检索结果-南通市图书馆

Soliton Solutions for a Negative Order AKNS Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第11期50卷 1033-1035页

作者： JI Jie ZHAO song-lin zhang Da-Jun College of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018 China Department of Mathematics Shanghai University Shanghai 200444 China

In this short paper,bilinear form of a negative order AKNS equation is *** N-soliton solutions areobtained through Hiorta's direct method.

关键词： negative order AKNS equation Hiorta's direct method soliton solution

Electrochemical conversion of CO2 to syngas with a wide range of CO/H2 ratio over Ni/Fe binary single-atom catalysts

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第12期13卷 3206-3211页

作者： Meng zhang Zheng Hu lin Gu Qinghua zhang linghui zhang Qian song Wei Zhou Shi Hu Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin300072China Institute of Energy Hefei Comprehensive National Science CenterHefei230000China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China

A series of carbon-based binary single-atom catalysts of Fe and Ni coordinated by nitrogen are fabricated using a glucose-chelating *** on the Ni/Fe content,they exhibit a wide-range of controllable CO/H2 ratio from 0.14 to 10.86,which is meaningful to specific chemical *** durability of the catalyst is evaluated over an 8-hour period with no significant degradation of *** variation of the faradaic efficiency with Ni/Fe content is justified by density-functional-theory based calculation of the reaction barrier in both hydrogen evolution and CO2 reduction reactions.

关键词： CO2 reduction syngas binary single-atom catalyst electrocatalysis

Spatiotemporal Dynamics of Coastal Wetlands and Reclamation in the Yangtze Estuary During Past 50 Years(1960s–2015)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2018年第3期28卷 386-399页

作者： CHEN lin REN Chunying zhang Bai LI lin WANG Zongming song Kaishan Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130102 China University of Chinese Academy of Sciences Beijing 100049 China Department of Earth Sciences Indiana University-Purdue University Indianapolis 46202 USA

Reclamation is one of the fastest-growing land use type developed in coastal areas and has caused degradation and loss of coastal wetlands as well as serious environmental problems. This paper was aimed at monitoring the spatiotemporal patterns of coastal wetlands and reclamation in the Yangtze Estuary during the 1960s and 2015. Satellite images obtained from 1980 to 2015 and topography maps of the 1960 s were employed to extract changes of reclamation and coastal wetlands. Area-weight centroids were calculated to identify the movement trend of reclamation and coastal wetlands. The results show that from the 1960 s to 2015, the net area of natural wetlands declined by 574.3 km^2, while man-made wetlands and reclamation increased by 553.6 and 543.9 km^2, respectively. During the five study phases, the fastest areal change rate natural wetlands was –13.3 km^2/yr in the period of 1990–2000, and that of man-made areas was 24.7 km^2/yr in the same period, and the areal change rate of reclamation was 27.6 km^2/yr in the period of 2000–2010. Conversion of coastal wetlands mainly occurred in the Chongming Island, Changshu City and the east coast of Shanghai Municipality. Reclamation was common across coastal areas, and was mainly attributed to settlement and man-made wetlands in the Chongming Island, Lianyungang City and the east coast of Shanghai Municipality. Natural wetlands turned into farmlands and settlement, and man-made wetlands gained from reclamation of farmlands. The centroid of natural wetlands generally moved towards the sea, man-made wetlands expanded equally in all directions and inland, and the centroid of reclamation migrated toward Shanghai Municipality. Sea level rise, erosion-deposition changes, and reclamation activities together determine the dynamics of the Yangtze Estuary wetlands. However, reclamation activities for construction of ports, industries and aquaculture are the key causes for the dynamics. The results from this study on the dynamics of c

关键词： coastal wetlands reclamation remote sensing dynamics driving forces the Yangtze Estuary

Identification of clade-wide putative cis-regulatory elements from conserved non-coding sequences in Cucurbitaceae genomes

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第4期10卷 238-248页

作者： Hongtao song Qi Wang Zhonghua zhang Kui lin Erli Pang MOE Key Laboratory for Biodiversity Science and Ecological Engineering and Beijing Key Laboratory of Gene Resource and Molecular Development College of Life SciencesBeijing Normal UniversityBeijing 100875China College of Horticulture Qingdao Agricultural UniversityQingdao 266109China

Cis-regulatory elements regulate gene expression and play an essential role in the development and physiology of *** conserved non-coding sequences(CNSs)function as cis-regulatory *** control the development of various ***-ever,predicting clade-wide cis-regulatory elements across several closely related species remains *** on the relationship between CNSs and cis-regulatory elements,we present a computational approach that predicts the clade-wide putative cis-regulatory elements in 12 Cucurbitaceae *** 12-way whole-genome alignment,we first obtained 632112 CNSs in ***,we identified 16552 Cucurbitaceae-wide cis-regulatory elements based on collinearity among all 12 Cucurbitaceae ***,we predicted 3271 potential regulatory pairs in the cucumber genome,of which 98 were verified using integrative RNA sequencing and ChIP sequencing datasets from samples collected during various fruit development *** CNSs,Cucurbitaceae-wide cis-regulatory elements,and their target genes are accessible at http://***/cisRCNEs_cucurbit/.These elements are valuable resources for functionally annotating CNSs and their regulatory roles in Cucurbitaceae genomes.

关键词： elements conserved sequences

Modelling the performance of EPB shield tunnelling using machine and deep learning algorithms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第5期12卷 81-92页

作者： song-Shun lin Shui-Long Shen Ning zhang Annan Zhou Department of Civil Engineering School of Naval ArchitectureOceanand Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Intelligent Manufacturing Technology College of EngineeringShantou UniversityShantouGuangdong 515063China Discipline of Civil and Infrastructure School of EngineeringRoyal Melbourne Institute of Technology(RMIT)Victoria 3001Australia Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai Jiao Tong UniversityShanghai 200240China

This paper introduces an intelligent framework for predicting the advancing speed during earth pressure balance(EPB)shield *** artificial intelligence(AI)models based on machine and deep learning techniques-back-propagation neural network(BPNN),extreme learning machine(ELM),support vector machine(SVM),long-short term memory(LSTM),and gated recurrent unit(GRU)-are *** geological and nine operational parameters that influence the advancing speed are considered.A field case of shield tunnelling in Shenzhen City,China is analyzed using the developed models.A total of 1000 field datasets are adopted to establish intelligent *** prediction performance of the five models is ranked as GRU>LSTM>SVM>ELM>***,the Pearson correlation coefficient(PCC)is adopted for sensitivity *** results reveal that the main thrust(MT),penetration(P),foam volume(FV),and grouting volume(GV)have strong correlations with advancing speed(AS).An empirical formula is constructed based on the high-correlation influential factors and their corresponding field ***,the prediction performances of the intelligent models and the empirical method are *** results reveal that all the intelligent models perform better than the empirical method.

关键词： EPB shield machine Advancing speed prediction Intelligent models Empirical analysis Tunnel excavation

Pollution characteristics and risk assessment of organophosphate esters in aquaculture farms and natural water bodies adjacent to the Huanghe River delta

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第1期41卷 251-266页

作者： Jinyu CHAO song FENG Yingdong HAO Jianing lin Bin zhang School of Architecture and Civil Engineering Xihua UniversityChengdu 610039China Institute of Eco Environmental Forensics Shandong UniversityQingdao 266237China School of Environmental Science and Engineering Shandong UniversityQingdao 266237China School of Food and Biotechnology Xihua UniversityChengdu 610039China CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Shandong Yellow River Delta National Nature Reserve Administration Committee Dongying 257091China

To date,little attention has been paid to the effects of organophosphate esters(OPEs)pollution on aquacultural environment and aquatic product ***(Yellow)River delta area is one of the largest aquaculture centers in China,where ecological security protection is crucial in the national strategy of *** explore the pollution characteristics,bioaccumulation,and health risks of OPEs in aquaculture farms in the Huanghe River delta and natural water bodies in the adjacent seas,five species of organisms from different farm types nearby the Huanghe River delta,and the corresponding culture water and sediments were sampled in this *** total concentrations of Σ_(13)OPEs in water,sediments,and organisms were 51.53-272.18 ng/L,52.63-63.17 ng/g dry weight(dw),and 46.82-108.90 ng/g dw,*** the five types of culture ponds,the water samples from the swimming crab and hairy crab culture ponds exhibited higher OPEs,the concentration of OPEs in the sediments from the few ponds was relatively balanced,and the OPEs in the organism from the holothurian ponds was ***(1,3-dichloro-2-isopropyl pho sphate)(TDCP)was the main contaminant in water samples and tripropyl phosphate(TPrP)in sediments and ***,trisphenyl phosphate(TPhP)showed the strongest bioaccumulation ability,followed by 2-ethylhexyl diphenyl phosphate(EHDPP)and *** bioaccumulation capacities of the five species were as follows:prawn>holothurian>hairy crab>swimming crab>*** five types of organisms,as main seafood in human consumption,were at low risk of negative impacts of ***,the risk from the mixture of organophosphate flame retardants(OPFRs)still requires more attention due to the increasing consumption and production in the world.

关键词： organophosphate esters(OPEs) aquaculture farms bioaccumulation health risk assessment

Enhancing solar-driven overall water splitting via both sacrifice and noble metal free photocatalysis: copper cluster/boron-doped carbon nitride catalysts

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第11期67卷 3886-3896页

作者： Yun-Dong Cao Yuxi zhang Jian song Hong Liu Zhiyuan song lin-lin Fan Cai-Li Lv Guang-Gang Gao School of Materials Science and Engineering University of JinanJinan 250022China

The major impediment to the additional industrialization of water splitting is the high cost of the co-catalyst made of noble metals and the sacrificial reagent. A binary photocatalytic system, consisting of B-doped g-C_(3)N_(4) nanosheets(Cu_(20)@BCN-X) and atomically accurate copper clusters, is designed in this study. The copper clusters serve as co-catalysts for H_(2) evolution and exhibit Pt-like activity, whereas the nanosheets serve as carriers and semiconductor components for O_(2) evolution. Such binary system, created using simple techniques, demonstrates hydrogen bonding interactions that promote synergistic effects and efficient binding and charge transfer across the interface between the two components. Band position manipulation of carbon nitride nanosheets demonstrates a Z-scheme charge transfer mechanism between the nanosheets and copper clusters. This photocatalytic system can accomplish the photocatalytic overall water splitting process(259.9 μmol g^(-1)h^(-1)of H_(2) and 129.4 μmol g^(-1)h^(-1)of O_(2)) without using sacrificial agents or noble metal co-catalysts. This work lays the foundation for the design of overall water splitting catalysts by precisely manipulating the energy levels, and it also paves the way for commercialized photocatalytic catalysts that do not require noble metals or sacrificial chemicals.

关键词： copper clusters band modulation photocatalysts water splitting

Cockroach-inspired Traversing Narrow Obstacles for a Sprawled Hexapod Robot

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第5期19卷 1288-1301页

作者： Xingguo song Jiajun Pan Faming lin Xiaolong zhang Chunjun Chen Danshan Huang Mechanical Engineering School Southwest Jiaotong UniversityChengdu 610031China Unit 41 of Troop 32272 Chinese People’s Liberation ArmyDeyang 618408China

Inspired by the cockroach’s use of a pitch-roll mode traverses through narrow obstacles,we improve the RHex-style robot by adding two sprawl joints to adjust the body posture,and propose a novel pitch-roll approach that enables an RHex-style robot to traverse through two cylindrical obstacles with a spacing of 90 mm,about 54%body ***,the robot can pitch up against the obstacle on the one side by the cooperation of its rear and middle ***,the robot rotates one side rear leg to kick the ground fast,meanwhile the sprawl joint on the other side rotates inward to make the robot roll and fall ***,the robot can rotate the legs on the ground to move the body forward until it crosses the *** this article,both cylinder and rectangular columns are considered as the narrow obstacles for *** experiments are demonstrated by using the proposed approach,and the results show that the robot can smoothly traverse through different narrow spaces.

关键词： RHex-style robot Sprawl joint Pitch-roll mode Narrow obstacles

Expression and functional study of cholecystokinin-A receptors on the interstitial Cajal-like cells of the guinea pig common bile duct

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第38期29卷 5374-5382页

作者： Dan Xu song-lin Ma Man-lin Huang Heng zhang Department of Gastroenterology The Central Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430014Hubei ProvinceChina Key Laboratory for Molecular Diagnosis of Hubei Province The Central Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430014Hubei ProvinceChina

BACKGROUND Many studies have shown that interstitial Cajal-like cell(ICLC)abnormalities are closely related to a variety of dynamic gastrointestinal *** are pacemaker cells for gastrointestinal movement and are involved in the transmission of nerve *** To elucidate the expression profile and significance of cholecystokinin-A(CCK-A)receptors in ICLCs in the common bile duct(CBD),as well as the role of CCK in regulating CBD motility through CCK-A receptors on CBD *** The levels of tyrosine kinase receptor(c-kit)and CCK-A receptors in CBD tissues and isolated CBD cells were quantified using the double immunofluorescence labeling *** CCK-mediated enhancement of the movement of CBD muscle strips through CBD ICLCs was observed by a muscle strip contraction *** Immunofluorescence showed co-expression of c-kit and CCK-A receptors in the CBD muscularis *** of isolated CBD cells showed that c-kit was expressed on the surface of ICLCs,the cell body and synapse were colored and polygonal,and some cells presented protrusions and formed networks adjacent to the CBD while others formed filaments at the synaptic terminals of local ***-A receptors were also expressed on CBD *** concentrations ranging from 10^(-6) mol/L to 10^(-10) mol/L,CCK promoted CBD smooth muscle contractility in a dose-dependent *** contrast,after ICLC removal,the contractility mediated by CCK in CBD smooth muscle *** CCK-A receptors are highly expressed on CBD ICLCs,and CCK may regulate CBD motility through the CCK-A receptors on ICLCs.

关键词： Interstitial Cajal-like cells Tyrosine kinase receptor Common bile duct Cholecystokinin-A receptors