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Processability and Structure of Dynamically Modified Linear Low-density Polyethylene with Different Branching Contents Using a High Peroxide Content 认领 引用
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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
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Laser powder bed fusion of Zr-modified Al-Cu-Mg alloy:Processability and elevated-temperature mechanical properties 认领 引用 被引量：6
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作者 Yanfang Wang Xin Lin +4 位作者 Yufan Zhao Zihong Wang Xiaobin Yu Xuehao Gao Weidong Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第5期223-235,共13页
Zr modification is an effective method for improving hot-cracking resistance and elevated-temperature mechanical properties during laser powder bed fusion(L-PBF)of traditional medium and high strength wrought aluminum... Zr modification is an effective method for improving hot-cracking resistance and elevated-temperature mechanical properties during laser powder bed fusion(L-PBF)of traditional medium and high strength wrought aluminum alloys.This study investigated the l-PBF processability and elevated-temperature mechanical properties of a Zr-modified 2024Al alloy.It was found that the hot-cracking susceptibility increased with the increased scanning speed,which was in reasonable agreement with the modified Rappaz-Drezet-Gremaud criterion.Furthermore,the primary L12-Al3Zr precipitates,which acted as ef-ficient nucleation sites,precipitated at the fusion boundary of the melt pool,leading to the formation of a heterogeneous grain structure.The yield strength(YS)of the as-fabricated samples at 150,250,and 350℃was 363,210,and 48 MPa,respectively.Despite the slight decrease to 360 MPa of the YS when tested at 150℃,owing to the additional precipitate strengthening from the L12-Al3Zr precipitates,the YS achieved yield strengths of 253 and 69 MPa,an increase of 20.5%and 30.4%,when tested at 250 and 350℃,respectively.The yield strengths in both the as-fabricated and T6-treated conditions tested at 150 and 250℃were comparable to those of casting Al-Cu-Mg-Ag alloys and superior to those of traditionally heat-resistant 2219-T6 and 2618-T6 of Al-Cu alloys. 展开更多
关键词 Laser powder bed fusion Zirconium Al-Cu-Mg alloy Processability Elevated-temperature mechanical property
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Sub-5 nm porous polymer decoration toward superhydrophobic MOFs with enhanced stability and processability 认领 引用
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作者 Siyi Rong Pengcheng Su +2 位作者 Shizheng Chen Miaomiao Jia Wanbin Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第4期2134-2138,共5页
Metal-organic frameworks(MOFs) show great potential for various applications, but many of them suffer from the drawbacks of hydrolysis propensity and poor processability. Herein, we employ polymers of intrinsic microp... Metal-organic frameworks(MOFs) show great potential for various applications, but many of them suffer from the drawbacks of hydrolysis propensity and poor processability. Herein, we employ polymers of intrinsic microporosity(PIMs) with hydrophobic pores to decorate MOFs toward substantially improved water stability and shapeability. Through simple PIM-1 decoration, the sub-5 nm polymer layers can be uniformly deposited on MOF surfaces with almost no deterioration in porosity. Owing to the existence of superhydrophobic coating and the obstruction of water entrance into MOFs, the PIM-1 coated Cu BTC exhibits impressive water resistance and excellent pore preservation ability after exposure in water, even in acidic and alkaline solutions. Moreover, polymer decoration improves the processability of MOFs, while various MOF/PIM-1 bulk wafers and oil-water separators can be obtained straightforwardly. 展开更多
关键词 Metal-organic framework Porous polymer decoration Hydrophobicity Stability Processability
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Exploring the Developmental Stages of Amharic Nominal and Verbal Gender:Evidence for processability theory 认领 引用 被引量：1
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作者 Henok Alemu Derib Ado 《宏观语言学》 2022年第1期36-76,共41页
The purpose of this article is twofold.First,it explores the order of the development of nominal and verbal gender of Amharic,which is one of the Ethio-Semitic languages.Second,it provides empirical evidence for the t... The purpose of this article is twofold.First,it explores the order of the development of nominal and verbal gender of Amharic,which is one of the Ethio-Semitic languages.Second,it provides empirical evidence for the typological plausibility of processability theory(PT).In fact,PT has been tested in typologically different languages(e.g.,English,Italian,and Japan);however,it does not have any validation from Ethiopian languages in general and Ethio-Semitic languages in particular yet.Relevant data was collected from sixteen respondents via picture description tasks,short storytelling,interviews,story re-telling,and spot the difference tasks.Distributional analysis was conducted for the analysis,and the point of emergence of target structures was determined using the emergence criteria.Accordingly,the result shows that the development of gender assignment is compatible with processability theory’s predictions in that lexical procedure precedes phrasal procedure,which is followed by S-procedure.Moreover,the masculine gender emerged earlier than its feminine counterpart at all developmental stages.However,subject agreement markers in pro-drop context emerged at stage two preceding subject verb agreement.This finding is against processability theory’s claim that suggests subject agreement markers only emerge at stage four of the processability hierarchy disregarding their stages of development in pro-drop context in particular. 展开更多
关键词 processability theory gender agreement developmental stages morpho syntax Amharic interlanguage
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Improving efficiency,air-processability,and stability of organic solar cells with cyclosiloxane additives 认领 引用
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作者 Yuntong Yang Xing Chen +4 位作者 Zesheng Zhang Mingqing Chen Lianjie Zhang Dongge Ma Junwu Chen 《Science China Chemistry》 SCIE EI CAS CSCD 2026年第3期1391-1401,共11页
Achieving long-term stability and scalable manufacturing under ambient conditions is crucial for the advancement of organic solar cells(OSCs).Additive engineering has proven effective in optimizing active layer morpho... Achieving long-term stability and scalable manufacturing under ambient conditions is crucial for the advancement of organic solar cells(OSCs).Additive engineering has proven effective in optimizing active layer morphology and improving device performance.In this study,we systematically investigated the effects of three cyclosiloxane additives(c-3 Si,c-4 Si,and c-5 Si)for the first time.Due to enhanced crystallinity,optimal phase separation,and improved charge carrier dynamics,the c-5 Si-processed device exhibited the champion efficiency,outperforming those of control,c-3 Si and c-4 Si devices.Specifically,the PM6:Y6-based device with c-5 Si treatment achieved an impressive PCE of 18.26%.Furthermore,c-5 Si processed PM6:L8-BO and D18:L8-BO active layers showed PCEs of 19.35%and 19.70%,respectively,highlighting their universal potential for high-performance devices.Additive c-5 Si improved OSC stability,significantly extending the T80lifetime from 43 to 205 h under 80℃heating and one sun illumination in the meantime.Additive c-5 Si also enabled the fabrication of high-performance active layers under high-humidity conditions(90%RH),providing an effective solution for air processing of OSCs.This work provides a simple yet effective strategy involving cyclosiloxane additives for manipulating active layer morphology,which advances the development of efficient,stable,and scalable OSCs for commercial applications. 展开更多
关键词 organic solar cells cyclosiloxane additives active layer morphology air processing stability
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Strategies for enhancing the processability of UHMWPE 认领 引用 被引量：4
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作者 Clement G.Collins Rice Alexander Evans +2 位作者 Zoë R.Turner Jirut Wattoom Dermot O'Hare 《Industrial Chemistry & Materials》 EI CSCD 2025年第2期178-190,共13页
Ultra-high molecular weight polyethylene(UHMWPE,Mw>106g mol−1)has been prepared using slurryphase titanium permethylindenyl-phenoxy(PHENI*)catalysts.Four strategies have been investigated for improving ... Ultra-high molecular weight polyethylene(UHMWPE,Mw>106g mol−1)has been prepared using slurryphase titanium permethylindenyl-phenoxy(PHENI*)catalysts.Four strategies have been investigated for improving the melt processability of UHMWPE,which is the chief limiting factor to the applications of this high-performance polymer.1)Active site engineering was used to explore the entanglement density in the resulting polymer,with substantially disentangled PE identified through thermal and rheological characterisation.2)Hydrogen and ZnEt2 were employed as chain transfer agents to modulate the polyethylene molecular weight and distribution(MWD).A sequential reactivity protocol using ZnEt2 was able to produce bimodal UHMWPE with improved processability.3)MWD tuning was further investigated using multisite catalysts,with the reaction conditions and Ti:Zr ratio able to control MWD to essentially arbitrary shapes.The inclusion of low molecular weight fractions into UHMWPE improves the processability without compromising mechanical characteristics.4)Polymer-reinforced composite blends of UHMWPE with either HDPE or LDPE as a highly processable matrix were extruded and explored,with polymer miscibility and mechanical properties studied in detail. 展开更多
关键词 Ultra-high molecular weight polyethylene Processability Molecular weight distribution Polymer composites Chain transfer agents.
Dynamic crosslinked polyurethane with readily processability and high strength based on the Diels-Alder reaction 认领 引用
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作者 Yuepeng Wang Bo Qian +4 位作者 Zihao Li Zekai Wu Yihan Wang Jiani Wu Zhengwei You 《Science China Chemistry》 SCIE EI CAS CSCD 2025年第11期5942-5948,共7页
There is usually a trade-off between the mechanical properties and processability of polymers because the mechanisms underlying these properties are mutually exclusive.Herein,we discovered that rationally designed cro... There is usually a trade-off between the mechanical properties and processability of polymers because the mechanisms underlying these properties are mutually exclusive.Herein,we discovered that rationally designed crosslinking can simultaneously enhance both the mechanical properties and processability of polymers.To achieve this,a dynamically dissociable crosslinker was designed using a reversible Diels-Alder reaction that forms a stable covalently crosslinked network from the linear polymer.During processing,the crosslinked network dissociates to release a small-molecule crosslinking agent,which increases the free volume of the polymer and weakens the non-covalent interactions between the molecular chains.Consequently,the polymer exhibits superior processing performance compared to its linear polymer counterpart.A polyurethane model was designed to demonstrate this strategy.After crosslinking,the strength and toughness of the polyurethane increased significantly compared to those of the linear polyurethane counterpart.Additionally,the solid-liquid transition temperature of the polyurethane decreased from 149℃ to 118℃,and the processing viscosity decreased by 48%.An application of this technology was demonstrated by producing fibers with the highest tensile strength(78.7 MPa)at the lowest processing temperature(125℃)reported for meltspun crosslinked fibers. 展开更多
关键词 covalent crosslinking processability fiber polyurethane
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Exceptional room-temperature processability of Ag2(S,Te)by iterative sublattice 认领 引用
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作者 Yumeng Wang Pengfei Qiu Xun Shi 《Science China Materials》 SCIE EI CAS CSCD 2025年第8期2990-2992,共3页
Inorganic semiconductors are widely used in many fields such as information,energy,and electronics due to their rich functionalities.The chemical bonds in inorganic semiconductors are usually directional covalent bond... Inorganic semiconductors are widely used in many fields such as information,energy,and electronics due to their rich functionalities.The chemical bonds in inorganic semiconductors are usually directional covalent bonds,which inhibit the movement of dislocations.Thus,being different with metals and alloys,inorganic semiconductors are usually brittle at room temperature,with very small strain below 1%and poor machinability[1].Many metalworking techniques,such as the cold-forming processing,which is a crucial means for the cost-effective production of metal and alloy parts,cannot be applied to most inorganic semiconductors,greatly limiting their low-cost fabrication and applications in flexible electronics. 展开更多
关键词 chemical bonds room temperature processability brittleness Ag Se Te inorganic semiconductors directional covalent bondswhich dislocation movement alloysinorganic semiconductors
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Multi-pass intermittent local loading process of large-scale rib-web component:Forming characteristics and implementing apparatus 认领 引用 被引量：3
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作者 Dawei ZHANG Peng DONG +2 位作者 Jingxiang LI Zijian YU Shengdun ZHAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期601-625,共25页
The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and redu... The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and reduce forming loads.However,the absence of compatible forming equipment makes it difficult to control the constraint in the unloaded zones during the forming process.This difficulty complicates coordination and control of deformation,particularly for asymmetric rib-web components.Additionally,the current implementation involves multi-fire heating,a long process flow,and high energy consumption,which limits the popularization and application of the local loading process.In this study,a new multi-pass local loading hydraulic forming apparatus that can quickly and reliably switch between heavy-load deformation and low-load constraint for different local loading sub-dies was developed.A 10-tonne laboratory prototype was developed,and the forming characteristics during the forming process as well as the response characteristics of the hydraulic system during the multi-pass intermittent local loading of rib-web component were investigated using numerical simulations and physical experiments.Results indicated that,compared to a whole loading process with the same initial geometry of billet,the total forming load(i.e.,the sum of loaded and restrained loads)is reduced by more than 40%with the local loading process,and by nearly 50%with multi-pass local loading.The multi-pass local loading process allows for more effective control of material flow compared to single-pass local loading,leading to improved cavity filling and reduced flow line disturbance.For a large-scale,complex titanium alloy bulkhead,the cavity filling problem was addressed by optimizing the multi-pass local loading path with an unequal thickness billet.The dynamic performance of the multi-pass local loading hydraulic system was found to be robust,with stable pressure transitions during motion and load switching for the sub-die(s).The dynamic characteristic of the hydraulic cylinder when switching from non-moving/unloaded state to a moving/loading state are consistent whether a load is present or not.However,the dynamic characteristics differ when switching from a moving/loading state to non-moving/unloaded state,showing opposite behavior.The developed hydraulic drive mechanism provides a way for implementation of multi-pass local loading without auxiliary operation and extra heating.The results of the study provide a foundation for the industrial production of large-scale,complex components with reduced force requirement and low-energy consumption. 展开更多
关键词 Forming characteristics Hydraulic system Intermittent local loading process Material flow Rib-web component
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Research Progress on Drying Technology and Process for GranularAgricultural Products 认领 引用 被引量：2
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作者 CHEN pengxiao XING Yanjia +3 位作者 WANG Xiaowan WANG Yankun ZHU Wenxue WEN Yunshou 《现代食品科技》 CAS 北大核心 2026年第6期416-431,共16页
Granular agricultural products constitute a staple food source for over 70%global population,are recognized as a core component within the food processing chain,and are accorded significant economic importance in inte... Granular agricultural products constitute a staple food source for over 70%global population,are recognized as a core component within the food processing chain,and are accorded significant economic importance in international trade.Inadequate desiccation during harvest seasons is associated with the facilitation of mold proliferation,induction of germination processes,and acceleration of product deterioration.These outcomes are manifested through compromised food security and incurred economic losses.Nevertheless,the porous structural characteristics inherent to granular crops,combined with the stress fission challenges encountered during dehydration processes,render alternative methods such as solarization and hot air drying frequently inadequate for meeting crop-specific drying requirements.In this study,the implementation and relative merits of microwave and infrared drying technologies for granular crops have been systematically examined.Subsequently,the enhanced drying efficiency and quality parameters achieved through microwave-hot air,infrared-hot air,and infrared-microwave hybrid drying systems are quantitatively demonstrated in comparison with conventional single-mode drying approaches.A comprehensive synthesis is presented regarding experimental findings and research priorities associated with microwave-vacuum,far-infrared vacuum,and fluidized bed drying applications.The developmental potential of emerging desiccation technologies-including radio frequency,ohmic,and heat pump-based systems-was critically evaluated through the comparative analysis of dehydration kinetics,energy efficiency metrics,and product quality indices.A theoretical framework was established for optimizing the novel drying equipment and operational parameters.This systematic investigation contributes substantively to the realization of energy-efficient,low-carbon,and quality-preserving drying objectives,thereby providing crucial technical support for global food security initiatives and sustainable agricultural practices. 展开更多
关键词 grain drying drying technology drying process quality energy consumption
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Statistical and experimental study of effects of process parameters on Ti-6Al-4V coaxial wire-feed laser cladding 认领 引用 被引量：2
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作者 Fan Liu Shaoshan Ji +2 位作者 Tuo Shi Shihong Shi Geyan Fu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期31-42,共12页
Three-beam wire-feed laser cladding,which generates a uniform energy distribution with a wire vertically fed into the molten pool,is a promising additive manufacturing technology.In this study,an experimental investig... Three-beam wire-feed laser cladding,which generates a uniform energy distribution with a wire vertically fed into the molten pool,is a promising additive manufacturing technology.In this study,an experimental investigation and a statistical analysis of Ti-6Al-4V wire cladding using three-beam laser coaxial wire-feed cladding technology coupled with a 2 kW continuous fiber laser were carried out.The influences of the main parameters,including the laser power,wire feeding speed,and laser scanning speed,on the cladding geometry and process were investigated.The prediction models correlating the process parameters and clad geometry were developed via the response surface methodology(RSM).The models were checked using analysis of variance(ANOVA).Through optimization,the optimal parameters were achieved for the required clad with a width-to-height ratio of 5:1.A high-speed camera was used to investigate the cladding process under various process parameters.The laser power positively affected the widths of the molten pool and cladding layer.The molten pool and clad heights decreased with increases in laser power and scanning speed.Fine acicular martensite grains in the colony and basket-weave distributions were predominant in the cross-section of the cladding layer.The macrostructure investigation showed that the widths of columnar prior-β grains decreased with the increase in laser scanning speed. 展开更多
关键词 Wire-feed laser cladding Geometry characteristics Ti-6Al-4V Cladding process Regression analysis Macrostructure and microstructure
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LLM-KE: An Ontology-Aware LLM Methodology for Military Domain Knowledge Extraction 认领 引用 被引量：2
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作者 Yu Tao Ruopeng Yang +3 位作者 Yongqi Wen Yihao Zhong Kaige Jiao Xiaolei Gu 《Computers, Materials & Continua》 SCIE EI 2026年第1期2045-2061,共17页
Since Google introduced the concept of Knowledge Graphs(KGs)in 2012,their construction technologies have evolved into a comprehensive methodological framework encompassing knowledge acquisition,extraction,representati... Since Google introduced the concept of Knowledge Graphs(KGs)in 2012,their construction technologies have evolved into a comprehensive methodological framework encompassing knowledge acquisition,extraction,representation,modeling,fusion,computation,and storage.Within this framework,knowledge extraction,as the core component,directly determines KG quality.In military domains,traditional manual curation models face efficiency constraints due to data fragmentation,complex knowledge architectures,and confidentiality protocols.Meanwhile,crowdsourced ontology construction approaches from general domains prove non-transferable,while human-crafted ontologies struggle with generalization deficiencies.To address these challenges,this study proposes an OntologyAware LLM Methodology for Military Domain Knowledge Extraction(LLM-KE).This approach leverages the deep semantic comprehension capabilities of Large Language Models(LLMs)to simulate human experts’cognitive processes in crowdsourced ontology construction,enabling automated extraction of military textual knowledge.It concurrently enhances knowledge processing efficiency and improves KG completeness.Empirical analysis demonstrates that this method effectively resolves scalability and dynamic adaptation challenges in military KG construction,establishing a novel technological pathway for advancing military intelligence development. 展开更多
关键词 Knowledge extraction natural language processing knowledge graph large language model
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Metallogenic mechanisms of three typical high-basicity sinter:Hematite-type,magnetite-type and vanadium-titanium magnetite-type 认领 引用 被引量：1
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作者 Bowen Duan Xiuli Han +3 位作者 Tianhang Si Shilong Fang Fengjiu Li Liangping Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第4期1126-1140,共15页
The mineral composition and microstructure critically affect high-basicity sinter quality.Using analytical grade reagents,the formation mechanisms of main minerals and microstructures in high-basicity sinter(hematite-... The mineral composition and microstructure critically affect high-basicity sinter quality.Using analytical grade reagents,the formation mechanisms of main minerals and microstructures in high-basicity sinter(hematite-type,magnetite-type,and vanadium-titanium magnetite-type)during mineralization were analyzed via polarized light microscopy and FactSage.The results indicated that hematite appeared as primary and secondary forms in different sinter types at 900℃.In the heating process,calcium ferrite,magnetite,and perovskite formed at 1150,1280,and 1400℃,respectively,while olivine formed at 1200℃during cooling.From room temperature to1400℃,microstructures evolved from powder-like to porphyritic and skeletal crystal forms.During cooling(1280 to 1100℃),an interlaced-erosion structure was observed.FactSage simulations show that in the low-temperature phase,the liquid composition is closer to the high-basicity CaO–Fe2O3liquid phase region,where silica-ferrite of calcium and aluminum(SFCA)binds with magnetite and hematite to form an interlaced-erosion structure.The porphyritic structure resulted from SFCA melting into the liquid phase,hematite decomposing,and the glass phase cementing magnetite upon quenching.The skeletal crystal structure forms during the high-temperature phase as the high silicate content in the liquid phase increases melting viscosity,reduces local medium concentration,and leads to incomplete crystal growth.This research aims to advance high-basicity sinter metallogenic theory and guide sintering quality improvement. 展开更多
关键词 high-basicity sinter mineralization process interlaced-erosion structure porphyritic structure skeletal crystal structure
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An Object Detection Algorithm Based on Deep Learning and Salient Feature Fusion for Roadside Surveillance Camera 认领 引用 被引量：1
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作者 Yang He Lisheng Jin +3 位作者 Huanhuan Wang Xinyu Sun Zhen Huo Guangqi Wang 《CAAI Transactions on Intelligence Technology》 SCIE EI CSCD 2026年第1期279-295,共17页
In intelligent transportation systems,object detection for a surveillance video is one of the important functions.The performance of existing surveillance video object detection algorithms is affected by the conflict ... In intelligent transportation systems,object detection for a surveillance video is one of the important functions.The performance of existing surveillance video object detection algorithms is affected by the conflict between the features of the objects,which leads to a decline in precision.Therefore,an object detection algorithm based on deep learning and salient feature fusion is proposed.The proposed method introduces a non-weight-sharing network to process the salient features of the image and fuse them with the features extracted from the red blue green branch.Different from the previous solutions,the salient feature extraction branch uses the boundary features and statistical features of the image and fuses the features of the two branches in the efficient layer aggregation networks structure.At the same time,the attention module is used in efficient layer aggregation networks with convolutional block attention module to improve the efficiency of feature utilisation.The training and evaluation are carried out in the constructed surveillance video feature conflict dataset,and eight scenes are constructed in the way of orthogonal experiments.The experimental results show that the performance of object detection can be significantly improved by using the proposed method in the object detection task of the intelligent transportation system surveillance video feature conflict scene. 展开更多
关键词 autonomous vehicle image processing intelligent transportation systems transportation
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Numerical model for rapid prediction of temperature field, mushy zone and grain size in heating−cooling combined mold (HCCM) horizontal continuous casting of C70250 alloy plates 认领 引用 被引量：1
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作者 Ling-hui MENG Fan ZHAO +3 位作者 Dong LIU Chang-jian LU Yan-bin JIANG Xin-hua LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期203-217,共15页
Machine learning-assisted methods for rapid and accurate prediction of temperature field,mushy zone,and grain size were proposed for the heating−cooling combined mold(HCCM)horizontal continuous casting of C70250 alloy... Machine learning-assisted methods for rapid and accurate prediction of temperature field,mushy zone,and grain size were proposed for the heating−cooling combined mold(HCCM)horizontal continuous casting of C70250 alloy plates.First,finite element simulations of casting processes were carried out with various parameters to build a dataset.Subsequently,different machine learning algorithms were employed to achieve high precision in predicting temperature fields,mushy zone locations,mushy zone inclination angle,and billet grain size.Finally,the process parameters were quickly optimized using a strategy consisting of random generation,prediction,and screening,allowing the mushy zone to be controlled to the desired target.The optimized parameters are 1234℃for heating mold temperature,47 mm/min for casting speed,and 10 L/min for cooling water flow rate.The optimized mushy zone is located in the middle of the second heat insulation section and has an inclination angle of roughly 7°. 展开更多
关键词 Cu alloy numerical simulation machine learning prediction model process optimization
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Process analysis of the impacts of ship emissions on PM2.5and O3in the Yangtze River Delta,China 认领 引用 被引量：1
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作者 Xinyi Fu Xiaotong Wang +3 位作者 Dongsheng Chen Jianlei Lang Ying Zhou Xiurui Guo 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期372-383,共12页
Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)m... Ship emissions significantly impact coastal air quality,with the Yangtze River Delta(YRD)region accounting for approximately 50%of China's total shipping emissions.Using the Community Multiscale Air Quality(CMAQ)model and process analysis(PA)tool,we quantitatively assessed how atmospheric processes(emissions,chemical reactions,transport,and deposition)contribute to PM2.5and O3,and the chemical pathways of O3formation due to ship emissions.Ship emissions significantly enhanced PM2.5concentrations(>5μg/m3)in the coastal areas of Jiangsu province and offshore regions,with diminishing inland effects.Ship-induced NO3-showed greater inland penetration compared to SO42-,which remained near the coast.In coastal cities,aerosol processes,rather than primary emissions,dominated PM2.5formation,highlighting the importance of secondary formation.O3responses varied spatially,showing coastal titration zones but inland enhancements.Process analysis revealed that vertical transport dominated O3distribution in coastal regions(5-10 ppb),whereas chemical processes showed strong negative contributions(below-10 ppb)along shipping routes.The impact exhibited pronounced diurnal variations,peaking during afternoon hours(14:00-17:00 local standard time(LST),up to 10 ppb/h)with morning titration effects(up to-7.5 ppb/h at 08:00 LST).The vertical profile analysis of shipping-related O3showed surface-level O3titration from ship NOxemissions,with impacts extending to higher layers through vertical mixing.Integrated reaction rate analysis revealed that effective O3control in shipping-influenced regions requires coordinated reduction of both NOxand VOCs.These findings provide insights for developing targeted control strategies,particularly for addressing the complex NOx-O3chemistry and secondary PM2.5formation. 展开更多
关键词 Ship emissions Process analysis PM(2.5) O3 Yangtze River Delta
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Atomic-scale ultrafast laser processing of nanocrystal with plasmonic modulation for machine learning combined flexible sensor devices 认领 引用 被引量：1
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作者 Ma Luo Jiaqun Li +6 位作者 Jiawang Xie Haoze Han Jianfeng Yan Yuzhi Zhao Yaoyao Li Huhu Cheng Liangti Qu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期620-638,共19页
Nanometallic materials have attracted wide research attention in the fabrication of functional devices,including flexible electronics circuits and high-sensitive sensors.Sintering of nanometallic materials is generall... Nanometallic materials have attracted wide research attention in the fabrication of functional devices,including flexible electronics circuits and high-sensitive sensors.Sintering of nanometallic materials is generally thought as an effective technology for the functional manufacturing,and the controllable sintering of nanometallic materials and its major mechanisms have long been a challenge.Here,an ultrafast laser processing strategy for Ag nanoparticles(NPs)is achieved by modulating plasmonic.The excitation mode of plasmon can be designed by laser parameters,including polarization with a specific crystal size.The atomic-scale ultrafast dynamics are revealed for understanding the sintering process and design of the sintered structures.The non-equilibrium energy transfer between electron and lattice and dynamic evolution of pressure are proved to be the foremost driving forces on the motion of atomic structures.Through research of plasmonic-induced electric field enhancement and non-uniform deposition of heat and in-situ observation of relative transmittance,mapping from atomic-scale structure to micro behavior is established.Based on plasmonic modulation and processing of Ag NPs,a machine learning combined flexible gesture sensor with high recognition accuracy is displayed.This work expands the knowledge of interactions between lasers and nanometallic materials and provides a method for designing functional devices for a wide range of applications. 展开更多
关键词 ultrafast laser fabrication plasmonic modulation atomic scale processing flexible devices
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A peridynamics modeling approach for pre-cracked rock cracking processes under impact by integrating Drucker-Prager plasticity model and efficient contact model 认领 引用 被引量：2
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作者 Jingzhi Tu Nengxiong Xu Gang Mei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期179-195,共17页
In rock engineering,natural cracks in rock masses subjected to external loads tend to initiate and propagate,leading to potential safety hazards.To investigate the effect of cracking behavior on the mechanical propert... In rock engineering,natural cracks in rock masses subjected to external loads tend to initiate and propagate,leading to potential safety hazards.To investigate the effect of cracking behavior on the mechanical properties of rocks,the cracking processes of pre-cracked rocks have been extensively studied using numerical modeling methods.The peridynamics(PD)exhibits advantages over other numerical methods due to the absence of the requirements for remeshing and external crack growth criterion.However,for modeling pre-cracked rock cracking processes under impact,current PD implementations lack generally applicable rock constitutive models and impact contact models,which leads to difficulties in determining rock material parameters and efficiently calculating impact loads.This paper proposes a non-ordinary state-based peridynamics(NOSBPD)modeling method integrating the Drucker-Prager(DP)plasticity model and an efficient contact model to address the above problems.In the proposed method,the Drucker-Prager plasticity model is integrated into the NOSBPD,thereby equipping NOSBPD with the capability to accurately characterize the nonlinear stress-strain relationship inherent in rocks.An efficient contact model between particles and meshes is designed to calculate the impact loads,which is essentially a coupling method of PD with the finite element method(FEM).The effectiveness of the proposed NOSBPD modeling method is verified by comparison with other numerical methods and experiments.Experimental results indicate that the proposed method can effectively and accurately predict the 3D cracking processes of pre-cracked cracks under impact loading,and the maximum principal stress is the key driver behind wing crack formation in pre-cracked rocks. 展开更多
关键词 Pre-cracked rocks Cracking processes Non-ordinary state-based peridynamics (NOSBPD) Drucker-Prager plasticity model Efficient contact model
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Mock Observations for the CSST Mission:Multi-Channel Imager——Instrument Simulation 认领 引用 被引量：1
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作者 Zhao-Jun Yan Huan-Yuan Shan +40 位作者 Zhen-Ya Zheng Xi-Yan Peng Zhao-Xiang Qi Chun Xu Lin Lin Xin-Rong Wen Chun-Yan Jiang Li-Xin Zheng Jing Zhong Fang-Ting Yuan Zhen-Lei Chen Wei Chen Mao-Chun Wu Zhen-Sen Fu Ke-Xin Li Lin Nie Chao Liu Nan Li Qiao Wang Zi-Huang Cao Shuai Feng Guo-Liang Li Lei Wang Cheng-Liang Wei Xiao-Bo Li Zhang Ban Xun Yang Yu-Xi Jiang De-Zi Liu Yong-He Chen Xiao-Hua Liu Fang Xu Xue Cheng Yue Su Tong-Fang Duan Chao Qi Na Li Geng Zheng Chong Ma Jing Tang Ran Li 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第2期78-97,共20页
The Chinese Space Station Survey Telescope(CSST),a two-meter aperture astronomical space telescope under China's manned space program,is equipped with multiple back-end scientific instruments.As an astronomical pr... The Chinese Space Station Survey Telescope(CSST),a two-meter aperture astronomical space telescope under China's manned space program,is equipped with multiple back-end scientific instruments.As an astronomical precision measurement module of the CSST,the Multi-Channel Imager(MCI)can cover a wide wavelength range from ultraviolet to near-infrared with three-color simultaneous high-precision photometry and imaging,which meets the scientific requirements for various fields.The diverse scientific objectives of MCI require not only a robust spaceborne platform,advanced optical systems,and observing facilities but also comprehensive software support for scientific operations and research.To this end,it is essential to develop realistic observational simulation software to thoroughly evaluate the MCI data stream and provide calibration tools for future scientific investigations.The MCI instrument simulation software will serve as a foundation for the development of the MCI data processing pipeline and will facilitate improvements in both hardware and software,as well as in the observational operation strategy,in alignment with the mission's scientific goals.In conclusion,we present a comprehensive overview of the MCI instrument simulation and some corresponding performances of the MCI data processing pipeline. 展开更多
关键词 methods numerical-telescopes-techniques image processing
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2.5D process path planning for multi-genus shapes based on combining of topological and geometric properties of medial axis transformation 认领 引用 被引量：1
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作者 Xin JIANG Wenjie ZHAO +3 位作者 Cheng SU Guanying HUO Shirong LI Zhiming ZHENG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期640-653,共14页
The 2.5D process is widely utilized in modern industries,with multi-genus cross-sections increasingly encountered in both additive and subtractive manufacturing.Tool paths for multigenus shapes often suffer from disco... The 2.5D process is widely utilized in modern industries,with multi-genus cross-sections increasingly encountered in both additive and subtractive manufacturing.Tool paths for multigenus shapes often suffer from discontinuities that lead to frequent tool liftings,and selfintersections in offset paths,adversely affecting machining accuracy and efficiency.In this context,path topology,stepover uniformity,and degeneration of offset paths represent three fundamental concerns that must be considered in an integrated manner in 2.5D path planning for multi-genus shapes.This study proposes a tool path planning method based on combining of topological and geometric characteristics of medial axis transformation for the shape with multi-genus.A region segmentation strategy tailored to multi-genus shapes is first introduced to prevent global selfintersections in equidistant offset paths.Subsequently,the graph structure of the segmented shape is extracted,and the minimization of tool liftings is formulated as a minimum path cover problem in an undirected graph.A Fermat-spiral-like path topology is adopted within sub-regions to preserve the connectivity of graph and ensure smooth transitions between successive layers of contourparallel paths.Numerical and physical experiment results confirm the proposed method's effectiveness in maintaining stepover uniformity,avoiding degeneration of global self-intersections,and ensuring path connectivity. 展开更多
关键词 2.5D process Medial axis transformation Multi-genus shape Topological segmentation Tool path planning
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