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Catalytic reduction of NO_x by biomass-derived activated carbon supported metals

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2077-2083页

作者： Yun Shu fan Zhang fan Wang Hongmei Wang Research Center of Air Pollution Control Technology Chinese Research Academy of Environmental Sciences

In this study,to prepare a series of activated carbon-supported metals for the catalytic reduction of NO_x to N_2 in excess O_2,activated carbons derived from lignocellulosic and herbaceous biomasses were selected as the reducing agents,and alkali and transition metals were used as the catalytic active *** effects of the type of biomass,carbonization temperature and catalyst composition on NO_x reduction efficiency were analyzed in a fixed-bed flow *** results showed that two temperature regimes are present for the NO_x-carbon reaction:at temperatures below 250°C,the NO_x adsorption process on the carbon surface was predominant,whereas true NO_x reduction by carbon occurred at temperatures above 250°C,producing N_2,CO_2 and *** influence of the carbonization temperature on carbon reactivity depended on the effect of the carbonization temperature on the carbon surface area and the reduction of the metal species on *** studied metals catalyzed both NO_xand O_2reduction by carbon,and potassium could strongly enhance the C-NO_x reaction without substantial carbon consumption by O_***,the potassium supported by sawdust-derived activated carbon exhibited higher selectivity and capacity towards NO_x reduction than did its previously reported coal-derived *** properties were ascribed to the high dispersion of the active potassium species on the carbon surface,as observed through the comparison of X-ray photoelectron spectroscopy and powder X-ray diffraction results for the carbons made from biomass and coal-based precursors.

关键词： Biomass NOx reduction Activated carbon Selectivity

Calculation method of ship collision force on bridge using artificial neural network

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 614-623页

作者： Wei fan Wan-cheng YUAN Qi-wu fan State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Department of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Ship collision on bridge is a dynamic process featured by high nonlinearity and instantaneity. Calculating ship-bridge collision force typically involves either the use of design-specification-stipulated equivalent static load, or the use of finite element method (FEM) which is more time-consuming and requires supercomputing resources. In this paper, we proposed an alternative approach that combines FEM with artificial neural network (ANN). The radial basis function neural network (RBFNN) employed for calculating the impact force in consideration of ship-bridge collision mechanics. With ship velocity and mass as the input vectors and ship collision force as the output vector, the neural networks for different network parameters are trained by the learning samples obtained from finite element simulation results. The error analyses of the learning and testing samples show that the proposed RBFNN is accurate enough to calculate ship-bridge collision force. The input-output relationship obtained by the RBFNN is essentially consistent with the typical empirical formulae. Finally, a special toolbox is developed for calculation efficiency in application using MATLAB software.

关键词： Ship-bridge collision force Finite element method (FEM) Artificial neural network (ANN) Radial basis function neural network (RBFNN)

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灾害态势感知:研究进展与未来展望

灾害学 2025年第1期40卷 117-122页

作者：侯俊东唐范郭海湘中国地质大学(武汉)经济管理学院湖北武汉430074 中国地质大学(武汉)自然灾害风险防控与应急管理实验室湖北武汉430074

灾害态势感知是灾害高效应对的基础和前提,是推动灾害预防关口前移、重心下移的关键环节。该文遵循“理论-方法-应用”逻辑框架,系统梳理灾害态势感知的概念内涵和模型结构,总结灾害态势要素提取与融合、态势评估与预测方法的进展,并解... 详细信息

灾害态势感知是灾害高效应对的基础和前提,是推动灾害预防关口前移、重心下移的关键环节。该文遵循“理论-方法-应用”逻辑框架,系统梳理灾害态势感知的概念内涵和模型结构,总结灾害态势要素提取与融合、态势评估与预测方法的进展,并解读灾害态势感知理论方法的实践应用。研究发现,该领域还存在研究场景多集中单一灾害或特定情景、理论研究偏重个体认知层面、方法研究侧重数据提取与融合、应用研究过多关注特定问题的解决等不足。未来研究应着重发展灾害态势感知的人机物协同理论体系、全息技术方法体系和面向应急决策的应用体系,以进一步提升和丰富灾害态势感知研究理论创新和知识体系。

关键词：灾害态势感知态势要素理论-方法-应用

Ce and Se co-doped MBG/SA/HLC microgel bone powder for repairing tumor bone defects

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Nano Research 2023年第1期16卷 746-756页

作者： Miaolin fan Wan Liu Cuiying fan Xiaoyan Zheng Junfeng Hui Chaoquan Hu Daidi fan Shaanxi Key Laboratory of Degradable Biomedical Materials Shaanxi R&D Center of Biomaterials and Fermentation EngineeringSchool of Chemical EngineeringNorthwest UniversityXi’an 710069China Biotech.&Biomed.Research Institute Northwest UniversityXi’an 710069China Xi’an Giant Biogene Technology Co. Ltd.Xi’an 710069China Nanjing IPE Institute of Green Manufacturing Industry Nanjing 211100China

The repair and treatment of tumor bone defects is a difficult problem to solve urgently in clinical *** tumor resection,patients are not only faced with a large area of bone defect,but also may have the risk of tumor recurrence,which can easily cause huge physical and mental harm to *** this study,we successfully designed and constructed an organic/inorganic composite microgel bone powder(S-H-M3%Ce/3%Se)based on cerium(Ce)and selenium(Se)elements co-doped mesoporous bioactive glass(M3%Ce/3%Se),sodium alginate(SA),and recombinant human-like collagen(HLC).The obtained S-H-M3%Ce/3%Se could inhibit the growth of osteoma cells and promote the growth of normal cells,and effectively promote the repair of defect *** integration of the“treatment and repair”organic/inorganic composite microgel bone powder provided a new strategy for the treatment of cancerous bone defects.

关键词： mesoporous bioactive glass functional elements osteoma inhibition bone repair

Effect of swirling flow on platelet concentration distribution in small-caliber artificial grafts and end-to-end anastomoses

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Acta Mechanica Sinica 2011年第5期27卷 833-839页

作者： fan Zhan Yu-Bo fan Xiao-Yan Deng Key Laboratory for Biomechanics and Mechanobiologyof Ministry of Education School of Biological Science and Medical EngineeringBeihang University 100191 Beijing China

Platelet concentration near the blood vessel wall is one of the major factors in the adhesion of platelets to the *** our previous studies,it was found that swirling flows could suppress platelet adhesion in small-caliber artificial grafts and end-to-end *** order to better understand the beneficial effect of the swirling flow,we numerically analyzed the near-wall concentration distribution of platelets in a straight tube and a sudden tubular expansion tube under both swirling flow and normal flow *** numerical models were created based on our previous experimental *** simulation results revealed that when compared with the normal flow,the swirling flow could significantly reduce the near-wall concentration of platelets in both the straight tube and the expansion *** present numerical study therefore indicates that the reduction in platelet adhesion under swirling flow conditions in small-caliber arterial grafts,or in end-to-end anastomoses as observed in our previous experimental study,was possibly through a mechanism of platelet transport,in which the swirling flow reduced the near-wall concentration of platelets.

关键词： Platelet near-wall concentration · Swirling flow · Small-caliber arterial grafts · End-to-end anastomosis

Bounded Tiles in ■_p are Compact Open Sets

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Acta Mathematica Sinica,English Series 2020年第2期36卷 189-195页

作者： Ai Hua fan Shi Lei fan LA MFA UMR 7352 CNRSUniversity of Picardie33 rue Saint Leu80039 AmiensFrance School of Mathematics and Statistics&Hubei Key Laboratory of Mathematical Sciences Central China Normal UniversityWuhan430079P.R.China

Any bounded tile of the field Qp of p-adic numbers is a compact open set up to a set of zero Haar *** this note,we present two simple and direct proofs of this fact.

关键词： p-adic field tile bounded compact open

Normal Contact Model for Elastic and Plastic Mechanics of Rough Surfaces

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Acta Mechanica Solida Sinica 2019年第2期32卷 148-159页

作者： Dong Wang Zhousuo Zhang fan Jin Xuanhua fan State Key Laboratory for Manufacturing and Systems Engineering School of Mechanical Engineering XVan Jiaotong University Xi'an 710049 China Institute of Systems Engineering China Academy of Engineering Physics Mianyang 621999 China

An elastic and plastic mechanical model is proposed to characterize the normal contact of rough surfaces. The contact process is considered as three separated contact regimes, i.e., the fully elastic, mixed elastic一plastic and fully plastic ones. The Hertzian elastic contact solutions and the classical fully plastic contact model of Abbott and Fires tone are used to model the contact behaviors of fully elastically deformed asperities and fully plastically deformed ones, respectively. For the mixed elastic-plastic regime, an improved Hermit interpolation method is applied to enforce the continuity and smoothness at the critical contact interference, and to decrease the interpolation waving effect by transforming the physical quantities of contact load into logarithmic coordinates. The contac t model of rough surfaces is formula ted by using the Greenwood and Williamson^ statistics analysis. Comparisons with the CEB, ZMC and KE models are then performed to examine the effects of plasticity index and mean separation. Agreeing well with the ZMC model, our results show that the total contact load of rough surfaces decreases with the increase in mean separation, and the difference between the prediction results of elastic models and the plastic ones also decreases, indicating that the contact behaviors mainly dominated by plastically deformed asperities have been changed to be controlled by elastically deformed ones. Larger plasticity index represents more plastically deformed asperities, inducing normal contact behaviors mainly dominated by plastic solutions.

关键词： Rough surfaces Elastic plastic Asperity contact Logarithm transformation Statistics analysis

Angular Momentum-Phase Coherent State for an Electron in Uniform Magnetic Field

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Chinese Physics Letters 2001年第3期18卷 319-321页

作者： fan Hong-Yi fan Yue Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026

Based on the newly constructed state|l,r>>[fan et al.,***.16(1999)706],where l is the angular mometum quantum number and r denotes the electron's orbit radius in a uniform magnetic field,we propose a new angular momentum-phase coherent state by introducing a new operator A.A and A^(†)are annihilation and creation operator in the|l,r>>space,*** coherent state is A's eigenket and possesses non-orthonormal and overcomplete properties,it is constructed on the certain superposition of zero-angular momentum states along the radius direction.

关键词： radius angular momentum

Influence of Wall Effect on Comprehensive Controllability for Ducted fan Aircraft

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Journal of Beijing Institute of Technology 2020年第4期29卷 581-591页

作者： Tianfu Ai Changle Xiang Bin Xu Wei fan Yibo Zhang Vehicle Research Center School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

A novel coaxial ducted fan structure aircraft is proposed to enable the aircraft near vertical walls at high *** state space equation of the system can be obtained by correlation deduction and identification of the whole prototype *** on the duct test bench experiment and computational fluid dynamics(CFD)simulation analysis,the expressions between the different distances dWE from the rotor center of the prototype to the wall and the thrust,reaction torque,and tilting moment of the system under hovering conditions are *** influence of the wall effect of the prototype is incorporated into the system model to analyze the relationship between distance dWE and the comprehensive controllability of the *** results show that the system comprehensive controllability vector of other channels changes little with the decrease of the distance dWE,and only the controllability vector of the rolling channel increases *** the same time,the tilting moment also increases significantly,which strengthens the tendency of the prototype to tilt towards the wall.

关键词： coaxial ducted fan aircraft hovering condition wall effect tilting moment comprehensive controllability analysis