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Experimental and numerical investigations on wave motions over platform reef-flat

Journal of Hydrodynamics 2022年第2期34卷 244-258页

作者： Hong-jun Zhao Liu-jun Zong Cheng-ji Shen Jun Kong Yu-liang Zhu Jun-da Wang College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing210024China Hohai University Key Laboratory of Coastal Disasters and Defence Ministry of EducationNanjing210024China

Previous studies have shown that high-frequency(HF)waves,low-frequency(LF)waves and wave set-up coexist on shallow coral reef-flat and jointly contribute to potential floods and subsequent damages of infrastructures and islands on it.To better understand the reef-flat wave dynamics with incident waves and still water level,a wave-flume experiment was performed based on an idealized platform reef composed of a steep reef-face(1:4),a relatively mild reef-rim(1:14)and a horizontal reef-flat.Also,the non-hydrostatic phase-resolving model SWASH was validated against the experiment and then applied to further numerically investigate the effects of reef-rim topographic features on the reef-flat wave motions.The results show that incident waves of a larger wave height and a longer wave period can generate larger LF waves and wave set-up,thereby inducing greater HF waves on the reef-flat.Higher still water level can lead to larger HF waves but result in smaller wave set-up.In contrast to HF waves and wave set-up,LF waves are minimally affected by the still water level.A rim of milder slope and larger edge depth will induce smaller HF and LF waves and set-up on the reef-flat,and thus provide better protection for the reef-flat region.Furthermore,on the reef-flat,the ratio of HF significant wave height to water depth H_(s_h)/(h_(r)+η^(-))is approximately constant;the dimensionless LF significant wave height Hs_l/H_(s0) and the dimensionless wave set-upη^(-)/[T_(p)(gH_(s0))1/2]can be related to the inverse wave steepness parameter gT_(p)^(2)/H_(s0) and the relative reef-flat submergence(h_(r)+η^(-))/H_(s0) respectively.

关键词： High-frequency waves low-frequency waves wave set-up platform reef reef-rim topographic features

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A New Species of the Genus Nanorana Günther,1896(Anura:Dicroglossidae)from Hengduan Mountains of China

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Asian Herpetological Research 2023年第4期14卷 300-318页

作者： Feirong ji shengchao SHI Shun MA cheng shen Liming CHANG jianping jiANG chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041SichuanChina University of Chinese Academy of Sciences Beijing 100049China Mangkang Biodiversity and Ecological Station Tibet Ecological Safety Monitor NetworkChangdu 854500XizangChina

An integrative study based on morphological data and mitochondrial molecular data of all known Nanorana(sensu stricto)species have revealed a new species from the Hengduan Mountains,N.huangi sp.nov.The new species can be distinguished from its congers by its:(1)medium body size,SVL 31.3–40.6 mm in adult males(n=12),39.2–48.1 mm in adult females(n=8);(2)absence of subarticular tubercles on fingers,with supernumerary tubercles below the base of the fingers small but distinct;(3)presence of dark dorsal patches without pale margins,generally creamy yellow ventral body basically,bright yellow ventral limbs;(4)small but prominent tympanum;(5)tibio-tarsal joint that reaches to the tympanum or the shoulder when hindlimbs adpressed forward towards body;(6)head length more than 30%of SVL.In addition,the new species can be separated from all other congeners by uncorrected genetic distances:ranging from 2.8%–7.5%of the mitochondrial 12S rRNA,1.1%–2.1%of the 16S rRNA,and 7.5%–11.5%of the COI.

关键词： Hengduan Mountains Nanorana huangi sp.nov. new species taxonomy

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An optimized run-length based algorithm for sparse remote sensing image labeling

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Defence Technology（防务技术） 2022年第4期18卷 663-677页

作者： shen-shen Luan Bo-wen cheng Shuai jiang Yu-hang Wu Zong-ling Li ji-yang Yu Institute of Spacecraft System Engineering Haidian DistrictBeijingChina

Labeling of the connected components is the key operation of the target recognition and segmentation in remote sensing images.The conventional connected-component labeling(CCL) algorithms for ordinary optical images are considered time-consuming in processing the remote sensing images because of the larger size.A dynamic run-length based CCL algorithm(Dy RLC) is proposed in this paper for the large size,big granularity sparse remote sensing image,such as space debris images and ship images.In addition,the equivalence matrix method is proposed to help design the pre-processing method to accelerate the equivalence labels resolving.The result shows our algorithm outperforms 22.86% on execution time than the other algorithms in space debris image dataset.The proposed algorithm also can be implemented on the field programming logical array(FPGA) to enable the realization of the real-time processing on-board.

关键词： Connected-component labeling Label equivalence resolving Hardware implementation Equivalence matrix On-board processing

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Interactions between central nervous system and peripheral metabolic organs

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Science China(Life Sciences) 2022年第10期65卷 1929-1958页

作者： Wenwen Zeng Fan Yang Wei L.shen cheng Zhan Peng Zheng ji Hu Institute for Immunology and Department of Basic Medical SciencesSchool of MedicineTsinghua UniversityBeijing 100084China Tsinghua-Peking Center for Life Sciences Beijing 100084China Beijing Key Laboratory for Immunological Research on Chronic Diseases Beijing 100084China The Brain Cognition and Brain Disease Institute Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China Department of Hematology The First Affiliated Hospital of USTCHefei National Laboratory for Physical Sciences at the MicroscaleSchool of Life SciencesDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230026China National Institute of Biological Sciences Beijing 102206China Tsinghua Institute of Multidisciplinary Biomedical Research Tsinghua UniversityBeijing 100084China Department of Neurology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400042China Institute of Neuroscience and the Collaborative Innovation Center for Brain Science Chongqing Medical UniversityChongqing 400016China Chongqing Key Laboratory of Neurobiology Chongqing 400016China

According to Descartes,minds and bodies are distinct kinds of “substance”,and they cannot have causal interactions.However,in neuroscience,the two-way interaction between the brain and peripheral organs is an emerging field of research.Several lines of evidence highlight the importance of such interactions.For example,the peripheral metabolic systems are overwhelmingly regulated by the mind(brain),and anxiety and depression greatly affect the functioning of these systems.Also,psychological stress can cause a variety of physical symptoms,such as bone loss.Moreover,the gut microbiota appears to play a key role in neuropsychiatric and neurodegenerative diseases.Mechanistically,as the command center of the body,the brain can regulate our internal organs and glands through the autonomic nervous system and neuroendocrine system,although it is generally considered to be outside the realm of voluntary control.The autonomic nervous system itself can be further subdivided into the sympathetic and parasympathetic systems.The sympathetic division functions a bit like the accelerator pedal on a car,and the parasympathetic division functions as the brake.The high center of the autonomic nervous system and the neuroendocrine system is the hypothalamus,which contains several subnuclei that control several basic physiological functions,such as the digestion of food and regulation of body temperature.Also,numerous peripheral signals contribute to the regulation of brain functions.Gastrointestinal(GI) hormones,insulin,and leptin are transported into the brain,where they regulate innate behaviors such as feeding,and they are also involved in emotional and cognitive functions.The brain can recognize peripheral inflammatory cytokines and induce a transient syndrome called sick behavior(SB),characterized by fatigue,reduced physical and social activity,and cognitive impairment.In summary,knowledge of the biological basis of the interactions between the central nervous system and peripheral organs will promote the full understanding of h

关键词： central nervous system peripheral organs adipose tissues bone metabolism gut microbiota

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Design and experiment of the bionic disc cutter for kenaf harvesters

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International Journal of Agricultural and Biological Engineering 2023年第6期16卷 116-123页

作者： Kunpeng Tian Bin Zhang Aimin ji jicheng Huang Haolu Liu cheng shen Key Laboratory of Modern Agricultural Equipment and Technology(jiangsu University) Ministry of EducationZhenjiang 212013JiangsuChina Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022JiangsuChina School of Mechanical Engineering Southeast UniversityNanjing 211189China

Aiming to ease the cutting of kenaf stalks via bionics,the bionic disc cutter was designed.The upper jaw of the Batocera horsfieldi was used as a bionic prototype.Further,to explore its dynamic performance,an indoor multi-stalk cutting experimental bench was used to simulate the field operation process.A three-factor and two-level interaction orthogonal experiment was carried out;cutting speed,stalk conveying speed(machine forward speed),and blade type(ordinary disc cutter and bionic disc cutter)were used as experiment factors.The cutting pass rate and cutting specific energy consumption were selected as evaluation indexes.The range,variance,and fuzzy comprehensive evaluation analysis were carried out on the experiment results.Moreover,the main order factors affecting the bionic cutter performance were determined-blade type,conveying speed,the interaction between the cutter speed and conveying speed,and cutter speed.The optimal parameter combination scheme had a cutter speed of 1000 r/min,conveying speed of 0.4 m/s,and included bionic blades.Under this condition,the best index was the 92%cutting pass rate,with a specific energy consumption of 4.38 J/stalk.The variance analysis has shown that,with 95%confidence,the blade type has a rather significant influence on the comprehensive index.Additionally,the conveying speed also significantly influenced it,while other factors and interactions had no notable effect.The experimental comparison under the same working condition shows that the bionic blade has better cutting effect.This study provides a reference for the development of cutter and the selection of kenaf harvester operational parameters.

关键词： kenaf harvester bionic disc cutter orthogonal experiment interaction

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Formation mechanism for the laying angle of hemp harvester based on ANSYS-ADAMS

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International Journal of Agricultural and Biological Engineering 2023年第4期16卷 109-115页

作者： jicheng Huang Li Tan Kunpeng Tian Bin Zhang Aimin ji Haolu Liu cheng shen Key Laboratory of Modern Agricultural Equipment and Technology Jiangsu UniversityMinistry of EducationZhenjiang 212013JiangsuChina Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022JiangsuChina

Aiming at the problem of large differences in the laying angle and posture of plants cut by the hemp harvester,which is unfavorable for the subsequent picking-up,this paper analyzed the laying process and laying angles,and built a conveyorplant rigid-flexible coupling model for simulating the laying of hemp plant.Moreover,the operating parameters were tested and optimized based on the central composite design theory,and carried out multi-objective optimization with the minimum laying angle as the response index.Firstly,the formation mechanism of the laying angle of hemp harvester was studied.Secondly,a test was designed with the quadratic orthogonal rotational combination test method,with the data being processed by Design-Expert.A regression mathematical model of the laying angle was built,and the influence of the interactions between factors on the laying angle was analyzed with the response surface method.Furthermore,multi-objective optimization was conducted on the regression model according to the actual production design requirements.As a result,the best combination was obtained,that is,when the forward speed is 0.7 m/s,speed ratio 1.40,and stubble height 95 mm,the minimum laying angle can be obtained,namely 124.9°.The optimization parameters were verified by the simulation and field tests.The simulation test showed that the simulated laying angle is 125.2°,with a relative error of 0.24%from the theoretical value,under the best combination of parameters.The field test showed that the average laying angle of hemp plant is 121.8°,with a relative error of 2.5%from the theoretical value,under the best combination of parameters.The results may provide a reference for the structural improvement and operating parameter control of hemp harvesters.

关键词： agricultural machinery hemp laying angle rigid-flexible coupling model optimization response surface analysis

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Synthesis of high quality Ce：YAG nanopowders by graphene oxide nanosheet-assisted co-precipitation method

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Journal of Rare Earths 2018年第2期36卷 130-134页

作者： cheng ji Qiang Gao Peng Dai Liming shen Xiaoyan Zhang Ningzhong Bao State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University Nanjing 210009 China jiangnan Graphene Research Institute Changzhou 213149 China

（Ce_（0.04）Y_（2.96））Al_5O_（12） phosphor nanoparticles were prepared by a modified co-precipitation method with graphene oxide（GO） nanosheets used as dispersing agent. The GO concentration is controlled at 0.0.005,0.01, 0.02, and 0.03 g/L. The addition of lamellar GO nanosheets in the precipitant solution possibly enhances both the dispersity of precursor particles and the crystallinity of phosphor nanoparticles. Pure Ce-doped YAG phase is obtained by calcining the precipitate at 1000 ℃ for 3 h. The（Ce_（0.04）Y_（2.96））Al_5 O_（12）phosphor nanoparticles have an average size of 64 nm and there is no significant change on particle size with increase of the GO concentration in precipitant solution. The luminescence property of（Ce_（0.04）Y_（2.96））Al_5O_（12） phosphor nanoparticles varies with different concentrations of GO. The photoluminescence emission intensity of the optimum sample with 0.02 g/L GO is about 1.6 times higher than the sample without using GO.

关键词： Ce：YAG GO Phosphor Photoluminescence Nanoparticles Rare earths

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Fuzheng Huayu Formula(扶正化瘀方) Prevents Rat Renal Interstitial Fibrosis Induced by HgCl2 via Antioxidative Stress and Down-regulation of Nuclear Factor-Kappa B Activity

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Chinese Journal of Integrative Medicine 2017年第8期23卷 598-604页

作者： YUAN ji-li TAO Yan-yan WANG Qing-lan shen Li LIU cheng-hai Institute of Liver Diseases Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shangha 201203 China Shanghai Key Laboratory of Traditiona Chinese Clinical Medicine Shanghai 201203 China E-Institute of TCM Internal Medicine Shanghai Municipa Education Commission Shanghai 201203 China

Objective：To investigate the mechanism of action of Fuzheng Huayu Formula（扶正化瘀方,FZHY）against renal interstitial fibrosis（RIF）relating to oxidative injury and nuclear factor-kappa B（NF-κB）activity.Methods：Thirty-two Sprague-Dawley rats were randomly divided into 3 groups：normal group,model group and FZHY treatment group.The RIF model was induced by oral administration of HgC l2 at a dose of 8 mg/kg body weight once a day for 9 weeks.Meanwhile,rats in FZHY treatment group orally took FZHY at a dose of4.0 g/kg rat weight for 9 weeks.The content of hydroxyproline（Hyp）and collagen deposition in kidney were observed.The activities of superoxide dismutase（SOD）and glutathione peroxidase（GSH-Px）,the content of glutathione（GSH）and malondialdehyde（MDA）of kidney were tested.The expressions of inhibitor-κappa B（IκB）,phospho-IκB（p-IκB）,tumor necrosis factor-α（TNF-α）,matrix metalloproteinase-2（MMP-2）andα-smooth muscle actin（α-SMA）were analyzed by Western blot.α-SMA expression was also observed by immunofluorescent staining.MMP-2 activity was measured by gelatin zymography.NF-κB activation was determined by electrophoretic mobility shift assay.Results：Renal interstitial fibrosis was induced by Hg Cl2,demonstrated by remarkably increased Hyp contents and excessive collagen deposition in kidney（P〈0.01）.FZHY significantly inhibited renal interstitial collagen deposition and reduced Hyp content of the Hg Cl2-treated rats（P〈0.01）.GSH content decreased obviously,and MDA content increased significantly in HgC l2-treated rats compared with that of normal rats（P〈0.01）.FZHY significantly increased GSH content and decreased MDA content in the model rats（P〈0.01）.The expressionα-SMA was increased in model rats compared with that of normal rats,FZHY significantly decreased its expression（P〈0.01）.The expressions of p-IκB and TNF-αand MMP-2,MMP-2 activity,and NF-κB activation were increased in model group compared with that in normal group（P〈0.01）,FZHY significantly decreased NF-κB activation,MMP-2 activity and p-IκB and TNF-αexpressions（P〈0.01

关键词： Fuzheng Huayu Formula renal interstitial fibrosis mercuric chloride oxidative stress nuclearfactor-kappa B matrix metalloproteinase-2 tumor necrosis factor- α Chinese medicine

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Design and test of two-wheeled walking hemp harvester

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International Journal of Agricultural and Biological Engineering 2020年第1期13卷 127-137页

作者： jicheng Huang cheng shen Aimin ji Kunpeng Tian Bin Zhang Xianwang Li Qiaomin Chen College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022China Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China School of Mechanical Engineering Southeast UniversityNanjing 211189China

Aiming at the planting characteristics of hemp in southern hilly regions,a two-wheeled walking hemp harvester suitable for harvesting hemp in southern hilly regions is studied and designed.The harvester mainly consists of a header frame,single-moving cutter,cutter mechanical transmission,stalk lifter and reel,stalk divider,stalk horizontal conveyor,wheeled chassis,motor,gearbox,etc.To improve the cutting performance of the two-wheeled walking hemp harvester,response surface tests of three levels are conducted for three factors influencing the operation quality,including the cutting speed,blade length,and forward speed,on the constructed hemp cutting test bench.Moreover,test results are analyzed with the response surface method,and multi-objective optimization is carried out for the regression mathematical model with Design-Expert software.Results show that when the cutting speed is 1.2 m/s,the blade length is 120 mm,forward speed is 0.6 m/s,the cutting efficiency is 38.92 stalks/s,the cutting power is 776.37 W and the failure rate is 6.24%.Trial production of sample machine and field trial are finished according to the optimized parameters and structural design scheme,and the test results reveal that the cutting rate can reach 92.5%,the rate of transmission can reach 86.7%,the productivity is 0.18 hm2/h,and all performance indexes can meet the design requirements.This research can provide references for resolving the mechanical harvesting of hemp.

关键词： hemp harvester structural design parameter optimization productivity

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Traffic accidents of autonomous vehicles based on knowledge mapping:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第6期10卷 1061-1073页

作者： Wei ji Quan Yuan Gang cheng shengnan Yu Min Wang Zefang shen Tiantong Yang Fada Institute of Forensic Medicine&Science China University of Political Science and LawBeijing 100088China State Key Laboratory of Intelligent Green Vehicle and Mobility School of Vehicle and MobilityTsinghua UniversityBeijing 100084China China University of Political Science and Law Beijing 100088China

As a characteristic representative of the new generation of vehicles,autonomous driving is expected to improve people's driving experience.The study on traffic accident of autonomous vehicles(AVs)helps provide suggestions for autonomous driving safety from multiple disciplines and perspectives,and provide support for formulating traffic accident treatment schemes.Knowledge mapping,as a cutting-edge research method in bibliometrics,scientifically and objectively displays the relevant research status using visual means.This paper uses CiteSpace 6.1.r3 to analyze 5068 related literature on the Web of Science database from 1991 to 2022 and finds out major thematic clusters,important documents and representative journals according to citation frequency.The results show that research on traffic accidents involving AVs focuses on accident preventing technologies,including how to avoid collisions,track lane-position,and enhance vehicle-toeverything(V2X)communication.This paper extracts the mean research topics and key points involved in the field and illustrates journals related to AVs and traffic accidents,which provides guidance for subsequent researchers to carry out in-depth research and contribute their papers.Popular journals are in disciplines of mathematics,systems,computer,economics,and social science.This paper also suggests scholars to consider the aspects of scene reconstruction,cause analysis,and injury of vulnerable road users,so as to investigate traffic accidents and put forward effective treatment schemes to reduce AV accidents,and ultimately improve road safety.

关键词： Traffic accident Autonomous vehicle Knowledge mapping Bibliometric CiteSpace

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