,利用控制变形估算所需支护力,依据规范和相关工程经验确定支护类型与参数的同时,考虑实际开挖过程利用数值仿真分析验算支护的合理性。结果表明,该隧洞具有极大的大变形风险,采用支护力的方法所确定的支护类型和参数基本合理,可将围岩变形有效控制在规范要求的1.0%~3.0%范围,且锚杆长度及支护应力等均未超过极限强度。

关键词：软岩水工隧洞大变形变形控制支护力支护参数选择验证数值模拟

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Electrochemical characterization of ion selectivity in electrodeposited nickel hexacyanoferrate thin films

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Journal of University of Science and Technology Beijing 2008年第1期15卷 79-83页

作者： Jinxia Guo xiaogang Hao Xuli Ma Zhonglin Zhang Shibin liu Department of Chemical Engineering Talyuan University of Technology Talyuan 030024 China

The ion selectivity of electrodeposited nickel hexacyanoferrate （NiHCF） thin films was investigated using electrochemical impedance spectroscopy （EIS） and cyclic voltammetry （CV）. NiHCF thin films were prepared by cathodic deposition on Pt and Al substrates. EIS and CV curves were determined in 1 mol/L （KNO3＋C5NO3） and 1 mol/L （NaNO3＋CsNO3） mixture solutions, which were sensitive to the concentration of Cs^＋ in the electrolytes. Experimental results show that all Nyquist impedance plots show depressed semicircles in the high-frequency range changing over into straight lines at lower frequencies. With increasing amounts of Cs^＋, the redox potentials in CV curves shift toward more positive values and the redox peaks broaden; the semicircle radius in corresponding EIS curves and the charge transfer resistance also increase. EIS combining CV is able to provide valuable insights into the ion selectivity of NiHCF thin films. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： NiHCF thin films ion selectivity electrochemical deposition cyclic voltammetry electrochemical impedance spectra

Three-dimensional fuzzy logic system for process modeling and control

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控制理论与应用（英文版） 2010年第3期8卷 280-285页

作者： Han-Xiong LI xiaogang DUAN Zhi liu Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Hong Kong China School of Mechanical and Electrical Engineering Central South University Changsha Hunan 410083 China School of Automation Guangdong University of Technology Guangzhou Guangdong 510006 China

The traditional fuzzy logic system （FLS） can only model and control the process in two-dimensional nature. Many of real-world systems are of multidimensional features, such as, thermal and fluid processes with spatiotemporal dynamics, biological systems, or decision-making processes that contain stochastic and imprecise uncertainties. These types of systems are difficult for the traditional FLS to model and control because they require a third dimension for spatial or probabilistic information. The type-2 fuzzy set provides the possibility to develop a three-dimensional fuzzy logic system for modeling and controlling these processes in three-dimensional nature.

关键词： Three-dimensional fuzzy logic system Spatiotemporal system Modeling

Fuzzy Sliding Mode Active Disturbance Rejection Control of an Autonomous Underwater Vehicle-Manipulator System

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Journal of Ocean University of China 2020年第5期19卷 1081-1093页

作者： ANG Hongdu LI xiaogang liu Xin KARKOUB Mansour ZHOU Liqin College of Engineering Ocean University of ChinaShandong Engineering Research Center of Marine Intelligent Equipment and InstrumentsQingdao 266100China Department of Investigation Sichuan Police CollegeLuzhou 646000China Mechanical Engineering Texas A&M University at QatarDoha 23874Qatar

In this paper, a fuzzy sliding mode active disturbance rejection control(FSMADRC) scheme is proposed for an autonomous underwater vehicle-manipulator system(AUVMS) with a two-link and three-joint manipulator. First, the AUVMS is separated into nine subsystems, and the combined effects of dynamic uncertainties, hydrodynamic force, unknown disturbances, and nonlinear coupling terms on each subsystem are lumped into a single total disturbance. Next, a linear extended state observer(LESO) is presented to estimate the total disturbance. Then, a sliding mode active disturbance rejection control(SMADRC) scheme is proposed to enhance the robustness of the control system. The stability of the SMADRC and the estimation errors of the LESO are analyzed. Because it is difficult to simultaneously adjust several parameters for a LESO-based SMADRC scheme, a fuzzy logic control(FLC) scheme is used to formulate the FSMADRC to determine the appropriate parameters adaptively for practical applications. Finally, two AUVMS tasks are illustrated to test the trajectory tracking performance of the closed-loop system and its ability to reject and attenuate the total disturbance. The simulation results show that the proposed FSMADRC scheme achieves better performance and consume less energy than conventional PID and FLC techniques.

关键词： Fuzzy sliding mode active disturbance rejection controller(FSMADRC) linear extended state observer(LESO) auto-nomous underwater vehicle-manipulator system(AUVMS) total disturbance fuzzy logic control

Study on the Accumulation of Heavy Metals in Varieties of Agaricus bisporus

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Meteorological and Environmental Research 2018年第4期9卷 116-120页

作者： Zhou Lin Guo Shang shu mia.liu xiaogang Guo Xiaofei Wang Hua Nan Xiaojie Institute of Edible Fungi Shanxi Academy of Agricultural Sciences Taiyuan 030031 China Shea Labagh Dobberstain San Francisco CA 94111 USA College of Horticulture Shanxi Agricultural University Taigu 030801 China

The accumulation characteristics and resistance to heavy metal pollution of six varieties of Agar/cus b/spoms were studied. The results showed that arsenic, mercury and cadmium content could be detected in the six varieties, and all of the varieties were contaminated by heavy metals ,but they did not exceed the limits in the national standards for food safety. These varieties had a low quality risk and can be eaten safely. Varie-ties 1 and 6 were strongly resistant to the three kinds of heavy metals, while variety 4 was weakly resistant to heavy metal pollution.

关键词： Agaricus bisporus Heavy metals Accumulation characteristics Heavy metal pollution Varieties resistant to pollution

Liftoff of a New Hovering Oscillating-wing Micro Aerial Vehicle

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Journal of Bionic Engineering 2021年第3期18卷 649-661页

作者： Xiangcong Zhou Deyuan Zhang Zhiyong Huang xiaogang Song Hao liu Lin Feng Institute of Bionic and Micro-Nano Systems School of Mechanical Engineering and AutomationBeihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China Graduate School of Engineerings Chiba University Chiba 263-8522Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Center Shanghai 200240China

Hovering ability forms the basis for space operations of Micro Aerial Vehicles(MAVs).The problem of uneven load puts high demands on the wing *** this paper,a new hovering-mode for MAVs,inspired by flapping flight in bees and hummingbirds but using high-aspect-ratio and low-stress wings,is *** from the flapping actuations that occur at the wing roots,the two wings are driven back and forth in a straight *** simplify the design and control the angle of attack,passive wing rotation is *** numerical results and analysis show that the maximum stress of the oscillating wing is approximately 1/6 of that of the flapping wing when the lift of the oscillating wing is twice that of the flapping wing.A theoretical aerodynamic model of the kinematics of the vehicle's driving mechanism was developed to fulfill its *** measurements indicate that the vehicle generates a sufficiently high cycle-averaged vertical thrust(71 g)for liftoff at a maximum frequency of 5.56 Hz,thereby validating the proposed aerodynamic ***,liftoff performance is presented to visually demonstrate the vertical take-off capabilities and hovering potential of the aeromechanical solution.

关键词： bioinspired oscillating-wing high aspect ratio low-stress wings micro aerial vehicles vertical take-off and hovering

Photocatalytic Degradation of Rhodamine B by Recyclable Ag Br/Polypyrrole(PPy)Nano-Catalysts

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1198-1204页

作者： YIN xiaogang liu Xinyun LI Hang WU Huimin FU Hai GONG Wei Key Laboratory of Functional Materials Chemistry of Gui Zhou Province School of Chemistry and Materials ScienceGui Zhou Normal UniversityGuiyang 550001China School of Pharmaceutical Sciences Guizhou Medical UniversityGuiyang 550025China

We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)*** PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAB)as both the soft-templating agent and the bromine source,a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis *** synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and AgBr led to increased thermal *** combination of PPy and AgBr was observed through XRD and XPS *** the morphology study,the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM *** the photodegradation experiments,up to 92%rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV *** catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test.

关键词： polypyrrole AgBr photocatalysts rhodamine B

Specific generation of nitric oxide in mitochondria of cancer cell for selective oncotherapy

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Nano Research 2022年第6期15卷 5273-5278页

作者： Mengyu Sun Yanjuan Sang Qingqing Deng Zhengwei liu Jinsong Ren xiaogang Qu Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100039China

Nitric oxide(NO)gas therapy,especially,L-arginine(L-Arg)-based NO treatment strategies have attracted extensive attention in the field of ***,current strategies are unable to differentiate well between normal cells and cancer cells,which may lead to unpredictable *** by the fact that mitochondria of cancer cells can express excessive nitric oxide synthetase(NOS),herein,a nanozyme-based NO generator,cerium oxide(CeO_(2))-AT,is fabricated to specifically catalyze the production of NO in cancer cells for selective tumor *** this system,after being endocytosed into cancer cells,the generator can produce a number of NO under the catalysis of NOS in mitochondria of cancer cells,which can disrupt the mitochondrial respiratory chain of tumor cells and further induce cell *** addition,the generator with catalase(CAT)-like activity can catalyze H_(2)O_(2)to produce O_(2),which can promote the generation of NO and improve the performance of NO gas *** is more,our system has no obvious impact on the viability of normal cells owing to the less production of *** work paves a new way for the development of highly selective NO-based treatment particularly useful for the safe and specific cancer therapy.

关键词： nitric oxide nitric oxide synthetase nanozyme mitochondria specific cancer therapy

Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

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Chinese Journal of Chemical Engineering 2022年第2期35卷 364-379页

作者： Xiaoyi Chen Danyang Song Dong Zhang xiaogang Jin Xiang Ling Dongren liu School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China School of Mechanical Engineering Shanghai Institute of TechnologyShanghai 201418China Mechanical Engineering College Yangzhou UniversityYangzhou 225009China

According to environmental and energy issues,renewable energy has been vigorously *** solar power is widely used in many areas but it is limited by the weather conditions and cannot work *** storage is a considerable solution for this problem and thermochemical energy storage is the most promising way because of its great energy density and ***,this technology is not mature enough to be applied to the *** reactor is an important component in the thermochemical energy storage system where the charging and discharging process *** this paper,a spiral coil is proposed and used as a reactor in the thermochemical energy storage *** advantages of the spiral coil include simple structure,small volume,and so *** investigate the flow characteristics,the simulation was carried out based on energy-minimization multi-scale model(EMMS)and Eulerian two-phase ***_(3) particles were chosen as the *** distribution was shown in the *** gas initial velocity was set to 2 m·s^(-1),3 m·s^(-1),and 4 m·s^(-1).When the particles flowed in the coil,gravity,centrifugal force and drag force influenced their *** the Reynold numbers increasing,centrifugal and drag force got *** phenomenon existed in the coil and results showed with the gas velocity increasing,accumulation moved from the bottom to the outer wall of the ***,the accumulation phenomenon was stabilized whenφ>720°.Also due to the centrifugal force,a secondary flow formed,which means solid particles moved from the inside wall to the outside *** secondary flow could promote turbulence and mixing of particles and *** addition,when the particle volume fraction is reduced from 0.2 to 0.1,the accumulation at the bottom of the coil decreases,and the unevenness of the velocity distribution becomes larger.

关键词： Thermochemical energy storage CaCO3/CaO Reactors Simulation Two-phase flow Energy-minimization multi-scale model(EMMS)