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The progress of catalytic technologies in water purification:A review

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Journal of Environmental Sciences 2009年第6期21卷 713-719页

作者： li dapeng QU Jiuhui National Natural Science Foundation of China Beijing 100085 China Research Center for Eeo-Envrionmental Sciences Chinese Academy of Sciences Beijing 100085 China

Catalytic technologies have been paid increasing attention in refractory pollutants abatement due to its practical and potential values in water purification. As effective and efficient approaches for water purification, Fenton＇s reagent, ozonation, electrochemical and photocatalytic methods have been widely studied and applied in different aspects and have been reviewed by several articles. In recent years, some novel catalytic processes based on above processes have been developed for enhancing the efficiency of removing the organics from water. This review emphasized on the recent development of heterogeneous catalytic ozonation, electrocatalysis in respect of novel electrodes and electro-Fenton method, photoelectrocatalysis process and photoelectron-Fenton in water purification. It was also an attempt to propose general ideas about mechanism and principle enhancing the catalytic efficiency for the degradation and the mineralization of organics in water.

关键词： catalytic technology water purification heterogeneous catalytic ozonation electrocatalysis electro-Fenton photoelectro- catalysis photoelectro-Fenton

Analysis on Pseudo Excitation of Random Vibration for Structure of Time Flight Counter

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 325-330页

作者： WU Qiong li dapeng Beijing Engineering Technological Research Center of High-efficient & Green CNC Machining Process and Equipment Beihang University

Traditional computing method is inefficient for getting key dynamical parameters of complicated *** Excitation Method（PEM）is an effective method for calculation of random *** to complicated and coupling random vibration in rocket or shuttle launching,the new staging white noise mathematical model is deduced according to the practical launch *** deduced model is applied for PEM to calculate the specific structure of Time of Flight Counter（ToFC）.The responses of power spectral density and the relevant dynamic characteristic parameters of ToFC are obtained in terms of the flight acceptance test *** stiffness of fixture structure,the random vibration experiments are conducted in three directions to compare with the revised *** experimental results show the structure can bear the random vibration caused by launch without any damage and key dynamical parameters of ToFC are *** revised PEM is similar with random vibration experiment in dynamical parameters and responses are proved by comparative *** maximum error is within 9%.The reasons of errors are analyzed to improve reliability of *** research provides an effective method for solutions of computing dynamical characteristic parameters of complicated structure in the process of rocket or shuttle launching.

关键词： pseudo excitation method power spectral density random processes dynamic response vibration

Hepatitis C virus vaccine development: old challenges and new opportunities

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National Science Review 2015年第3期2卷 285-295页

作者： dapeng li Zhong Huang Jin Zhong Key Laboratory of Molecular Virology and Immunology Institut Pasteur of Shanghai Shanghai Institutes for Biological SciencesChinese Academy of Sciences Institute Pasteur of Shanghai Chinese Academy of Sciences

Hepatitis C virus(HCV), an enveloped positive-sense single-stranded RNA virus, can cause chronic and end-stage liver diseases. Approximately 185 million people worldwide are infected with HCV. Tremendous progress has been achieved in the therapeutics of chronic hepatitis C thanks to the development of direct-acting antiviral agents(DAAs), but the worldwide use of these highly efective DAAs is limited due to their high treatment cost. In addition, drug-resistance mutations remain a potential problem as DAAs are becoming a standard therapy for chronic hepatitis C. Unfortunately, no vaccine is available for preventing new HCV infection. herefore, HCV still imposes a big threat to human public health, and the worldwide eradication of HCV is critically dependent on an efective HCV vaccine. In this review, we summarize recent progresses on HCV vaccine development and present our views on the rationale and strategy to develop an efective HCV vaccine.

关键词： hepatitis C virus vaccine prophylactic vaccine therapeutic vaccine neutralizing antibody

Study on attrition of spherical-shaped Mo/HZSM-5 catalyst for methane dehydro-aromatization in a gas–solid fluidized bed

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Chinese Journal of Chemical Engineering 2021年第10期34卷 172-183页

作者： Xinzhuang Zhang Yunda Han dapeng li Zhanguo Zhang Xiaoxun Ma School of Chemical Engineering Northwest UniversityXi’an 710069China Research Institute of Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an 710065China Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi’an 710069China Shaanxi Research Center of Engineering Technology for Clean Coal Conversion Xi’an 710069China Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi Xi’an 710069China International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources Xi’an 710069China Hydrocarbon High-efficiency Utilization Technology Research Center of Shaanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an 710065China Key Laboratory on Resources Chemicals and Materials Shenyang University of Chemical TechnologyShenyang 110142China Longdong University Qingyang 745000China

As a potential methane efficient conversion process,non-oxidative aromatization of methane in fluidized bed requires a catalyst with good attrition resistance,especially in the states of high temperature,longtime rapid movement and chemical *** evaluation methods for attrition resistance,such as ASTM D5757 and Jet Cup test,are targeted for fresh catalysts at ambient temperature,which cannot well reflect the real *** this study,spherical-shaped Mo/HZSM-5 catalyst prepared by dipping and spray drying was placed in a self-made apparatus for attrition testing,in which the catalyst attrition under different system temperatures,running time and process factors was investigated with percent mass loss(PML),particle size-mass distribution(PSMD)and scanning electron microscope(SEM).Carbon deposition on the catalyst before and after activation,aromatization and regeneration was analyzed by thermogravimetry(TG),and the attrited catalysts were evaluated for methane dehydro-aromatization(MDA).The results show that the surface abrasion and body breakage of catalyst particles occur continuously,with the increase of system temperature and running time,and make the PML rise *** process factors of activation,aromatization and regeneration can cause the catalyst attrition and carbon deposits,which broaden the PSMD in varying degrees,and the carbon-substances on catalysts greatly improve their attrition resistance at high *** attrition has a certain influence on its catalytic performance,and the main reasons point to particle breakage and fine powder escape.

关键词： Attrition Mo/HZSM-5 Fluidized-bed Catalyst activation Methane dehydro-aromatization

Adaptive Neural Network-Based Control for a Class of Nonlinear Pure-Feedback Systems With Time-Varying Full State Constraints

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IEEE/CAA Journal of Automatica Sinica 2018年第5期5卷 923-933页

作者： Tingting Gao Yan-Jun liu Senior Member IEEE Lei liu dapeng li the college of science liaoning university of technologyJinzhou 121000，China ieee the school of electrical engineering liaoning university of technologyJinzhou 121000，China

Abstract--In this paper, an adaptive neural network （NN） control approach is proposed for nonlinear pure-feedback sys- tems with time-varying full state constraints. The pure-feedback systems of this paper are assumed to possess nonlinear function uncertainties. By using the mean value theorem, pure-feedback systems can be transformed into strict feedback forms. For the newly generated systems, NNs are employed to approximate unknown items. Based on the adaptive control scheme and backstepping algorithm, an intelligent controller is designed. At the same time, time-varying Barrier Lyapunov functions （BLFs） with error variables are adopted to avoid violating full state constraints in every step of the backstepping design. All closed- loop signals are uniformly ultimately bounded and the output tracking error converges to the neighborhood of zero, which can be verified by using the Lyapunov stability theorem. Two simulation examples reveal the performance of the adaptive NN control approach. Index TermsmAdaptive control, neural networks （NNs）, non- linear pure-feedback systems, time-varying constraints.

关键词： Adaptive control neural networks(NNs) nonlinear pure-feedback systems time-varying constraints

Effects of inductive methods on dunging behavior of weaning pigs in slatted floor pens

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International Journal of Agricultural and Biological Engineering 2016年第4期9卷 192-198页

作者： Wang Yu li dapeng Shen Xiong Shi Zhengxiang Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of AgricultureBeijing 100083China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300072China

The excreta of pig is generally utilized to induce pigs to excrete in particular area,which reduces the subsequent work required to clean *** paper discussed a new induction device design based on the biological characteristics of *** different induction materials in the devices,the frequency and location of the excretory behavior of pigs through five treatments and a control group were *** to the results,different induction methods had significant(p<0.05)effects on frequency and duration of excretory *** to the conventional induction method,the induction devices were significantly(p<0.05)more effective in training pigs to excrete in the assigned area,the most effective material used in the induction devices was *** the inductive feces had been preserved in the air for a longer time,the effect of inducing excretory behavior would have been more *** devices did not work to induce pigs to excrete in the induction area.

关键词： animal behavior weaning pigs slatted floor pen pig training excretory behavior inductive material

Resource prediction and assessment based on 3D/4D big data modeling and deep integration in key ore districts of North China

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Science China Earth Sciences 2021年第9期64卷 1590-1606页

作者： Gongwen WANG Zhiqiang ZHANG Ruixi li Junjian li Deming SHA Qingdong ZENG Zhenshan PANG dapeng li Leilei HUANG School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing100083China Tianjin Geological Survey Center of China Geological Survey Tianjin300170China Shenyang Geological Survey Center of China Geological Survey Shenyang110000China Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Institutions of Earth Science Chinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China Development Research Center of China Geological Survey Beijing100037China Shandong Academy of Geological Sciences Jinan250013China

The North China district has been subjected to significant research with regard to the ore-forming dynamics,processes,and quantitative forecasting of gold deposits;it accounts for the highest number of gold reserves and annual products in *** on the top-level design of geoscience theory and the method adopted by the National Key R&D Project(deep process and metallogenic mechanism of North China Craton(NCC)metallogenic system),this paper systematically collects and constructs the geoscience data(district,camp,and deposit scales)in four key gold districts of North China(Jiaojia-Sanshandao,Southern Zhaoping,Wulong,and Qingchengzi).The settings associated with the geological dynamics of gold deposits were quantitatively and synthetically analyzed,namely:NCC destruction,metallogenic events,genetic models,and exploration ***-dimensional(3D)and four-dimensional(4D)geological modeling was performed using the big data on the districts,while the district-scale 3D exploration criteria were integrated to construct a quantitative exploration *** them,FLAC3D modelling and the Geo Cube software(version 3.0)were used to implement the numerical simulation of the 3D geological models and the constraints of the fluid saturation parameters of the Jiaojia fault to reconstruct the 4D fault structure models of the Jiaojia fault(with a depth of 5000 m).Using Geo Cube3.0,multiple integration modules(general weights of evidence(Wof E),Boost Wof E,Fuzzy Wof E,Logistic Regression,Information Entropy,and Random Forest)and exploration criteria were integrated,while the C-V fractal classification of A,B and C targets in four districts was carried *** research results are summarized in the following four areas:(1)Four gold districts in the study area have more than three targets(the depth is 3000 m),and the class A,B and C targets exhibit a good spatial correlation with gold bodies that are controlled by mining engineering at depths greater than 1000 m.(2)The Boost Wof

关键词： Geoscience big data 3D/4D modeling Weights of evidence Random forest Target optimization and resources assessment Gold district in North China

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Magma Origin and Evolution of Tengchong Cenozoic Volcanic Rocks from West Yunnan,China:Evidence from Whole Rock Geochemistry and Nd-Sr-Pb Isotopes

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Acta Geologica Sinica(English Edition) 2012年第4期86卷 867-878页

作者： li dapeng LUO Zhaohua liU Jiaqi CHEN Yuelong JIN Ye State Key Laboratory of Geological Processes and Mineral Resources School of Earth Science and ResourcesChina University of Geosciences Institute of Geology and Geophysics Chinese Academy of Sciences School of Ocean Sciences China University of Geosciences

Tengchong Cenozoic volcanics that have record key information on the tectonic evolution and mantle features of the southeast margin of the Tibetan Plateau are of great importance because of its unique eruption history spanning the entire Quaternary period. Magma origin and evolution of Tengchong Cenozoic volcanic rocks were studied on the basis of Nd-Sr-Pb isotope and major and trace element data from different eruptions in the Ma＇anshan area. Different samples within one eruption show relative identical lithologies, chemical and isotopic compositions. However, the geochemical features for the five eruptions are distinct from each other. These volcanic rocks show low Mg# values （〈45）, moderate to high fractionation of LREEs and HREEs, and enrichment of Pb and Ba and depletion of Nb. Tengchong Cenozoic volcanic rocks were derived from an enriched mantle based on Nd-Sr-Pb isotopic studies. And lines of evidence show that crustal contamination should be involved before the eruption of different periods of Tengchong Cenozoic volcanic rocks. Older subducted components may be responsible for adakite recycling at various stages of evolution, which results in the origin of the enriched mantle source magma accounting for the isotopic features of Tengchong Cenozoic volcanic rocks. Segregated primitive magma pulsating injected into magma chamber, fractional crystallized and contaminated with crust component. Finally, magmas with distinct chemical and isotopic compositions for each eruption formed. The extension of the northeast segment of the Yingjiang tectonic belt triggered the pulsating eruption of the Cenozoic volcanics in the Tengchong area.

关键词： Cenozoic volcanism Nd-Sr-Pb isotopes geochemistry Tengchong

A Self-Adaptive Back-off Optimization Scheme Based on Beacons Probability Prediction for Vehicle Ad-Hoc Networks

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China Communications 2016年第12期13卷 132-138页

作者： Haitao Zhao Aiqian Du Hongbo Zhu dapeng li Nanjie liu College of Communication and Information Engineering Nanjing University of Posts and Telecommunications

In order to improve the broadcast reception rates of beacon messages in vehicle ad-hoc networks,a conclusion that the relationship between collision probability and minimum contention window size and the relationship between expiration probability and minimum window size was reached by building a Markov model. According to this conclusion, a back-off algorithm based on adjusting the size of minimum contention window called CEB is proposed, and this algorithm is on the basis of the differential size between the number of expiration beacons and preset threshold. Simulations were done to compare the performance of CEB with that of RBEB and BEB, and the results show that the performance of the new proposed algorithm is better than that of RBEB and BEB.

关键词： vehicle ad-hoc networks back off beacon expiration probability collision probability