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Decoupled δ^(13)Ccarb and δ^(13)Corg records at Triassic–Jurassic boundary interval in eastern Tethys: Environmental implications for spatially different global response

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geoscience Frontiers 2021年第4期12卷 175-184页

作者： Yuzhu ge Department of Earth Sciences Khalifa University of Science and TechnologyPO Box 127788Abu DhabiUnited Arab Emirates Institute of geology Mineralogy and GeophysicsRuhr-University Bochum44780 BochumGermany

Althoughδ^(13)C data(eitherδ^(13)Ccarb orδ^(13)Corg)ofmany Triassic–Jurassic(T-J)sections have been acquired,pairedδ^(13)Ccarb andδ^(13)Corg from continuous T-J carbonate sections,especially in eastern Tethys,have been scarcely *** study presents paired and decoupledδ^(13)Ccarb andδ^(13)Corg data from a continuous T-J carbonate section in Wadi *** T-J Wadi Naqab carbonate section,located in United Arab Emirates,Middle East,represents tropical and shallow marine sedimentation in eastern *** the T-J boundary interval,an initial carbon isotope excursion(CIE)is observed with different magnitude of isotope excursion and timing inδ^(13)Ccarb andδ^(13)Corg,while subsequently a positive CIE is only distinct inδ^(13)*** on petrological,carbon isotope,Rock-Eval and elemental analyses,theδ^(13)Ccarb is thought to record marine inorganic carbon,and theδ^(13)Corg to record terrigenous organic ***,the pairedδ^(13)Ccarb andδ^(13)Corg herein potentially document simultaneous changes in T-J atmospheric and marine settings of eastern *** decoupled behavior may likely be caused by different changes or evolution of carbon pool between marine and atmospheric *** initial CIE present in bothδ^(13)Ccarb andδ^(13)Corg may indicate influence of isotopically light carbon release related to CAMP activity in both atmospheric and marine *** following positive CIE only inδ^(13)Ccarb suggests relatively steady carbon isotope composition in atmosphere,but enhanced burial of isotopically light carbon in marine ***,the T-J carbonates in the studied section were possibly deposited in normal and oxic shallow marine *** correlation based on the Wadi Naqab section and other T-J sections suggests spatially different T-J environmental parameters:in eastern Tethys and western Panthalassa,oxic condition,lacking organic-rich sediment,weaker ocean acidification and less influence of isotopically light carbon ar

关键词： Triassic–Jurassic δ^(13)C records Eastern Tethys Global difference

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Diffusion process in enzyme-metal hybrid catalysts

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 921-929页

作者： Shitong Cui Jun ge Key Lab for Industrial Biocatalysis Ministry of EducationDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084China Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China

Enzyme-metal hybrid catalysts bridge the gap between enzymatic and heterogeneous catalysis,which is significant for expanding biocatalysis to a broader *** studies have demonstrated that the enzyme-metal hybrid catalysts exhibited considerably higher catalytic efficiency in cascade reactions,compared with that of the combination of separated enzyme and metal ***,the precise mechanism of this phenomenon remains ***,we investigated the diffusion process in enzyme-metal hybrid catalysts using Pd/lipase-Pluronic conjugates and the combination of immobilized lipase(Novozyme 435)and Pd/C as *** reference to experimental data in previous studies,the Weisz-Prater parameter and efficiency factor of internal diffusion were calculated to evaluate the internal diffusion limitations in these ***,a kinetic model was developed and fitted to describe the proximity effect in hybrid *** indicated that the enhanced catalytic efficiency of hybrid catalysts may arise from the decreased internal diffusion limitation,size effect of Pd clusters and proximity of the enzyme and metal active sites,which provides a theoretical foundation for the rational design of enzyme-metal hybrid catalysts.

关键词： enzyme-metal hybrid catalyst internal diffusion proximity effect kinetic model

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Fan-lan Tai:a pioneer of plant pathology and mycology in China

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Protein & Cell 2023年第3期14卷 159-161页

作者： Yejing ge Department for the History of Science and Scientific Archaeology University of Science and Technology of ChinaHefei 230026China

Earlystudies inChina and theUnited States ,Fan-lan Tai(戴芳澜,1893-1973)was borm in Jiangling,Hubei Province,to a dwindling family of bureaucratic landowners(Fig.1).His grandfather,Hongxi Tai(戴洪禧),was a local township official in Longquan,Zhejiang *** father,Jing Tai(戴经),was a senior licentiate in the late Qing *** mother died when he was 8 years *** he was 12,he attended the Higher Primary School affliated with Nanyang Mission College in *** withdrew from school for a year because of his family's financial *** was transferred to Wuchang Wenhua School,where he again withdrew the following *** 1907,Fan-lan Tai and his brother entered Shanghai Aurora School,a missionary school with a focus on French teaching,laying a firm academic foundation and reinforcing his desire to continue studying.

关键词： Aurora transferred pioneer

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Effect of Sacrificial Anode Protection for Steel Pipe Piles at Dandong Port

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China Ocean Engineering 1998年第1期13卷 113-120页

作者： Zhu, XC ge, Y ge, RG Nanjing Hydraul Res Inst Dept Mat & Struct Nanjing 210024 Peoples R China

The sacrificial anode protection system for the steel pipe piles of the 3rd berth of Dandong; wharf at Dandong port has operated for eight years. In this paper, the program design and the protection effect of the sacrificial anode protection system are presented. The results of various inspections show that the piles are protected very satisfactorily.

关键词： steel pipe pile corrosion sacrificial anode cathodic protection protection potential protection percentage

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ALCencryption:A Secure and Efficient Algorithm for Medical Image Encryption

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Computer Modeling in Engineering & Sciences 2020年第12期125卷 1083-1100页

作者： Jiao ge College of Computer Science and Technology Hengyang Normal UniversityHengyang421002China Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang421002China

With the rapid development of medical informatization and the popularization of digital imaging equipment,DICOM images contain the personal privacy of patients,and there are security risks in the process of storage and transmission,so it needs to be *** order to solve the security problem of medical images on mobile devices,a safe and efficient medical image encryption algorithm called ALCencryption is *** algorithm first analyzes the medical image and distinguishes the color image from the gray *** gray images,the improved Arnold map is used to scramble them according to the optimal number of iterations,and then the diffusion is realized by the Logistic and Chebyshev map cross-diffusion *** color image is encrypted by cross-diffusion algorithm of double chaotic *** and efficiency analysis show that the ALCencryption algorithm has the characteristics of small neighboring pixels,large key space,strong key sensitivity,high safety and short encryption *** is suitable for medical image encryption of mobile devices with high real-time requirements.

关键词： Patient privacy DICOM medical image encryption scrambling degree cross-diffusion

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Electromagnetic interference modeling and elimination for a solar/hydrogen hybrid powered small-scale UAV

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Chinese Journal of Aeronautics 2023年第10期36卷 293-308页

作者： Jiahao ge Li LIU School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

The trajectory related and Direct Current(DC)Electromagnetic Interference(EMI)of lithium battery,fuel cell and photovoltaic modules has a great influence on the small-scale Unmanned Aerial Vehicle(UAV)airborne magnetometer and is hard to be shielded,calibrated or ***,the mechanisms underlying the DC EMI have been rarely investigated *** cope with this problem,this paper systematically studies the EMI models,and proposes an online 3-layer EMI reduction ***,EMI coupled with UAV motion model and hybrid power system is ***,the mechanism EMI models of hybrid power system are established and verified based on the proposed concept“equivalent current”.Third,an online 3-layer EMI reduction scheme is proposed,including battery layer,trajectory planning layer and energy management *** the first main layer,EMI self-cancellation is realized by rotating battery inclinations and symmetrical *** response to errors,the trajectory planning layer reduces the EMI intensity by optimizing an optimal trajectory,while the energy management layer prioritizes power allocation to power sources that can produce small and stable *** results of climb,level flight and descent illustrate the efficaciousness and applicability of the proposed online 3-layer EMI reduction scheme.

关键词： Electromagnetic interference EMI reduction Energy management Hybrid powered UAV Mechanism modeling Trajectory planning

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An analytical method for studying double Hopf bifurcations induced by two delays in nonlinear differential systems

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Science China(Technological Sciences) 2020年第4期63卷 597-602页

作者： ge JuHong XU Jian Department of Mathematics and Information Science Henan University of Economics and LawZhengzhou 450046China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

An analytical method is introduced to investigate double Hopf bifurcations induced by two delays qualitatively and *** an illustrative example,the clear procedure is demonstrated to study delay-induced weak resonant double Hopf bifurcation in a nonlinear system with multiple *** two delays are close to double Hopf bifurcation point,all solutions derived from the bifurcation are classified qualitatively and expressed *** simulations are a good agreement with our theoretical analysis,and also already work in *** results show that our work in this paper proposes a simple and valid method for investigating delay-induced double Hopf *** important feature of our work is that the explicit expression of periodic solutions is easy to be obtained by solving algebraic equations.

关键词： analytical methods multiple delays double Hopf bifurcation the coexistence of periodic motion

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Fixed-time Sliding Mode Formation Control of AUVs Based on a Disturbance Observer

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 539-545页

作者： Zhenyu Gao ge Guo School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819 School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China(

In this paper,we investigate formation tracking control of autonomous underwater vehicles(AUVs)with model parameter uncertainties and external *** external disturbances due to the wind,waves,and ocean currents are combined with the model parameter uncertainties as a compound *** a disturbance observer(DO)is introduced to estimate the compound disturbance,which can be achieved within a finite time independent of the initial estimation *** on a DO,a novel fixed-time sliding control scheme is developed,by which the follower vehicle can track the leader vehicle with all the states globally stabilized within a given settling *** effectiveness and performance of the method are demonstrated by numerical simulations.

关键词： Autonomous underwater vehicles(AUVs) disturbance observer(DO) sliding mode control formation control

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Command Filtered Finite/Fixed-time Heading Tracking Control of Surface Vehicles

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IEEE/CAA Journal of Automatica Sinica 2021年第10期8卷 1667-1676页

作者： Zhenyu Gao ge Guo School of Control Engineering Northeastern University QinhuangdaoQinhuangdao 066004China State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819

This paper investigates the heading tracking problem of surface vehicles with unknown model *** on finite/fixed-time control theories and in the context of command filtered control,two novel adaptive control laws are developed by which the vehicle can track the desired heading within settling time with all signals of the closed-loop system are uniformly *** effectiveness and performance of the schemes are demonstrated by simulations and comparison studies.

关键词： Command filter finite-time control fixed-time control heading tracking control surface vehicles

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Sicien H. Chen, one of the pioneers and founders of Chinese entomology

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Protein & Cell 2022年第5期13卷 309-312页

作者： Yejing ge Department for the History of Science and Scientific Archaeology University of Science and Technology of ChinaHefei 230026China

Sicien ***(陈世骧,1905-1988)was an academician of the Chinese Academy of Sciences(CAS)and a distinguished biologist,entomologist,and evolutionary taxonomist(Fig.1).As a meticulous and diligent scientist,he discovered 76 new genera,949 new species,and contributed more than 180 publications,including articles,monographs,and conference *** *** has been included in the Who's Who of various countries and continues to be highly regarded by the international scientific community.

关键词： ent pioneer publications

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