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Microbial self-healing of cracks in cement-based materials and its influencing factors

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Frontiers of Structural and Civil Engineering 2023年第11期17卷 1630-1642页

作者： Xiaoniu yu Qiyong ZHANG xuan ZHANG Mian LUO Jiangsu Key Laboratory of Construction Materials Southeast UniversityNanjing 211189China College of Engineering and Technology Southwest UniversityChongqing 400715China School of Civil Engineering and Architecture Jiangsu University of Science and TechnologyZhenjiang 212114China College of Civil Science and Engineering Yangzhou UniversityYangzhou 225127China

Cement-based materials are brittle and crack easily under natural *** can reduce service life because the transport of harmful substances can cause corrosion damage to the *** review discusses the feasibility of using microbial self-healing agents for crack *** and spherical carriers can be used to load microbial self-healing agents and protect microbes,which prolongs the self-healing *** area self-healing ratio,permeability,mechanical strength,precipitation depth method,numerical modeling,and ultrasonic method can be employed to identify the self-healing effect of ***,the self-healing mechanism is systematically *** results showed that microbial self-healing agents can repair cracks in cement-based materials in underground projects and dam *** difficulties and future development of self-healing cracks were analyzed.A microbial selfhealing agent was embedded in the cement-based material,which automatically repaired the developing *** the development of intelligent building materials,self-healing cracks have become the focus of attention.

关键词： cement-based materials cracks microbial self-healing agent mechanism intelligent building materials

Challenges and future directions of secure federated learning:a survey

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Frontiers of Computer Science 2022年第5期16卷 173-180页

作者： Kaiyue ZHANG xuan SONG Chenhan ZHANG Shui yu Department of Computer Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Faculty of Engineering and Information Technology University of Technology SydneySydney 2007Australia SUSTech-UTokyo Joint Research Center on Super Smart City Department of Computer Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Brain-inspired Intelligent Computation Department of Computer Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Federated learning came into being with the increasing concern of privacy security,as people’s sensitive information is being exposed under the era of big *** is an algorithm that does not collect users’raw data,but aggregates model parameters from each client and therefore protects user’s ***,due to the inherent distributed nature of federated learning,it is more vulnerable under attacks since users may upload malicious data to break down the federated learning *** addition,some recent studies have shown that attackers can recover information merely from ***,there is still lots of room to improve the current federated learning *** this survey,we give a brief review of the state-of-the-art federated learning techniques and detailedly discuss the improvement of federated *** open issues and existing solutions in federated learning are *** also point out the future research directions of federated learning.

关键词： federated learning privacy protection security

An Improved Polar Codes-Based Key Reconciliation for Practical Quantum Key Distribution

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Chinese Journal of Electronics 2018年第2期27卷 250-255页

作者： YAN Shiling WANG Jindong fang Junbin JIANG Lin WANG xuan Laboratory of Quantum Engineering and Quantum Materials South China Normal University Department of Optoelectronic Engineering Jinan University The Edward S.Rogers Sr.Department of Electrical & Computer Engineering University of Toronto Harbin Institute of Technology Shenzhen Graduate School

Key reconciliation is important for practical Quantum key distribution（QKD） systems since it corrects the error bits in a key string by sacrificing some key bits. Therefore, its performance directly affects the secret key rate of a practical QKD system. Although key reconciliation scheme based on polar codes can achieve a high coding efficiency, the high frame error rate causes discarding key strings and decreases the secret key rate. In this paper, we fist analyze the limitation of successive cancellation decoding of polar codes, and then we propose an improved key reconciliation scheme using polar codes with successive cancellation list decoding and optimized coding structures, which can decrease the frame error probability, resulting in a higher secret key rate. Numerical results show that the proposed scheme can achieve a 12.8% higher secret key rate than the previous polar codes-based scheme with a code length of 216 bits and a quantum bit error rate of 2%. Besides, the proposed scheme is robust and it can extract secret key bits even when the quantum bit error rate reaches 10.2% with a code length of 2;bits and a coding efficiency of 90.6%.

关键词： Quantum key distribution Polar codes Successive cancellation list decoding Secret key rate

Comprehensive review of targeted therapy for colorectal cancer

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Signal Transduction and Targeted Therapy 2020年第1期5卷 2155-2184页

作者： yuan-Hong Xie Ying-xuan Chen Jing-yuan fang Division of Gastroenterology and Hepatology Shanghai Institute of Digestive DiseaseState Key Laboratory for Oncogenes and Related GenesKey Laboratory of Gastroenterology&HepatologyMinistry of HealthRenji HospitalSchool of MedicineShanghai Jiao Tong University145 Middle Shandong Road200001 ShanghaiChina

Colorectal cancer(CRC)is among the most lethal and prevalent malignancies in the world and was responsible for nearly 881,000 cancer-related deaths in *** and chemotherapy have long been the first choices for cancer ***,the prognosis of CRC has never been satisfying,especially for patients with metastatic *** therapy is a new optional approach that has successfully prolonged overall survival for CRC *** successes with the anti-EGFR(epidermal growth factor receptor)agent cetuximab and the anti-angiogenesis agent bevacizumab,new agents blocking different critical pathways as well as immune checkpoints are emerging at an unprecedented *** worldwide are currently updating the recommended targeted drugs on the basis of the increasing number of high-quality clinical *** review provides an overview of existing CRC-targeted agents and their underlying mechanisms,as well as a discussion of their limitations and future trends.

关键词： Surgery drugs chemotherapy

A United Framework for Large-Scale Resource Description Framework Stream Processing

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Journal of Computer Science & Technology 2019年第4期34卷 762-774页

作者： Hong fang Bo Zhao Xiao-Wang Zhang xuan-Xing Yang College of Arts and Sciences Shanghai Polytechnic UniversityShanghai 201209China College of Intelligence and Computing Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Cognitive Computing and Application Tianjin 300350China

Resource description framework(RDF)stream is useful to model spatio-temporal *** this paper,we propose a framework for large-scale RDF stream processing,LRSP,to process general continuous queries over large-scale RDF ***,we propose a formalization(named CT-SPARQL)to represent the general continuous queries in a unified,unambiguous ***,based on our formalization we propose LRSP to process continuous queries in a common white-box way by separating RDF stream processing,query parsing,and query ***,we implement and evaluate LRSP with those popular continuous query engines on some benchmark datasets and real-world *** to the architecture of LRSP,many efficient query engines(including centralized and distributed engines)for RDF can be directly employed to process continuous *** experimental results show that LRSP has a higher performance,specially,in processing large-scale real-world data.

关键词： resource description framework(RDF)stream continuous query united framework stream processing large-scale RDF stream processing(LRSP)

On the non-local priors for sparsity selection in high-dimensional Gaussian DAG models

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Statistical Theory and Related Fields 2021年第4期5卷 332-345页

作者： xuan Cao fang Yang Division of Statistics and Data Science Department of Mathematical SciencesUniversity of CincinnatiCincinnatiOHUSA

We consider sparsity selection for the Cholesky factor L of the inverse covariance matrix in high-dimensional Gaussian DAG *** sparsity is induced over the space of L via non-local priors,namely the product moment(pMOM)prior[Johnson,V.,&Rossell,D.(2012).Bayesian model selection in high-dimensional *** of the American Statistical Asso-ciation,107(498),***://***/10.1080/01621459.2012.682536]and the hierarchi-cal hyper-pMOM prior[Cao,X.,Khare,K.,&Ghosh,M.(2020).High-dimensional posterior consistency for hierarchical non-local priors in *** Analysis,15(1),***://***/10.1214/19-BA1154].We establish model selection consistency for Cholesky fac-tor under more relaxed conditions compared to those in the literature and implement an efficient MCMC algorithm for parallel selecting the sparsity pattern for each column of *** demonstrate the validity of our theoretical results via numerical simulations,and also use further simulations to demonstrate that our sparsity selection approach is competitive with existing methods.

关键词： Bayesian DAG models non-local priors high-dimensional data posterior consistency graph selection

Differentially Private Event Histogram Publication on Sequences overGraphs

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Journal of Computer Science & Technology 2017年第5期32卷 1008-1024页

作者： Ning Wang yu Gu Jia Xu fang-fang Li Ge yu College of Computer Science and Engineering Northeastern University Shenyang 110819 China College of Computer Electronics and Information Guangxi University Nanning 530004 China

The big data era is coming with strong and ever-growing demands on analyzing personal information and footprints in the cyber world. To enable such analysis without privacy leak risk, differential privacy (DP) has been quickly rising in recent years, as the first practical privacy protection model with rigorous theoretical guarantee. This paper discusses how to publish differentially private histograms on events in time series domain, with sequences of personal events over graphs with events as edges. Such individual-generated sequences commonly appear in formalized industrial workflows, online game logs, and spatial-temporal trajectories. Directly publishing the statistics of sequences may compromise personal privacy. While existing DP mechanisms mainly target at normalized domains with fixed and aligned dimensions, our problem raises new challenges when the sequences could follow arbitrary paths on the graph. To tackle the problem, we reformulate the problem with a three-step framework, which 1) carefully truncates the original sequences, trading off errors introduced by the truncation with those introduced by the noise added to guarantee privacy, 2) decomposes the event graph into path sub-domains based on a group of event pivots, and 3) employs a deeply optimized tree-based histogram construction approach for each sub-domain to benefit with less noise addition. We present a careful analysis on our framework to support thorough optimizations over each step of the framework, and verify the huge improvements of our proposals over state-of-the-art solutions.

关键词： differential privacy histogram publication sequence graph

Pt–C interactions in carbon-supported Pt-based electrocatalysts

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1677-1697页

作者： yu-xuan Xiao Jie Ying Hong-Wei Liu Xiao-yu Yang School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology(Qingdao) Wuhan University of TechnologyWuhan 430070China

Carbon-supported Pt-based materials are highly promising *** carbon support plays an important role in the Pt-based catalysts by remarkably influencing the growth,particle size,morphology,dispersion,electronic structure,physiochemical property and function of *** review summarizes recent progress made in the development of carbon-supported Pt-based catalysts,with special emphasis being given to how activity and stability enhancements are related to Pt–C interactions in various carbon supports,including porous carbon,heteroatom doped carbon,carbon-based binary support,and their corresponding electrocatalytic ***,the current challenges and future prospects in the development of carbon-supported Pt-based catalysts are discussed.

关键词： Pt-C interactions Pt-based materials carbon support electrocatalysis

STRUCTURE AND RESTRUCTURING OF BEIJING-TIANJIN-HEBEI MEGALOPOLIS IN CHINA

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Chinese Geographical Science 2006年第1期16卷 1-8页

作者： yu Tao-fang School of Architecture Tsinghua University Beijing 100084 P. R. China

Scott proposes to use the term global city-regions to designate the phenomena that bear some resemblance to the "world cities" firstly identified by Hall and Friedmann and Wolff, and to the "global cities" of Sassen but whose essential social logic and contextual characteristics have evolved considerably since these pioneering studies were published. In simple geographical terms, a global city-region can be refered to comprise any major metropolitan area or any contiguous set of metropolitan areas together with a surrounding hinterland of variable extent-itself a locus of scattered urban settlements-whose internal economic and political affairs are bound up in intricate ways in intensifying and far-flung extra-national relationships. Scott refers to these extra-national relationships as a symptom of "globalization". As economic motors and political actors, the global city regions have been regarded as crucial parts of development strategies in China. In the "Eleventh Five-year Plan" issued by the National Development and Reform Commission of P. R. China, the Beijing-Tianjin-Hebei Province (Jing-Jin-Ji) region, one of the typical megalopolises or global city regions in the East Coastal China is paid more attention. This paper first analyzes the regional structure of the Jing-Jin-Ji region based on data of the fifth national population census of China. And then through the changes of the population growth, the dynamic process and mechanisms of the regional restructuring in the Jing-Jin-Ji is explored and discussed.

关键词： regional structure regional restructuring Beijing-Tianjin-Hebei (Jing-Jin-Ji)