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Intersecting Line of Conical Surface and Smoothly Blending of Two Tubes Whose Axes Are Non-Coplanar 认领 引用 被引量：3
1
作者 Genzhu Bai Zhi Wu Xiao Lin 《Journal of Applied Mathematics and Physics》 2017年第9期1887-1991,共105页
We construct two conical surfaces which take non-coplanar lines as generatrix and rational Bezier curve as ridge-line, and prove that the intersecting line of conical surface has similar properties to Bezier curve. Th... We construct two conical surfaces which take non-coplanar lines as generatrix and rational Bezier curve as ridge-line, and prove that the intersecting line of conical surface has similar properties to Bezier curve. Then, the smoothly blending of two cylinders whose axes are non-coplanar is realized by taking intersecting line of conical surface as axes. 展开更多
关键词 Bezier Curve Intersecting Line of Conical Surface Tubes Non-Coplanar Tubes Smoothly Blending
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CAS Action Plan for the Development of Western China Progressing Smoothly 认领 引用
2
《Bulletin of the Chinese Academy of Sciences》 2002年第1期27-31,共5页
Since CAS is charged with the key task of carrying out strategic, fundamental and forward-looking studies for this country, it is incumbent upon CAS scientists to take an active part in the National Program for the De... Since CAS is charged with the key task of carrying out strategic, fundamental and forward-looking studies for this country, it is incumbent upon CAS scientists to take an active part in the National Program for the Development of Western China. This is also an important part of the national Knowledge Innovation Program (KIP) spearheaded by CAS. Over the past two years, CAS has made a series of remarkable advances in Western China with regard to the development of research bases, exploration of crucial scientific problems, the training of talented people, and providing consultation services for decision makers.With the furtherance of the national drive to develop the country's western region, CAS will step up its efforts and increase its funding, to make more and greater contributions to the overall development of the region. 展开更多
关键词 more will Project In CAS Action Plan for the Development of Western China Progressing Smoothly
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Three-River Project Proceeds Smoothly 认领 引用
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作者 SOINAM DAGYI 《China's Tibet》 EI 1996年第1期25-27,共3页
Three－RiverProjectProceedsSmoothly￥／／SOINAMDAGYIThecentraldrainagesectionoftheYarlungZangboRiveranditstwotributaries，theNyang...
关键词 Project Three-River Project Proceeds Smoothly
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PetroChina accelerating implementation of restructuring strategy; downstream business experiencing structural adjustment smoothly 认领 引用
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《China Oil & Gas》 CAS 2000年第4期20-21,共2页
关键词 PetroChina accelerating implementation of restructuring strategy downstream business experiencing structural adjustment smoothly
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CES Flights Smoothly Moving Eastward 认领 引用
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《China's Foreign Trade》 2002年第12期40-41,共2页
At 8:30 on October 27, the first international flight from Shanghai to Singapore MU576 took off at Pudong Airport. Thus,all international flights and those to Hong Kong and Macao were all moved to Pudong Airport. Besi... At 8:30 on October 27, the first international flight from Shanghai to Singapore MU576 took off at Pudong Airport. Thus,all international flights and those to Hong Kong and Macao were all moved to Pudong Airport. Besides internationalflights and Hong Kong and Macao flights, the eastward moving also cover some domestic flights, namely flights fromSanya, Haikou, Guangzhou, Shenzhen, Zhuhai, Qingdao, Yantai, Weihai, Weifang and so on in Northwest China, Mid-South China,and East China to Shanghai. After the eastward moving, the flight distribution at two airports in Shanghai changed greatly. 展开更多
关键词 CES Flights Smoothly Moving Eastward In over
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CNNC proceeds smoothly with its nuclear projects 认领 引用
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作者 Liu Chunsheng 《Electricity》 2010年第1期
In 2009, the nuclear power plants under China National Nuclear Corporation (CNNC) continuously kept reliable operation. CNNC's seven nuclear power units accumulatively generated 38.25
关键词 CNNC proceeds smoothly with its nuclear projects work
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Three Gorges Project Goes Smoothly 认领 引用
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《Electricity》 2000年第2期55-56,共2页
关键词 Project Three Gorges Project Goes Smoothly
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Two power projects under BOT funding scheme progressing smoothly 认领 引用
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《Electricity》 1997年第1期48-48,共1页
关键词 BOT Two power projects under BOT funding scheme progressing smoothly
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不动声色 流露尊贵——Express expensiveness smoothly 认领 引用
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作者 Teacr 《汽车时代》 2003年第8期
生活在被重视的空间里是很惬意的,对男人尤其如此。 生活在被忽略的氛围中是一件不可容忍的事,对男人尤其如此。 这样一来,问题就出现了。 第一是差额的问题:所有人都希望自己被看重,所有人都在规避被忽视的窘境。而任何时候,在喧闹的... 生活在被重视的空间里是很惬意的,对男人尤其如此。 生活在被忽略的氛围中是一件不可容忍的事,对男人尤其如此。 这样一来,问题就出现了。 第一是差额的问题:所有人都希望自己被看重,所有人都在规避被忽视的窘境。而任何时候,在喧闹的人群中,众人的目光从来不会过于分散,被瞩目的名额永远是有限的。不管那些对着焦点翘首张望的人们心里。 展开更多
关键词 Express expensiveness smoothly
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First laser-plasma interaction experiments on Shenguang Octopus laser facility 认领 引用
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作者 T.Gong Z.C.Li +32 位作者 T.Xu Q.Wang Y.Y.Liu K.Q.Pan Y.Ji W.S.Zhang B.Li Z.J.Liu X.Li L.Hao R.Yan H.Zhao Y.G.Liu B.Deng X.M.Liu Y.L.Li X.S.Peng Z.Y.Guan S.W.Li X.H.Jiang Q.Li W.Zhang J.Zheng P.Li H.B.Cai S.Y.Zou Y.S.Dong F.Wang D.Yang Q.H.Zhu J.M.Yang Z.Q.Zhao Y.K.Ding 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第3期74-88,共15页
On laser facilities for achieving inertial confinement fusion ignition,several beams are usually bundled together and injected into the target chamber through a common port.This specific configuration could lead to la... On laser facilities for achieving inertial confinement fusion ignition,several beams are usually bundled together and injected into the target chamber through a common port.This specific configuration could lead to laser-plasma interaction(LPI)processes that are quite different from those of a single laser beam,as well as to more options for suppressing LPI via combination of different laser smoothing techniques on the beams in a bundle.For studying LPI of a bundle of beams,a novel facility named Shenguang Octopus has been developed.Recently,the first LPI experiments have been performed by axially irradiating a gas-filled glass pipe or a gold hohlraum target with the bundled eight laser beams at an overlapped intensity of~1×1015W~cm2,producing~5-mm-long homogeneous plasmas with densities of~3×1020cm-3and temperatures of 1.2-1.5 keV.Efficient laser propagation without plasma filamentation and beam spraying has been observed via side-on X-ray images of glass pipe targets.Results from the gold hohlraum targets indicate that single-beam backward stimulated Brillouin scattering(SBS)and multibeam seeded side-SBS play major roles in the interaction,while other multibeam LPI processes expected before the experiments are not observed.Several beam smoothing techniques,such as mixed polarizations,smoothing by spectral dispersion,and multicolor mode,are demonstrated to be effective in suppressing LPI under current conditions. 展开更多
关键词 bundled together inertial confinement fusion ignitionseveral beams inertial confinement fusion laser smoothing shenguang oc gold hohlraum laser smoothing techniques target chamber
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Optimization of smooth blasting parameters and damage mitigation in jointed rock mass roadways 认领 引用
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作者 ZUO Ting LI Xianglong +4 位作者 WANG Jianguo TIAN Xufan HUO Fei CUI Guangjiu ZHANG Xiyuan 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1772-1788,共17页
During mine roadway excavation in jointed and fractured rock masses,drilling and blasting remains a widely adopted method.However,the complex interaction between blasting-induced stress waves and pre-existing structur... During mine roadway excavation in jointed and fractured rock masses,drilling and blasting remains a widely adopted method.However,the complex interaction between blasting-induced stress waves and pre-existing structural planes often leads to overbreak,loosening of the surrounding rock,and an expanded excavation damage zone,posing significant challenges to roadway stability and construction safety.Most existing studies are limited to single-factor analyses or assume homogeneous rock mass behavior,leaving a critical gap in understanding the coupled effects of joint geometric parameters and blasting parameters on damage evolution.This study addresses this gap by developing a numerical model using LSDYNA to investigate blast damage control in jointed rock masses during roadway excavation.A systematic parametric analysis was conducted to evaluate the influence of joint dip angle(α),joint thickness(h),joint position,and blast-hole spacing(d)on blasting performance.The results show that atα=45°,particle vibration velocity at the monitoring points reaches its maximum,and fragmentation is most pronounced along the blast-hole connection line.Reducing the blast-hole spacing to 60 cm increases the peak effective stress at the joint plane to 72.8 MPa,yielding optimal fragmentation while mitigating excessive rock damage commonly associated with larger spacings.As joint thickness increases from 4 cm to 8 cm,the peak effective stress at the joint plane drops from 94.7 MPa to 70.8 MPa.This decrease of approximately 33.7%indicates that thicker joints substantially enhance stress-wave attenuation and energy dissipation.Moreover,increasing the distance between the joint and the blast hole from 5 cm to 15 cm significantly reduces damage in the rock mass between the source and the joint plane.Field validation demonstrates that the optimized smooth blasting scheme,compared to conventional blasting,improves the half-hole rate from 33.3%to 93.3%,increases the average advance per cycle from 2.43 m to 2.92 m,and reduces the depth of blast-induced damage from approximately 2.4 m to 1.5 m.These findings confirm that the proposed blasting parameters markedly enhance excavation quality and effectively limit blast-induced damage in jointed rock masses. 展开更多
关键词 Jointed rock mass Numerical simulation Smooth blasting Parameter optimization Rock mass damage
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A novel shared teleoperation control approach for nonprehensile object transportation based on orientation feedforward smoothing 认领 引用
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作者 Xinyang Fan Zhaoyang Chen +2 位作者 Zainan Jiang Fenglei Ni Hong Liu 《ENGINEERING Mechanical Engineering》 SCIE CAS CSCD 2026年第2期19-35,共17页
Nonprehensile transportation represents a fundamental approach in robotic manipulation widely implemented in practical applications,where object dynamics constraints must be strictly maintained.However,existing approa... Nonprehensile transportation represents a fundamental approach in robotic manipulation widely implemented in practical applications,where object dynamics constraints must be strictly maintained.However,existing approaches have certain limitations in operational reliability and control performance,particularly regarding execution efficiency and input adaptation.To address these limitations,we propose a novel shared teleoperation method for nonprehensile object transportation.The method reformulates constraints from object dynamics to robot kinematics level,eliminating the need for direct contact force control.It achieves autonomous orientation control through orientation feedforward smoothing while enabling shared position control based on user teleoperation inputs.Additionally,the coordination between position and attitude is ensured through input command optimization.The effectiveness of this method was evaluated through extensive trajectory tracking simulations and human subject experiments.The results demonstrate superiority over existing methods regarding operational safety,task efficiency,tracking accuracy,and input command adaptability. 展开更多
关键词 nonprehensile transportation teleoperation shared control orientation feedforward smoothing
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A two-point three-phase resolved coupling framework for modeling boulder-laden debris flows 认领 引用
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作者 Yangfan Ma Mitsuteru Asai +3 位作者 Bin Su Zheng Han Changze Li Guangqi Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期932-953,共22页
Stony debris flows,characterized by coarse boulders embedded in a sediment-laden matrix,greatly amplify destructive potential by altering flow dynamics and impact forces.Conventional single-phase particle-fluidmixture... Stony debris flows,characterized by coarse boulders embedded in a sediment-laden matrix,greatly amplify destructive potential by altering flow dynamics and impact forces.Conventional single-phase particle-fluidmixture models often struggle to capture the complexities introduced by coarse boulders and multi-phase interactions,while strong-coupling methods can be computationally prohibitive for practical hazard assessments.In this study,we propose a semi-hybrid,fully resolved coupling numerical framework for modeling boulder-laden debris flows.This framework conceptualizes debris flows as a composite system comprising a continuous viscous fluidphase(including finesediments)and a discrete phase of arbitrarily shaped coarse particles.The continuous phase is treated as a generalized nonlinear Coulomb-viscoplastic fluidusing the smoothed particle hydrodynamics(SPH)method,while coarse particles are modeled via the distributed contact discrete element method(DCDEM).These two phases are coupled through an efficienttwo-way resolved scheme,ensuring accurate simulation of flow-boulder interactions within a unifiedtimeframe.We validate the proposed method against two physical experiments:(1)gravity-driven concrete flows and(2)debris flowinteracting with slit-type barriers.Results confirmthe method's robustness in accurately capturing fluid-solid-structureinteractions and deposition processes.Its capabilities are further showcased through the simulation of a stony debris-flowevent inWenchuan County,China,highlighting its promise for real-world engineering applications and validating the effectiveness of the existing cascade dam system in mitigating debrisflowimpact and energy dissipation. 展开更多
关键词 Debris flow Large boulders Smooth particle hydrodynamics(SPH) Discrete element method(DEM) Multi-phase Resolved coupling
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Trajectory smoothing method for power-heterogenous CAV platoons at a signalized intersection 认领 引用
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作者 Zhengwu Wang Juqiang Wu +1 位作者 Qiang Wen Rujie Zhou 《Control Theory and Technology》 EI CSCD 2026年第3期485-503,共19页
Trajectory smoothing for connected and autonomous vehicles(CAVs)offers opportunities to improve traffic efficiency and reduce energy consumption,especially at intersections.Most previous studies in this research area ... Trajectory smoothing for connected and autonomous vehicles(CAVs)offers opportunities to improve traffic efficiency and reduce energy consumption,especially at intersections.Most previous studies in this research area only considered trajectory smoothing for a single CAV or assumed a homogenous CAV platoon.This paper proposes a trajectory-smoothing method for power-heterogeneous CAV platoons at signalized intersections.A Distributed Model Predictive Control(DMPC)algorithm was used to maintain a constant time headway for power-heterogeneous CAVs,considering the differences in capabilities between electric-and fuel-powered vehicles in terms of the inertial time lag to minimize speed fluctuations within the platoon.Additionally,a trajectory smoothing method was proposed that used CAV platoons as the minimum control unit,thus enabling well-formed platoons to pass through signalized intersections without stopping.Simulation experiments on the SUMO platform validated the effectiveness of the proposed methods compared to benchmark cases without trajectory smoothing for CAV platoons.This strategy can improve the traffic efficiency by reducing the total delay and waiting time,especially with high traffic demand.The results also indicate that this method can lead to substantial energy savings,highlighting the potential of advanced CAV technologies to contribute to more sustainable urban transportation systems. 展开更多
关键词 Intelligent transportation systems Trajectory smoothing Heterogeneous vehicle platoon Distributed model predictive control
How Do LncRNAs Talk to miRNAs?Decoding Their Dialogue in Atherosclerosis 认领 引用
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作者 Yating Wei Hongkang Yao +3 位作者 Xian Shi Hong Chen Rongzong Ye Chaoqian Li 《BIOCELL》 SCIE 2026年第2期93-113,共21页
Atherosclerosis,characterized by the formation of fibrofatty lesions in the arterial wall,remains a leading cause of global morbidity and mortality.Emerging evidence highlights the critical regulatory roles of long no... Atherosclerosis,characterized by the formation of fibrofatty lesions in the arterial wall,remains a leading cause of global morbidity and mortality.Emerging evidence highlights the critical regulatory roles of long non-coding RNAs(lncRNAs)and microRNAs(miRNAs)in atherogenesis.LncRNAs can function as competing endogenous RNAs(ceRNAs)by sponging miRNAs,thereby modulating the expression of downstream target mRNAs.This review summarizes current knowledge on lncRNA-miRNA-mRNA regulatory networks and their functional roles in the three major cell types involved in atherosclerotic plaque development:endothelial cells(ECs),vascular smooth muscle cells(VSMCs),and macrophages.In ECs,these networks are implicated in inflammation,apoptosis,proliferation,angiogenesis,pyroptosis,and autophagy.In VSMCs,they regulate proliferation,apoptosis,and migration.In macrophages,they influence lipid metabolism,inflammatory responses,oxidative stress,and autophagy.Although the ceRNA mechanism is predominant,some lncRNAs also act as primary transcripts for miRNAs.Additionally,exosome-mediated non-coding RNA delivery mediates intercellular crosstalk,further expanding the complexity of RNA-based regulation in atherosclerosis.Despite significant progress,challenges remain due to the complexity and context-specificity of these networks.Further research is essential to elucidate these mechanisms and explore their potential as therapeutic targets for atherosclerosis. 展开更多
关键词 Long non-coding RNA(LncRNA) microRNA(miRNA) endothelial cells vascular smooth muscle cells macrophages atherosclerosis
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Deep learning-augmented crack mapping and SPH-based dynamic simulation for landslide kinematic prediction 认领 引用
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作者 Zilin Xiang Jie Dou +7 位作者 Huiming Tang Aonan Dong Bo Peng Ke Xing Lele Zhang Hamza Daud Zewei Lu Lorenzo Brezzi 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4416-4434,共19页
On July 19,2020,the Tanjiawan landslide in Badong County,China,underwent pronounced deformation triggered by extreme rainfall,posing substantial risks to local communities and infrastructure.To elucidate its spatiotem... On July 19,2020,the Tanjiawan landslide in Badong County,China,underwent pronounced deformation triggered by extreme rainfall,posing substantial risks to local communities and infrastructure.To elucidate its spatiotemporal evolution and failure mechanisms,a comprehensive field campaign was conducted,supported by multi-source datasets including geological,topographic,lithological,precipitation,satellite remote sensing,and unmanned aerial vehicle(UAV)-based photogrammetry.Deep learning(DL)models(U-Net and ResU-Net)were employed to automatically extract ground cracks from high-resolution UAV-based orthophotos.ResU-Net achieved superior recognition accuracy(89.7%)compared to U-Net(85.9%),with cracks predominantly distributed along the rear scarp and lateral margins,consistent with field observations.Landslide stability was evaluated using the limit equilibrium method,coupled with Monte Carlo simulations to account for parameter uncertainty.Under extreme rainfall conditions(320 mm/d),the factor of safety decreased markedly from 1.079 to 0.822,while the failure probability increased by 72.82%.The post-failure dynamics were simulated using a smoothed particle hydrodynamics(SPH)model,which predicted a total run-out duration of 48 s,a peak velocity of 28 m/s at 19 s,and an average final deposit thickness of approximately 5 m.The integrated framework demonstrates the potential of DL,probabilistic stability analysis,and particle-based modeling for quantitative landslide hazard assessment and early-warning applications in rainfall-sensitive mountainous regions. 展开更多
关键词 Deep learning Multi-temporal unmanned aerial vehicle(UAV)-based ground crack mapping Post-failure kinematics Smoothed particle hydrodynamics(SPH) Spatiotemporal evolution Kinematic run-out prediction
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Probabilistic seismic hazard analysis for the northern segment of the North-South Seismic Belt in China based on improved spatial smoothing and fault source model integration 认领 引用
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作者 Yaohu Zhang Hua Pan +1 位作者 Meng Zhang Ying Shi 《Earthquake Science》 CAS CSCD 2026年第1期1-31,共31页
The northern segment of the North-South Seismic Belt is characterized by intense crustal deformation,well-developed active tectonics,and frequent occurrences of strong earthquakes.Therefore,conducting a Probabilistic ... The northern segment of the North-South Seismic Belt is characterized by intense crustal deformation,well-developed active tectonics,and frequent occurrences of strong earthquakes.Therefore,conducting a Probabilistic Seismic Hazard Analysis(PSHA)for this region is of significant importance for supporting seismic fortification in major engineering projects and formulating disaster prevention and mitigation policies.In this study,a composite seismic source model was constructed by integrating data on historical earthquakes,active faults,and paleoseismicity.Furthermore,a logic tree framework was employed to quantify epistemic uncertainties,enabling a systematic seismic hazard assessment of the region.To more accurately characterize the spatial heterogeneity of seismic activity,improvements were made to both the Circular Spatial Smoothing Model(CSSM)with a fixed radius and the Adaptive Spatial Smoothing Model(ASSM),with full consideration given to the spatiotemporal completeness of historical earthquake magnitudes.Regarding the CSSM,for scenarios involving small sample sizes in earthquake catalogs,the cross-validation method proposed in this study demonstrated higher robustness than the maximum likelihood method in determining the optimal correlation distance.Performance evaluation results indicate that while both models effectively characterize seismic activity,the ASSM exhibits superior overall predictive performance compared to the CSSM,owing to its ability to adaptively adjust the smoothing radius according to seismic density.Significant discrepancies were observed in the Peak Ground Acceleration(PGA)results calculated with a 10%probability of exceedance in 50 years across different combinations of seismic source models.The single spatially smoothed point-source model yielded a maximum PGA of approximately 0.52 g,with high-value areas concentrated near historical epicenters,thereby significantly underestimating the hazard associated with major fault zones.When combined with the simple fault-source model,the maximum PGA increased to 0.8 g,with high-value zones exhibiting a zonal distribution along faults;however,the risk remained underestimated for faults with low slip rates that are nevertheless approaching their recurrence cycles.Following the introduction of the time-dependent characteristic fault-source model,local PGA values for faults in the middle-to-late stages of their recurrence cycles increased by a factor of 2 to 7 compared to the single model.These results demonstrate that the characteristic fault-source model reasonably delineates the time-dependence of large earthquake recurrence,thereby providing a more accurate assessment of imminent seismic risks.By comprehensively applying the improved spatially smoothed pointsource model,the simple fault-source model,and the characteristic fault-source model,the following faults within the region were identified as having high seismic hazard:the Huangxianggou,Zhangxian,and Tianshui segments of the Xiqinling northern edge fault;the Maqin-Maqu segment of the Dongkunlun fault;the Longriqu fault;the Maoergai fault;the Elashan fault;the Riyueshan fault;the eastern segment of the Lenglongling fault;the Maxianshan segment of the Maxianshan northern Margin fault;and the Maomaoshan-Jinqianghe segment of the Laohushan-Maomaoshan fault.As these faults are located within seismic gaps or are approaching the recurrence periods of large earthquakes,they should be prioritized for current and future seismic monitoring as well as disaster prevention and mitigation efforts. 展开更多
关键词 northern segment of the North-South Seismic Belt fault-source characteristic earthquake spatial smoothing model
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A novel hybrid surrogate model for the stability and post-failure analysis of spatially variable slopes using a smoothed sequential limit analysis 认领 引用
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作者 H.Xu H.C.Nguyen +4 位作者 M.Nazem X.He X.Chen R.Sousa J.Kowalski 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3365-3393,共29页
This study presents a novel framework for evaluating slope stability in spatially variable soils by integrating a newly developed sequential limit analysis based on the Hellinger-Reissner functional,utilizing the node... This study presents a novel framework for evaluating slope stability in spatially variable soils by integrating a newly developed sequential limit analysis based on the Hellinger-Reissner functional,utilizing the node-based smoothed finite element method(NS-FEM),with a newly proposed deep learning(DL)approach termed multi-downsampling hybrid Linformer-convolutional neural networks(CNNs).The NS-FEM-based mixed formulation of limit analysis(MFLA)enhances computational accuracy and convergence by smoothing strain fields and mitigating numerical discontinuities commonly encountered in standard finite element methods(FEMs).This method generates reliable datasets for stochastic simulations of slope stability under both static and seismic loading conditions.To address the computational expense of specific simulations,we propose the multi-downsampling hybrid Linformer-CNN model,a sophisticated DL architecture that employs dual parallel pathways with distinct downsampling strategies–AveragePooling1D for medium-scale feature extraction and MaxPooling1D for coarse-scale feature extraction.Each pathway integrates one-dimensional(1D)CNNs for local feature extraction and Linformer-based self-attention mechanisms to efficiently capture global dependencies.The parallel downsampling strategies balance computational efficiency with feature granularity,enabling the model to leverage both local and global data characteristics effectively.The extracted multi-scale features are concatenated and further processed through fully connected networks(FCNs)to accurately predict the factor of safety(FoS)of slopes.Comparative analyses demonstrate that the hybrid Linformer-CNN model outperforms traditional FCN and CNN architectures,achieving robust and precise predictions with a mean absolute percentage error(MAPE)below 10%.Additionally,the proposed framework significantly reduces computational time,highlighting the potential of integrating NS-FEM-based MFLA with advanced DL architectures for rapid and reliable slope stability assessment in geotechnical engineering. 展开更多
关键词 Mixed formulation of limit analysis(MFLA) Node-based smoothed finite element method(NS-FEM) Multi-downsampling hybrid Linformer-CNN Slope stability Deep learning(DL)surrogate models
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兴安落叶松天然林冠层结构和光环境对天然更新幼树生长的影响 认领 引用 被引量：1
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作者 单仔赫 王可欣 董灵波 《森林工程》 北大核心 2026年第4期847-858,共12页
量化兴安落叶松天然林冠层结构和光环境与天然更新幼树生长间的关系,为促进林分天然更新和合理经营提供科学依据。以大兴安岭地区盘古林场32块样地内的677株兴安落叶松天然更新幼树为研究对象,采用半球面摄影技术获取幼树上方冠层结构指... 量化兴安落叶松天然林冠层结构和光环境与天然更新幼树生长间的关系,为促进林分天然更新和合理经营提供科学依据。以大兴安岭地区盘古林场32块样地内的677株兴安落叶松天然更新幼树为研究对象,采用半球面摄影技术获取幼树上方冠层结构指标,即冠层开阔度(canopy openness,CO)、叶面积指数(leaf area index,LAI)、冠层遮光率(canopy light obstruction rate,CLOR),以及光环境指标,即直射光、散射光、总光照,并采用方差分析、层次分割及局部平滑回归(locally estimated scatterplot smoothing,LOESS)解析其与幼树胸径、地径以及树高平均生长量间的关系。结果表明,幼树各项生长指标与冠层叶面积指数均显著负相关(P<0.01),而与冠层开阔度、直射光、散射光和总光照显著正相关(P<0.05)。总光照对胸径生长量贡献最大,散射光对地径生长量有主导作用,而直射光则对树高生长量影响显著。幼树地径和胸径生长量在冠层遮光率为0.2、叶面积指数为0.5时达生长峰值;当直射光相对强度小于等于10时、总光照小于等于24时,地径、胸径生长趋于平稳,超阈值后显著提升;树高生长则随光照增强持续上升。研究揭示冠层遮荫是幼树生长的关键限制因子,可以通过调控上层叶面积指数及林窗透光率优化天然更新。 展开更多
关键词 冠层结构 光环境 天然更新 生长贡献率 局部平滑回归(locally estimated scatterplot smoothing LOESS)
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Targeting vascular smooth muscle cells with natural compounds to combat atherosclerosis 认领 引用
20
作者 Xiangyue Qin Zihan Zhou +2 位作者 Zuguo Zheng Xiaodong Wen Hua Yang 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2026年第7期791-806,共16页
Atherosclerosis(AS)is widely recognized as the principal pathological substrate underlying chronic cardiovascular diseases(CVDs).It is a chronic,progressive,and inflammatory disease characterized by excessive lipid de... Atherosclerosis(AS)is widely recognized as the principal pathological substrate underlying chronic cardiovascular diseases(CVDs).It is a chronic,progressive,and inflammatory disease characterized by excessive lipid deposition,oxidative stress,inflammatory response,plaque formation and rupture,thrombosis and vascular calcification(VC).Vascular smooth muscle cells(VSMCs)are essential for maintaining the normal structure of blood vessels and play a pivotal role in the pathological process of AS.Their proliferation,migration,differentiation,senescence and death processes critically influence the progression of AS.The specific mechanism of VSMCs participating in AS remains a central focus of research in the cardiovascular field.In recent years,natural products have garnered considerable attention in the field of AS prevention and treatment,primarily due to their multi-target effects,low toxicity and side effects.However,there is still a lack of systematic review of natural compounds that alleviate AS by regulating the function of VSMCs.This article focuses on the core role of VSMCs in the progression of AS,and systematically reviews the natural compounds targeting VSMCs metabolism and their molecular regulatory mechanisms.By combing the relevant pharmacological activities and potential targets,the pathological function of VSMCs in AS is further elucidated,thereby providing an important theoretical basis for the development of novel and efficient AS treatment strategies. 展开更多
关键词 Cardiovascular disease Atherosclerosis Vascular smooth muscle cells Natural compounds
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