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A hybrid artificial bee colony algorithm and support vector machine for predicting blast-induced ground vibration

Earthquake Engineering and Engineering Vibration 2022年第4期21卷 861-876页

作者： Zhu Chun Xu Yingze Wu Yongxin He Manchao Zhu Chuanqi meng qingxiang Lin Yun School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining andTechnology(Beijing)Beijing 100083China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines AnhuiUniversity of Science and TechnologyHuainan 232001China College of Petroleum Engineering Xi’an Shiyou UniversityXi’an 710065China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Because nearby construction has harmful effects,precisely predicting blast-induced ground vibration is *** this paper,a hybrid artificial bee colony(ABC)and support vector machine(SVM)model was proposed for predicting the value of peak particle velocity(PPV),which is used to describe blast-induced ground *** construct the model,5 potentially relevant factors,including controllable and uncontrollable parameters,were considered as input parameters,and PPV was set as the output ***-five samples were recorded from the Hongling lead-zinc *** ABC-SVM model was developed and trained on 35 samples via 5-fold cross-validation(CV).A testing set(10 samples)was used to evaluate the prediction performance of the ABC-SVM *** and four empirical models(United States Bureau of Mines(USBM),Amraseys-Hendron(A-H),Langefors-Kihstrom(L-K),and Central Mining Research Institute(CMRI))also were introduced for ***,the performances of the models were analyzed by using 3 statistical parameters:the correlation coefficient(R2),root-mean-square error(RMSE),and variance accounted for(VAF).ABC-SVM had the highest R2 and VAF values followed by the SVM,A-H,USBM,CMRI,and L-K *** results demonstrated that ABC-SVM outperformed SVM and the empirical predictors for predicting ***,the best results from the R2,RMSE,and VAF indices were 0.9628,0.2737,and 96.05%for the ABC-SVM *** sensitivities of the parameters also were investigated,and the height difference between the blast point and the monitoring station was found to be the parameter that had the most influence on PPV.

关键词： recycled concrete frame-shear wall concealed bracings shaking table test nonlinear time-history response analysis

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Fracture of two three-dimensional parallel internal cracks in brittle solid under ultrasonic fracturing

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 757-769页

作者： Haijun Wang Hanzhang Li Lei Tang Xuhua Ren qingxiang meng Chun Zhu State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing210029China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China

Similar to hydraulic fracturing(HF), the coalescence and fracture of cracks are induced within a rock under the action of an ultrasonic field, known as ultrasonic fracturing(UF). Investigating UF is important in both hard rock drilling and oil and gas recovery. A three-dimensional internal laser-engraved crack(3D-ILC) method was introduced to prefabricate two parallel internal cracks within the samples without any damage to the surface. The samples were subjected to UF. The mechanism of UF was elucidated by analyzing the characteristics of fracture surfaces. The crack propagation path under different ultrasonic parameters was obtained by numerical simulation based on the Paris fatigue model and compared to the experimental results of UF. The results show that the 3D-ILC method is a powerful tool for UF *** the action of an ultrasonic field, the fracture surface shows the characteristics of beach marks and contains powder locally, indicating that the UF mechanism includes high-cycle fatigue fracture, shear and friction, and temperature load. The two internal cracks become close under UF. The numerical result obtained by the Paris fatigue model also shows the attraction of the two cracks, consistent with the test results. The 3D-ILC method provides a new tool for the experimental study of UF. Compared to the conventional numerical methods based on the analysis of stress-strain and plastic zone, numerical simulation can be a good alternative method to obtain the crack path under UF.

关键词： Three-dimensional internal laser-engraved crack(3D-ILC) Interaction of cracks Ultrasonic fatigue Penny-shaped crack Fracture mechanics High-cycle fatigue

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RB-DEM Modeling and Simulation of Non-Persisting Rough Open Joints Based on the IFS-Enhanced Method

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 337-359页

作者： Hangtian Song Xudong Chen Chun Zhu Qian Yin Wei Wang qingxiang meng Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China Research Institute of Geotechnical Engineering Hohai UniversityNanjing210098China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China

When the geological environment of rock masses is disturbed,numerous non-persisting open joints can appear within *** is crucial to investigate the effect of open joints on the mechanical properties of rock ***,it has been challenging to generate realistic open joints in traditional experimental tests and numerical *** paper presents a novel solution to solve the *** utilizing the stochastic distribution of joints and an enhanced-fractal interpolation system(IFS)method,rough curves with any orientation can be *** Douglas-Peucker algorithm is then applied to simplify these curves by removing unnecessary points while preserving their fundamental ***,open joints are created by connecting points that move to both sides of rough curves based on the aperture *** modeling is performed to construct the final mesh ***,the RB-DEM method is applied to transform the mesh model into a discrete element model containing geometric information about these open ***,this study explores the impacts of rough open joint orientation,aperture,and number on rock fracture *** method provides a realistic and effective approach for modeling and simulating these non-persisting open joints.

关键词： Non-persisting rough open joints stochastic distribution of joints enhanced-IFS method RB-DEM

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Toward Interoperable Multi‑hazard Modeling: A Disaster Management System for Disaster Model Service Chain

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International Journal of Disaster Risk Science 2022年第6期13卷 862-877页

作者： Wenyu Jiang Fei Wang Xiaocui Zheng Xinxin Zheng Xiaohui Qiao Xin Li qingxiang meng Department of Engineering Physics Tsinghua UniversityBeijing 100084China Institute of Safety Science and Technology Tsinghua Shenzhen International Graduate SchoolShenzhen 518000China Food and Resource Economics Department University of FloridaGainesvilleFL 32611USA Foshan Urban Safety Research Center Foshan 528000China School of Remote Sensing and Information Engineering Wuhan UniversityWuhan 430000China

A natural hazard-related disaster event often causes a series of secondary disasters, forming a disaster chain. Modeling the evolution of disaster chains in multihazard scenarios is crucial for risk governance and urban resilience. However, existing multi-hazard models are limited by complex model design and fixed disaster types, making it impossible to ensure flexible reactions to complex and diverse scenarios. This study presents a disaster management system for disaster model service chain(DMSC) to implement interoperable multi-hazard modeling. To achieve efficient model interaction in the DMSC, a management module is designed to normalize heterogeneous single-hazard models based on disaster system theory and the Open Geospatial Consortium standards, enabling them to be accessible,reusable, and interoperable. The normalized models are then adaptively orchestrated through an orchestration module to establish optimal executable DMSCs for different multihazard scenarios. Taking an earthquake disaster chain as a case study, we demonstrate that the disaster management system shows stable and flexible performance for multihazard modeling.

关键词： Disaster management Disaster chain Model interoperability Multi-hazard modeling Service orchestration

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A Novel Hybrid Intelligent Prediction Model for Valley Deformation: A Case Study in Xiluodu Reservoir Region, China

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Computers, Materials & Continua 2021年第1期66卷 1057-1074页

作者： mengcheng Sun Weiya Xu Huanling Wang qingxiang meng Long Yan Wei-Chau Xie Research Institute of Geotechnical Engineering Hohai UniversityNanjing210098China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China Key Laboratory of Coastal Disaster and Defense Ministry of EducationHohai UniversityNanjing210098China Department of Civil and Environmental Engineering University of WaterlooWaterlooN2L 3G1Canada

The narrowing deformation of reservoir valley during the initial operation period threatens the long-term safety of the dam,and an accurate prediction of valley deformation(VD)remains a challenging part of risk *** order to enhance the accuracy of VD prediction,a novel hybrid model combining Ensemble empirical mode decomposition based interval threshold denoising(EEMD-ITD),Differential evolutions—Shuffled frog leaping algorithm(DE-SFLA)and Least squares support vector machine(LSSVM)is *** non-stationary VD series is firstly decomposed into several stationary subseries by EEMD;then,ITD is applied for redundant information denoising on special sub-series,and the denoised deformation is divided into the trend and periodic deformation ***,several relevant triggering factors affecting the VD are considered,from which the input features are extracted by Grey relational analysis(GRA).After that,DE-SFLA-LSSVM is separately performed to predict the trend and periodic deformation with the optimal ***,the two individual forecast components are reconstructed to obtain the final predicted *** VD series monitored in Xiluodu reservoir region are utilized to verify the proposed *** results demonstrate that:(1)Compared with Discrete wavelet transform(DWT),better denoising performance can be achieved by EEMD-ITD;(2)Using GRA to screen the optimal input features can effectively quantify the deformation response relationship to the triggering factors,and reduce the model complexity;(3)The proposed hybrid model in this study displays superior performance on some compared models(e.g.,LSSVM,Backward Propagation neural network(BPNN),and DE-SFLA-BPNN)in terms of forecast accuracy.

关键词： Valley deformation prediction multiple triggering factors DE-SFLALSSVM EEMD-ITD Xiluodu hydropower station

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Effect of Saccharomyces cerevisiae on alfalfa nutrient degradation characteristics and rumen microbial populations of steers fed diets with different concentrate-to-forage ratios

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Journal of Animal Science and Biotechnology 2014年第4期5卷 430-438页

作者： Gengzhi Ding Ying Chang Liping Zhao Zhenming Zhou Liping Ren qingxiang meng State Key Laboratory of Animal Nutrition College of Animal Science and TechnologyChina Agricultural University Lallemand biology Technology(Beijing) Co.Ltd.

Live yeast（Saccharomyces cerevisiae） constitutes an effective additive for animal production;its probiotic effect may be related to the concentrate-to-forage ratio（CTFR）.The objective of this study was to assess the effects of ***（SC） on fiber degradation and rumen microbial populations in steers fed diets with different levels of dietary *** Simmental × Local crossbred steers（450 ± 50 kg BW） were assigned to a control group or an SC *** groups were fed the same basal diet but the SC group received SC supplementation（8 × 10^9 cfu/h/d through the ruminal fistula）following a two-period crossover *** period consisted of four phases,each of which lasted 17 d：10 d for dietary adaptation,6 d for degradation study,and 1 d for rumen sample *** the 1^（st） to the 4^（th） phase,steers were fed in a stepwise fashion with increasing CTFRs,i.e.,30：70,50：50,70：30,and 90：*** kinetics of dry matter and fiber degradation of alfalfa pellets were evaluated;the rumen microbial populations were detected using real-time *** results revealed no significant（P〉 0.05） interactions between dietary CTFR and SC for most *** CTFR had a significant effect（P〈 0.01） on degradation characteristics of alfalfa pellets and the copies of rumen microorganism;the increasing concentrate level resulted in linear,quadratic or cubic variation trend for these *** supplementation significantly（P〈 0.05） affected dry matter（DM） and neutral detergent fiber（NDF）degradation rates（c_（DM）,c_（NDF）） and NDF effective degradability（ED_（NDF））.Compared with the control group,there was an increasing trend of rumen fungi and protozoa in SC group（P 〈 0.1）;copies of total bacteria in SC group were significantly higher（P〈 0.05）.Additionally,percentage of Ruminobacter amylophilus was significantly lower（P〈 0.05）but percentage of Selenomonas ruminantium was significantly higher（P〈 0.05） in the SC *** a word,dietary CTFR had a significant effect on

关键词： Concentrate-to-forage ratios In situ Real-time PCR Rumen microorganism Steers

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Qinghai-tibetan plateau peatland sustainable utilization under anthropogenic disturbances and climate change

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Ecosystem Health and Sustainability 2017年第3期3卷 28-38页

作者： Gang Yang Changhui Peng Huai Chen Faqin Dong Ning Wu Yanzheng Yang Yao Zhang Dan Zhu Yixin He Shengwei Shi Xiaoyang Zeng Tingting Xi qingxiang meng Qiuan Zhu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling712100 China School of Life Science and Engineering Southwest University of Science and TechnologyMianyang621010 China Department of Biological Sciences Institute of Environmental SciencesUniversity of Quebec at MontrealMontrealQuebec C3H 3P8 Canada CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu610041 China Zoige Peatland and Global Change Research Station Chengdu Institute of BiologyChinese Academy of SciencesHong yuan624400 China Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyang621010 China Department of Microbiology and Plant Biology Center for Spatial AnalysisUniversity of OklahomaNormanOklahoma 73019 USA Department of Landscape Architecture Sichuan College of Architectural TechnologyDeyang61800 China College of Economics Heilongjiang Institute of TechnologyHarbinHeilongjiang 150050 China College of Resources and Environmental Science Henan Agricultural UniversityZhengzhouHenan 450002 China

Often referred to as the“Third Pole,”China’s Qinghai-Tibetan Plateau developed large amounts of peatland owing to its unique alpine *** a renewable resource,peat helps to regulate the climate as well as performing other important ***,in recent years,intensifying climate change and anthropogenic disturbances have resulted in peatland degradation and consequently made sustainable development of peatland more *** review summarizes peatland ecological and economic functions,including carbon sequestration,biodiversity conservation,energy supplies,and *** identifies climate change and anthropogenic disturbances as the two key factors attributing to peatland degradation and ecosystem carbon *** problems in environmental degradation and future challenges in peatland management under the effects of global warming are also discussed and highlighted.

关键词： climate change mitigation peatland management renewable resource sustainable development

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矿物质在肉牛饲养中的作用

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饲料工业 2022年第24期43卷 1-8页

作者：孟庆翔中国农业大学动物科学技术学院北京100193

矿物质在肉牛饲养中具有重要的作用,包括维持骨骼发育、免疫功能、肌肉收缩和神经系统功能等。肉牛至少需要17种矿物元素,包括7种常量矿物元素和10种微量矿物元素。矿物元素间具有相对复杂的相互作用关系,其中包括钙磷比、镁钾钙比值、... 详细信息

矿物质在肉牛饲养中具有重要的作用,包括维持骨骼发育、免疫功能、肌肉收缩和神经系统功能等。肉牛至少需要17种矿物元素,包括7种常量矿物元素和10种微量矿物元素。矿物元素间具有相对复杂的相互作用关系,其中包括钙磷比、镁钾钙比值、铜-钼-硫相互作用、铜-硫相互作用、铜-铁相互作用、硒-硫相互作用等。矿物元素在饲粮中的生物学利用率是衡量其营养价值的重要指标。一般来说,矿物元素中硫酸盐和氯化物的生物学利用率高于氧化物,而且铜、锰和锌的有机形态的相对生物学利用率明显高于其相应的无机形态的相对生物学利用率。在肉牛饲养中,可以通过多种方式补充矿物质,包括简单盐基预混料方式、微量元素舔块方式、蛋白质浓缩料方式和全混日粮方式等。

关键词：矿物质肉牛相互作用关系生物学利用率常量矿物元素微量矿物元素

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肉牛饲料营养价值研究之常量矿物元素营养

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饲料工业 2020年第17期41卷 9-12页

作者：孟庆翔中国农业大学动物科技学院北京100193

文章以列表方式给出了我国肉牛常用饲料基于干物质基础的常量矿物元素含量数据,包括钙、磷、镁、钾、钠、氯和硫等。对于肉牛生长和繁殖来说,常量矿物元素不仅在饲料中的含量重要,而且其比例关系也同样值得重视。文中列出了7种重要的矿... 详细信息

文章以列表方式给出了我国肉牛常用饲料基于干物质基础的常量矿物元素含量数据,包括钙、磷、镁、钾、钠、氯和硫等。对于肉牛生长和繁殖来说,常量矿物元素不仅在饲料中的含量重要,而且其比例关系也同样值得重视。文中列出了7种重要的矿物元素比例关系。

关键词：肉牛饲料营养价值常量矿物元素钙磷比饲粮阴阳离子差镁钾钙比值

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肉牛饲料营养价值研究之维生素及添加剂饲料有效成分

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饲料工业 2020年第23期41卷 14-15页

作者：孟庆翔中国农业大学动物科技学院北京100193

文章提供了我国肉牛常用维生素饲料和添加剂饲料的有效成分数据。肉牛常用的维生素饲料原料主要包括那些提供维生素A、D和E的饲料。在添加剂饲料部分,本文简要列出了在肉牛饲养中常用的某些天然矿物质原料、合成氨基酸、活菌制剂、酶和... 详细信息

文章提供了我国肉牛常用维生素饲料和添加剂饲料的有效成分数据。肉牛常用的维生素饲料原料主要包括那些提供维生素A、D和E的饲料。在添加剂饲料部分,本文简要列出了在肉牛饲养中常用的某些天然矿物质原料、合成氨基酸、活菌制剂、酶和其他添加剂饲料原料。考虑到维生素饲料和添加剂饲料中的有效成分含量会受到饲料原料种类、产地、加工、测定方法以及人为掺假等多种因素的影响,用户在应用时需要给予注意。

关键词：肉牛饲料营养价值维生素饲料添加剂饲料有效成分

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