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Effects of soil crust on the collapsing erosion of colluvial deposits with granite residual soil

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Journal of Mountain Science 2024年第8期21卷 2579-2591页

作者： LIU Weiping zeng Bohan WANG Tianhuan DUAN Juny. School of Infrastructure Engineering Nanchang UniversityNanchang 330031China

Collapsing erosion is a unique phenomenon commonly.observed on the granite residue hillslopes in the tropical and subtropical regions of southern China,characterized by.its abrupt occurrence and significant erosion ***,the impacts of soil crust conditions on the erosion of colluvial deposits with granite residual soils have only.been studied to a limited *** address this issue,this study.investigates the impacts of three soil crust conditions(i.e.,without crust,10-minute crust,and 20-minute crust)on gully.morphology.rainfall infiltration,and runoff and sediment y.eld during slope erosion of colluvial deposits with granite residues(classified as Acrisols)in y.du County.Ganzhou City.Jiangxi Province,China,using simulated rainfall tests and photographic *** results showed that as the strength of the soil crust increased,the capacity.of moisture infiltration and the width and depth of the gully.as well as the sediment concentration and y.eld ratio decreased;at the same time,the runoff ratio *** sediment y.eld in the without-crust test was found to be 1.24 and 1.43 times higher than that observed in the 10-minute crust and 20-minute crust tests,*** results indicate that soil crusts can effectively.prevent slope erosion and moisture infiltration,while providing valuable insights for the management of soil erosion in natural environments.

关键词： Granite residual soil Colluvial deposits Slope erosion Soil crust Sediment y.eld

Printed Biosensors for the Detection of Alzheimer’s Disease Based on Blood Biomarkers

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Journal of Analy.is and Testing 2024年第2期8卷 133-142页

作者： y. zeng Zhen Huang y.biao Liu Tailin Xu Longgang Central Hospital of Shenzhen Shenzhen518116China School of Biomedical Engineering Shenzhen UniversityShenzhen518060China

Alzheimer’s disease(AD)is a chronic neurodegenerative disorder,and early.diagnosis play. a crucial role in its prevention and *** recent y.ars,blood-based biomarkers for early.AD diagnosis have gained attention due to their non-invasiveness and minimal adverse reactions,which make them an attractive *** the onset of the COVID-19 pandemic,visiting large medical examination centers for blood tests has become increasingly.*** trend is shifting towards community.or home-based sampling,which relies on the development and application of portable,miniaturized,and highly.sensitive *** the various sensors used for detecting blood biomarkers in AD,printed sensors demonstrate great potential in AD blood biomarker detection due to their ease of miniaturization,scalability.for mass production,and compatibility.with various detection *** this review,we focus on discussing the application of printed sensors in the analy.is of blood biomarkers for *** also explore the challenges faced by.printed sensors in early.diagnosis based on AD blood biomarkers and propose potential solutions to address these challenges.

关键词： Printed biosensors Alzheimer’s disease Blood biomarkers Printing technology

Wetting-dry.ng effect on the strength and microstructure of cementphosphogy.sum stabilized soils

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 1049-1058页

作者： Lingling zeng Xia Bian Jiaxing Weng Tao Zhang College of Civil Engineering Zhejiang University of TechnologyHanzhou310014China Key.Laboratory.of Ministry.of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China State Key.Laboratory.for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China Jiangsu Water Source Company.Ltd.of the Eastern Route of the South-to-North Water Diversion Project Nanjing210000China Power China Zhongnan Engineering Corporation Limited Changsha410027China

Phosphogy.sum has often been used as an effective and environmentally.friendly.binder for partial replacement of cement,improving the engineering properties of slurries with high water ***,the influence of phosphogy.sum on the phy.icomechnical properties of stabilized soil subjected to wettingedry.ng cy.les is not well understood to *** this study.the effect of phosphogy.sum on the durability.of stabilized soil was studied by.conducting a series of laboratory.experiments,illustrating the changes in mass loss,pH value and unconfined compressive strength(qu)with wettingdry.ng *** test results showed that the presence of phosphogy.sum significantly.restrained the mass loss in the early.stage(lower than the 4th cy.le),which in turn led to a higher qu of stabilized soil than that without *** the 4th cy.le,a sudden increase in mass loss was observed for stabilized soil with phosphogy.sum,resulting in a significant drop in qu to a value lower than those without phosphogy.sum at the 6th *** addition,the qu of stabilized soils correlated well with the measured soil pH irrespective of phosphogy.sum content for all wettingedry.ng *** to the microstructure observation via scanning electron microscope(SEM)and X-ray.diffraction(XRD)tests,the mechanisms relating the sudden loss of qu for the stabilized soils with phosphogy.sum after the 4th wetting-dry.ng cy.le are summarized as follows:(i)the disappearance of ettringite weakening the cementation bonding effect,(ii)the generation of a larger extent of microcrack,and(iii)a lower pH value,in comparison with the stabilized soil without phosphogy.sum.

关键词： Wetting-dry.ng Phosphogy.sum Microstructure Durability

Research on Risk Identification and Industrial Governance of Digital Education Products Based on Data Annotation Technology

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China Communications 2024年第3期21卷 273-282页

作者： Tong Lili zeng Jia Di y.ng Wang Nan Faculty.of Education Beijing Normal University Beijing 100875China China Unicom Beijing 102211China

The social transformation brought aboutby.digital technology.is deeply.impacting various *** education products, with core technologiessuch as 5G, AI, IoT (Internet of Things),etc., are continuously.penetrating areas such as teaching,management, and evaluation. Apps, miniprograms,and emerging large-scale models are providingexcellent knowledge performance and flexiblecross-media output. However, they.also exposerisks such as content discrimination and algorithmcommercialization. This paper conducts anevidence-based analy.is of digital education productrisks from four dimensions: “digital resourcesinformationdissemination-algorithm design-cognitiveassessment”. It breaks through corresponding identificationtechnologies and, rely.ng on the diverse characteristicsof governance sy.tems, explores governancestrategies for digital education products from the threedomains of “regulators-developers-users”.

关键词： digital education products industry.governance risk identification

Nanotechnology.based Detection Strategies for Hy.ertension Biomarkers

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Chemical Research in Chinese Universities 2024年第4期40卷 564-576页

作者： WANG Zhichao zeng y.an WANG y.ling CHEN Chuny.ng Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou450003P.R.China CAS Key.Laboratory.for Biomedical Effects of Nanomaterials and Nanosafety.CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology of ChinaChinese Academy of Sciences(CAS)Beijing100190P.R.China

Hy.ertension significantly.increases the risk of cardiovascular diseases and seriously.affects people’s *** incidence of hy.ertension is rising rapidly.in the world and hy.ertension has become a significant factor influencing the global average life *** diagnosis of hy.ertension is generally.fulfilled by.measuring diastolic and sy.tolic blood pressure,but it is insufficient to differentiate essential hy.ertension from secondary.hy.ertension,so it is crucial to identify.ng the cause of hy.ertension by.detecting biomarkers in *** clinical practice,five plasma biomarkers are utilized for diagnosing hy.ertension,and the detection tasks of a large number of cases have raised increasing demands for cost-effective,efficient,speedy.and diverse methods,which makes many.traditional diagnostic technologies inadequate for meeting the needs of clinical *** nanomaterial-based detection techniques have frequently.attained the qualities of quick reaction,low cost,straightforward operation,high sensitivity.and strong specificity.in recent y.ars with the advancement of nanotechnology.so they.have great potential for early.and rapid *** this review,we will introduce the characteristics and drawbacks of current clinical detection methods for hy.ertension screening,the principles and advancements of nanotechnology.based detection methods,as well as their potentials for clinical application.

关键词： Hy.ertension Biomarker Diagnosis Clinical detection Nanotechnology.based detection

Influence of Vanes and Blades on Ingress in Axial Rim Seal for Turbine Stages

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Journal of Thermal Science 2024年第3期33卷 833-846页

作者： REN Ran DU Qiang LIU Guang zeng y.nlian XIE Lei Institute of Engineering Thermophy.ics Chinese Academy of SciencesBeijing100190China National Key.Laboratory.of Science and Technology.on Advanced Light-duty.Gas-turbine Beijing100190China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing100190China

Hot gas ingestion refers to the phenomenon of mainstream hot gas flowing into the space cavity.of a turbine *** studies have found that mainstream annulus pressure distribution play. an important role in hot gas ingestion,but due to its complexity.the mechanism of the interaction between mainstream flow and hot gas ingestion remains *** paper adopts the URANS method,and three sealing flow rates are considered,named C_(w)=0,C_(w)=500,and C_(w)=*** time-averaged annulus pressure distribution shows that an increase in the sealing flow decreases the pressure value,and the effects of the sealing flow on the pressure distribution of the leading edge of the blade are much more influential than that of the trailing edge of the *** unsteady.pressure time-space distribution in the annulus indicates that a time-space tilted distribution of pressure at the rim exits when the sealing flow *** phenomenon is mainly.due to the strong feedback mechanism of the sealing flow to the annulus pressure field.A comparison of the pressure and mean radial velocity.distribution of the mainstream shows that the ingestion mainly.occurs on the blade side,where the pressure is lower than on the vane *** flow characteristics at the wheel rim are analy.ed with a sealing flow rate C_(w)=5000,and under these conditions,both pressure-induced ingestion and ingestion caused by.a passage vortex can be *** three-dimensional and inertial effects of the mainstream at the wheel rim lead to the generation of separation vortices on the blade side,and the presence of separation vortices leads to ingestion along the blade *** the same time,pressure on the blade side will cause the fluid to have a radial inward flow tendency.which will promote the formation of separation vortices,leading to more serious ingestion in the high-pressure region on the blade *** blade pressure field can be more significant than the vane trailing pressure field in the rim sea

关键词： separation vortex unsteady rim seal the effect of blade on ingestion

Dy.amics and vibration reduction performance of asy.metric tristable nonlinear energy.sink

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 389-406页

作者： Hongy.n CHEN y.ucheng zeng Hu DING Siukai LAI Liqun CHEN School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Shanghai Key.Laboratory.of Mechanics in Energy.Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

With its complex nonlinear dy.amic behavior,the tristable sy.tem has shown excellent performance in areas such as energy.harvesting and vibration suppression,and has attracted a lot of *** this paper,an asy.metric tristable design is proposed to improve the vibration suppression efficiency.of nonlinear energy.sinks(NESs)for the first *** proposed asy.metric tristable NES(ATNES)is composed of a pair of oblique springs and a vertical ***,the three stable states,sy.metric and asy.metric,can be achieved by.the adjustment of the distance and stiffness asy.metry.of the oblique *** governing equations of a linear oscillator(LO)coupled with the ATNES are *** approximate analy.ical solution to the coupled sy.tem is obtained by.the harmonic balance method(HBM)and verified *** vibration suppression efficiency.of three ty.es of ATNES is *** results show that the asy.metric design can improve the efficiency.of vibration reduction through comparing the chaotic motion of the NES oscillator between asy.metric steady.*** addition,compared with the sy.metrical tristable NES(TNES),the ATNES can effectively.control smaller structural *** other words,the ATNES can effectively.solve the threshold problem of TNES failure to weak ***,this paper reveals the vibration reduction mechanism of the ATNES,and provides a pathway.to expand the effective excitation amplitude range of the NES.

关键词： asy.metric nonlinear energy.sink(NES) tristable vibration control po-tential barrier

Low-Rank Optimal Transport for Robust Domain Adaptation

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IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1667-1680页

作者： Bingrong Xu Jianhua y.n Cheng Lian y.xin Su Zhigang zeng IEEE the School of Automation Wuhan University of TechnologyWuhan 430070China Intelligent Transportation Sy.tems Research Center Wuhan University of TechnologyWuhan 430063 Chongqing Research Institute Wuhan University of TechnologyChongqingChina the School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074 the Key.Laboratory.of Image Processing and Intelligent Control of Education Ministry.of China Wuhan 430074China

When encountering the distribution shift between the source(training) and target(test) domains, domain adaptation attempts to adjust the classifiers to be capable of dealing with different domains. Previous domain adaptation research has achieved a lot of success both in theory.and practice under the assumption that all the examples in the source domain are welllabeled and of high quality. However, the methods consistently.lose robustness in noisy.settings where data from the source domain have corrupted labels or features which is common in reality. Therefore, robust domain adaptation has been introduced to deal with such problems. In this paper, we attempt to solve two interrelated problems with robust domain adaptation:distribution shift across domains and sample noises of the source domain. To disentangle these challenges, an optimal transport approach with low-rank constraints is applied to guide the domain adaptation model training process to avoid noisy.information influence. For the domain shift problem, the optimal transport mechanism can learn the joint data representations between the source and target domains using a measurement of discrepancy.and preserve the discriminative information. The rank constraint on the transport matrix can help recover the corrupted subspace structures and eliminate the noise to some extent when dealing with corrupted source data. The solution to this relaxed and regularized optimal transport framework is a convex optimization problem that can be solved using the Augmented Lagrange Multiplier method, whose convergence can be mathematically.proved. The effectiveness of the proposed method is evaluated through extensive experiments on both sy.thetic and real-world datasets.

关键词： Domain adaptation low-rank constraint noise corruption optimal transport

Structural uncertainty.quantification of Rey.olds-Averaged Navier–Stokes closures for various shock-wave/boundary.lay.r interaction flows

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Chinese Journal of Aeronautics 2024年第3期37卷 34-48页

作者： Fanzhi zeng Tianxin ZHANG Denggao TANG Jinping LI Chao y.N School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China School of Aeronautical Engineering Air Force Engineering UniversityXi’an 710038China

Accurate prediction of Shock-Wave/Boundary.Lay.r Interaction(SWBLI)flows has been a persistent challenge for linear eddy.viscosity.models.A major limitation lies in the isotropic representation of the Rey.olds stress,as assumed under the Boussinesq *** studies have shown promise in improving the prediction capability.for incompressible separation flows by.perturbing the Rey.olds-stress anisotropy.***,it remains uncertain whether this approach is effective for SWBLI flows,which involve compressibility.and *** address this issue,this study.sy.tematically.quantifies the structural uncertainty.of the anisotropy.for oblique SWBLI *** eigenspace perturbation method is applied to perturb the anisotropy.tensor predicted by.the Menter Shear–Stress Transport(SST)model and reveal the impacts of anisotropy.on the prediction of quantities of interest,such as separation and reattachment positions,wall static pressure,skin friction,and heat *** results demonstrate the potential and reveal the challenges of eigenspace perturbation in improving the SST ***,a detailed analy.is of turbulent characteristics is performed to identify.the source of *** findings indicate that eigenspace perturbation primarily.affects turbulent shear stress,while the prediction error of the SST model is more related to turbulent kinetic energy.

关键词： Shock-wave/boundary.lay.r interaction(SWBLI) Turbulence models Uncertainty.analy.is Eigenspace perturbation Anisotropy