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Contributions of moisture sources to precipitation in the major drainage basins in the Tibetan Plateau

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Science China Earth Sciences 2022年第6期65卷 1088-1103页

作者： Ying li Fengge SU Qiuhong TANG Hongkai GAO Denghua YAN Hui PENG Shangbin xiao Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Yichang 443002China College of Hydraulic and Environmental Engineering China Three Gorges UniversityYichang 443002China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of Sciences(CAS)Beijing 100101China University of Chinese Academy of Sciences Beijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Key Laboratory of Water Cycle and Related land Surface Process Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Geographic Information Science(Ministry of Education of China) East China Normal UniversityShanghai 200241China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Water Resources DepartmentChina Institute of Water Resources and Hydropower ResearchBeijing 100038China

Tracking and quantifying the moisture sources of precipitation in different drainage basins in the Tibetan Plateau(TP)help to reveal basin-scale hydrological cycle characteristics under the interactions between the westerlies and Indian summer monsoon(ISM) systems and to improve our understanding on the mechanisms of water resource changes in the ‘Asian Water Tower' under climate changes. Based on a Eulerian moisture tracking model(WAM-2) and three atmospheric reanalysis products(ERA-I, MERRA-2, and JRA-55), the contributions of moisture sources to the precipitation in six major sub-basins in the TP were tracked during an approximately 35-year period(1979/1980–2015). The results showed that in the upper Indus(UI),upper Tarim River(UT), and Qaidam Basin(QB), the moisture sources mainly extended westward along the mid-latitude westerlies to the western part of the Eurasian continent. In contrast, in the Yarlung Zangbo River Basin(YB), inner TP(ITP), and the source area of three eastern rivers(TER, including the Nujiang River, lancang River, and Yangtze River), the moisture sources extended both westward and southward, but mainly southward along the ISM. In winter and spring, all of the sub-basins were dominated by western moisture sources. In summer, the western sources migrated northward with the zonal movement of the westerlies, and simultaneously the southern sources of the YB, ITP, and TER expanded largely toward the Indian Ocean along the ISM. In autumn, the moisture sources of the UI, UT, and QB shrank to the western sources, and the moisture sources of the YB, ITP, and TER shrank to the central-southern TP and the Indian subcontinent. By quantifying the moisture contributions from multiple sources, we found that the terrestrial moisture dominated in all of the sub-basins, particularly in the UT and QB(62–73%). The oceanic contributions were relatively high in the UI(38–42%) and YB(38–41%). In winter, evaporation from the large western water bodies(such as the M

关键词： Tibetan Plateau Precipitation Moisture sources Westerlies Indian summer monsoon Local recycling

A hint from phosphine complex: The π back-bonding in cobalt-phosphorene composite enables enhanced electrocatalytic performance

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Progress in Natural Science:Materials International 2023年第1期33卷 100-107页

作者： Xingyun li liangping xiao Hao Wang Jingting Song Qingchi Xu Meidan Ye Jun Xu Shenzhen Research Institute of Xiamen University Department of Physics Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials Xiamen University Jiujiang Research Institute of Xiamen University Department of Chemistry National University of Singapore

Regulating the electronic structure of the metal electrocatalyst is fundamental for its performance optimizing. The electronic states of the active metal centers are highly dependent on their coordination environment, especially when bonding is formed. The π back-bonding can induce great electron density redistribution around metals, yet it is barely applied in electrocatalyst design. Herein we electrodeposited metallic cobalt on black phosphorus(BP)nanosheets, forming BP-Co with a unique π back-bonding on the interfaces. The BP-Co exhibited high electrocatalytic activity and stability for hydrogen evolution reaction in alkaline electrolyte. The electrochemical and spectroscopic characterizations demonstrated that the BP acted as σ donor and π acceptor to coordinate with electron-rich metallic Co, similar to the phosphine complex. The directional σ bond strengthen the relationship between BP and Co, while the non-directional π bond accelerated the in-plane electron transfer. The π back donation also decreased the oxophilicity of Co to make BP-Co resist the poison from oxygen species. This study can intrigue new thinking prospective for the electrocatalyst design.

关键词： Black phosphorus Pi back-bonding Electrocatalyst Electrodeposition Electronic structure

Exploiting the Community Structure of Fraudulent Keywords for Fraud Detection in Web Search

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Journal of Computer Science & Technology 2021年第5期36卷 1167-1183页

作者： Dong-Hui Yang Zhen-Yu li xiao-Hui Wang Kavé Salamatian Gao-Gang Xie Network Technology Research Center Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Global Energy Interconnection Research Institute Co. Ltd.Beijing 102209China liSTIC Laboratory of Computer Science SystemsInformation and Knowledge ProcessingUniversitéSavoie Mont BlancChambéry 73011France Computer Network Information Center Chinese Academy of SciencesBeijing 100190China

Internet users heavily rely on web search engines for their intended *** major revenue of search engines is advertisements(or ads).However,the search advertising suffers from *** generate fake traffic which does not reach the intended audience,and increases the cost of the ***,it is critical to detect fraud in web *** studies solve this problem through fraudster detection(especially bots)by leveraging fraudsters'unique ***,they may fail to detect new means of fraud,such as crowdsourcing fraud,since crowd workers behave in part like normal *** this end,this paper proposes an approach to detecting fraud in web search from the perspective of fraudulent *** begin by using a unique dataset of 150 million web search logs to examine the discriminating features of fraudulent ***,we model the temporal correlation of fraudulent keywords as a graph,which reveals a very well-connected community ***,we design DFW(detection of fraudulent keywords)that mines the temporal correlations between candidate fraudulent keywords and a given list of *** particular,DFW leverages several refinements to filter out non-fraudulent keywords that co-occur with seeds *** evaluation using the search logs shows that DFW achieves high fraud detection precision(99%)and accuracy(93%).A further analysis reveals several typical temporal evolution patterns of fraudulent keywords and the co-existence of both bots and crowd workers as fraudsters for web search fraud.

关键词： community structure fraud analysis fraudulent keyword detection web search

Recent research of peptide-based hydrogel in nervous regeneration

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Bioactive Materials 2024年第10期40卷 503-523页

作者： Chunmei Xie Yueyang Chen lang Wang Kin liao Bin Xue Yulong Han lan li Qing Jiang State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Advanced Digital and Additive Manufacturing Center Khalifa University of Science and TechnologyPo Box 127788Abu DhabiUnited Arab Emirates National Laboratory of Solid State Microstructures Department of PhysicsNanjing UniversityNanjingChina State Key Laboratory of Pharmaceutical Biotechnology Division of Sports Medicine and Adult Reconstructive SurgeryDepartment of Orthopedic SurgeryDrum Tower Hospital Affiliated to Medical School of Nanjing UniversityNanjingChina Jiangsu Engineering Research Center for 3D Bioprinting NanjingChina Institute of Medical 3D Printing Nanjing UniversityNanjingChina

Neurological disorders exert significantly affect the quality of life for patients,necessitating effective strategies for nerve *** traditional autologous nerve transplantation and emerging therapeutic approaches encounter scientific challenges due to the complex nature of the nervous system and the unsuitability of the surrounding environment for cell *** engineering techniques offer a promising path for *** neural tissue engineering relies on modulating cell differentiation behavior and tissue repair by developing biomaterials that mimic the natural extracellular matrix(ECM)and establish a threedimensional ***-based hydrogels have emerged as a potent option among these biomaterials due to their ability to replicate the structure and complexity of the *** review aims to explore the diverse range of peptide-based hydrogels used in nerve regeneration with a specific focus on dipeptide hydrogels,tripeptide hydrogels,oligopeptide hydrogels,multidomain peptides(MDPs),and amphiphilic peptide hydrogels(PAs).Peptide-based hydrogels offer numerous advantages,including biocompatibility,structural diversity,adjustable mechanical properties,and degradation without adverse ***,hydrogels formed from self-assembled polypeptide nanofibers,derived from amino acids,show promising potential in engineering neural tissues,outperforming conventional materials like alginate,poly(ε-caprolactone),and ***,the simple design and cost-effectiveness of dipeptidebased hydrogels have enabled the creation of various functional supramolecular structures,with significant implications for nervous system *** hydrogels are expected to play a crucial role in future neural tissue engineering *** review aims to highlight the benefits and potential applications of peptidebased hydrogels,contributing to the advancement of neural tissue engineering.

关键词： Self-assembled Dipeptide Cyclic dipeptide Hydrogels Nervous regeneration

Radar emitter multi-label recognition based on residual network

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Defence Technology（防务技术） 2022年第3期18卷 410-417页

作者： Yu Hong-hai Yan xiao-peng liu Shao-kun li Ping Hao Xin-hong Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Institute of Telemetry Technology Beijing100081China

In low signal-to-noise ratio(SNR)environments,the traditional radar emitter recognition(RER)method struggles to recognize multiple radar emitter signals in *** paper proposes a multi-label classification and recognition method for multiple radar-emitter modulation types based on a residual *** method can quickly perform parallel classification and recognition of multi-modulation radar time-domain aliasing signals under low ***,we perform time-frequency analysis on the received signal to extract the normalized time-frequency image through the short-time Fourier transform(STFT).The time-frequency distribution image is then denoised using a deep normalized convolutional neural network(DNCNN).Secondly,the multi-label classification and recognition model for multi-modulation radar emitter time-domain aliasing signals is established,and learning the characteristics of radar signal time-frequency distribution image dataset to achieve the purpose of training ***,time-frequency image is recognized and classified through the model,thus completing the automatic classification and recognition of the time-domain aliasing *** results show that the proposed method can classify and recognize radar emitter signals of different modulation types in parallel under low SNRs.

关键词： Radar emitter recognition Image processing Parallel Residual network Multi-label

Effects of Electroacupuncture on Metabolic Changes in Motor Cortex and Striatum of 6-Hydroxydopamine-Induced Parkinsonian Rats

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Chinese Journal of Integrative Medicine 2020年第9期26卷 701-708页

作者： li Min WANG Ke SU Wen-ting JIA Jun WANG xiao-min Departments of Neurobiology and Physiology Key Laboratory for Neurodegenerative Disorders of the Ministry of EducationBeijing Key Laboratory for Parkinson's DiseaseCapital Medical UniversityBeijing Institute for Brain DisordersBeijing(100069)China

Objective:To explore the possible underlying mechanism by investigating the effect of electroacupuncture(EA)treatment on the primary motor cortex and striatum in a unilateral 6-hydroxydopamine(6-0HDA)induced rat Parkinson's disease(PD)***:Male Sprague-Dawley rats were randomly divided into sham group(n=16),model group(n=14),and EA group(n=14).EA stimulation at Dazhui(GV 14)and Baihui(GV20)was applied to PD rats in the EA group for 4 *** tests were conducted to evaluate the effectiveness of EA *** were detected by 7.0 T proton nuclear magnetic ***:Following 4 weeks of EA treatment in PD model rats,the abnormal behavioral impairment induced by 6-0HDA was *** monitoring changes in metabolic activity,ratios of myoinositol/creatine(Cr)and N-acetyl aspartate(NAA)/Cr in the primary motor cortex were significantly lower at the injected side than the non-injected side in PD rats(P=0.024 and 0.020).The ratios of glutamate+glutamine(Glx)/Cr and NAA/Cr in the striatum were higher and lower,respectively,at the injected side than the non-injected side(P=0.046 and 0.008).EA treatment restored the balance of metabolic activity in the primary motor cortex and *** addition,the taurine/Cr ratio and GIx/Cr ratio were elevated in the striatum of PD model rats compared to sham-lesioned rats(P=0.026 and 0.000).EA treatment alleviated the excessive glutamatergic transmission by down-regulating the striatal Glx/Cr ratio(P=0.001).The Glx/Cr ratio was negatively correlated with floor plane spontaneous locomotion in PD rats(P=0.027 and P=0.0007).Conclusions:EA treatment is able to normalize the metabolic balance in the primary motor cortex and striatum of PD rats,which may contribute to its therapeutic effect on motor *** striatal GIx/Cr ratio may serve as a potential indicator of PD and a therapeutic target of EA treatment.

关键词： electroacupuncture magnetic resonance spectroscopy motor cortex striatum Parkinson's disease

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基于组合目标函数的磁流变减振器优化设计

振动工程学报 2011年第6期24卷 600-606页

作者：郑玲兰晓辉李以农重庆大学机械传动国家重点实验室重庆400030

以线圈消耗功率和活塞体积为目标函数,以可调阻尼力和时间响应常数为约束条件,以几何及线圈参数为设计变量,研究使目标函数最小化的磁流变减振器结构优化设计方法。推导了流动模式磁流变减振器的阻尼力计算公式,建立了磁流变减振器时间... 详细信息

以线圈消耗功率和活塞体积为目标函数,以可调阻尼力和时间响应常数为约束条件,以几何及线圈参数为设计变量,研究使目标函数最小化的磁流变减振器结构优化设计方法。推导了流动模式磁流变减振器的阻尼力计算公式,建立了磁流变减振器时间响应常数和线圈功率表达式。以有限元分析软件ANSYS的参数化设计语言(APDL)为优化工具,对磁流变减振器进行了结构优化设计。优化结果表明:优化后磁流变减振器体积明显降低,线圈功率减小,时间常数缩短,达到了优化目的。

关键词：磁流变减振器参数化设计语言有限元优化

Mask Distillation Network for Conjunctival Hyperemia Severity Classification

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Machine Intelligence Research 2023年第6期20卷 909-922页

作者： Mingchao li Kun Huang xiao Ma Yuexuan Wang Wen Fan Qiang Chen School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Department of Ophthalmology The First Affiliated Hospital with Nanjing Medical UniversityNanjing210029China

To achieve automatic,fast and accurate severity classification of bulbar conjunctival hyperemia severity,we proposed a novel prior knowledge-based framework called mask distillation network(MDN).The proposed MDN consists of a segmentation network and a classification network with teacher-student *** segmentation network is used to generate a bulbar conjunctival mask and the classification network divides the severity of bulbar conjunctival hyperemia into four *** the classification network,we feed the original image and the image with the bulbar conjunctival mask into the student and teacher branches respectively,and an attention consistency loss and a classification consistency loss are used to keep a similar learning mode for these two *** design of“different input but same output”,named mask distillation(MD),aims to introduce the regional prior knowledge that“bulbar conjunctival hyperemia severity classification is only related to the bulbar conjunctiva region”.Extensive experiments on 5117 anterior segment images have proven the effectiveness of mask distillation technology:1)The accuracy of the MDN student branch is 3.5%higher than that of a single optimal baseline network and 2%higher than that of the baseline network combination.2)In the test phase,only the student branch is needed,and no additional segmentation network is *** framework only takes 0.003 s to classify a single image,achieving the fastest speed in all the methods we compared.3)Compared with a single baseline network,the attention of both teacher and student branches in the MDN has been intuitively improved.

关键词： Mask distillation(MD) conjunctiva hyperemia attention mechanism severity classification deep learning

Controllable laning phase for oppositely driven disk systems

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Chinese Physics B 2019年第12期28卷 123-129页

作者： lin liu Ke li xiao-lin Zhou lin-li He lin-Xi Zhang Department of Physics Zhejiang UniversityHangzhou 310027China Department of Physics Wenzhou UniversityWenzhou 325035China

A two-dimensional binary driven disk system embedded by impermeable tilted plates is investigated through nonequilibrium computer simulations. It is well known that a binary disk system in which two particle species are driven in opposite directions exhibits jammed, phase separated, disordered, and laning states. The presence of tilted plates can not only advance the formation of laning phase, but also effectively stabilize laning phase by suppressing massively drifting behavior perpendicular to the driving force. The lane width distribution can be controlled easily by the interplate distance. The collective behavior of driven particles in laning phase is guided by the funnel-shaped confinements constituted by the neighboring tilted plates. Our results provide the important clues for investigating the mechanism of laning formation in driven system.

关键词： driven system tilted plates laning phase drifting behavior