期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到22,822篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Effect of Catalyst Concentration on the Properties of Bio-based Epoxy Vitrimer with Dynamically Adaptive Networks 认领 引用
1
作者 Wenyan Zhang Yuting Chu +1 位作者 Chuang Li Yao Fu 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第1期136-144,I0043,共9页
Epoxy resins are widely employed in wind turbine blades,drone rotors,and automotive interiors due to their excel-lent mechani-cal proper-ties and long service life.However,their insoluble and infusible cross-linked ne... Epoxy resins are widely employed in wind turbine blades,drone rotors,and automotive interiors due to their excel-lent mechani-cal proper-ties and long service life.However,their insoluble and infusible cross-linked networks pose a significant re-cycling challenge,particularly with the impending retirement of the first generation of wind turbine blades.In this work,we reported a fully bio-based epoxy Vitrimer(FEP)incorporat-ing a dual-dynamic covalent network design and systematically investigated the influence of the 1,5,7-triazabicyclo[4.4.0]dec-5-ene(TBD)catalyst on its curing kinetics,thermal/mechan-ical properties,dynamic exchange behavior,and degradation performance in a mild alkaline solution.Compared to conventional epoxy resins,FEP exhibited superior tensile strength and elongation at break at an optimal TBD concentration(2 wt%),achieving an excellent strength-toughness balance.The presence of TBD accelerated the exchange rates of both disulfide and ester bonds,endowing FEP with notable stress relaxation at elevated tempera-tures.Moreover,FEP demonstrated complete dissolution in 1 mol/L NaOH within 6 h at 25℃.These results underscored the exceptional strength,toughness,and recyclability of FEP,positioning it as a promising,environmentally friendly matrix resin for next-generation appli-cations in the new energy sector. 展开更多
关键词 Bio-based materials Epoxy Vitrimer Catalyst concentration Dynamically adaptive networks
暂未订购 下载PDF
Boosting the intermittent alkaline seawater electrolysis stability up to 10,000h via in-situ formation of dynamically passivating structures 认领 引用
2
作者 Bo Chen Peiyu Duan +1 位作者 Ying Zhang Lianhui Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第1期4-6,共3页
With the in-depth implementation of sustainable development strategies,hydrogen energy as a clean energy source is receiving increasing attention[1,2].Among the various methods of hydrogen production,the electrocataly... With the in-depth implementation of sustainable development strategies,hydrogen energy as a clean energy source is receiving increasing attention[1,2].Among the various methods of hydrogen production,the electrocatalytic decomposition of abundant seawater into hydrogen utilizing renewable energy has emerged as a green and promising approach.However,natural seawater contains complex components,such as halide ions,which lead to the corrosion of catalysts or the occurrence of competitive side reactions during the electrolysis process[3]. 展开更多
关键词 intermittent alkaline seawater electrolysis electrocatalytic decomposition renewable energy clean energy source sustainable development strategies halide ionswhich sustainable development strategieshydrogen energy dynamically passivating structures
暂未订购 下载PDF
Quantification of dynamically inhomogeneous acoustoplastic effect on rolling process of superalloy thin-walled complex-section ring 认领 引用
3
作者 Guangda SHAO Hongwei LI +1 位作者 Mei ZHAN Zhiyu XIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第7期609-620,共12页
Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an... Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an Ultrasonic Vibration-Assisted(UVA)rolling process,where Ultrasonic Vibration(UV)was applied to ring via feed roller.However,circumferential rotation and structural variation of the ring induce dynamically inhomogeneous acoustoplastic effect,thereby complicating process prediction and control.To this problem,a quantification method comprising three key components was proposed:(ⅰ)an acoustoplastic constitutive model related to Acoustic Energy Density(AED)to describe the ring's mechanical re sponse,(ⅱ)a Gaussian function to model the circumferential AED distribution,(ⅲ)a cyclic coupling calculation framework of ultrasonic and deformation fields to capture the axial AED evolution.Using this method,an UVA rolling finite element model of W-section ring was established to reveal the evolution of AED and its influence on deformation.Radial UV concentrates energy in contact zones,exacerbating localized thinning,while axial UV induces uniform AED,suppressing thinning and springback.A spatiotemporal matching strategy of ultrasonic and deformation fields was finally proposed to improve deformation behavior during rolling forming.This work offers a new approach for high-performance manufacturing of thin-walled complex-section rings. 展开更多
关键词 Dynamically inhomogeneous acoustoplastic effect Finite element method Process control Thin-walled complex-section ring Ultrasonic vibration-assisted rolling
暂未订购 下载PDF
Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content 认领 引用
4
作者 Jun-Jin Duan Yan-Qin Huang +3 位作者 Fu-Qing Wei Yan Gao Fu-Shan Wang Jia-Chun Feng 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第1期87-99,I0011,共13页
Dynamic melt modification of polyethylene via the direct grafting of peroxide fragments shows promise for the development of processable functionalized materials.In this study,four linear low-density polyethylenes(LLD... Dynamic melt modification of polyethylene via the direct grafting of peroxide fragments shows promise for the development of processable functionalized materials.In this study,four linear low-density polyethylenes(LLDPEs)with comparable molecular weights but different short-chain branch(SCB)contents(ranging of 5-66 per 1000 carbon atoms)were modified via dynamic melt mixing using 2 wt% benzoyl peroxide at 145℃ and 50 r/min for 30 min.The influence of SCB content on the processability and structure of the resulting products was systematically investigated.All modified products exhibited good melt processability with melt flow rates(MFR)ranging from 0.46 g/10min to 1.07 g/10min.Products derived from low-SCB LLDPEs showed a lower MFR,higher cross-linking content,a larger number of long-chain branches,and a higher degree of benzoyl grafting.In contrast,those produced from high-SCB LLDPEs exhibited improved processability,reduced cross-linking,fewer long-chain branches,and lower benzoyl grafting levels.A detailed structural investigation of the soluble and insoluble fractions,which were separated using trichlorobenzene fractionation,was conducted to analyze the structural features of various modified products and demonstrate that the SCB content(i.e.,tertiary carbon density)significantly influences radical coupling during dynamic modification.Elevated tertiary carbon density,by introducing greater steric hindrance,suppresses radical coupling during dynamic modification,thereby reducing the efficiency of both crosslinking and peroxide fragment grafting.These findings provide new insights into the structure-reactivity relationships in peroxide-induced polyethylene modification and lay the foundation for tailoring material properties via dynamic processing. 展开更多
关键词 Polyethylene Peroxide Short-chain branching Dynamical modification Processability
暂未订购 下载PDF
Bromide-driven reorganization of lithium solvation shells enables dynamically decoupled ion transport and interfacial stability in semi-solid polymer electrolytes for lithium metal batteries 认领 引用
5
作者 Li Niu Runhong Wei +2 位作者 Yanlei Zhang Jinhai You Michael Wübbenhorst 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第2期531-540,I0012,共10页
The performance of polymer electrolytes in lithium metal batteries(LMBs)is often hindered by strong Li+-ligand coordination,which leads to tightly bound solvation shells and restricts ion transport by coupling it t... The performance of polymer electrolytes in lithium metal batteries(LMBs)is often hindered by strong Li+-ligand coordination,which leads to tightly bound solvation shells and restricts ion transport by coupling it to polymer segmental motion.In this study,a low-content ionic plasticizer additive1-butyl-3-dimethylimidazolium bromide(BMImBr)was introduced into the PVDF-HFP/LiTFSI/DMF matrix to modulate the Li+solvation environment.Unlike conventional dual-salt systems,the introduced Br-anions dynamically compete for Li+coordination,disrupting the rigid Li+-TFSI-/DMF solvation shell and constructing a"statistically labile and diffuse ionic cloud"characterized by reduced coordination numbers,weakened binding energies,and a more diffuse electrostatic potential landscape.This restructured solvation environment facilitates partially decoupled Li+transport,as evidenced by dielectric spectroscopy and molecular dynamics simulations.Furthermore,the in situ formation of a LiBr-rich solid electrolyte interphase(SEI)effectively stabilizes the Li-metal interface and significantly reduces interfacial resistance.As a result,the optimized polymer electrolyte delivers outstanding electrochemical performance,achieving a high ionic conductivity of 0.8×10-4 S/cm,ultra-stable symmetric cell cycling over 500 h,and superior capacity retention exceeding 94%after 150 cycles at 0.5 C.This study elucidates a dynamic ion transport mechanism driven by competitive anion coordination and provides a viable strategy for simultaneously addressing the conductivity-stability trade-off in solid-state lithium metal batteries. 展开更多
关键词 Dynamic solvation structure Segmental decoupling Polymer electrolyte LiBr-rich SEI Lithium metal batteries
暂未订购 下载PDF
Thermodynamically stable Mg2XH6(X=Al,Si)double perovskite hydrides for high-capacity hydrogen storage:A DFT and AIMD study 认领 引用
6
作者 Abdelghafour El Mekkaouy Abdellah Hammad +5 位作者 Asif Nawaz Khan Najat Gaidi Tesfaye Abebe Geleta Younes Mekki Muhammad Usman Rodouan Touti 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第7期369-386,共18页
The escalating worldwide demand for decarbonized energy systems has led to hydrogen being established as a leading candidate owing to its high specific energy and environmentally benign combustion profile.Among the ad... The escalating worldwide demand for decarbonized energy systems has led to hydrogen being established as a leading candidate owing to its high specific energy and environmentally benign combustion profile.Among the advanced materials for solid-state hydrogen storage,double perovskite hydrides of Mg2XH6(X=Al/Si)are a promising class of lightweight compounds.Using density functional theory,this study presents a comprehensive computational analysis of the structural,elastic,mechanical,electronic,optical,thermodynamic,and vibrational properties.Moreover,their thermal stability,finite-temperature dynamics via molecular dynamics simulations,and hydrogen-storage performance were evaluated.Tolerance factor calculations revealed that these hydrides adopt stable cubic perovskite configurations,with their negative formation enthalpies providing additional evidence of thermodynamic stability.All hydrides satisfy Born’s mechanical stability criteria and exhibit high stiffness,superior mechanical strength,enhanced hardness,shear resistance,and ductile mechanical characteristics.Electronic band structure calculations demonstrate that both Mg2AlH6 and Mg2SiH6 exhibit metallic behavior using the generalized gradient approximation(GGA)based on the Perdew–Burke–Ernzerhof(PBE)exchange–correlation functional.Optical analysis revealed a strong dielectric response,pronounced light–matter interaction,and high optical conductivity,along with superior absorption and excellent photonic performance.Phonon dispersion analysis confirmed the dynamic stability of these compounds.Their thermodynamic parameters and high melting points highlight their overall stability and attractive properties.Furthermore,ab initio molecular dynamics(AIMD)simulations provide compelling evidence of the robust thermal stability of these compounds under realistic conditions.Beyond these attributes,assessments of hydrogen storage capacity exhibit impressive gravimetric contents of 7.41 wt%for Mg2AlH6 and 7.31 wt%for Mg2SiH6 values that exceed the U.S.Department of Energy(DOE)2025 target of 5.5 wt%.These results highlight the strong potential of these compounds as high-capacity hydrogen-storage materials. 展开更多
关键词 Double perovskite hydrides Solid-state hydrogen storage Ab initio molecular dynamics Mechanical and thermodynamic stability Hydrogen desorption temperature
暂未订购 下载PDF
Dynamically Tunable THz Focusing via Mechanically Rotatable Cascaded Metasurfaces With Polarization Multiplexing 认领 引用 被引量：1
7
作者 Hui Li Wenhui Xu +5 位作者 Hang Xu Jie Li Chunyu Song Qun Ren Yang Ren Jianquan Yao 《SmartSys》 2025年第3期1-9,共9页
Dynamically tunable terahertz(THz)beam focusing plays a critical role in emerging applications including reconfigurable imaging,localized spectral analysis,and micro-machining.Conventional methods,however,frequently e... Dynamically tunable terahertz(THz)beam focusing plays a critical role in emerging applications including reconfigurable imaging,localized spectral analysis,and micro-machining.Conventional methods,however,frequently employ complex wavefront modulators and external control algorithms,resulting in increased system footprint and limited tuning efficiency.In this work,we present an all-silicon mechanically rotatable cascaded metasurface capable of dynamic THz beam focusing.By independently adjusting the relative rotation angles between the two metasurface layers,real-time repositioning of the focal spot is achieved for orthogonal circular polarization channels.The proposed design facilitates polarization-division multiplexing without requiring external algorithms or active materials while preserving high focusing efficiency and beam quality across a predefined focal plane.Numerical simulations reveal a quasi-linear shift of the focal position with the rotation angle,with stable focusing efficiency and full-width at half-maximum observed in both polarization channels.This strategy offers an efficient and reliable approach to dynamic wavefront control for compact,reconfigurable THz imaging,sensing,and communication systems. 展开更多
关键词 cascaded metasurface dynamic beam focusing polarization-division multiplexing terahertz wavefront control
暂未订购 下载PDF
A Knowledge Push Method of Complex Product Assembly Process Design Based on Distillation Model-Based Dynamically Enhanced Graph and Bayesian Network 认领 引用 被引量：1
8
作者 Fengque Pei Yaojie Lin +2 位作者 Jianhua Liu Cunbo Zhuang Sikuan Zhai 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2025年第6期117-134,共18页
Under the paradigm of Industry 5.0,intelligent manufacturing transcends mere efficiency enhancement by emphasizing human-machine collaboration,where human expertise plays a central role in assembly processes.Despite a... Under the paradigm of Industry 5.0,intelligent manufacturing transcends mere efficiency enhancement by emphasizing human-machine collaboration,where human expertise plays a central role in assembly processes.Despite advancements in intelligent and digital technologies,assembly process design still heavily relies on manual knowledge reuse,and inefficiencies and inconsistent quality in process documentation are caused.To address the aforementioned issues,this paper proposes a knowledge push method of complex product assembly process design based on distillation model-based dynamically enhanced graph and Bayesian network.First,an initial knowledge graph is constructed using a BERT-BiLSTM-CRF model trained with integrated human expertise and a fine-tuned large language model.Then,a confidence-based dynamic weighted fusion strategy is employed to achieve dynamic incremental construction of the knowledge graph with low resource consumption.Subsequently,a Bayesian network model is constructed based on the relationships between assembly components,assembly features,and operations.Bayesian network reasoning is used to push assembly process knowledge under different design requirements.Finally,the feasibility of the Bayesian network construction method and the effectiveness of Bayesian network reasoning are verified through a specific example,significantly improving the utilization of assembly process knowledge and the efficiency of assembly process design. 展开更多
关键词 Complex product assembly process Large language model Dynamic incremental construction of knowledge graph Bayesian network Knowledge push
暂未订购 下载PDF
Dynamically and economically updating the National Elevation Datum with the assistance of InSAR:A case study in North China Plain 认领 引用
9
作者 Wenke Zheng Zhaofeng Du +2 位作者 Xiaomin Zhou Cong Yue Shengtao Qin 《Geodesy and Geodynamics》 EI CSCD 2025年第3期310-320,共11页
Land subsidence significantly impacts the accuracy of the National Elevation Datum in China.In order to solve this issue,a dynamic and economical way was proposed to update the National Elevation Datum with the assist... Land subsidence significantly impacts the accuracy of the National Elevation Datum in China.In order to solve this issue,a dynamic and economical way was proposed to update the National Elevation Datum with the assistance of InSAR in the North China Plain,which served as the research area.Moreover,the GNSS result was used to correct the InSAR result for the vertical deformation field,which has a relatively unified deformation reference.By integrating the vertical deformation field with the national elevation control point,an analysis and evaluation of changes in the National Elevation Datum were conducted.In addition,a regional remeasurement scheme was formulated to achieve dynamic updates and mainte-nance of the National Elevation Datum on a regional scale.Through data acquisition and processing,we successfully improved reliability within the main subsidence areas for future use.As a result,updating the elevation values utilize a regional update method,and a dynamic and economical technical process to update the National Elevation Datum is shown in the study. 展开更多
关键词 InSAR Land subsidence National Elevation Datum Dynamic update Regional remeasurement
暂未订购 下载PDF
Exploring superconductivity in dynamically stable carbon-boron clathrates trapping molecular hydrogen 认领 引用
10
作者 Akinwumi Akinpelu Mangladeep Bhullar +1 位作者 Timothy A.Strobel Yansun Yao 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第3期131-140,共10页
The recent discovery of type-Ⅶboron-carbon clathrates with calculated superconducting transition temperatures approaching~100 K has sparked interest in exploring new conventional superconductors that may be stabilize... The recent discovery of type-Ⅶboron-carbon clathrates with calculated superconducting transition temperatures approaching~100 K has sparked interest in exploring new conventional superconductors that may be stabilized at ambient pressure.The electronic structure of the clathrate is highly tunable based on the ability to substitute different metal atoms within the cages,which may also be large enough to host small molecules.Here we introduce molecular hydrogen(H2)within the clathrate cages and investigate its impact on electron-phonon coupling interactions and the superconducting transition temperature(Tc).Our approach involves combining molecular hydrogen with the new diamond-like covalent framework,resulting in a hydrogen-encapsulated clathrate,(H2)B3C3.A notable characteristic of(H2)B3C3is the dynamic behavior of the H2molecules,which exhibit nearly free rotations within the B-C cages,resulting in a dynamic structure that remains cubic on average.The static structure of(H2)B3C3(a snapshot in its dynamic trajectory)is calculated to be dynamically stable at ambient and low pressures.Topological analysis of the electron density reveals weak van der Waals interactions between molecular hydrogen and the B-C cages,marginally influencing the electronic structure of the material.The electron count and electronic structure calculations indicate that(H2)B3C3is a hole conductor,in which H2molecules donate a portion of their valence electron density to the metallic cage framework.Electron-phonon coupling calculation using the Migdal-Eliashberg theory predicts that(H2)B3C3possesses a Tc of 46 K under ambient pressure.These results indicate potential for additional light-element substitutions within the type-Ⅶclathrate framework and suggest the possibility of molecular hydrogen as a new approach to optimizing the electronic structures of this new class of superconducting materials. 展开更多
关键词 superconductivity electronic structure density functional theory molecular dynamics
暂未订购 下载PDF
Hepatocyte nuclear factors dynamically regulate triglyceride metabolic reprogramming in metabolic dysfunction-associated steatotic liver disease:Mechanisms and implications 认领 引用
11
作者 Su-Qun Li Jin-Hua Wu +8 位作者 Ying Zhou Chen-Xi Wang Li Xie Si-Ying Liu Yu-Zhi Su Wei He Huan Chen Wei-Wei Zhong Yi-Huai He 《World Journal of Hepatology》 2025年第10期60-84,共25页
Metabolic dysfunction-associated steatotic liver disease,characterized by pathological intracellular triglyceride(TG)accumulation,is mechanistically associated with the disrupted spatiotemporal regulation of hepatocyt... Metabolic dysfunction-associated steatotic liver disease,characterized by pathological intracellular triglyceride(TG)accumulation,is mechanistically associated with the disrupted spatiotemporal regulation of hepatocyte nuclear factor(HNF)-dependent transcriptional programs.HNFs,including key members such as HNF-1α,HNF-4α,and HNF-6,constitute a liver-enriched family of transcription factors that govern hepatic lipid metabolism through hierarchical transcriptional regulatory networks.These networks critically regulate the dynamic equilibrium of TG metabolism,encompassing TG synthesis,storage,lipolysis,and lipoprotein-mediated export.This review comprehensively deciphers the molecular cascades through which HNF dysfunction exacerbates TG metabolic disorder in metabolic dysfunction-associated steatotic liver disease.Additionally,we evaluate emerging translational strategies targeting key HNF regulatory nodes and discuss current clinical challenges as well as potential solutions. 展开更多
关键词 Hepatocyte nuclear factors Metabolic dysfunction-associated steatotic liver disease Triglyceride metabolic imbalance Dynamic dysregulation of transcriptional networks Clinical translation
暂未订购 下载PDF
Dynamically compressive behaviors and plastic mechanisms of a CrCoNi medium entropy alloy at various temperatures 认领 引用 被引量：6
12
作者 Kun Jiang Jianguo Li +3 位作者 Bin Gan Tian Ye Lianyang Chen Tao Suo 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第5期88-96,I0002,共9页
As an attractive class of metallic materials,single-phase CrCoNi medium-entropy alloy(MEA)has drawn much attention recently regarding their deformation behaviors,but the dynamically mechanical responses of this alloy ... As an attractive class of metallic materials,single-phase CrCoNi medium-entropy alloy(MEA)has drawn much attention recently regarding their deformation behaviors,but the dynamically mechanical responses of this alloy at high strain rates remain less studied,especially coupled with extremely low temperatures.In this study,the dynamic deformation behaviors of this CrCoNi MEA were systematically investigated at room temperature(RT)of 298 K and liquid nitrogen temperature(LNT)of 77 K using the split Hopkinson pressure bar(SHPB).This alloy exhibited a combination of higher yield strength and stronger hardening rate upon dynamic compressive deformation when the loading conditions become much harsher(higher strain rate or lower temperature).Detailed microstructure analyses indicated that the strong strain hardening ability during dynamic deformation was mainly attributed to the continuous formation of nanoscale deformation twins.Furthermore,as loaded at LNT,multi-directional deformation twins were activated.Meanwhile,due to the interaction between Shockley partial dislocations and twin boundaries,large-sized deformation-induced FCC-HCP phase transformations at a micrometer scale were also observed within the grains,which not only accommodated the plasticity but also played an important role in improving the hardening capability owing to the appearance of newly generated interfaces. 展开更多
关键词 Medium entropy alloys Extreme loading Dynamically compressive deformation Nanotwins Phase transformation
暂未订购 下载PDF
Coherent control of negative refraction based on local-field enhancement and dynamically induced chirality 认领 引用 被引量：3
13
作者 巴诺 高金伟 +2 位作者 田杏霞 吴熙 吴金辉 《Chinese Physics B》 SCIE EI CAS 2010年第7期284-291,共8页
This paper studies the electromagnetic response of a coherently driven dense atomic ensemble to a weak probe. It finds that negative refraction with little absorption may be achieved in the presence of local-field enh... This paper studies the electromagnetic response of a coherently driven dense atomic ensemble to a weak probe. It finds that negative refraction with little absorption may be achieved in the presence of local-field enhanced interaction and dynamically induced chirality. The complex refractive index governing the probe refraction and absorption depends critically on the atomic density, the steady population distribution, the coherence dephasings, and the frequency de- tunings, and is also sensitive to the phase of the driving field because the photonic transition paths form a close loop. Thus, it can periodically tune the refractive index at a fixed frequency from negative to positive values and vice versa just by modulating the driving phase. Moreover, the optimal negative refraction is found to be near the probe magnetic resonance, which then requires the electric fields of the probe and the drive being on two-photon resonance due to the dipole synchronisation. 展开更多
关键词 negative refraction dynamically induced chirality local field enhancement electromag-netically induced transparency
暂未订购 下载PDF
Welding of Ti-6Al-4V alloy using dynamically controlled plasma arc welding process 认领 引用 被引量：4
14
作者 陈建春 潘春旭 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1506-1512,共7页
A novel dynamically controlled plasma arc welding process was introduced,which is able tominimize heat input into the workpiece materials while maintaining desired full penetration,and it was used to weld Ti-6Al-4V al... A novel dynamically controlled plasma arc welding process was introduced,which is able tominimize heat input into the workpiece materials while maintaining desired full penetration,and it was used to weld Ti-6Al-4V alloy sheets.The microstructures,facture surfaces and microhardness of the welded joints were characterized by using optical microscope,scanning electron microscope （SEM） and Vickers microhardness tester.Comparing with welds such as gas tungsten arc and conventional plasma arc processes,the experimental results revealed the improvements when using the present process including：1） reducing prior-beta （β） grain size and prohibiting formation of hard martensite phases in the fusion zone due to the decreased heat input;and 2） better toughness and higher hardness. 展开更多
关键词 dynamically controlled plasma arc welding Ti alloy welding microstructure fracture microhardness
暂未订购 下载PDF
Dynamically loading IFC models on a web browser based on spatial semantic partitioning 认领 引用 被引量：2
15
作者 Hong-Lei Lu Jia-Xing Wu +1 位作者 Yu-Shen Liu Wan-Qi Wang 《Visual Computing for Industry,Biomedicine,and Art》 EI 2019年第1期26-37,共12页
Industry foundation classes(IFC)is an open and neutral data format specification for building information modeling(BIM)that plays a crucial role in facilitating interoperability.With increases in web-based BIM applica... Industry foundation classes(IFC)is an open and neutral data format specification for building information modeling(BIM)that plays a crucial role in facilitating interoperability.With increases in web-based BIM applications,there is an urgent need for fast loading large IFC models on a web browser.However,the task of fully loading large IFC models typically consumes a large amount of memory of a web browser or even crashes the browser,and this significantly limits further BIM applications.In order to address the issue,a method is proposed for dynamically loading IFC models based on spatial semantic partitioning(SSP).First,the spatial semantic structure of an input IFC model is partitioned via the extraction of story information and establishing a component space index table on the server.Subsequently,based on user interaction,only the model data that a user is interested in is transmitted,loaded,and displayed on the client.The presented method is implemented via Web Graphics Library,and this enables large IFC models to be fast loaded on the web browser without requiring any plug-ins.When compared with conventional methods that load all IFC model data for display purposes,the proposed method significantly reduces memory consumption in a web browser,thereby allowing the loading of large IFC models.When compared with the existing method of spatial partitioning for 3D data,the proposed SSP entirely uses semantic information in the IFC file itself,and thereby provides a better interactive experience for users. 展开更多
关键词 Building information modelling Industry foundation classes IFC models Dynamically loading online
暂未订购 下载PDF
A Statistical Parameter Analysis and SVM Based Fault Diagnosis Strategy for Dynamically Tuned Gyroscopes 认领 引用 被引量：2
16
作者 徐国平 田蔚风 +1 位作者 金志华 钱莉 《Journal of Shanghai Jiaotong university(Science)》 EI 2007年第5期592-596,共5页
Gyro's fault diagnosis plays a critical role in inertia navigation systems for higher reliability and precision. A new fault diagnosis strategy based on the statistical parameter analysis (SPA) and support vector ... Gyro's fault diagnosis plays a critical role in inertia navigation systems for higher reliability and precision. A new fault diagnosis strategy based on the statistical parameter analysis (SPA) and support vector machine (SVM) classification model was proposed for dynamically tuned gyroscopes (DTG). The SPA, a kind of time domain analysis approach, was introduced to compute a set of statistical parameters of vibration signal as the state features of DTG, with which the SVM model, a novel learning machine based on statistical learning theory (SLT), was applied and constructed to train and identify the working state of DTG. The experimental results verify that the proposed diagnostic strategy can simply and effectively extract the state features of DTG, and it outperforms the radial-basis function (RBF) neural network based diagnostic method and can more reliably and accurately diagnose the working state of DTG. 展开更多
关键词 statistical parameter analysis （SPA） support vector machine （SVM） radial-basis function （RBF）neural network fault diagnosis dynamically tuned gyroscope
暂未订购 下载PDF
Field structure at mode Ⅲ dynamically propagating crack tip in elastic-viscoplastic materials 认领 引用
17
作者 贾斌 王振清 李永东 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2008年第7期919-925,共7页
An elastic-viscoplastic mechanics model is used to investigate asymptotically the mode Ⅲ dynamically propagating crack tip field in elastic-viscoplastic materials. The stress and strain fields at the crack tip posses... An elastic-viscoplastic mechanics model is used to investigate asymptotically the mode Ⅲ dynamically propagating crack tip field in elastic-viscoplastic materials. The stress and strain fields at the crack tip possess the same power-law singularity under a linear-hardening condition. The singularity exponent is uniquely determined by the viscosity coefficient of the material. Numerical results indicate that the motion parameter of the crack propagating speed has little effect on the zone structure at the crack tip. The hardening coefficient dominates the structure of the crack-tip field. However, the secondary plastic zone has little influence on the field. The viscosity of the material dominates the strength of stress and strain fields at the crack tip while it does have certain influence on the crack-tip field structure. The dynamic crack-tip field degenerates into the relevant quasi-static solution when the crack moving speed is zero. The corresponding perfectly-plastic solution is recovered from the linear-hardening solution when the hardening coefficient becomes zero. 展开更多
关键词 elastic-viscoplastic materials, dynamically propagating crack, mode Ⅲ crack, crack tip field zone structure
暂未订购 下载PDF
FSM deconposition VLSI architecture for dynamically reconfiguration 认领 引用
18
作者 毛志刚 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第3期251-254,共4页
While some applications in memory can be constrained by memory bandwidth and memory cost, this paper proposes a transformation of the application into a one-bit FSM. When the finite state machine is very large, one wa... While some applications in memory can be constrained by memory bandwidth and memory cost, this paper proposes a transformation of the application into a one-bit FSM. When the finite state machine is very large, one way to improve the area and delay efficiently is to break down the large finite state machine into many smaller machines. The area efficiency can be improved if fewer machines are active simultaneously in the pipelined architecture. This can be achieved when using dynamic reconfiguration to map several sub machines onto the same hardware. This paper presents a methodology to break down the large finite state machine into many smaller machines and an architecture for the dynamically reconfiguration. 展开更多
关键词 FSM FPGA dynamically reconfigurable hardware break down reconfiguration time
暂未订购 下载PDF
Dynamically Reconfigurable Encryption System of the AES 认领 引用
19
作者 WANG Youren WANG Li YAO Rui ZHANG Zhai CUI Jiang 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第6期1569-1572,共4页
Reconfigurable computing has grown to become an important and large field of research, it offers advantages over traditional hardware and software implementations of computational algorithms. The Advanced Encryption S... Reconfigurable computing has grown to become an important and large field of research, it offers advantages over traditional hardware and software implementations of computational algorithms. The Advanced Encryption Standard （AES） algorithm is widely applied in government department and commerce. This paper analyzed the AES algorithms with different cipher keys, adopted a novel key scheduler that generated the round key real-time, proposed a dynamically reconfigurable encryption system which supported the AES algorithm with different cipher keys, and designed the architecture of the reconfigurable system. The dynamically reconfigurable AES system had been realized on FPGA. The result proves that the reconfigurable AES system is flexible, lower cost and high security level. 展开更多
关键词 dynamically reconfigurable hardware field programmable gate array （FPGA） advanced encryption standard （AES） algorithm cipher key
暂未订购 下载PDF
Error Analysis of a Dynamically Tuned Gyro Strapdown Northfinder  认领 引用 被引量：13
20
作者 齐宇同 陈峰浴 苏海滨 《Journal of Beijing Institute of Technology》 EI CAS 1999年第3期331-336,共6页
Aim To analyze the mathematical error model of a dynamically tuned gyro (DTG) strapdown northfinder in detail, guide the process of design, manufacture and adjustment of northfinder. Methods Each error source of this ... Aim To analyze the mathematical error model of a dynamically tuned gyro (DTG) strapdown northfinder in detail, guide the process of design, manufacture and adjustment of northfinder. Methods Each error source of this type of northfinder was determined, and the influence of each source on northfinding result was formulated. Results and Conclusion Under the guidance of the analysis, select relevant method for each source which has different effect on result to reduce northfinding error, a type of northfinder meeting the practical requirements of user was developed. 展开更多
关键词 northfinder strapdown dynamically tuned gyro (DTG) error
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈