检索结果-南通市图书馆

Geoscience Frontiers 2024年第1期15卷 29-38页

作者： Chuan Yang yue yin Jiantong Zhang Penghui Ding Jian Liu China Transport Telecommunications and Information Center Beijing 100011PR China China Nuclear Power Engineering Co. LtdBeijing 100011PR China

The accurate prediction of displacement is crucial for landslide deformation monitoring and early *** study focuses on a landslide in wenzhou Belt Highway and proposes a novel multivariate landslide displacement prediction method that relies on graph deep learning and Global Navigation Satellite System(GNSS)*** model the graph structure of the monitoring system based on the engineering positions of the GNSS monitoring points and build the adjacent matrix of graph *** construct the historical and predicted time series feature matrixes using the processed temporal data including GNSS displacement,rainfall,groundwater table and soil moisture content and the graph *** introduce the state-of-the-art graph deep learning GTS(Graph for Time Series)model to improve the accuracy and reliability of landslide displacement prediction which utilizes the temporal-spatial dependency of the monitoring *** approach outperforms previous studies that only learned temporal features from a single monitoring point and maximally weighs the prediction performance and the priori graph of the monitoring *** proposed method performs better than SVM,XGBoost,LSTM and DCRNN models in terms of RMSE(1.35 mm),MAE(1.14 mm)and MAPE(0.25)evaluation metrics,which is provided to be effective in future landslide failure early warning.

关键词： Landslide displacement prediction GNSS positioning Graph deep learning

Long-term straw addition promotes moderately labile phosphorus formation, decreasing phosphorus downward migration and loss in greenhouse vegetable soil

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2022年第9期21卷 2734-2749页

作者： ZHANG yin-jie GAO Wei LUAN Hao-an TANG Ji-wei LI Ruo-nan LI Ming-yue ZHANG Huai-zhi HUANG Shao-wen Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China Institute of Agricultural Resources and Environment Tianjin Academy of Agricultural SciencesTianjin 300192P.R.China College of Forestry Hebei Agricultural UniversityBaoding 071000P.R.China Institute of Agricultural Resources and Environment Hebei Academy of Agriculture and Forestry SciencesShijiazhuang 050051P.R.China

Phosphorus(P) leaching is a major problem in greenhouse vegetable production with excessive P fertilizer application. Substitution of inorganic P fertilizer with organic fertilizer is considered a potential strategy to reduce leaching, but the effect of organic material addition on soil P transformation and leaching loss remains unclear. The X-ray absorption nearedge structure(XANES) spectroscopy technique can determine P speciation at the molecular level. Here, we integrated XANES and chemical methods to explore P speciation and transformation in a 10-year field experiment with four treatments: 100% chemical fertilizer(4 CN), 50% chemical N and 50% manure N(2CN+2MN), 50% chemical N and 50% straw N(2CN+2SN), and 50% chemical N and 25% manure N plus 25% straw N(2CN+2 MSN). Compared with the 4 CN treatment, the organic substitution treatments increased the content of labile P by 13.7–54.2% in the 0–40 cm soil layers, with newberyite and brushite being the main constituents of the labile P. Organic substitution treatments decreased the stable P content;hydroxyapatite was the main species and showed an increasing trend with increasing soil depth. Straw addition(2CN+2SN and 2CN+2 MSN) resulted in a higher moderately labile P content and a lower labile P content in the subsoil(60–100 cm). Moreover, straw addition significantly reduced the concentrations and amounts of total P, dissolved inorganic P(DIP), and particulate P in leachate. DIP was the main form transferred by leaching and co-migrated with dissolved organic carbon. Partial least squares path modeling revealed that straw addition decreased P leaching by decreasing labile P and increasing moderately labile P in the subsoil. Overall, straw addition is beneficial for developing sustainable P management strategies due to increasing labile P in the upper soil layer for the utilization of plants, and decreasing P migration and leaching.

关键词： K-edge XANES phosphorus speciation leaching losses sustainable phosphorus management greenhouse vegetable production

Velocity and density contrasts across the Moho interface of Guangdong province in south China constrained by receiver functions

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2020年第3期33卷 141-152页

作者： yin-Ping Qian Xu-Zhang Shen Xin Zhang wen-Jun Zheng yue-Jun Wang Guangdong Provincial Key Laboratory of Earthquke Early Warning and Safety Diagnosis of Major Projects Guangdong Earthquake AgencyGuangzhou 510070China School of Earth Science and Engineering Sun Yat-sen UniversityGuangzhou 510070China CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China

The P receiver function includes P-to-SV converted phases and multiple reverberations of the discontinuities in the crust and *** time of these phases is related to the crustal thickness and vp/vs ratio,and the amplitude of these phases is mainly controlled by the velocity and density contrast of *** using H-κstacking method,this work estimated the crustal thickness and vP/vS ratio beneath the stations in the Guangdong province of South *** velocity and density contrast(δβ-δρ)scanning stacking algorithm of the receiver function is applied to constrain the velocity and density contrast of the Moho in Guangdong *** work analyzed the results of the crustal thickness,vp/vS ratio,and the velocity and density contrasts of *** results indicate that the velocity contrast is higher beneath Yangjiang area in western Guangdong province and Nanao area in eastern Guangdong,which has a strong correlation with the distribution of geothermal springs in local areas and the characteristics of high heat *** velocity contrast of Moho has also a good correlation with the vP/vS ratio and the crustal thickness,which indicates that there is a strong material composition contrasts of the Moho in the study *** and density contrasts of Moho in some local area(such as western Guangdong)are somewhat consistent with the seismic activities.

关键词： Moho discontinuity velocity contrast density con—trast receiver function Guangdong province

Relationship between fluorescence characteristics and molecular weight distribution of natural dissolved organic matter in Lake Hongfeng and Lake Baihua,China

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2006年第1期51卷 89-96页

作者： yue Lanxiu WU Fengchang LiU Congqiang LI wen FU Pingqing BAI yingchen WANG Liying yin Zuoying Lü Zhicheng State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Shougang Institute of Technology Beijing 100041 China

Dissolved organic matter (DOM) is one of the most interesting and difficult problems in recent years due to its important functions in the ecological and environmental system and the complexity of its chemical composition and structure. It is well ac- cepted that fluorescence characteristics and mo- lecular weight distribution are two important pa- rameters in the DOM characterization. However, the relationship between them is still unknown. In this study, fluorescence and molecular weight distribution of DOM in Lake Hongfeng, Lake Baihua and their rivers, and their relationship were investigated using the combination of fluorescence spectroscopy and high-performance size exclusion chromatography (HPSEC) with on-line UV absorbance and fluores- cence detectors. The results show that there were two obvious humic-like fluorescence peaks (Peaks A and B) in DOM from lake water. But there was an- other obvious protein-like fluorescence peak (Peak C) in DOM from river water. The humic-like fluorescence material consisted of DOM fraction with smaller mo- lecular weight, ranging from 1.0 to 3.0 kDa, while the protein-like fluorescence material mainly consisted of DOM fraction with MW larger than 2.0 kDa. The cal- culation of MW using HPSEC was related to the UV absorbance wavelength chosen.

关键词：荧光性能分子量色谱分析溶解有机物湖泊吸光度

Paternal Zn-deficiency abolishes metabolic effects in offspring induced by diet type

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2022年第1期8卷 310-320页

作者： Guanya Li Zhenglin Dong Shusheng yue Dan Wan Yulong yin Key Laboratory of Agro-Ecological Processess in Subtropical Region Hunan Research Center of Livestock&Poultry SciencesSouth-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of AgricultureInstitute of Subtropical AgricultureThe Chinese Academy of SciencesChangshaHunan 410125China Hunan International Joint Laboratory of Animal Intestinal Ecology and Health Laboratory of Animal Nutrition and Human HealthCollege of Life SciencesHunan Normal UniversityChangshaHunan410081China

Accumulating evidence implicates that offspring are susceptible to paternal alterations in numerous fetal disorders,such as growth and metabolic ***,less study has been conducted to define the relationship between paternal zinc deficiency(ZnD)and energy metabolism of *** the present study,we used a paternal ZnD exposure(Zn at 0.3 mg/g)model to test energy metabolism of male and female offspring with the intervention of diet type(high-fat diet and low-fat diet).Our results demonstrated that paternal ZnD decreased body weight(BW)gain per week(P<0.01)and ME intake per week(P<0.05)at 11 weeks in male offspring with high-fat diet intervention but not in female ***,anabolism and catabolism of hepatic energy products also exhibited *** attenuated liver glucose but increased lipids content accompanied with elevated adiponectin and reduction in leptin level in serum,which exhibited lipid metabolic disturbance and smaller ratio of liver weight to BW in male but not female *** qRT-PCR and liver energy metabolites analysis revealed that paternal ZnD mainly induced reduction in glucose tolerance and lowered glucose uptaking ability in male offspring and thereby alleviated glycolysis and the tricarboxylic acid cycle(TCA)cycle,which displayed a male ***,we propose that paternal ZnD abolishes metabolic effects in male offspring induced by diet type *** findings reveal a novel link between paternal Zn-D and offspring energy metabolism.

关键词： Zinc-deficiency Paternal Energy metabolism Offspring

Diversity and geographical distribution of haptophyte Phaeocystis in the Chinese seas based on metabarcoding analysis

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6期41卷 2197-2207页

作者： Qingshang SONG yue XUE Yanying ZHANG Jiehui yin Pingping SHEN Ocean School Yantai UniversityYantai 264005China

Phaeocystis is an important bloom-forming species and over 100 blooms have occurred since 1997 along the Chinese coasts,while only the species *** was *** this project,a total of 246 phytoplankton samples collected from the Bohai Sea,the Yellow Sea,and the East China Sea in April 2021 were analyzed to evaluate the species diversity and geographical distribution of the genus Phaeocystis based on metabarcoding 18S r DNA *** described Phaeocystis species were recognized,including ***,***,***,and ***,and each has distinguished geographical distribution *** was the most widespread and abundant species,and *** was found in the Bohai Sea and the northern Yellow Sea with substantially elevated *** was also a widespread species,but its abundance was relatively low,while *** gathered only in the southeastern East China *** temperature,phosphate as well as ammonium contents were found to be associated with the abundance of ***,***,and *** ***,two uncharacterized Phaeocystis species were detected in the Chinese seas,indicating the diversity of the genus remains underestimated worldwide.

关键词： Haptophyta Phaeocystis species diversity distribution Chinese seas amplicon sequence variant

Landing control method of a lightweight four-legged landing and walking robot

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2022年第4期17卷 33-52页

作者： Ke yin Chenkun QI yue GAO Qiao SUN Feng GAO School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The prober with an immovable lander and a movable rover is commonly used to explore the Moon’s *** rover can complete the detection on relatively flat terrain of the lunar surface well,but its detection efficiency on deep craters and mountains is relatively low due to the difficulties of reaching such places.A lightweight four-legged landing and walking robot called“FLLWR”is designed in this *** can take off and land repeatedly between any two sites wherever on deep craters,mountains or other challenging landforms that are difficult to reach by direct ground *** robot integrates the functions of a lander and a rover,including folding,deploying,repetitive landing,and walking.A landing control method via compliance control is proposed to solve the critical problem of impact energy dissipation to realize buffer *** landing experiments on a five-degree-of-freedom lunar gravity testing platform are *** the landing conditions with a vertical velocity of 2.1 m/s and a loading weight of 140 kg,the torque safety margin is 10.3%and 16.7%,and the height safety margin is 36.4%and 50.1%for the cases with or without an additional horizontal disturbance velocity of 0.4 m/s,*** study provides a novel insight into the next-generation lunar exploration equipment.

关键词： landing and walking robot lunar exploration buffer landing compliance control

Design strategy and bioimaging of small organic molecule multicolor fluorescent probes

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第12期63卷 1742-1755页

作者： Yongfei Huang Yongbin Zhang Fangjun Huo ying wen Caixia yin Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular ScienceShanxi UniversityTaiyuan 030006China Key Laboratory of Functional Molecules of Shanxi Province Research Institute of Applied ChemistryShanxi UniversityTaiyuan 030006China

Multicolor fluorescent probes based on small organic molecules have the advantages of low cost, good biocompatibility, easily modifiable molecular structures and adjustable fluorescence performance. In addition, small molecule multicolor fluorescent probes generally undergo multi-site or multi-step reactions, which means that they can be used for the specific detection of structurally similar substances in complex bio-systems. In this review, we focus on the design and application of multicolor fluorescent probes based on small organic molecules: single fluorophores with multiple reaction sites, multiple fluorophores with single reaction sites, or multiple fluorophores with multiple reaction sites. Moreover, a design strategy for multicolor fluorescent probes and its application in biological imaging are also summarized, providing a systematic plan for future research on fluorescent probes functionalized by small organic molecules. It will also play an important role in the development of additional functions for small organic molecule fluorescent probes.

关键词： multicolor fluorescence probes small organic molecules design strategy bioimaging

Rotation Angle Control Strategy for Telescopic Flexible Manipulator Based on a Combination of Fuzzy Adjustment and RBF Neural Network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2022年第4期35卷 203-226页

作者： Dongyang Shang Xiaopeng Li Meng yin Fanjie Li Bangchun wen School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

The length of fexible manipulators with a telescopic arm alters during *** dynamic parameters of telescopic fexible manipulators exhibit signifcant time-varying characteristics owing to variations in *** an increase in the manipulators’length,the nonlinear terms caused by fexibility in the manipulators’dynamic equations cannot be *** time-varying characteristics and nonlinear terms of telescopic fexible manipulators cause fuctuations in rotation angles,which afect the operation accuracy of *** this study,a control strategy based on a combination of fuzzy adjustment and an RBF neural network is utilized to improve the control accuracy of fexible telescopic ***,the dynamic equation of the manipulators is established using the assumed mode method and Lagrange’s principle,and the infuence of nonlinear terms is ***,a combined control strategy is proposed to suppress the fuctuation of the rotation angle in telescopic fexible *** variation ranges of the feedforward PD controller parameters are determined by the pole placement strategy and length of the *** rules are utilized to adjust the controller parameters in *** RBF neural network is utilized to identify and compensate the uncertain part of the dynamic model of the fexible *** uncertain part comprises time-varying parameters and nonlinear ***,numerical simulations and prototype experiments prove the efectiveness of the combined control *** results prove that the proposed control strategy has a smaller standard deviation of ***,the combined control strategy is more suitable for telescopic fexible manipulators,which can efectively improve the control accuracy of rotation angles.

关键词： Flexible manipulator RBF neural network Fuzzy control Dynamic uncertainty

An image processing method for feature extraction and dynamic tracking of particle clusters in CFBs

在线全文

学校读者我要写书评

暂无评论

Particuology 2023年第6期77卷 1-13页

作者： yue Guo Shangyi yin Shibing Lu Tao Song Huijun Ge Ping Lu School of Energy and Mechanical Engineering Nanjing Normal UniversityNanjing210023China

A new image processing method based on the high-speed camera is proposed to identify,locate,and track *** instantaneous characteristic parameters of particle clusters in the riser of the circu-lating fluidized bed(CFB)can be acquired,such as solids holdup,vertical velocity,lateral displacement,aspect ratio and *** were carried out with glass bead particles,river sand particles and FCC *** time series of images of gas-solid flow in a CFB riser with a 100 mm x 25 mm cross-section and 3.2 m in length were obtained using high-speed *** k-means++clustering algorithm is utilized to identify the clusters,centroid is applied to locate the clusters,and the cross-correlation algorithm is employed to track the specific clusters and number them to get the instantaneous characteristic *** results illustrate that the shapes of clusters in the center area are closest to circle,moving upwards at a uniform speed,while the clusters in the side-wall area are mostly elongated or long chain-like,moving slowly *** the transition area,the clusters are more complex,moving upwards at a constant speed,and having large lateral *** results show that the image processing method used in this study is successful in acquiring the dynamic and structural parameters of the clusters simultaneously.

关键词： Circulating fluidized bed Clusters Image processing Dynamic tracking