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Frontiers of Structural and Civil Engineering 2024年第1期18卷 14-29页

作者： Jing XU xianzhi wang Wu YAO Anna A.KULMINSKAYA Surendra P.SHAH Key Laboratory of Advanced Civil Engineering Materials(Ministry of Education) School of Materials Science and EngineeringTongji UniversityShanghai 201804China Petersburg Nuclear Physics Institute Named by B.P.Konstantinov of National Research Centre Kurchatov InstituteGatchina 188300Russia Center for Advanced Construction Materials University of Texas at ArlingtonArlingtonTX 76019USA

Microbially induced carbonate precipitation(MICP)is a promising technique for the autonomous healing of concrete cracks.In this study,the effect of pH on MICP was investigated.The results indicate that the MICP process was inhibited when the pH was higher than 11.Both vaterite and calcite were produced when the pH was8.Recycled concrete aggregates(RCA)coated with sodium silicate have been proposed as protective carriers for microbial healing agents.Although the presence of the coated RCA resulted in a loss of the splitting tension strength of the concrete,the loaded healing agents were highly efficient in self-healing cracks.Concrete incorporated with 20%RCA loaded with healing agents exhibited the best self-healing performance.When the initial crack widths were between 0.3 and 0.4 mm,the 7-d mean healing rate was approximately 90%.At 28 d,the crack area filling ratio was 86.4%,while its water tightness recovery ratio was 74.4%and 29.8%,respectively,for rapid and slow absorption.This study suggests that RCA coated with sodium silicate is an effective method for packaging microbial healing agents and has great potential for developing cost-effective self-healing concrete.

关键词： self-healing microbial-induced carbonate precipitation water uptake recycled concrete aggregate protective carrier

A Design of 220 kV Line Protection Action Deduction System Based on Numerical Simulation

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Energy Engineering 2022年第5期119卷 2105-2134页

作者： Tiecheng Li Qingquan Liu Hui Fan xianzhi wang Daming Zhou Junan Guo Lee Li Kun Zhou Yujie Hu State Grid Hebei Electrical Power Company Research Institute Shijiazhuang050021China State Grid Hebei Electrical Power Company Shijiazhuang050021China Wuhan Kemov Electric Co. Ltd.Wuhan430223China

Accurate conditions monitoring and early wrong action warnings of relay protection in the Smart Substation is the basic guarantee to realize the normal operation of primary and secondary system of the power grid.At present,the traditional operation and maintenance monitoring methods of relay protections have poor timeliness,while some automatic monitoring methods have insufficient early warning performance,and lack the online action deduction function independent of the actual device.In this paper,a design method of integrated action deduction system including protection logic reasoning and software and hardware operation condition is proposed.The system can receive real-time operation information of protection online,simulate different types of faults,and output the recording information of sub modules belongs to the action deduction system.It can realize the online monitoring of device faults such as deducing the correctness of setting values at a certain time in the future,giving the wrong action warnings and predicting the probability of them as well,which effectively improves the operation and maintenance efficiency of the secondary system in the intelligent substation.

关键词： Intelligent substation numerical simulation relay protection conditions monitoring wrong action warning

Rotating machinery fault diagnosis based on convolutional neural network and infrared thermal imaging

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Chinese Journal of Aeronautics 2020年第2期33卷 427-438页

作者： Yongbo LI Xiaoqiang DU Fangyi WAN xianzhi wang Huangchao YU MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Institute of Unmanned System National University of Defense TechnologyChangsha 410073China

Rotating machinery is widely applied in industrial applications.Fault diagnosis of rotating machinery is vital in manufacturing system,which can prevent catastrophic failure and reduce financial losses.Recently,Deep Learning(DL)-based fault diagnosis method becomes a hot topic.Convolutional Neural Network(CNN)is an effective DL method to extract the features of raw data automatically.This paper develops a fault diagnosis method using CNN for InfRared Thermal(IRT)image.First,IRT technique is utilized to capture the IRT images of rotating machinery.Second,the CNN is applied to extract fault features from the IRT images.In the end,the obtained features are fed into the Softmax Regression(SR)classifier for fault pattern identification.The effectiveness of the proposed method is validated using two different experimental data.Results show that the proposed method has a superior performance in identification various faults on rotor and bearings comparing with other deep learning models and traditional vibration-based method.

关键词： Convolutional neural network Feature extraction Infrared thermography(IRT) Intelligent fault diagnosis Rotating machinery

A Survey on Expert Recommendation in Community Question Answering

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Journal of Computer Science & Technology 2018年第4期33卷 625-653页

作者： xianzhi wang Chaoran Huang Lina Yao Boualem Benatallah Manqing Dong School of Software University of Technology Sydney Sydney NSW 2007 Australia School of Computer Science and Engineering University of New South Wales Sydney NSW 2052 Australia

Community question answering （CQA） represents the type of Web applications where people can exchange knowledge via asking and answering questions. One significant challenge of most real-world CQA systems is the lack of effective matching between questions and the potential good answerers, which adversely affects the efficient knowledge acquisition and circulation. On the one hand, a requester might experience many low-quality answers without receiving a quality response in a brief time; on the other hand, an answerer might face numerous new questions without being able to identify the questions of interest quickly. Under this situation, expert recommendation emerges as a promising technique to address the above issues. Instead of passively waiting for users to browse and find their questions of interest, an expert recommendation method raises the attention of users to the appropriate questions actively and promptly. The past few years have witnessed considerable efforts that address the expert recommendation problem from different perspectives. These methods all have their issues that need to be resolved before the advantages of expert recommendation can be fully embraced. In this survey, we first present an overview of the research efforts and state-of-the-art techniques for the expert recommendation in CQA. We next summarize and compare the existing methods concerning their advantages and shortcomings, followed by discussing the open issues and future research directions.

关键词： community question answering expert recommendation challenge solution future direction

DPIF:A Framework for Distinguishing Unintentional Quality Problems From Potential Shilling Attacks

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Computers, Materials & Continua 2019年第4期59卷 331-344页

作者： Mohan Li Yanbin Sun Shen Su Zhihong Tian Yuhang wang xianzhi wang Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China School of Software University of Technology SydneySydneyAustralia

Maliciously manufactured user profiles are often generated in batch for shilling attacks.These profiles may bring in a lot of quality problems but not worthy to be repaired.Since repairing data always be expensive,we need to scrutinize the data and pick out the data that really deserves to be repaired.In this paper,we focus on how to distinguish the unintentional data quality problems from the batch generated fake users for shilling attacks.A two-steps framework named DPIF is proposed for the distinguishment.Based on the framework,the metrics of homology and suspicious degree are proposed.The homology can be used to represent both the similarities of text and the data quality problems contained by different profiles.The suspicious degree can be used to identify potential attacks.The experiments on real-life data verified that the proposed framework and the corresponding metrics are effective.

关键词： Data quality shilling attacks functional dependency suspicious degree homology

Location Privacy in Device-Dependent Location-Based Services:Challenges and Solution

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Computers, Materials & Continua 2019年第6期59卷 983-993页

作者： Yuhang wang Yanbin Sun Shen Su Zhihong Tian Mohan Li Jing Qiu xianzhi wang Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China School of Software University of Technology SydneySydney NSW 2007Australia

With the evolution of location-based services(LBS),a new type of LBS has already gain a lot of attention and implementation,we name this kind of LBS as the Device-Dependent LBS(DLBS).In DLBS,the service provider(SP)will not only send the information according to the user’s location,more significant,he also provides a service device which will be carried by the user.DLBS has been successfully practised in some of the large cities around the world,for example,the shared bicycle in Beijing and London.In this paper,we,for the first time,blow the whistle of the new location privacy challenges caused by DLBS,since the service device is enabled to perform the localization without the permission of the user.To conquer these threats,we design a service architecture along with a credit system between DLBS provider and the user.The credit system tie together the DLBS device usability with the curious behaviour upon user’s location privacy,DLBS provider has to sacrifice their revenue in order to gain extra location information of their device.We make the simulation of our proposed scheme and the result convince its effectiveness.

关键词： Location privacy device-dependent location-based service location-based service credit system location privacy preserving mechanism shared bicycle

Species abundance distributions as a proxy for the niche-neutrality continuum

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Journal of Plant Ecology 2018年第3期11卷 445-452页

作者： xianzhi wang M.D.Farnon Ellwood Dexiecuo Ai Renyi Zhang Gang wang State Key Laboratory of Grassland Agro-Ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou University768 Jiayuguan RoadChengguan DistrictLanzhou730020China Centre for Research in Biosciences University of the West of EnglandColdharbour LaneBristol BS161QYUK State Key Laboratory of Grassland Agro-Ecosystems School of Life SciencesLanzhou University222 Tianshui RoadChengguan DistrictLanzhou730000China

Aims Species abundance distributions(SADs)are often used to verify mechanistic theories underlying community assembly.However,it is now accepted that SADs alone are not sufficient to reveal biological mechanisms.Recent attention focuses on the relative importance of stochastic dispersal processes versus deterministic processes such as interspecific competition and environmental filtering.Here,we combine a study of the commonness and rarity of species(i.***.the SAD)with mechanistic processes underlying community composition.By comparing the occurrence frequen-cies of each and every species with its abundance,we quantify the relative contributions of common and rare species to the maintenance of community structure.Essentially,we relate the continuum between commonness and rarity with that of niches and neutrality.Methods An individual-based,spatially explicit model was used to simu-late local communities in niche spaces with the same parameters.We generated sets of assemblages from which species were elim-inated in opposing sequences:from common to rare and from rare to common,and investigated the relationship between the abundance and frequency of species.We tested the predictions of our model with empirical data from a field experiment in the environmentally homogeneous alpine meadows of the Qinghai-Tibetan plateau.Important Findings Our simulations support the widespread notion that common species maintain community structure,while rare species maintain species diversity,in both local and regional communities.Our results,both from theoretical simulations and from empirical observations,revealed positive correlations between the abundance of a particular species and its occurrence frequency.SAD curves describe a continuum between commonness and rarity.Removing species from the‘rare’end of this continuum has little effect on the similarity of communities,but remov-ing species from the‘common’end of the continuum causes significant increases in beta diversity,or species turnover,between communities.In local communit

关键词： rarity commonness continuum occurrence frequency community similarities

Genome-wide Scan for Seed Composition Provides Insights into Soybean Quality Improvement and the Impacts of Domestication and Breeding

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Molecular Plant 2018年第3期11卷 460-472页

作者： Jiaoping Zhang xianzhi wang Yaming Lu Siddhi J. Bhusal Qijian Song Perry B. Cregan Yang Yen Michael Brown Guo-Liang Jiang Plant Science Department South Dakota State University Brookings SD 57006 USA Soybean Genomics and Improvement Laboratory US Department of Agriculture Agricultural Research Services (USDA-ARS) 10300 Baltimore Avenue BeltsvilleMD 20705 USA Department of Biology and Microbiology South Dakota State University Brookings SD 57006 USA Department of Natural Resource Management South Dakota State University Brookings SD 57006 USA Agricultural Research Station Virginia State University PO Box 9061 Petersburg VA 23806 USA Present address: School of Agriculture Yunnan University Kunming Yunnan Province China These authors contributed equally to this article.

The complex genetic architecture of quality traits has hindered efforts to modify seed nutrients in soybean. Genome-wide association studies were conducted for seed composition, including protein, oil, fatty acids, and amino acids, using 313 diverse soybean germplasm accessions genotyped with a high-density SNP array. A total of 87 chromosomal regions were identified to be associated with seed composition, explain- ing 8%-89% of genetic variances. The candidate genes GmSAT1, AK-HSDH, SACPD-C, and FAD3A of known function, and putative MtN21 nodulin, FATB, and steroid-5-^-reductase involved in N2 fixation, amino acid biosynthesis, and fatty acid metabolism were found at the major-effect loci. Further analysis of additional germplasm accessions indicated that these major-effect loci had been subjected to domes- tication or modern breeding selection, and the allelic variants and distributions were relevant to geographic regions. We also revealed that amino acid concentrations related to seed weight and to total protein had a different genetic basis. This helps uncover the in-depth genetic mechanism of the intricate relationships among the seed compounds. Thus, our study not only provides valuable genes and markers for soybean nutrient improvement, both quantitatively and qualitatively, but also offers insights into the alteration of soybean quality during domestication and breeding.

关键词： genome-wide association study GWAS soybean seed composition candidate genes quality improvement domestication and breeding

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面向视觉障碍者的辅具适配性设计研究

设计 2024年第1期37卷 126-129页

作者：王献志李涵黄群湖北商贸学院艺术与传媒学院湖北工业大学工业设计学院武汉理工大学艺术与设计学院

根据四类视障者的特点和需求,解决其在辅具使用过程中的障碍,增强辅具的适配性,提高辅具的使用价值和利用率。文章采用桌面调研法、用户深度访谈法、个案研究法和归纳法,创新性地提出影响辅具适配性设计的四大因素,并基于四大因素形成... 详细信息

根据四类视障者的特点和需求,解决其在辅具使用过程中的障碍,增强辅具的适配性,提高辅具的使用价值和利用率。文章采用桌面调研法、用户深度访谈法、个案研究法和归纳法,创新性地提出影响辅具适配性设计的四大因素,并基于四大因素形成视觉障碍辅具的适配性设计策略。研究得出单因素设计策略、多场景交互设计策略、多感官交互设计策略、行为记忆设计策略四类,彼此之间可以进行合理搭配。视觉障碍辅具的设计应考虑其在四类视障者之间的适配性,该策略可为视觉障碍辅具的适配性提供理论参考。

关键词：视觉障碍辅具适配性设计策略视觉障碍者影响因素

水泥土搅拌法对河堤基础中粉细砂层处理效果评价

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云南水力发电 2024年第2期40卷 130-133页

作者：黄木根吴丽婷王宪志云南省红河州水利水电勘察设计研究院云南蒙自661100 红河哈尼族彝族自治州水利水电工程地质勘察咨询规划研究院云南蒙自661100

堤防工程基础中存在软弱基础(淤泥质黏土、粉细砂土等),导致设计的建基面开挖过深、施工困难等问题,需要对软弱基础进行处理;通过河口县新街集镇段基础采用水泥搅拌法处理粉细砂层,解决建基面过深、基坑开挖困难、承载力不足等问题,得... 详细信息

堤防工程基础中存在软弱基础(淤泥质黏土、粉细砂土等),导致设计的建基面开挖过深、施工困难等问题,需要对软弱基础进行处理;通过河口县新街集镇段基础采用水泥搅拌法处理粉细砂层,解决建基面过深、基坑开挖困难、承载力不足等问题,得到了较好的效果。

关键词：堤防设计粉细砂基础处理水泥土搅拌法