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Study on Static Three-Component Aerodynamic Force Coefficients of a Streamlined Box Girder Based on CFD 认领 引用
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作者 Shijie Guan Xu Wang Dajiang Chen 《Journal of Architectural Research and Development》 2026年第1期23-27,共5页
A systematic investigation on the static three-component aerodynamic force coefficients of a streamlined box girder cross-section is conducted using the Computational Fluid Dynamics (CFD) approach. The Reynolds-Averag... A systematic investigation on the static three-component aerodynamic force coefficients of a streamlined box girder cross-section is conducted using the Computational Fluid Dynamics (CFD) approach. The Reynolds-Averaged Navier–Stokes (RANS) equations coupled with an appropriate turbulence model are employed to establish numerical simulation models of the bridge girder under various angles of attack. The flow field structures and aerodynamic characteristics around the main girder are simulated and analyzed in detail. By comparing the variations of lift, drag, and moment responses under different angles of attack, the characteristic curves of the three-component force coefficients are obtained. Furthermore, the locations of key flow separation points, the evolution of wake vortex structures, and their influences on aerodynamic force variations are examined to elucidate the underlying flow mechanisms governing the changes in aerodynamic coefficients. The results provide theoretical insights and technical support for wind-resistant design, aerodynamic optimization of streamlined box girders, and the selection of wind tunnel test parameters. 展开更多
关键词 Streamlined box girder Computational fluid dynamics(CFD) Static aerodynamic force coefficients
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Numerical investigation on the aerodynamic drag reduction based on bottom deflectors and streamlined bogies of a high-speed train 认领 引用 被引量：11
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作者 JIANG Chen LONG jn-lan +2 位作者 LI Yan-ong GAO Guang-jun FRANKLIN Eze 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3312-3328,共17页
The complex structure of the bottom of a high-speed train is an important source of train aerodynamic drag.Thus,improving the bottom structure is of great significance to reduce the aerodynamic drag of the train.In th... The complex structure of the bottom of a high-speed train is an important source of train aerodynamic drag.Thus,improving the bottom structure is of great significance to reduce the aerodynamic drag of the train.In this study,computational fluid dynamics(CFD)based on three-dimensional steady incompressible Reynolds-average Naiver-Stokes(RANS)equations and Realizable k-εturbulence model were utilized for numerical simulations.Inspired by the concept of streamlined design and the idea of bottom flow field control,this study iteratively designed the bogies in a streamlined shape and combined them with the bottom deflectors to investigate the joint drag reduction mechanism.Three models,i.e.,single-bogie model,simplified train model,and eight-car high-speed train model,were created and their aerodynamic characteristics were analyzed.The results show that the single-bogie model with streamlined design shows a noticeable drag reduction,whose power bogie and trailer bogie experience 13.92%and 7.63%drag reduction,respectively.The range of positive pressure area on the bogie is reduced.The aerodynamic drag can be further reduced to 15.01%by installing both the streamlined bogie and the deflector on the simplified train model.When the streamlined bogies and deflectors are used on the eight-car model together,the total drag reduction rate reaches 2.90%.Therefore,the proposed aerodynamic kit for the high-speed train bottom is capable to improve the flow structure around the bogie regions,reduce the bottom flow velocity,and narrow the scope of the train’s influence on the surrounding environment,achieving the appreciable reduction of aerodynamic drag.This paper can provide a new idea for the drag reduction of high-speed trains. 展开更多
关键词 high-speed train numerical simulation drag reduction deflector streamlined design
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Multi-objective aerodynamic shape optimization of a streamlined high-speed train using Kriging model 认领 引用 被引量：13
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作者 Le ZHANG Zhi-yuan DAI +1 位作者 Tian LI Ji-ye ZHANG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2022年第3期225-242,共18页
With continuous changes to energy-saving requirements,the task of train aerodynamic optimization becomes important.Traditional aerodynamic optimization of a high-speed train is carried out assuming the same shape of t... With continuous changes to energy-saving requirements,the task of train aerodynamic optimization becomes important.Traditional aerodynamic optimization of a high-speed train is carried out assuming the same shape of the head and tail cars,which ignores the combined effect of the two cars on aerodynamic forces.The streamlined structure of the train has different effects on the aerodynamics of the head and tail cars.In-depth study of these effects will help engineers improve their shape design capabilities.Based on the surrogate model method,this paper studies the influence of five shape parameters of the streamlined area on the resistance of the head and tail cars and the lift force of the tail car of CRH380A,and compares the aerodynamic performance of the two optimization schemes.The research results show that the optimization direction for reducing drag of the head car is opposite to that for reducing the drag and lift of the tail car,while the optimization directions for reducing both drag and lift for the tail car alone,are roughly the same.Therefore,the same shaped head and tail cars are problematic for improving aerodynamic performance.After optimization,the head car’s resistance,the tail car’s resistance,and the tail car’s lift of the train with the same shape of head and tail cars are reduced by 1.7%,0.5%,and 3.5%,respectively.The train with different shapes had values decreased by 5.6%,1.4%,and 7.5%,respectively.The optimization effect of the latter is more than twice that of the former. 展开更多
关键词 High-speed train Aerodynamic force Optimization Surrogate model Streamlined area
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Effect of Streamlined Nose Length on the Aerodynamic Performance of a 800 km/h Evacuated Tube Train 认领 引用 被引量：17
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作者 Xiaohan Zhang Yao Jiang Tian Li 《Fluid Dynamics & Materials Processing》 EI 2020年第1期67-76,共10页
The aerodynamic resistance of a train running in the open air limits the maximum speed that can be attained by the train.For this reason,evacuated tube trains(ETT)are being considered as valid alternatives to be imple... The aerodynamic resistance of a train running in the open air limits the maximum speed that can be attained by the train.For this reason,evacuated tube trains(ETT)are being considered as valid alternatives to be implemented in the future.The atmosphere in the tube,the so-called blocking ratio and the length of the streamlined nose are the key factors affecting the aerodynamic performances of these trains.In the present work,we investigate evacuated tube trains with different lengths of the streamline nose on the basis of computational fluid dynamics(CFD).The three-dimensional steady compressible Navier-Stokes equations are solved.The running speed of the ETT is 800 km/h and the blocking ratio is 0.2.Results show that with the increase of the streamlined nose length,the aerodynamic drag and lift forces of the head car decrease gradually,and the drag and lift forces of the middle car change slightly.For the tail car,the drag force decreases,whereas the absolute value of the lift force increases.At a speed of 800 km/h,a slight shock wave appears at the rear of the tail car,which affects the aerodynamic forces acting on the train. 展开更多
关键词 Evacuated tube train resistance aerodynamic performance streamlined nose
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Design and Experiment of Streamlined Piezoelectric Pump with Low Vortex and Large Flow Rate 认领 引用 被引量：3
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作者 BIAN Kan HUANG Zhi +4 位作者 BAO Qibo ZHANG Jianhui LAI Liyi CHEN Xiaosheng CHEN Zhenlin 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第1期155-163,共9页
Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis dur... Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis during blood delivery.In this paper,a new valveless piezoelectric(PZT)pump with streamlined flow tubes(streamlined pump)is proposed.The design method and the working principle of the pump are analyzed.The velocity streamlines are simulated,and the results demonstrate that there are no obvious vortexes in the flow tube of the streamlined pump.Five prototype pumps(two cone pumps and three streamlined pumps)are designed and fabricated to perform flow rate and flow resistance experiments.The experimental results illustrate that the maximum flow rate of the streamlined pump is 142 mL/min,which is 179%higher than that of the cone piezoelectric pump,demonstrating that the streamlined pump has a large flow rate performance.This research provides an inspiration for future research on simple structure,low vortex and large flow rate volume-type pumps,and also provides a useful solution for thrombosis preventing. 展开更多
关键词 valveless piezoelectric pump streamlined low vortex high flow rate thrombosis
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Effect of streamlined nose length on aerodynamic performance of high-speed train with a speed of 400 km/h 认领 引用 被引量：3
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作者 Nianxun LI Tian LI +2 位作者 Zhiyuan DAI Deng QIN Jiye ZHANG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2024年第7期525-540,共16页
The streamlined nose length(SNL)plays a crucial role in determining the aerodynamic performance of high-speed trains.An appropriate SNL can not only effectively reduce the magnitude of aerodynamic drag and lift forces... The streamlined nose length(SNL)plays a crucial role in determining the aerodynamic performance of high-speed trains.An appropriate SNL can not only effectively reduce the magnitude of aerodynamic drag and lift forces,but also improve the performance of the high-speed train in tunnel passing and crosswind circumstances.In this study,a numerical simulation of the aerodynamic performance of high-speed trains at a speed of 400 km/h,with varying SNLs,is conducted using the k-ωshear stress transport(SST)turbulence model.The different SNLs include 6.0,7.0,8.0,9.0,9.8,12.0,15.0,and 18.0 m.In order to validate the accuracy of the numerical simulation,its results are compared with wind tunnel test data obtained from the literature.Numerical simulation is carried out using compressible and incompressible gases to determine the effect of gas compressibility on results.The impact of SNL on the aerodynamic performance of the trains is analyzed in terms of aerodynamic forces,velocity,and pressure distributions.In comparison to the original train,the train with a 6.0 m SNL experienced a 10.8%increase in overall aerodynamic resistance.Additionally,the lift forces on the head and tail cars increased by 35.7%and 75.5%,respectively.On the other hand,the train with an 18.0 m SNL exhibited a 16.5%decrease in aerodynamic drag.Furthermore,the lift forces on the head and tail cars decreased by 21.9%and 49.7%,respectively.The aerodynamic drag force of the entire train varies linearly with the SNL,while the aerodynamic lift of the tail car follows a quadratic function in relation to the SNL. 展开更多
关键词 Streamlined nose length(SNL) High-speed train Aerodynamic performance Numerical simulation Flow structures
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Reduced energy consumption by using streamlined gating systems 认领 引用
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作者 Sфren Skov-Hansen Niels Skat Tiedje 《China Foundry》 SCIE CAS 2008年第4期272-279,共8页
In foundries a lot of effort is done to minimize energy consumption in the production to reduce costs and hence increase the competitiveness. At the same time the foundries must live up to the increased demands for hi... In foundries a lot of effort is done to minimize energy consumption in the production to reduce costs and hence increase the competitiveness. At the same time the foundries must live up to the increased demands for high quality castings. Traditional gating systems are known for a straight tapered down runner, a well base and 90° bends in the runner system. Previous work has shown that the traditional way of designing gating systems creates high inconsistency in flow patterns during filling. In the streamlined gating systems there are no sharp changes in direction and a large effort is done to confine and control the flow of the molten metal during mould filling. The main objective in the work presented here is to use the principles of the streamlined gating systems to reduce the weight of the gating system relative to the traditional layouts. By reducing the weight of gating system and thereby improving yield, the amount of molten iron needed is also reduced, hence reducing the energy consumption for melting. Experiments in real production lines have proven that it is possible to achieve a reduction in the poured weight by using the streamlined gating systems. In a layout for casting of three valve housings in a vertically parted mould the weight of the gating system was reduced by 1.1 kg changing from the traditional layouts to the streamlined gating systems. This weight reduction corresponds in this case to a 20% weight reduction for the gating system. Using streamlined gating systems with fan gates to give a beneficial heat distribution in the castings may be an efficient tool to eliminate the need for heat treatment. In the experiments the change in gating system from the traditional layout to the streamlined layout removed the need for heat treatment. This obviously means a huge energy saving in the foundry. The energy consumption for heat treatment of iron has been found to be 0.489 kWh/ kg. The valve housing in the experiments weighs 3 kg so when the need for heat treatment is removed, around 1.5 kWh is saved per casting. Along with the reduction in energy used the foundry also save the cost of handling the castings for the heat treatment and the production times is reduced considerably When the moulds for the vertical layout is produced on a DISAMATIC that produces 350 moulds an hour the total energy saved per hour for both melting and heat treatment becomes 2,000 kWh and per eight hour work day 16,000 kWh. Seen in this perspective the potential for saving energy in the foundries is substantial. Furthermore the experiments where ductile iron valve housings was cast also proved that it is possible to lower the pouring temperature from 1,400℃ to 1,300℃ without the risk of cold runs. This is possible due to a high flow rate during mould filling in combination with low velocities due to the use of fan gates. All of this has also been investigated in experiments using glass plate fronted moulds. 展开更多
关键词 streamlined gating systems energy consumption mould filling weight layout
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Streamlined System 认领 引用
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作者 Yu Nan 《ChinAfrica》 2014年第12期40-41,共2页
WANG Xianlong didn＇t expect it would take only five working days to register his business, an outdoor products company based in Yiwu, a city in east China＇s Zhejiang Province. ＂Previously, getting administrative ap... WANG Xianlong didn＇t expect it would take only five working days to register his business, an outdoor products company based in Yiwu, a city in east China＇s Zhejiang Province. ＂Previously, getting administrative approval used to take at least three weeks.＂ Wang said. ＂1 would have to go back and forth between several government departments. But now, the Yiwu Administration Service Center offers a onestop service for enterprises. It＇s much faster.＂ 展开更多
关键词 Streamlined System FTZ
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Stereogenic P(V)platform construction via streamlined installation 认领 引用
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作者 Jing-Ming Zhang Shi-Feng Tao +3 位作者 Xing-Kai Zhao Han Yang Gong Xu Zhi-Tao He 《Science Bulletin》 SCIE EI CAS CSCD 2026年第8期1957-1967,共11页
Molecules bearing a fully heteroatom-substituted phosphorus(Ⅴ)stereocenter exist ubiquitously in medicines,agroscience and catalysis fields.Due to the lack of efficient and robust catalytic asymmetric methods,approac... Molecules bearing a fully heteroatom-substituted phosphorus(Ⅴ)stereocenter exist ubiquitously in medicines,agroscience and catalysis fields.Due to the lack of efficient and robust catalytic asymmetric methods,approaches to achieve fully heteroatom-substituted phosphorus(Ⅴ)stereocenters usually rely on conventional chiral auxiliary control and resolution pathways.Recent catalytic protocols are built on tedious stepwise synthesis from complex P(Ⅴ)precursors.Here,we report a streamlined installation strategy to achieve various fully heteroatom-substituted P(Ⅴ)stereocenters from simple POCl3.Thirteen types of N-,O-,and S-based nucleophiles are adopted for the preparation of six types of P(Ⅴ)stereocenters.Over 100 examples are provided to show the generality and reliability of the synthetic method.This protocol is also applied to the concise synthesis of twelve bioactive molecules and analogs.The antifungal evaluations of the prepared compounds reveal two new fungicide candidates and also suggest the importance of the stereochemistry for bioactivity. 展开更多
关键词 Phosphorus(V)stereocenter POCl3 Streamlined installation Bioactive molecule synthesis Fungicide discovery
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Bidentate P-O-Ni motif-induced"proton sponge effect"streamlines hydrogen escape for paired electrode reactions 认领 引用
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作者 Keping Wang Mei Wu +3 位作者 Zhenrong Liu Xihong Lu Song Yang Hu Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期880-891,I0021,共12页
The hybrid water splitting system offers a carbon-neutral solution to relieve energy-related challenges,with the proton activation/migration in reactants entailing tailor-made anodic and cathodic catalysts.Herein,a P-... The hybrid water splitting system offers a carbon-neutral solution to relieve energy-related challenges,with the proton activation/migration in reactants entailing tailor-made anodic and cathodic catalysts.Herein,a P-containing oxyanion-induced"proton sponge effect"is engineered to enable simultaneous two-electrode reactions of enhanced efficiency via streamlining hydrogen escape.Via hydrothermal and phosphorylation treatment,the constructed bidentate P-O-Ni motif is highly active for paired benzylamine oxidation and hydrogen evolution,affording benzonitrile with a>99%yield and Faradaic efficiency,and H2in an evolution rate of 25.8 mL cm-2h-1,respectively.The protophilic P-oxyanion elongates the C-H/N-H bond of benzylamine to streamline its cleavage and enables the O-H destabilization of Ni2+-OH to expedite Ni3+-O formation,collectively propelling benzonitrile production.Meanwhile,the rigid H-OH network of water can be undermined by the oxyanion to prolong its O-H bond,favoring the generation of active H*to bolster H2evolution.Various primary amines are also amenable to the developed protocol,attaining 91-98%yields for nitriles.Additionally,the developed anode/cathode demonstrates excellent survivability(60 h at least)in membrane electrode assembly systems.This work emphasizes the feasibility/criticality of streamlining proton transfer for both electrodes,pioneering an insightful paradigm for electrocatalyst customization in concurrent electrooxidation and hydrogen production. 展开更多
关键词 Paired electrode reactions Streamlining hydrogen escape Nitrile evolution reaction Water dissociation Membrane electrode assembly
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MDBP:An Integrated Web-Based Platform for Accelerating Mutagenesis-Directed Breeding 认领 引用
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作者 PENG Yan MAO Bigang +2 位作者 TANG Wenbang ZHAO Bingran SHAO Ye 《Rice science》 SCIE CAS CSCD 2026年第4期411-414,I0002-I0289,共4页
Targeted deep sequencing provides an effective tool for acquiring target-gene mutations;however,as the number of target genes and the volume of sequencing data increase exponentially,a critical bioinformatic bottlenec... Targeted deep sequencing provides an effective tool for acquiring target-gene mutations;however,as the number of target genes and the volume of sequencing data increase exponentially,a critical bioinformatic bottleneck has emerged due to the lack of integrated analytical pipelines to accurately identify mutants from massive datasets.To address this challenge,we developed the Mutagenesis Directed Breeding Platform(MDBP),an integrated web-based toolkit designed to streamline the entire data analysis workflow through four core modules:Pool Construction,Mutation Screening,KASP Primer Design,and Individual Plant Location.Validated with a large-scale population of 7296 individuals from a hybrid rice restorer line R8022 subjected to heavy-ion mutagenesis,MDBP enabled the simultaneous identification and precise mapping of 50 target-gene mutants carrying 28 distinct mutations within exon regions.This integrated approach effectively transforms what was once a months-long process of fragmented manual data handling into a streamlined,automated operation,providing a versatile framework for accelerated directed crop improvement across diverse species. 展开更多
关键词 targeted deep sequencing breeding mutagenesis directed breeding platform mdbp bioinformatic bottleneck identify mutants streamline entire data analysis workflow th sequencing data target genes
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Effect of the Aspect Ratio of Box Girders on the Buffeting Response of Long-Span Suspension Bridges 认领 引用
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作者 Jingxiang Zhou Qiaoling Zhou +3 位作者 Chunlian Liang Yulu Guo Zhao Xiao Yingfeng Xu 《Structural Durability & Health Monitoring》 EI 2025年第4期953-983,共31页
Streamlined box girders serve as a prevalent choice for the primary structural elements in large-span suspension bridge designs.With the increase in traffic demands,the design of such girders is evolving towards wider... Streamlined box girders serve as a prevalent choice for the primary structural elements in large-span suspension bridge designs.With the increase in traffic demands,the design of such girders is evolving towards wider bridge decks and larger aspect ratios(B/D).To obtain more effective and aerodynamic design shapes for streamlined box girders,it is essential to investigate the impact of B/D on their aerodynamic performance.Accordingly,in this study we investigate the buffeting responses of large-span suspension bridges using girders of varying aspect ratios(B/D of 7.5,9.3,and 12.7).First,the aerodynamic coefficients of these girders are estimated using computational fluid dynamics(CFD)simulations.Subsequently,spatial finite element(FE)models of three long-span suspension bridges with different girders(B/D of 7.5,9.3,and 12.7)are established in Ansys software,and the dynamic characteristics of these bridges are obtained.Then,the time-domain buffeting analysis is performed by simulating the fluctuating wind fields acting on the bridge through the spectral representation method.Ultimately,the buffeting responses are computed using Ansys software,and the impact of B/D on these responses is assessed.The results reveal that the root mean square(RMS)values of the main girder’s buffeting displacement are highest at the midspan position and are lowest at the ends of the bridge.A decrease in B/D of the main girder leads to a more severe buffeting response because both the range and the effective value of the displacement increase with the decreasing B/D.Comparing the buffeting displacements in three directions,B/D plays a significant role in the vertical buffeting displacement,moderately impacts the torsional displacement,and has the least effect on the lateral displacement.The findings of this study may help wind resistance analysis and design optimization for bridges. 展开更多
关键词 Long-span suspension bridge buffeting response aspect ratio streamlined box girder turbulent flow
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Hydrodynamical characterization of nanofluidic flow driven by forced convection via a four-sided lid-driven cavity 认领 引用
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作者 M.USMAN M.HAMID +1 位作者 W.A.KHAN R.U.HAQ 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第7期1383-1402,共20页
The unsteady magnetohydrodynamical(MHD)free convection flow of an incompressible,electrically conducting hybrid nanofluid within a vertical cylindrical geometry is investigated,incorporating the effects of thermal rad... The unsteady magnetohydrodynamical(MHD)free convection flow of an incompressible,electrically conducting hybrid nanofluid within a vertical cylindrical geometry is investigated,incorporating the effects of thermal radiation,viscous dissipation,and internal heat generation.The system is subjected to a time-periodic boundary temperature condition.The Laplace and finite Hankel transforms are used to derive the exact solutions for the velocity and temperature distributions.The effects of various key physical parameters,including the Richardson number,the Eckert number,the radiation parameter,the heat source parameter,and the nanoparticle volume fraction,are considered.The numerical results reveal that increasing the volume fraction significantly enhances the thermal conductivity and temperature,while the magnetic field intensity and viscous dissipation strongly influence the fluid motion and heat transport.Additionally,the pulsating boundary conditions produce distinct oscillatory behaviors in both the velocity and temperature fields.These findings provide important insights into optimizing the heat transfer performance in cylindrical systems such as electronic cooling modules and energy storage devices operating under dynamic thermal conditions. 展开更多
关键词 forced convection lid-driven cavity streamline finite element method
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Strengthening of Composite Holes Inspired by Encased and Intergrown Knots 认领 引用
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作者 Dongxu Liu Deyuan Zhang 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第5期2503-2520,共18页
Tree knots are generally considered defects in wood,but how the surrounding structures of the defects affects strength of wood has not been studied.Here the mechanical properties of static compression and hole bearing... Tree knots are generally considered defects in wood,but how the surrounding structures of the defects affects strength of wood has not been studied.Here the mechanical properties of static compression and hole bearing tests were designed for encased knots and intergrown knots,and the strengthening mechanism of streamline tissue and connecting interface was analyzed by finite element modeling.And the two reinforced structures were applied to composite structural holes and connecting holes,which significantly improved open hole compressive strength and hole bearing strength.And the finite element models for two kinds of composite hole were created to analyze how the stress field around the reinforced structure strengthens the composite.Both the experimental results and the finite analysis results show that the streamline structure could effectively improve the compressive properties of composite structural holes,and the connecting interface provided a stable constraint for giving full play to the hole bearing properties of stronger materials.These two structures will provide reference for the structural design of lightweight composites. 展开更多
关键词 Tree knots Streamline tissue Connecting interface Composite holes
A New Era of Consumption 认领 引用
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作者 ZHANG XIAO 《ChinAfrica》 2025年第10期48-49,共2页
Bathed in the golden light of September,Beijing’s Shougang Park hosted the 2025 China International Fair for Trade in Services(CIFTIS).At the heart of the event,a dynamic spirit of renewal was evident,as emerging pat... Bathed in the golden light of September,Beijing’s Shougang Park hosted the 2025 China International Fair for Trade in Services(CIFTIS).At the heart of the event,a dynamic spirit of renewal was evident,as emerging patterns in cultural,tourism,and sports consumption unfolded throughout the fair.From the creative integration of the centuries-old Peking Opera with innovative business models,to immersive sports experiences and the rollout of streamlined tax refund procedures for international visitors,the fair showcased a nuanced yet significant shift in consumption practices. 展开更多
关键词 cultural consumption tourism consumption immersive experiences sports consumption peking opera consumption rollout streamlined tax refund procedures business models
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Spatially-varying Kuroshio surface water intrusion into the East China Sea shelf on seasonal and interannual time scales 认领 引用
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作者 Longqing Wang Yisen Zhong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2025年第8期20-31,共12页
Using the satellite altimeter data from 1993 to 2021,this study investigates the seasonal and interannual variations of Kuroshio surface water intrusion into the East China Sea(ECS)with an emphasis on transports acros... Using the satellite altimeter data from 1993 to 2021,this study investigates the seasonal and interannual variations of Kuroshio surface water intrusion into the East China Sea(ECS)with an emphasis on transports across different isobaths.The results reveal that the intrusion variability differs among the isobaths used to identify the intrusion.On the seasonal scale,the transport volume and proportion of intrusion into the outer shelf(across 200 m isobath)are greatest in spring compared to other seasons possibly because of the relief of northerly monsoon and the increase of Kuroshio transport.However,in the inner shelf regions(across 100 m isobath),the strongest intrusion occurs in summer,with a much longer residence period and broader spatial range,though the Kuroshio moves farthest away from the coast.This implies that the Kuroshio may have the highest exchange efficiency with the ECS shelf water during summer.On the interannual scale,increased upstream transport from the Kuroshio and shoreward movement of the current almost equally contribute to the enhancement of surface water intrusion into the outer shelf regions.In contrast to the seasonal characteristics,the interannual intrusion into the shallower shelf regions(across the 120 m and 100 m isobaths)is primarily correlated to the position of the Kuroshio axis,i.e.,the closer to the coast the Kuroshio is,the more water can enter the inner continental shelf.This result highlights that the importance of factors that control the intrusion variabilities may also change between seasonal and interannual time scales when different isobaths are used. 展开更多
关键词 Kuroshio intrusion seasonal and interannual variabilities East China Sea shelf geostrophic streamlines
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One year clinical outcomes with a novel canaloplasty device in mild to severe open angle glaucoma 认领 引用
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作者 Iden M.Amiri Heran W.Gebreyesus +3 位作者 Nathan Grove Jennifer L.Patnaik Malik Y.Kahook Leonard K.Seibold 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2025年第9期1673-1680,共8页
AIM:To evaluate the one-year clinical outcomes of a novel canaloplasty device used in combination with cataract extraction(CE)in patients with mild to severe open angle glaucoma(OAG).METHODS:This study reviewed patien... AIM:To evaluate the one-year clinical outcomes of a novel canaloplasty device used in combination with cataract extraction(CE)in patients with mild to severe open angle glaucoma(OAG).METHODS:This study reviewed patients diagnosed with mild to severe OAG,who underwent canaloplasty with the STREAMLINE®Surgical System combined with CE.The primary outcome was surgical success,defined as achieving≥20%intraocular pressure(IOP)reduction and/or a reduction of≥1 glaucoma medication compared to baseline.Secondary outcomes included mean IOP,average number of glaucoma medications,and best-corrected distance visual acuity(BCDVA).Data was collected preoperatively and at multiple postoperative time points up to one year.RESULTS:A total of 68 eyes of 47 patients were included with mean age was 73.1±7.0y and 60%were females.Surgical success at one year was achieved in 68.8%of eyes,with 67.6%success in mild,80.0%in moderate,and 66.7%in severe OAG cases.IOP was significantly reduced from a baseline of 16.1±0.5 to 14.7±0.4 mm Hg at one year(P=0.0004).The number of medications decreased significantly in all eyes from a baseline of 1.2±0.1 to 0.6±0.1 at one year(P<0.0001).When stratified by glaucoma severity,only the mild group experienced a statistically significant decrease from a baseline of 1.1±0.1 to 0.4±0.1(P<0.0001).BCDVA improved significantly from baseline to one year.No sight-threatening complications were reported.CONCLUSION:Canaloplasty using the STREAMLINE®surgical system combined with CE effectively reduces IOP at one year in mild to severe OAG with minimal complications.IOP lowering efficacy,reduction in IOP lowering medications,and safety in moderate to severe OAG require further study. 展开更多
关键词 open angle glaucoma STREAMLINE Surgical System microinvasive glaucoma surgery canaloplasty
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基于FPGA的DDS IP核的研究与设计 认领 引用 被引量：3
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作者 万志江 《微电子学与计算机》 CSCD 北大核心 2013年第8期98-102,共5页
针对传统的用单片机和DDS芯片设计高频信号发生器的方法具有的硬件结构复杂、人机交互性差和低可移植性等问题,提出了一种实现高频信号发生器功能的直接数字频率合成器(DDS)IP软核的设计方法.本设计首先通过加权的方法实现十进制向二进... 针对传统的用单片机和DDS芯片设计高频信号发生器的方法具有的硬件结构复杂、人机交互性差和低可移植性等问题,提出了一种实现高频信号发生器功能的直接数字频率合成器(DDS)IP软核的设计方法.本设计首先通过加权的方法实现十进制向二进制的转换,提高IP核的人机交互性,并引入streamlined算法在FPGA上实现频率控制字产生单元,解决传统设计中硬件结构复杂的问题.然后,在ISE设计平台上采用Verilog HDL硬件描述语言进行DDS行为描述,连接频率控制字产生单元,实现一个可重载的DDS IP软核.最后,在XILINX SEEDXDTK V5实验平台上对IP核进行板级验证.验证结果表明,此IP核具有良好的人机交互性和可移植性,能够很好的满足实际应用. 展开更多
关键词 DDSIP核 streamlined 快速进位链 人机交互
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Well production optimization using streamline features-based objective function and Bayesian adaptive direct search algorithm 认领 引用 被引量：10
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作者 Qi-Hong Feng Shan-Shan Li +2 位作者 Xian-Min Zhang Xiao-Fei Gao Ji-Hui Ni 《Petroleum Science》 SCIE CAS CSCD 2022年第6期2879-2894,共16页
Well production optimization is a complex and time-consuming task in the oilfield development.The combination of reservoir numerical simulator with optimization algorithms is usually used to optimize well production.T... Well production optimization is a complex and time-consuming task in the oilfield development.The combination of reservoir numerical simulator with optimization algorithms is usually used to optimize well production.This method spends most of computing time in objective function evaluation by reservoir numerical simulator which limits its optimization efficiency.To improve optimization efficiency,a well production optimization method using streamline features-based objective function and Bayesian adaptive direct search optimization(BADS)algorithm is established.This new objective function,which represents the water flooding potential,is extracted from streamline features.It only needs to call the streamline simulator to run one time step,instead of calling the simulator to calculate the target value at the end of development,which greatly reduces the running time of the simulator.Then the well production optimization model is established and solved by the BADS algorithm.The feasibility of the new objective function and the efficiency of this optimization method are verified by three examples.Results demonstrate that the new objective function is positively correlated with the cumulative oil production.And the BADS algorithm is superior to other common algorithms in convergence speed,solution stability and optimization accuracy.Besides,this method can significantly accelerate the speed of well production optimization process compared with the objective function calculated by other conventional methods.It can provide a more effective basis for determining the optimal well production for actual oilfield development. 展开更多
关键词 Well production Optimization efficiency Streamline simulation Streamline feature Objective function Bayesian adaptive direct search algorithm
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Study of the mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery for post-polymer-flooded reservoirs 认领 引用 被引量：11
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作者 Qing-Jun Du Guang-Ming Pan +4 位作者 Jian Hou Lan-Lei Guo Rong-Rong Wang Zhi-Zeng Xia Kang Zhou 《Petroleum Science》 SCIE CAS CSCD 2019年第3期606-618,共13页
Streamline-adjustment-assisted heterogeneous combination flooding is a new technology for enhanced oil recovery for post-polymer-flooded reservoirs.In this work,we first carried out a series of 2D visualization experi... Streamline-adjustment-assisted heterogeneous combination flooding is a new technology for enhanced oil recovery for post-polymer-flooded reservoirs.In this work,we first carried out a series of 2D visualization experiments for different chemical flooding scenarios after polymer flooding.Then,we explored the synergistic mechanisms of streamline-adjustment-assisted heterogeneous combination flooding for enhanced oil recovery and the contribution of each component.Test results show that for single heterogeneous combination flooding,the residual oil in the main streamline area after polymer flooding is ready to be driven,but it is difficult to be recovered in the non-main streamline area.Due to the effect of drainage and synergism,the streamline-adjustment-assisted heterogeneous combination flooding diverts the injected chemical agent from the main streamline area to the non-main streamline area,which consequently expands the active area of chemical flooding.Based on the results from the single-factor contribution of the quantitative analysis,the contribution of temporary plugging and profile control of branched preformed particle gels ranks in the first place and followed by the polymer profile control and the effect of streamline adjustment.On the contrary,the surfactant contributes the least to enhance the efficiency of oil displacement. 展开更多
关键词 Plate sand-pack model Heterogeneous combination flooding Streamline adjustment Polymer flooding Displacement
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