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Method development for estimating soil organic carbon content in an alpine region using soil moisture data

Science China Earth Sciences 2020年第4期63卷 591-601页

作者： qi luo Kun YANG Yingying CHEN Xu ZHOU Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Earth System Science Tsinghua UniversityBeijing 100084China CAS Center for Excellence in Tibetan Plateau Earth System Beijing 100101China

The high soil organic carbon(SOC) content in alpine meadow can significantly change soil hydrothermal properties and further affect the soil temperature and moisture as well as the surface water and energy budget. Therefore, this study first introduces a parameterization scheme to describe the effect of SOC content on soil hydraulic and thermal parameters in a land surface model(LSM), and then the SOC content is estimated by minimizing the difference between observed and simulated surface-layer soil moisture. The accuracy of the estimated SOC content was evaluated using in situ observation data at a soil moisture and temperature-measuring network in Naqu, central Tibetan Plateau. Sensitivity experiments show that the optimum time window for stabilizing the estimation results cannot be shorter than three years. In the experimental area, the estimated SOC content can generally reflect the spatial distribution of the measurements, with a root mean square error of 0.099 m^3 m^(-3), a mean bias of 0.043 m^3 m^(-3), and a correlation coefficient of 0.695. The estimated SOC content is not sensitive to the temporal frequency of the soil moisture data input. Even if the temporal frequency is as low as that of current soil moisture products derived from passive microwave satellites, the estimation result is still stable. Therefore, by combining a high-quality satellite soil moisture product and a parameter optimization method, it is possible to obtain grid-scale effective parameter values, such as SOC content,for an LSM and improve the simulation ability of the LSM.

关键词： Land surface model Soil organic carbon content Soil porosity Soil parameter estimation

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Simulation of a class of delay stochastic system with distributed parameter

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Journal of Systems Engineering and Electronics 2005年第4期16卷 843-846页

作者： Song Yanan Deng Feiqi luo qi Coll. of Automation Science and Engineering South China Univ. of Technology Guangzhou 510640 P. R. China

Simulation of a class of delay stochastic system with distributed parameter is discussed. Difference schemes for the numerical computation of delay stochastic system are obtained. The precision of the difference scheme and the efficiency of the difference scheme in simulation of delay stochastic system with distributed parameter are analyzed. Examples are given to illustrate the application of the method.

关键词： simulation distributed parameter delay stochastic system.

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Periostin： a potent chemotactic factor for recruiting tumor-associated macrophag

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Protein & Cell 2015年第4期6卷 235-237页

作者： Tiantian Wu qi luo Gaoliang Ouyang State Key Laboratory of Cellular Stress Biology Innovation Center for Cell Signaling Network School of Life Sciences Xiamen University Xiamen 361102 China Department of Surgical Oncology First Affiliated Hospital of Xiamen University Xiamen 361003 China

Glioblastoma （GBM） is the most common malignant primary brain tumor with a low five-year survival rate. Evidence from experimental and clinical studies indicates that glioma stem cells （GSCs） contribute to GBM tumor growth, therapeutic resistance and relapse （Bao et al., 2006; Gilbertson and Rich, 2007）. GSCs are enriched in a unique microenviron- ment known as the perivascular niche. Interestingly, a large number of tumor-associated macrophages （TAMs） are also distributed in the perivascular niche, indicating that crosstalk between GSCs and TAMs may have a critical role in GBM tumor progression. TAMs are abundant in most solid tumors and contribute to tumor progression in several ways, such as promoting invasion, angiogenesis and immunosuppression; however, the molecular link between TAM recruitment and GSCs has remained generally unclear. Writing in Nature Cell Biology, Zhou et al. provide new insights into where and how TAMs are recruited and educated by GSCs in GBMs （Zhou et al., 2015）（Fig. 1）.

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Core Decomposition and Maintenance in Bipartite Graphs

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Tsinghua Science and Technology 2023年第2期28卷 292-309页

作者： Dongxiao Yu Lifang Zhang qi luo Xiuzhen Cheng Zhipeng Cai School of Computer Science and Technology Shandong UniversityQingdao 266237China Department of Computer Science Georgia State UniversityAtlantaGA 30303USA

The prevalence of graph data has brought a lot of attention to cohesive and dense subgraph *** contrast with the large number of indexes proposed to help mine dense subgraphs in general graphs,only very few indexes are proposed for the same in bipartite *** this work,we present the index called˛.ˇ/-core number on vertices,which reflects the maximal cohesive and dense subgraph a vertex can be in,to help enumerate the(α,β)-cores,a commonly used dense structure in bipartite *** address the problem of extremely high time and space cost for enumerating the(α,β)-cores,we first present a linear time and space algorithm for computing the˛.ˇ/-core numbers of *** further propose core maintenance algorithms,to update the core numbers of vertices when a graph changes by avoiding *** results on different real-world and synthetic datasets demonstrate the effectiveness and efficiency of our algorithms.

关键词： core decomposition core maintenance bipartite graph dense subgraph mining

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Brominated Butyl Rubber Anticorrosive Coating and its Self-healing Behaviors

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Chinese Journal of Polymer Science 2023年第2期41卷 297-305页

作者： Guang-Bing luo Bo Pang Xing-qi luo Yi Wang Hong Zhou Li-Juan Zhao College of Chemistry and Materials Science Sichuan Normal UniversityChengdu610066China The Second Research Institute of Civil Aviation Administration of China(CAAC) Chengdu610041China

Self-healing anticorrosive coatings in extreme environment have attracted considerable interest from *** this work,4-tert-butylpyridine(TBP)was incorporated into brominated butyl rubber(BIIR)polymer networks to form a reversible ionic bond with the highly reactive bromine *** on the low glass transition temperature of the BIIR polymer and the electrostatic effects,a robust self-healing anticorrosive coating of TBP-BIIR was ***-BIIR coating showed a maximum protection efficiency(PE)of more than 94%(TBP-BIIR-acid,94.37%;TBP-BIIR-alkali,94.95%;TBP-BIIR-salt,95.49%)when treated with a strong acid(HNO_(3),pH=2),strong base(NaOH,pH=12)and high salt solution(3.5 wt%NaCl).In addition,the PE of coating repaired exceed 89%,and the maximum PE value was approximately 95%in different solutions,which demonstrated its extinguished self-healing *** results indicated that the TBP-BIIR anticorrosive coating could provide excellent safety and durability in special environment,which would be extremely beneficial to improve the working life of metal parts used in aviation and shipping,oil and gas and related industries.

关键词： Brominated butyl rubber Self-healing Anticorrosive Coating

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Stability and Stabilization on Generalized Delay Stochastic Neural Network with Distributed Parameter

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Wuhan University Journal of Natural Sciences 2005年第5期10卷 823-827页

作者： luo qi DENG Fei-qi BAO Jun-dong College of Science Wuhan University of Science and Technology Wuhan 430081 Hubei China Institute of Automatic Science and Control Engineering South China University of Technology Guangzhou 510640Guangdong China Department of Mathematics Inner Mongolia Normal University Huhhot 010022 Inner Mongolia China

Inner stability and stabilization of Cohen-Grossberg generalized delay stochastic neural network with distributed parameter are discussed. The main method adopted is, combining inequality techniques, to apply Ito differential formula to the constructed average function with respect to spatial variables along the system considered under the integral operator. Some sufficient conditions are given.

关键词： distributed parameter generalized delay stochastic neural network stability and stabilization

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Universal Image Steganalysis Based on Convolutional Neural Network with Global Covariance Pooling

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Journal of Computer Science & Technology 2022年第5期37卷 1134-1145页

作者： Xiao-qing Deng Bo-Lin Chen Wei-qi luo Da luo Guangdong Key Laboratory of Information Security Technology Sun Yat-sen UniversityGuangzhou 510006China School of Cyberspace Security Dongguan University of TechnologyDongguan 523808China

Recently,steganalytic methods based on deep learning have achieved much better performance than traditional methods based on handcrafted ***,most existing methods based on deep learning are specially designed for one image domain(i.e.,spatial or JPEG),and they often take long time to *** make a balance between the detection performance and the training time,in this paper,we propose an effective and relatively fast steganalytic network called US-CovNet(Universal Steganalytic Covariance Network)for both{the}spatial and JPEG *** this end,we carefully design several important components of{US-CovNet}that will significantly affect the detection performance,including the high-pass filter set,the shortcut connection and the pooling{layer}.Extensive experimental results show that compared with the current best steganalytic networks(i.e.,SRNet and J-YeNet),{US-CovNet}can achieve the state-of-the-art results for detecting spatial steganography and have competitive performance for detecting JPEG *** example,the detection accuracy of US-CovNet is at least 0.56%higher than that of SRNet in the spatial *** the JPEG domain,US-CovNet performs slightly worse than J-YeNet in some cases with the degradation of less than 0.78%.However,the training time of US-CovNet is significantly reduced,which is less than 1/4 and 1/2 of SRNet and J-YeNet respectively.

关键词： steganalysis steganography convolutional neural networks global covariance pooling

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Inverse Method of Centrifugal Pump Impeller Based on Proper Orthogonal Decomposition (POD) Method

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Chinese Journal of Mechanical Engineering 2017年第4期30卷 1025-1031页

作者： Ren-Hui Zhang Rong Guo Jun-Hu Yang Jia-qi luo School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Fluid Machinery and Systems Lanzhou 730050GansuChina College of Engineering Peking UniversityBeijing 100871China

To improve the accuracy and reduce the calcu- lation cost for the inverse problem of centrifugal pump impeller, the new inverse method based on proper orthog- onal decomposition （POD） is proposed. The pump blade shape is parameterized by quartic Bezier curve, and the initial snapshots is generated by introducing the perturbation of the blade shape control parameters. The internal flow field and its hydraulic performance is predicted by CFD method. The snapshots vector includes the blade shape parameter and the distribution of blade load. The POD basis for the snap- shots set are deduced by proper orthogonal decomposition. The sample vector set is expressed in terms of the linear combination of the orthogonal basis. The objective blade shape corresponding to the objective distribution of blade load is obtained by least square fit. The Iterative correction algorithm for the centrifugal pump blade inverse method based on POD is proposed. The objective blade load dis- tributions are corrected according to the difference of the CFD result and the POD result. The two dimensional and three dimensional blade calculation cases show that the proposed centrifugal pump blade inverse method based on POD have good convergence and high accuracy, and thecalculation cost is greatly reduced. After two iterations, the deviation of the blade load and the pump hydraulic perfor- mance are limited within 4.0% and 6.0% individually for most of the flow rate range. This paper provides a promising inverse method for centrifugal pump impeller, which will benefit the hydraulic optimization of centrifugal pump.

关键词： Centrifugal impeller Proper orthogonaldecomposition Inverse method Snapshot sets

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Solute carrier transporters: the metabolic gatekeepers of immune cells

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Acta Pharmaceutica Sinica B 2020年第1期10卷 61-78页

作者： Wenxin Song Danyuan Li Lei Tao qi luo Ligong Chen School of Pharmaceutical Sciences Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education)Tsinghua UniversityBeijing 100084China Advanced Innovation Center for Human Brain Protection Capital Medical UniversityBeijing 100088China Collaborative Innovation Center for Biotherapy State Key Laboratory of Biotherapy and Cancer CenterWest China HospitalWest China Medical SchoolSichuan UniversityChengdu 610065China

Solute carrier(SLC)transporters meditate many essential physiological functions,including nutrient uptake,ion influx/efflux,and waste *** its protective role against tumors and infections,the mammalian immune system coordinates complex signals to support the proliferation,differentiation,and effector function of individual cell *** research in this area has yielded surprisingfindings on the roles of solute carrier transporters,which were discovered to regulate lymphocyte signaling and control their differentiation,function,and fate by modulating diverse metabolic pathways and balanced levels of different *** this review,we present current information mainly on glucose transporters,amino-acid transporters,and metal ion transporters,which are critically important for mediating immune cell homeostasis in many different pathological conditions.

关键词： Solute carrier Lymphocytes Glucose Glutamine Metalion

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Study of ATP borate ester effects on cell sensitization to radiation emitted by a nuclear reactor

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Nuclear Science and Techniques 2020年第1期31卷 13-25页

作者： Miao Wang Yong-Peng Tong qi luo Shi-Peng Hu College of Physics and Optoelectronic Engineering Shenzhen University

Adenosine triphosphate(ATP)borate ester as a new boron agent for boron neutron capture therapy was *** was synthesized via a dehydration reaction induced by heating adenosine triphosphate disodium with boric ***,ATP borate ester pretreatments were assessed to study their effects on cell sensitization from exposure to thermal neutron irradiation emitted by a nuclear *** cell viability assays(CCK8),survival rates of A549 cells pretreated with or without boroncontaining agents,including ATP borate ester and 4-dihydroxyborylphenylalanine(BPA),were *** week after feeding an ATP borate ester solution to tumorbearing nude mice,elemental B content values of tumor muscle and blood were measured using inductively coupled plasma mass spectrometry(ICP-MS).Meanwhile,other tumor tissue samples were placed in a culture medium,subjected to a 3-min neutron irradiation exposure,and then fixed in formalin 24 h later for the terminaldeoxynucleotidyl transferase(TDT)-mediated d UTP nick end labeling(TUNEL)immunohistochemical staining *** showed that A549 cell irradiation sensitization(irradiation dose of 0.33 Gy)varied with *** values of the ATP borate ester pretreatment group were 1.3–14.1 with boron agent concentrations of 0.3–4.5 *** 1.1–3.4 mM,ATP borate ester showed significantly higher sensitization values than ***,TUNEL results demonstrated that apoptosis rates of tumor tissue cells exposed to irradiation after ATP borate ester pretreatment significantly exceeded the corresponding rates for BPA-pretreated *** animal experiments,although the distribution ratio of ATP borate ester(tumor tissue/normal muscle,T/N)of 1.2 was not significantly different compared with that of BPA(1.3),the total ATP borate ester concentration in the tumor tissue(0.79±0.05μg/g)significantly exceeded that of BPA(0.58±0.05μg/g).Thus,compared with BPA,the greater enrichment of ATP borate ester in tumor tissues permits pre

关键词： ATP borate ester Boron agent Neutron radiation Sensitizing effect A549 cell lines

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