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Application of machine learning in predicting the rate-dependent compressive strength of rocks

Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1356-1365页

作者： Mingdong Wei wenzhao meng Feng Dai Wei Wu School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

Accurate prediction of compressive strength of rocks relies on the rate-dependent behaviors of rocks, and correlation among the geometrical, physical, and mechanical properties of rocks. However, these properties may not be easy to control in laboratory experiments, particularly in dynamic compression experiments. By training three machine learning models based on the support vector machine(SVM), backpropagation neural network(BPNN), and random forest(RF) algorithms, we isolated different input parameters, such as static compressive strength, P-wave velocity, specimen dimension, grain size, bulk density, and strain rate, to identify their importance in the strength prediction. Our results demonstrated that the RF algorithm shows a better performance than the other two algorithms. The strain rate is a key input parameter influencing the performance of these models, while the others(e.g. static compressive strength and P-wave velocity) are less important as their roles can be compensated by alternative parameters. The results also revealed that the effect of specimen dimension on the rock strength can be overshadowed at high strain rates, while the effect on the dynamic increase factor(i.e. the ratio of dynamic to static compressive strength) becomes significant. The dynamic increase factors for different specimen dimensions bifurcate when the strain rate reaches a relatively high value, a clue to improve our understanding of the transitional behaviors of rocks from low to high strain rates.

关键词： Machine learning Rock dynamics Compressive strength Strain rate

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Living Chinese Herbal Scaffolds from Microfluidic Bioprinting for Wound Healing

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Research 2024年第1期2023卷 107-118页

作者： Xiaocheng Wang Jinxuan Jia mengying Niu wenzhao Li Yuanjin Zhao Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhouZhejiang 325001China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Chemistry and Biomedicine Innovation Center Nanjing UniversityNanjing 210023China

Biological scaffolds have been widely employed in wound healing applications,while their practical efficiency is compromised by insufficient oxygen delivery to the 3-dimensional constructs and inadequate nutrient supply for the long-term healing process.Here,we present an innovative living Chinese herbal scaffold to provide a sustainable oxygen and nutrient supply for promoting wound healing.Through a facile microfluidic bioprinting strategy,a traditional Chinese herbal medicine(Panax notoginseng saponins[PNS])and a living autotrophic microorganism(microalgae Chlorella pyrenoidosa[MA])were successfully encapsulated into the scaffolds.The encapsulated PNS could be gradually released from the scaffolds,which promoted cell adhesion,proliferation,migration,and tube formation in vitro.In addition,benefiting from the photosynthetic oxygenation of the alive MA,the obtained scaffolds would produce sustainable oxygen under light illumination,exerting a protective effect against hypoxia-induced cell death.Based on these features,we have demonstrated through in vivo experiments that these living Chinese herbal scaffolds could efficiently alleviate local hypoxia,enhance angiogenesis,and thereby accelerate wound closure in diabetic mice,indicating their great potential in wound healing and other tissue repair applications.

关键词： healing wound protective

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Monitoring shear deformation of sliding zone via fiber Bragg grating and particle image velocimetry

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 231-241页

作者： Deyang Wang Honghu Zhu Guyu Zhou wenzhao Yu Baojun Wang Wanhuan Zhou School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China Institute of Earth Exploration and Sensing Nanjing UniversityNanjing210023China State Key Laboratory of Internet of Things for Smart City University of MacaoMacaoChina

Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between strain measurements of quasi-distributed fiber Bragg grating(FBG)sensing arrays and shear displacements of surrounding soil remains elusive.In this study,a direct shear model test was conducted to simulate the shear deformation of sliding zones,in which the soil internal deformation was captured using FBG strain sensors and the soil surface deformation was measured by particle image velocimetry(PIV).The test results show that there were two main slip surfaces and two secondary ones,developing a spindle-shaped shear band in the soil.The formation of the shear band was successfully captured by FBG sensors.A sinusoidal model was proposed to describe the fiber optic cable deformation behavior.On this basis,the shear displacements and shear band widths were calculated by using strain measurements.This work provides important insight into the deduction of soil shear deformation using soil-embedded FBG strain sensors.

关键词： Landslide Shear band Fiber bragg grating(FBG) Particle image velocimetry(PIV) Sinusoidal model Strain‒displacement proportional coefficient

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Duplicated chalcone synthase(CHS)genes modulate flavonoid production in tea plants in response to light stress

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Journal of Integrative Agriculture 2024年第6期23卷 1940-1955页

作者： Mingzhuo Li wenzhao Wang Yeru Wang Lili Guo Yajun Liu Xiaolan Jiang Liping Gao Tao Xia State Key Laboratory of Tea Plant Biochemistry and Utilization Anhui Agricultural UniversityHefei 230036China School of Life Sciences Anhui Agricultural UniversityHefei 230036China College of Horticulture Northwest A&F UniversityYangling 712100China Department of Plant and Microbial Biology North Carolina State UniversityRaleigh 27606NCUSA

In tea plants,the abundant flavonoid compounds are responsible for the health benefits for the human body and define the astringent flavor profile.While the downstream mechanisms of flavonoid biosynthesis have been extensively studied,the role of chalcone synthase(CHS)in this secondary metabolic process in tea plants remains less clear.In this study,we compared the evolutionary profile of the flavonoid metabolism pathway and discovered that gene duplication of CHS occurred in tea plants.We identified three CsCHS genes,along with a CsCHS-like gene,as potential candidates for further functional investigation.Unlike the CsCHS-like gene,the CsCHS genes effectively restored flavonoid production in Arabidopsis chs-mutants.Additionally,CsCHS transgenic tobacco plants exhibited higher flavonoid compound accumulation compared to their wild-type counterparts.Most notably,our examination of promoter and gene expression levels for the selected CHS genes revealed distinct responses to UV-B stress in tea plants.Our findings suggest that environmental factors such as UV-B exposure could have been the key drivers behind the gene duplication events in CHS.

关键词： tea flavonoids biosynthesis CHS gene duplication UV-B stress

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An intrinsically self-healing and anti-freezing molecular chains induced polyacrylamide-based hydrogel electrolytes for zinc manganese dioxide batteries

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Journal of Energy Chemistry 2024年第2期89卷 565-578,I0013页

作者： Haiyang Liao wenzhao Zhong Chen Li Jieling Han Xiao Sun Xinhui Xia Ting Li Abolhassan Noori Mir F.Mousavi Xin Liu Yongqi Zhang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina School of Mechanical Engineering Hunan University of TechnologyZhuzhou 412007HunanChina School of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014ZhejiangChina Department of Chemistry Faculty of Basic SciencesTarbiat Modares UniversityTehran 14117-13116Iran State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200HubeiChina

The anti-freezing strategy of hydrogels and their self-healing structure are often contradictory,it is vital to break through the molecular structure to design and construct hydrogels with intrinsic anti-freezing/self-healing for meeting the rapid development of flexible and wearable devices in diverse service conditions.Herein,we design a new hydrogel electrolyte(AF/SH-Hydrogel)with intrinsic anti-freezing/self-healing capabilities by introducing ethylene glycol molecules,dynamic chemical bonding(disulfide bond),and supramolecular interaction(multi-hydrogen bond)into the polyacrylamide molecular chain.Thanks to the exceptional freeze resistance(84%capacity retention at-20℃)and intrinsic self-healing capabilities(95%capacity retention after 5 cutting/self-healing cycles),the obtained AF/SH-Hydrogel makes the zinc||manganese dioxide cell an economically feasible battery for the state-of-the-art applications.The Zn||AF/SH-Hydrogel||MnO_(2)device offers a near-theoretical specific capacity of 285 m A h g^(-1)at 0.1 A g^(-1)(Coulombic efficiency≈100%),as well as good self-healing capability and mechanical flexibility in an ice bath.This work provides insight that can be utilized to develop multifunctional hydrogel electrolytes for application in next generation of self-healable and freeze-resistance smart aqueous energy storage devices.

关键词： Flexible aqueous battery Hydrogel electrolyte Anti-freezing Self-healing Dual-dynamic reversible bond

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Fine-mapping of a candidate gene for web blotch resistance in Arachis hypogaea L.

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Journal of Integrative Agriculture 2024年第5期23卷 1494-1506页

作者： Xiaohui Wu mengyuan Zhang Zheng Zheng Ziqi Sun Feiyan Qi Hua Liu Juan Wang mengmeng Wang Ruifang Zhao Yue Wu Xiao Wang Hongfei Liu wenzhao Dong Xinyou Zhang College of Agronomy Henan Agricultural UniversityZhengzhou 450046China Henan Academy of Agricultural Sciences/Henan Academy of Crop Molecular Breeding/Key Laboratory of Oil Crops in Huang-Huai-Hai Plain Ministry of Agriculture and Rural Affairs/Henan Provincial Key Laboratory for Oil Crop ImprovementZhengzhou 450002China The Shennong Laboratory Zhengzhou 450002China Shangqiu Academy of Agricultural and Forestry Sciences Shangqiu 476000China

Peanut(Arachis hypogaea L.)is a globally important oil crop.Web blotch is one of the most important foliar diseases affecting peanut,which results in serious yield losses worldwide.Breeding web blotch-resistant peanut varieties is the most effective and economically viable method for minimizing yield losses due to web blotch.In the current study,a bulked segregant analysis with next-generation sequencing was used to analyze an F2:3 segregating population and identify candidate loci related to web blotch resistance.Based on the fine-mapping of the candidate genomic interval using kompetitive allele-specific PCR(KASP)markers,we identified a novel web blotch resistance-related locus spanning approximately 169 kb on chromosome 16.This region included four annotated genes,of which only Arahy.35VVQ3 had a non-synonymous single nucleotide polymorphism in the coding region between the two parents.Two markers(Chr.16.12872635 and Chr.16.12966357)linked to this gene were shown to be co-segregated with the resistance of peanut web blotch by 72 randomly selected recombinant inbred lines(RIL),which could be used in marker-assisted breeding of resistant peanut varieties.

关键词： peanut web blotch bulked segregant analysis KAsP markers resistant gene

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沿着合作共赢之路继续前行——纪念中美建交45周年

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美国研究 2024年第1期38卷 9-21,5页

作者：陶文钊中国社会科学院中国社会科学院美国研究所

中美建交已45年,事实证明,中美关系是世界上最重要的双边关系。中美之间的三个联合公报是一个整体,完整地体现了一个中国的原则,时至今日仍然是中美关系的政治基础。中美关系与中国的改革开放是相辅相成的。后冷战时期中美关系的底色是... 详细信息

中美建交已45年,事实证明,中美关系是世界上最重要的双边关系。中美之间的三个联合公报是一个整体,完整地体现了一个中国的原则,时至今日仍然是中美关系的政治基础。中美关系与中国的改革开放是相辅相成的。后冷战时期中美关系的底色是全球化,美国对华永久性正常贸易关系立法是中美关系具有实质性意义的突破。中国加入世界贸易组织是中国改革开放的一个里程碑。人文交流是中美关系的重要组成部分。两国关系对于结束东亚地区的冷战、对于南亚局势、对于克服2008年爆发的金融危机都做出了重要贡献。美国提出“印太战略”打压中国是不会得谨的。2023年11月旧金山中美元首峰会对于中美关系的重建具有重要历史意义,全面落实两国元首达成的共识,中美关系就能沿着合作共赢之路继续前行。

关键词：美国外交中美关系一个中国原则改革开放经济相互深度依赖旧金山中美元首峰会

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Research Progress of Different Fertilization Models in Farmland Based on Bibliometrics

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Agricultural Biotechnology 2024年第2期13卷 50-52页

作者： Xiao WANG wenzhao LI Xiong YAN Changling SUI Zhuang ZHAO Fengxue GONG Zunyi Normal University Zunyi 563006China

In order to grasp the research status of different fertilization modes in China s farmland more comprehensively, with papers in core journals of Chinese Peking University collected in CNKI database from 2003 to 2022 as the main research object, this paper analyzed the research status of different fertilization modes from the perspectives of annual number of published papers, published journals, keywords and highly cited papers applying the bibliometrics research method. This study provides reference for the research in this field.

关键词： CNKI Core journals Different fertilization modes Bibliometrics

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实现重症医学科导管相关血流零感染不是梦

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协和医学杂志 2024年第3期15卷 498-505页

作者：王滨柴文昭首都医科大学附属北京安贞医院心脏外科危重症中心北京100029 中国医学科学院北京协和医院重症医学科北京100730

导管相关血流感染(catheter related blood stream infection, CRBSI)是重症医学科的常见并发症,可导致患者住院时间延长、医疗费用增加,甚至发生脓毒症致使死亡率增加。CRBSI的感染控制已成为重症医学科乃至医院管理的重点及质量控制... 详细信息

导管相关血流感染(catheter related blood stream infection, CRBSI)是重症医学科的常见并发症,可导致患者住院时间延长、医疗费用增加,甚至发生脓毒症致使死亡率增加。CRBSI的感染控制已成为重症医学科乃至医院管理的重点及质量控制的核心。目前,重症医学科的CRBSI预防方案已基本完善,并建立了中心静脉导管置入和维护的国家标准,这些规范的建立和实施可有效降低CRBSI的发生率。重症医学科的CRBSI问题广泛存在且后果严重,表明临床中心静脉置管及使用过程中的无菌操作存在缺陷,针对其操作流程进行改进,从理论、管理、教育、规范、监督等多个层面努力,完善和落实各项感染控制要求,可有效避免和减少CRBSI的发生,甚至实现零感染。

关键词：重症医学导管相关血流感染感染控制零感染

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Evaluation of Trace Elements in the Soil of Typical Peach Orchards in Zunyi City

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Agricultural Biotechnology 2024年第1期13卷 17-19页

作者： wenzhao LI Xiong YAN Jun CHENG Xingyong WANG Changling SUI Xiangchun ZHANG Zhuang ZHAO Peng ZHOU Zunyi Normal University Zunyi 563006China Lunyi Taoli Renjia Agricultural Development Co. Ltd.Zunyi 563005China Gaofang Joint-stock Economic Cooperative Union Shenxi TownHonghuagang DistrictZunyi CityZunyi 563005China Honghuagang Science and Technology Service Center Zunyi 563099China

[Objectives]This study was conducted to clarify the enrichment and paucity of trace elements in the soil environment of peach orchards in Zunyi City,and to provide reference for supplementary application of microelement fertilizers and high-quality peach production in peach orchards.[Methods]Taking the soil of three typical peach orchards(Taoli Renjia peach orchard,Pengrui peach orchard and Taohuadao peach orchard)in Shenxi Town,Honghuagang District,Zunyi City as the research object,the contents of trace elements in soil were analyzed through field sampling and indoor determination of trace elements.[Results]The effective contents of trace elements in the soil of peach orchard bases in the study area were at a medium level,and the soil of the peach orchards was rich in available Fe and Se.The contents of available Cu,Mo and Mn were relatively rich.The contents of available B were not high overall.The contents of available Zn were at a moderate to low level overall.The soil of Taoli Renjia peach orchard was relatively rich in trace elements.[Conclusions]The research results can provide a scientific basis for the production of high-quality crispy peaches in peach orchards.

关键词： Zunyi Soil in peach orchard Trace elements Evaluation

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