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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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Recent advances in femtosecond direct laser writing of micro-optical imaging components 认领 引用 被引量：1
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作者 Minjing Li Wenbin Chen +7 位作者 ChunSan Deng Daqian Li Zhican Ning Huace Hu Weiming Wang Hui Gao Leimin Deng Wei Xiong 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期391-422,共32页
The advancement of modern optical imaging systems has generated a substantial demand for precision-engineered imaging components with complex functionalities.Despite various micro-nanofabrication techniques demonstrat... The advancement of modern optical imaging systems has generated a substantial demand for precision-engineered imaging components with complex functionalities.Despite various micro-nanofabrication techniques demonstrating significant advantages over traditional methods,critical challenges persist in achieving nanoscale resolution and freely designed intricate micro-optical structures.Femtosecond direct laser writing(FsDLW)emerges as a pivotal solution to these challenges,facilitating the fabrication of sophisticated architectures that transcend the diffraction limit through nonlinear multiphoton absorption.This technique processes exceptional capabilities,including extensive material compatibility,versatile micro-nanoscale fabrication,and true three-dimensional structuring.To date,FsDLW has been successfully employed in the manufacturing of diverse micro-optical imaging components.This review systematically elucidates the fundamental methodologies of FsDLW applicable to micro-optical device fabrication,alongside a comprehensive overview of the relevant material systems.Furthermore,recent advancements in micro-optical imaging devices and their emerging applications are critically assessed.Finally,we provide a prospective analysis of unresolved challenges and future research directions for imaging optical components. 展开更多
关键词 micro-optical imaging components FsDLW micro-nanofabrication micro-optics
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Influence of texture and oriented LPSO phase on mechanical anisotropy of cylindrical Mg-Gd-Y-Zn-Zr alloy component manufactured via back-extrusion 认领 引用
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作者 LI Ming WANG Xu +4 位作者 ZHAO Yong-xing FU Rong LIU Yu SHAO Hong-bang HUANG Yuan-chun 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2438-2458,共21页
To elucidate the origin of mechanical anisotropy in cylindrical Mg alloy components containing long-periodic stacking-ordered(LPSO)phases and to provide guidance for component-level microstructure design,this study sy... To elucidate the origin of mechanical anisotropy in cylindrical Mg alloy components containing long-periodic stacking-ordered(LPSO)phases and to provide guidance for component-level microstructure design,this study systematically investigated the combined effects of texture and oriented LPSO phases on the three-dimensional mechanical anisotropy of a cylindrical Mg-Gd-Y-Zn-Zr alloy component fabricated by back-extrusion.The results of uniaxial tensile tests show that there are significant differences in three-dimensional mechanical properties of cylindrical component,and the plastic anisotropy is more significant compared to the strength anisotropy.By comparing the Schmid factor(SF)distribution and slip mode of primary-texture and secondary-texture,it is revealed that primary-texture grains have a greater influence on strength anisotropy than secondary-texture grains.The larger SF difference between primary-texture grains and secondary-texture grains leads to significant gradient slip,uncoordinated strain and dislocation accumulation,which results in stronger dislocation strengthening,strain strengthening,and strength anisotropy.The fracture of blocky LPSO phases leads to straight cleavage planes,and the matrix is prone to the formation of numerous tearing ridges.The oriented blocky LPSO phase affects the strength anisotropy through load-bearing strengthening effect,and affects the plastic anisotropy by changing microcrack propagation mode and fracture mechanism.Overall,the oriented blocky LPSO phase has a more significant effect on mechanical anisotropy than the texture. 展开更多
关键词 magnesium alloy texture LPSO phase mechanical anisotropy cylindrical component
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Alkalinity regulation of bauxite residue mediated by Penicillium oxalicum:Insights into carbon components dynamics 认领 引用
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作者 Shengguo Xue Ziying Zhang +5 位作者 Xinfeng Qin Yifan Jiang Zhiqiang Zhao Mingli Wang Jinglan Ma Feng Zhu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第6期442-451,共10页
Microbially-driven alkaline neutralization during soil formation in bauxite residue is a promising technology toward sustainable management of alkaline solid-waste landscapes worldwide.However,our knowledge regarding ... Microbially-driven alkaline neutralization during soil formation in bauxite residue is a promising technology toward sustainable management of alkaline solid-waste landscapes worldwide.However,our knowledge regarding the impacts of microorganisms on the organic components dynamics involved in alkalinity regulation remains rather limited.In this study,we performed water-phase and solid-phase microcosm experiments using Penicillium oxalicum and sugarcane bagasse with gradient addition amount.Multi-spectroscopic techniques and metabolomic analysis were employed to investigate the combined effects of alkaline stabilization and carbon components dynamics in bauxite residue.An addition of 5‰of sugarcane bagasse was appropriate to reduce the pH of bauxite residue from 10.16 to30%.Spectroscopic analysis verified that sugarcane bagasse predominantly formed connections with humic substances,establishing zones rich in carbon containing fulvic and humic acids,which promoted the bio-production of lowmolecular-weight-organic acids.Metabolomic analysis identified 631 compounds,with 126 associated to carbon metabolism.Notably,tricarboxylic acid cycle(TCA)pathway involving acetate and oxalate were significantly upregulated following the combined application.Mantel-test analysis further showed positive correlations between 5-hydroxyindoleacetic acid and 5-phosphonooxy-L-lysine and alkalinity regulation,proving that the combined application regulated alkalinity by improving amino acid metabolism and carbon skeleton reutilization.Overall,our findings highlighted the metabolic mechanisms involved in alkalinity regulation during soil formation process mediated by P.oxalicum and provided an optimized solution for microbially-driven alkaline regulation within bauxite residue. 展开更多
关键词 Bauxite residue Penicillium oxalicum Carbon component Metabolomics Alkaline regulation Soilization
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Real-Time Monitoring of Component Conversion during the Foaming and Curing Process of Self-expanding Polyurethane Grouts 认领 引用
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作者 Xiao-Long Li Xuan-Xuan Zi +3 位作者 Xiao-Feng Liu Ming Guo Yan-Hui Zhong Bei Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第6期1843-1854,I0016,共12页
Polyurethane polymer grouting materials with rapid expansion and solidification characteristics have been widely applied for infrastructure repair and reinforcement.An accurate characterization of the chemical reactio... Polyurethane polymer grouting materials with rapid expansion and solidification characteristics have been widely applied for infrastructure repair and reinforcement.An accurate characterization of the chemical reaction process of the slurry is essential for investigating its grouting mechanism.However,the high concentration of isocyanate groups in such polymer systems causes a“flat-top phenomenon”in Fourier transform infrared(FTIR)spectroscopy,rendering it difficult to accurately determine the conversion rate.To address this issue,a real-time method for measuring the reaction conversion rates of slurry components was proposed.The polyol conversion rate was obtained by tracking the integral area changes of the C―O bond peak in the carbamate product relative to the internal standard.The total slurry volume was determined at different time intervals using light detection and ranging(LiDAR)-based point cloud scanning,from which the gas volume was estimated.Combined with the solubility curve of the physical blowing agent and ideal gas law,the conversion rate of the chemical blowing agent was calculated.The isocyanate conversion rate was indirectly inferred based on the measured polyol and chemical blowing agent conversions.This method was applied to a polyurethane grouting material used in an engineering project,and the time-resolved conversion curves of all components throughout the reaction were obtained.The results revealed a three-stage evolution:a slow initial increase,a rapid rise in the middle stage,and a gradual deceleration in the later stage.The foaming reaction proceeded consistently faster than the gelation reaction did.These findings provide a foundation for further research on the diffusion mechanisms of polyurethane polymer slurries. 展开更多
关键词 Grouting materials Polymer Chemical reaction Component conversion rate testing
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Comprehensive quality evaluation and principal component analysis of Crassostrea gigas from North Yellow Sea,China:characterizing nutritional,flavor,and functional profiles 认领 引用
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作者 Shanqin HUO Jixing PENG +3 位作者 Xinnan ZHAO Yichen LIN Xudong LI Zhijun TAN 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第1期406-418,共13页
Crassostrea gigas has good taste and high nutritional value;however,there are few assessments of comprehensive and panoramic analyses of the nutritional quality of the northern oyster.To study the nutritional characte... Crassostrea gigas has good taste and high nutritional value;however,there are few assessments of comprehensive and panoramic analyses of the nutritional quality of the northern oyster.To study the nutritional characteristics of C.gigas from different sources(ploidy,region,size,and culture mode),C.gigas from various ploidy(diploid and triploid),regions(Rushan,Off-site fattening,and Rongcheng),sizes(small,medium,and large)and culture modes(nearshore and offshore)were selected for comparative analyses.The nutritional components(moisture,protein,fat,and mineral),flavor substances(taste amino acids,nucleotides,and succinic acid),and functional indices(eicosapentaenoic acid(EPA),docosahexaenoic acid(DHA),and taurine)of C.gigas were determined.Principal component analysis(PCA)was used to comprehensively evaluate the oysters and investigate the variations in nutritional quality.The PCA results indicate that protein,essential fatty acids,selenium,zinc,taste amino acids,taurine,EPA,and DHA were core components contributing to 82.25%of the cumulative variance,providing a more comprehensive reflection of the nutrient composition of C.gigas.The extensive quality rankings for the C.gigas were as follows:diploid>triploid,Rushan>fattening>Rongcheng,medium>large>small,and offshore>nearshore.The score rank revealed that diploid oysters of medium-size from Rushan demonstrated superior nutritional quality compared to other tested samples.This is the first comprehensive and systematic investigation of C.gigas in northern China to reveal the feature of nutrients,flavor,and functional components.The study provided data support for the culture,consumption,processing,research,and nutritional quality improvement of oyster industry. 展开更多
关键词 Crassostrea gigas nutritional quality principal component analysis comprehensive evaluation
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Microstructure and properties of HPDC AM60 based alloys for super-sized integrated automotive components 认领 引用
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作者 Jing WANG Xin GUO +8 位作者 Jiang-feng SONG Dang-he SHI He-cong XIE Chun-yu LI Heng-rui HU Gong CHEN Bin JIANG Dong-xia XIANG Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第2期433-450,共18页
The commercial AM60(Mg−6Al−0.3Mn)die-casting alloy was modified through Mn,Ce,and La micro-alloying,each at a content below 0.2 wt.%.SEM,TEM,and Micro-CT were employed to characterize the microstructures and propertie... The commercial AM60(Mg−6Al−0.3Mn)die-casting alloy was modified through Mn,Ce,and La micro-alloying,each at a content below 0.2 wt.%.SEM,TEM,and Micro-CT were employed to characterize the microstructures and properties of AM60 based alloys.AM60-0.2La alloy showed excellent mechanical properties.The ultimate tensile strength,yield strength,and elongation of(288.0±1.7)MPa,(158.0±1.0)MPa,and(22.0±3.0)%were achieved in AM60-0.2La alloy.Besides,AM60-0.2La alloy exhibited the best corrosion resistance(0.29 mm/a)and fluidity among the investigated four alloys.The excellent mechanical properties and corrosion resistance are mainly attributed to the grain refinement strengthening,low porosity,and low content of large shrinkage porosity,promising for super-sized integrated automotive components. 展开更多
关键词 magnesium alloys microstructure mechanical properties high-pressure die-casting integrated automotive components
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Advanced forming technologies for integrated metal components with extreme size and structure:State-of-the-art and perspectives 认领 引用
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作者 Yizhe Chen Shilong Zhao +7 位作者 Yicheng Wang Yanxiong Liu Zhili Hu Dongsheng Qian Xinghui Han Hui Wang Jianguo Lin Lin Hua 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期211-235,共25页
In aerospace,nuclear power,and new energy vehicles industries,utilizing integrated metal components with extreme sizes and/or structures is crucial for achieving significant weight-saving,performance-improvement,and e... In aerospace,nuclear power,and new energy vehicles industries,utilizing integrated metal components with extreme sizes and/or structures is crucial for achieving significant weight-saving,performance-improvement,and excellent reliability.These components,made from metal sheets,rings,or tubes,exhibit characteristics like ultra-thin,ultra-thick,ultra-large,ultra-long,ultra-high ribs,and large variable diameters.During plastic de-formation in metal forming processes,defects such as ruptures,wrinkles,excessive strain differences,and un-expected weak performance areas are likely to occur due to the intersection of multiple effects in different research disciplines,including materials science,processes,and mechanics of materials.Consequently,the smooth forming of integrated parts is difficult.It is the first time to review,summarize,and analyze the ad-vancement of forming methods for producing integrated parts with extreme sizes and structures.The general academic ideas to change the process conditions and sequences to optimize stress state and improve plastic deformation ability for forming the components with extreme sizes/structures are introduced.Practical ex-amples,discussed in detail in the paper,include the forming of(i)integrated ultra-thin and ultra-thick sheet components;(ii)integrated ultra-large size ring components with thin wall and high ribs;and(iii)integrated ultra-long tube components with large perimeter difference.Various plasticity technologies and process se-quences have been developed.The key processes and applications of the technologies are discussed in detail,which achieve successful plastic forming of integrated components.This paper provides state-of-the-art and perspectives for the rapidly advancing material forming fields of key metal components for the next generation of equipment. 展开更多
关键词 Advanced forming technologies Integrated metal components Extreme size and structure
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Intelligent analysis of direct coal liquefaction diesel components by near-infrared spectroscopy 认领 引用
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作者 WANG Xiwu LI Haowei +4 位作者 QI Zhendong WANG Xingbao FENG Jie ZHU Yimeng LI Wenying 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第4期17-28,共12页
Diesel accounts for over 60%of the products derived from direct coal liquefaction(DCL).Compared to petroleum-based diesel,DCL diesel exhibits a cetane number ranging from 30 to 40,which fails to meet the automotive di... Diesel accounts for over 60%of the products derived from direct coal liquefaction(DCL).Compared to petroleum-based diesel,DCL diesel exhibits a cetane number ranging from 30 to 40,which fails to meet the automotive diesel standard requirement of≥45.Therefore,rapid and accurate analysis of its chemical composition is crucial for property optimization to meet fuel specifications by component blending.Thought traditional methods like gas chromatography offer high accuracy,they are unsuitable for rapid online analysis under industrial conditions.Near-infrared(NIR)spectroscopy can provide advantages in rapid,non-destructive analysis.Its application however,is limited by the complexity of spectral data interpretation.Machine learning(ML)is effective method for extracting valuable information from spectra and establishing high-precision prediction models.This study integrates NIR spectroscopy with ML to construct a spectral-composition database for DCL diesel.Feature extraction was performed using the correlation coefficient and mutual information methods to screen key wavelength variables and reduce data dimensionality.Subsequently,the predictive performance of three ML models—Lasso,SVR and XGBoost—was compared.Results indicate that excluding spectral data with absorbance greater than 1 significantly enhances model accuracy,increasing the test set R2 from 0.85 to 0.96.After feature extraction,the optimal number of wavelength variables was reduced to 177,substantially improving computational efficiency.Among the models evaluated,the SVR-MI-0.9 model,based on mutual information feature selection,demonstrated the best performance,achieving training and test set R2 values both exceeding 0.98.This model enables precise prediction of paraffin,naphthene,and aromatic hydrocarbon contents.This research provides a robust methodology for intelligent online quality monitoring.An intelligent NIR spectroscopy data analysis software was independently developed based on the established model.Compared with comprehensive two-dimensional gas chromatography,the software reduced the analysis time by over 98%,with an absolute prediction error below 0.2%.Thus,rapid analysis of DCL diesel components was successfully realized. 展开更多
关键词 direct coal liquefaction diesel real-time spectral detection machine learning feature extraction component prediction
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Investigation and prediction of material transfer in transitional region under local loading forming of large-scale rib-web components from perspective of multi-stage stress states 认领 引用
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作者 Chao YANG Ke WEI +2 位作者 Fangbin WANG Yong HOU Wenzhen CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期695-713,共19页
Titanium alloy large-scale rib-web components,known for their lightweight and highstrength properties,have the potential to substantially lighten the load-bearing components of aircraft.Isothermal Local Loading(ILL)ha... Titanium alloy large-scale rib-web components,known for their lightweight and highstrength properties,have the potential to substantially lighten the load-bearing components of aircraft.Isothermal Local Loading(ILL)has been recognized as an advanced technique for the integrated and less-loading forming of these components.However,material transfer in the transitional region during ILL often leads to folding defect near the die-partition line.To this end,the position of the neutral layer during ILL is calculated via the slab method,which is modified to align with the material flow in the transitional region,taking into account the multi-stage stress states under diverse boundary conditions.By utilizing this calculation model,the material transfer rate and rib-groove filling height can be ascertained.The material transfer rate serves as a criterion for predicting folding defect,and thereby an optimal billet is obtained and implemented in the ILL process.The results demonstrate that the material transfer rate is significantly decreased compared to the non-optimized billet,resulting in a non-folding component of transitional region. 展开更多
关键词 Isothermal local loading Large-scale rib-web component Multi-stage stress states Slab method Transitional region
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Achieving uniform microstructure and properties in large-sized seamless thin-walled cylindrical components with high-ribs using novel forward needle penetration extrusion process 认领 引用
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作者 Hui LI Cong CHANG +2 位作者 Hong-bang SHAO Yuan-chun HUANG Jun-hua CHENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第4期1055-1073,共19页
An innovative forward needle penetration extrusion die assembly was designed,which enabled precision manufacturing of large-sized seamless Al-Zn-Mg alloy thin-walled cylindrical components with high-ribs.Through syste... An innovative forward needle penetration extrusion die assembly was designed,which enabled precision manufacturing of large-sized seamless Al-Zn-Mg alloy thin-walled cylindrical components with high-ribs.Through systematic numerical simulation and experimental validation,optimal process parameters were established(billet temperature of 465℃,die temperature of 460℃,container temperature of 420℃,and extrusion speed of 1.5 mm/s),achieving exceptional material flow uniformity with a low standard deviation of the velocity field(SDV)of 0.478 at the bearing cross-section.The developed method produces seamless components exhibiting superior microstructural homogeneity compared to conventional porthole extrusion.Coarse secondary-phase particles are significantly fragmented after extrusion deformation,and grains are flattened into fibrous shapes,with the predominant recrystallization mechanisms being geometric dynamic recrystallization(GDRX)and discontinuous dynamic recrystallization(DDRX).Mechanical property variations across different regions are controlled within 7%,with the rib head region showing the highest tensile strength and yield strength,reaching 360 MPa and 215 MPa,respectively.Additionally,all regions exhibit elongation values exceeding 22%,indicating consistent ductility throughout the structure. 展开更多
关键词 thin-walled cylindrical components forward needle penetration extrusion numerical simulation microstructure evolution mechanical properties
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Time delay interferometry and principal component analysis for noise cancellation of TianQin 认领 引用
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作者 Xinchun Hu Yan Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期368-377,共10页
TianQin is a proposed space-borne laser interferometer which aims to detect gravitational waves in the low frequency band(10-4Hz-100Hz).However,for space-borne interferometry detectors the laser phase noise is e... TianQin is a proposed space-borne laser interferometer which aims to detect gravitational waves in the low frequency band(10-4Hz-100Hz).However,for space-borne interferometry detectors the laser phase noise is expected to be 7-8 orders of magnitude higher than the gravitational wave signals,due to unequal and time-varying arm lengths.Time delay interferometry(TDI)is an effective method to cancel laser phase noise by synthesizing virtual equal arm interferometric measurements with time delayed Doppler data combinations.In previous work it has been shown that TDI variables can also be understood within the context of principal component analysis(PCA),as combinations of eigenvectors of the total noise covariance matrix.It is therefore possible to generate the same TDI variables using a PCA approach-by computing the eigenvectors of the noise covariance matrix at a specific time.In this paper we extend significantly the previous work on a PCA approach to generating TDI variables by presenting TDI sensitivity curves for TianQin approximated as both a static and moving constellation of satellites.We compare the covariance matrix for the static and moving case,from the point of view of performing statistical inference using PCA.We also demonstrate the equivalency between the‘conventional'second generation TDI variables and those obtained using PCA. 展开更多
关键词 gravitational waves time delay interferometry principal component analysis
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Evolution of grain orientation and slip mode in gradient AZ31 magnesium alloy sheets with multiple texture components 认领 引用
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作者 Wen-tao NIU Feng LI +2 位作者 Jia-yang ZHANG Lu SUN Zi-yi WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期766-779,共14页
To investigate the evolution of grain orientation and slip modes in magnesium alloys with multiple texture components,an AZ31 gradient-structured magnesium alloy sheet was fabricated using hard plate rolling(HPR).The ... To investigate the evolution of grain orientation and slip modes in magnesium alloys with multiple texture components,an AZ31 gradient-structured magnesium alloy sheet was fabricated using hard plate rolling(HPR).The changes in texture and slip modes under different reductions were examined.The results demonstrate that the AZ31 magnesium alloy sheets display a self-epitaxial gradient structure,with the best mechanical properties observed at rolling temperature of 673 K and reduction of 50%.Significant changes in texture type and strength are observed along the normal direction(ND)of the sheet.The coarse-grain region exhibits a bimodal texture aligned with the rolling direction.These texture variations enhance the stress distribution at the fine grain-coarse grain interface,influencing the grain orientation and the activation of different slip modes,thus improving the mechanical properties of gradient-structured magnesium alloy sheets.This approach offers a new strategy for the fabrication of high-performance magnesium alloy sheets. 展开更多
关键词 hard plate rolling AZ31 magnesium alloy sheet gradient structure texture components grain orientation
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"Component flow" of shale oil and its significance for sweet spot evaluation in the Permian Lucaogou Formation,Jimsar Sag,Junggar Basin,China 认领 引用
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作者 ZHAO Wenzhi LIU Shiju +7 位作者 BIAN Congsheng SONG Yong GAO Gang LIU Wei LI Yongxin FAN Keting DONG Jin GUAN Ming 《Petroleum Exploration and Development》 SCIE 2026年第3期612-624,共13页
Considering the complex occurrence environment and significant compositional variation of continental shale oil,as well as the uncertainties in its mobility and producible amount,this study employs geochemical analysi... Considering the complex occurrence environment and significant compositional variation of continental shale oil,as well as the uncertainties in its mobility and producible amount,this study employs geochemical analysis and production monitoring to investigate the"component flow"phenomenon of shale oil during production from the Permian Lucaogou Formation in the Jimsar Sag,Junggar Basin.It is clarified that the miscibility of different hydrocarbon components and non-hydrocarbon substances improves the flowability of multi-component hydrocarbons and non-hydrocarbons,thereby effectively enhancing the production of shale oil.Research indicates that the"lower sweet spot"has a relatively high content of light and medium hydrocarbon components and strong formation energy compared to the"upper sweet spot"of Lucaogou Formation,resulting in higher density and viscosity of the produced crude oil,which can be regarded as evidence of"component flow"of retained hydrocarbons.The"upper sweet spot"exhibits two scenarios.In areas far from faults with good preservation conditions,the high content of light and medium components in retained hydrocarbons and a high formation pressure coefficient make component flow more likely to occur.Consequently,the produced crude oil has a higher density,and the estimated ultimate recovery(EUR)per well is also higher.In areas near faults with poor preservation conditions,although the produced crude oil has a light density,the EUR per well is relatively low,indicating that the conditions for component flow of retained hydrocarbons underground have deteriorated.The study also demonstrates that preservation conditions(preventing light hydrocarbon escape and maintaining formation energy)and production strategies(controlling production pressure differential and maintaining stable operations)are important factors in regulating the occurrence and continuity of"component flow"to maximize EUR per well.These new insights can be applied to the evaluation of economically productive"sweet spots"and provide guidance for achieving optimal EUR per well in shale oil production. 展开更多
关键词 continental shale oil Permian Lucaogou Formation oil property component flow preservation condition Jimsar Sag Junggar Basin
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Multi-method characterization of grain-size sensitive components in deep-sea sediments from the Zhongnan Seamount,South China Sea:implications for monsoon-volcanic interactions and turbidity current events 认领 引用
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作者 Yuanfu Yue Xintian Yu +2 位作者 Liuying He Xinmeng Yuan Kefu Yu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第2期162-174,共13页
Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS)... Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS).This study presents the first systematic comparison of three GSCS techniques,namely standard deviation(STD),endmember modeling(EMM),and principal component analysis(PCA).These methods are applied specifically to sediment core GT-06 recovered from the Zhongnan Seamount in the central South China Sea.By integrating grain-size unmixing with complementary proxies,including magnetic susceptibility(MS)and loss on ignition(LOI),we assess the resolving power of each method and relate the resulting components to site-specific sedimentary processes(e.g.,summer monsoon,volcanic activity,seamount collapse-induced turbidity currents).Key results show that all methods identified three dominant grain-size ranges(clay,silt-sand,coarse sand)with robust inter-method correlations.Critically,EMM and PCA uniquely resolved a volcanic-derived silt component(EM2)that was undetectable using the STD method,highlighting a key limitation of STD in complex settings.Four geologically meaningful end-members were identified:(1)fine-grained terrigenous clay linked to the East Asian summer monsoon(EASM),(2)volcanic detritus reflecting Quaternary submarine eruptions,(3)siliceous biogenic debris indicative of monsoon-modulated productivity,and(4)coarse calcareous fragments associated with seamount collapse-induced turbidity currents.The results highlight the superior ability of EMM/PCA to resolve complex signals,whereas STD serves as an efficient yet limited tool for first-order screening.Together,these methods form a site-adapted framework for tectonically active deep-sea seamounts:EMM/PCA enabling fine-scale interpretation of monsoon-volcanic-turbidity interactions,and STD supports rapid large-dataset comparison.This workflow improves the reliability of paleoenvironmental reconstructions in mixed-signal settings like the Zhongnan Seamount. 展开更多
关键词 grain-size sensitive component separation South China Sea Zhongnan Seamount East Asian monsoon volcanic activity turbidity currents deep-sea sediments
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Single-scan ultra-selective probing on targeted components from overlapped NMR spectra 认领 引用
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作者 Haolin Zhan Liangliang Hu +1 位作者 Yuqing Huang Zhong Chen 《Magnetic Resonance Letters》 EI CAS 2026年第2期69-79,共11页
Benefitting from the non-invasive and quantitative detection property,liquid NMR spectroscopy shows broad applications in the identification,separation,and structural determination of chemical substances in mixtures.H... Benefitting from the non-invasive and quantitative detection property,liquid NMR spectroscopy shows broad applications in the identification,separation,and structural determination of chemical substances in mixtures.However,its applications,especially to probing complex mixtures that contain abundant components and complicated molecular structures,somewhat encounter the challenge of spectral congestion.In this study,we demonstrate the ultra-selective extraction of targeted components from overlapped NMR spectra for mixture analyses by investigating the applications of the recent 1D selective GEMSTONE-TOCSY approach.This strategy first adopts an ultra-selective chemical shift filter to choose the targeted spins related to the components of interest,even though situated at overlapped spectral regions with decent suppression on unwanted surrounding signals.Sequentially,it utilizes the 1D selective TOCSY scheme to accurately extract total coupling networks associated with targeted spins,and then spectroscopically separate individual components,thus resolving overlapped NMR spectra.Apart from the measurements on electrolyte and sugar mixtures,experimental results demonstrate that it also allows one to analyze heterogeneous biological tissues containing plentiful metabolites and intrinsic field inhomogeneity via specific probe access to targeted components.Therefore,this study demonstrates a useful tool for component analyses and molecular structure measurements on complex chemical and biological mixtures,and it shows promising prospects for wide applications in the fields of chemistry,biology,energy,etc. 展开更多
关键词 NMR spectroscopy Ultra-selective chemical shift filter Targeted component probing Overlapped spectra Heterogeneous sample detection
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Active components and potential mechanisms of Wuzhuyu decoction(吴茱萸汤)in the treatment of ethanol-induced acute gastric mucosal injury:a network pharmacology and experimental verification 认领 引用
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作者 HUANG Huahua TU Mengzhen +2 位作者 XU Jie WU Xuebing CHEN Qiaofeng 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2026年第3期617-628,共12页
OBJECTIVE:To investigate the underlying mechanisms and active components of Wuzhuyu decoction(吴茱萸汤,WD)in alleviating ethanol-induced acute gastric mucosal injury(GMI)using an integrated approach of network pharmac... OBJECTIVE:To investigate the underlying mechanisms and active components of Wuzhuyu decoction(吴茱萸汤,WD)in alleviating ethanol-induced acute gastric mucosal injury(GMI)using an integrated approach of network pharmacology and experimental verification.METHODS:Sprague-Dawley rats were randomly divided into six groups:control(Con),model(Mod),bismuth potassium citrate(BPC),WD at low(WD-L),medium(WD-M),and high(WD-H)doses.Following seven days of continuous intragastric administration of the respective treatments,an ethanol-induced gastric mucosal injury model was established in all groups except the control group by oral gavage of anhydrous ethanol.The gastric mucosal injury index was evaluated,and pathological changes were assessed via hematoxylin and eosin(HE)staining.Levels of tumor necrosis factor-alpha(TNF-α),interleukin-1 beta(IL-1β),malondialdehyde(MDA),superoxide dismutase(SOD),and glutathione peroxidase(GSH-Px)were measured by enzyme-linked immunosorbent assay(ELISA).The chemical composition was identified by ultra-performance liquid chromatography-tandem mass spectrometry.Active compounds were screened using the Swiss-absorption,distribution,metabolism,and excretion database,and their potential targets were predicted using the Swiss Target Prediction database and bioinformatics annotation database for molecular mechanism.Simultaneously,disease targets related to GMI were retrieved from the online mendelian inheritance in man and Gene Cards databases.A protein-protein interaction(PPI)network was constructed,and functional enrichment analyses of gene ontology(GO)and Kyoto encyclopedia of genes and genomes(KEGG)enrichment analyses were performed using the Metascape database.Key predictions from the network pharmacology analysis were subsequently verified through animal experiments.Protein expression levels of B-cell lymphoma-2(Bcl-2),Bcl-2-associated X protein(Bax),Cleaved Caspase-3,and Cleaved Caspase-9 were analyzed by Western blot.Finally,molecular docking was performed using Auto Dock Vina to investigate the interactions between the active components and core targets.RESULTS:WD treatment significantly reduced the gastric mucosal injury index and the levels of TNF-α,IL-1β,MDA,while it increased the activities of SOD and GSH-Px.Histopathological examination revealed marked improvement in gastric tissue morphology.A total of 145 compounds were identified in WD.Network pharmacology analysis identified 440 overlapping targets between WD and GMI.GO and KEGG enrichment analyses highlighted the apoptosis signaling pathway as a key mechanism for WD's protective effect against ethanol-induced GMI.Experimental validation demonstrated that WD treatment reduced the apoptosis of gastric mucosal epithelial cells,promoted the expression of Bcl-2,and inhibited the expression of Bax,Cleaved Caspase-3 and Cleaved Caspase-9.Molecular docking results indicated that dehydroevodiamine,rutaecarpine,evodiamine,hexahydrocurcumin,and isorhamnetin are potential active components in WD that contribute to the inhibition of apoptosis.CONCLUSIONS:WD alleviates ethanol-induced acute GMI,at least in part,by inhibiting the apoptosis.The primary active components responsible for this effect are dehydroevodiamine,rutaecarpine,evodiamine,hexahydrocurcumin,and isorhamnetin. 展开更多
关键词 ethanol-induced acute gastric mucosal injury active components mechanism apoptosis network pharmacology Wuzhuyu decoction
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“Bridging”Structure Polymer Strategy for Morphology Regulation and Performance Optimization of Organic Solar Cells Based on the Ternary-component Polymer 认领 引用
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作者 Wan-Peng Zhang Miao-Miao Liu +4 位作者 Meng-Ran Fu Die Gao Qiao-Qiao Zhao Biao Xiao Ting-Xing Zhao 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期813-820,I0015,共8页
In this study,a polymer acceptor named BT-Cl with a“bridging”structure,which contained a benzodithiophene unit analogous to that of donor D18,and cyano(CN)groups and heterocyclic structures similar to those in accep... In this study,a polymer acceptor named BT-Cl with a“bridging”structure,which contained a benzodithiophene unit analogous to that of donor D18,and cyano(CN)groups and heterocyclic structures similar to those in acceptor N3,was synthesized.The“bridging”structure ensured good compatibility of BT-Cl with both D18 and N3,and effectively helped to reduce the large phase separation size of D18/N3 binary blend film when added as a third component.Meanwhile,the addition of BT-Cl to the D18/N3 blend can improve the crystallinity and enhance the light absorption efficiency to some extent.The“bridging”structure also resulted higher lowest unoccupied molecular orbital(LUMO)energy level of BT-Cl than that of N3,which effectively improve the open-circuit voltage(VOC)of the ternary device and consequently the power conversion efficiency(PCE).This work showed that the polymer with“bridging”structure as the third component was an effective strategy to decrease the large phase separation size. 展开更多
关键词 Polymer acceptor Bridging structure Compatibility Third component Phase separation size
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Evaluating the Roles of PM2.5and Its Components in Frailty:An Integration of Epidemiological and Network Toxicological Evidence 认领 引用
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作者 Jia Qiu Parastou Abbasian +8 位作者 Yinghao Yuchi Jian Zhang Ziyuan Zhang Huanxiang Zhang Chunwei Luo Jian Hou Xiaotian Liu Mu Wang Chongjian Wang 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2026年第5期591-596,共6页
Frailty has emerged as a prevalent issue among older adults,with epidemiological studies indicating that its prevalence may be as high as 26%.It is a nonspecific,age-related condition marked by increased vulnerability... Frailty has emerged as a prevalent issue among older adults,with epidemiological studies indicating that its prevalence may be as high as 26%.It is a nonspecific,age-related condition marked by increased vulnerability owing to the accumulation of various deficits[1].With the largest elderly population globally,China is projected to experience a further increase in its population in the coming years,which may pose significant challenges[2].The prevalence of frailty among older adults in China is notably elevated[3],leading to considerable economic and healthcare burdens on society. 展开更多
关键词 elderly network toxicology PM elderly population China epidemiological studies components frailty
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Criticality,resilience and prioritization of components in interdependent infrastructure systems:An overview of definitions and quantitative modelling approaches 认领 引用
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作者 Georgios Alexandros Chatzistefanou Albert S.Chen +2 位作者 Slobodan Djordjevic Lydia S.Vamvakeridou-Lyroudia Dragan A.Savic 《Resilient Cities and Structures》 EI CSCD 2026年第1期118-132,共15页
Enhancing the resilience of critical infrastructure(CI)systems has become a focal point of national and inter-national policies.However,the formulation of resilience enhancement strategies often requires component-(i.... Enhancing the resilience of critical infrastructure(CI)systems has become a focal point of national and inter-national policies.However,the formulation of resilience enhancement strategies often requires component-(i.e.asset-)level prioritization,which entails many complexities.Acknowledging the complex and interdependent nature of infrastructure systems,this paper aims to aid researchers,practitioners and policy-makers by pre-senting a review of the relative literature and current state-of-the-art,and by identifying future research op-portunities to improve the applicability and operationalizability of CI component identification and prioritization methods.Theoretical and practical applications are reviewed for definitions,analysis and modelling approaches regarding the resilience of interdependent infrastructure systems.A detailed review of infrastructure criticality definitions,component criticality assessment and prioritization frameworks,from scientific,policy and other documents,is presented.A discussion on social justice and equity dimensions therein is included,which have the potential to greatly influence decisions and should always be incorporated in infrastructure planning and in-vestment discussions.The findings of this review are discussed in terms of applicability and operationalizability.Key recommendations for future research include:(i)developing quantification frameworks for CI component criticality based on formal definitions and multiple criteria,(ii)incorporating the entire resilience cycle of CI in component prioritization,(iii)accounting for the socio-technical nature of CI systems by integrating social di-mensions and their wider operating environment and(iv)developing comprehensive model validation,cali-bration and uncertainty analysis frameworks. 展开更多
关键词 Critical infrastructure Interdependencies Criticality Resilience Component importance measures Cascading effects System-of-systems
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