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Forming limit and failure behavior of fiber metal laminates under low-constraint conditions

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Chinese Journal of Aeronautics 2025年第1期38卷 638-653页

作者： Yao WANG Feng DING Yong LI Yunhua ZHANG Sifa ZHENG Libin ZHAO Ning HU School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China Suzhou Automotive Research Institute(Xiangcheng) Tsinghua UniversitySuzhou 215134China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin 300130China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Henan Benjie Technology Co. Ltd.Zhengzhou 450003China Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of EducationTianjin 300401China Key Laboratory of hebei Province on Scale-span Intelligent Equipment Technology Hebei University of TechnologyTianjin 300401China

Fiber Metal Laminates(FMLs),as high-performance composite materials,demonstrate exceptional potential in a wide range of applications,such as aeronautical and astronautical ***,the traditional cured FMLs possess complex interlayer stresses and low forming limits,restricting further promotion and application of ***-constraint FMLs exhibit a lower forming resistance and better formability due to no curing during the forming process;however,the formation mechanism and response are not *** paper presents the Forming Limit Diagram(FLD)of low-constraint GLARE(glass fiber reinforced aluminum laminates)based on the forming limit test,and compares it with the conventionally cured laminates to evaluate the differences in the forming *** addition,combined with the analysis of failure mechanism and micro-deformation mechanism of specimens,the influence of different temperatures(20–80℃)and forming states(width)on the deformation performance of laminates is further *** results reveal that the forming limit curve of low-constraint laminates shifts up with the increase of temperature,the forming limit initially increases with the increase of width,then followed by a gradual decrease,and the maximum principal strain of low-constraint laminates is increased by 29% at 80℃ compared to 20℃.The cured laminate has a principal strain range of 0–0.02,while the low-constraint laminates have a principal strain range of 0.03–*** with cured laminates,low-constraint laminates possess a higher forming limit due to the improvement in deformable degree between layers by resin flow and fiber slippage,which enhances their *** study is expected to serve as a reference for establishing forming limit criteria and optimizing forming schemes for low-constraint laminates.

关键词： Fiber Metal Laminates(FMLs) GLARE Low-constraint state Forming limit Failure mechanism

Effects of Bifidobacterium lactis BLa80 on fecal and mucosal flora and stem cell factor/c-kit signaling pathway in simulated microgravity rats

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World Journal of Gastroenterology 2025年第1期31卷 93-109页

作者： Ping Zhang Ying Zhu Pu Chen Tong Zhou Zhe-Yi Han Jun Xiao Jian-Feng Ma Wen Ma Peng Zang Ying Chen Graduate School Hebei North UniversityZhangjiakou 075000Hebei ProvinceChina Key Laboratory of Aerospace Nutrition and Food Engineering China Astronaut Research and Training CenterBeijing 100094China Department of Gastroenterology The Air Force Medical CenterBeijing 100142China Department of Blood Transfusion Air Force Medical CenterBeijing 100142China

BACKGROUND Simulated microgravity environment can lead to gastrointestinal motility *** pathogenesis of gastrointestinal motility disorders is closely related to the stem cell factor(SCF)/c-kit signaling pathway associated with intestinal flora and Cajal stromal ***,intestinal flora can also affect the regulation of SCF/c-kit signaling pathway,thus affecting the expression of Cajal stromal *** cells are the pacemakers of gastrointestinal *** To investigate the effects of Bifidobacterium lactis(***)BLa80 on the intestinal flora of rats in simulated microgravity and on the gastrointestinal motility-related SCF/c-kit *** The internationally recognized tail suspension animal model was used to simulate the microgravity environment,and 30 rats were randomly divided into control group,tail suspension group and drug administration tail suspension group with 10 rats in each group for a total of 28 *** tail group was given *** BLa80 by intragastric administration,and the other two groups were given water intragastric administration,the concentration of intragastric administration was 0.1 g/mL,and each rat was 1 mL/***&eosin staining was used to observe the histopathological changes in each segment of the intestine of each group,and the expression levels of SCF,c-kit,extracellular signal-regulated kinase(ERK)and p-ERK in the gastric antrum of each group were detected by Western blotting and *** fecal flora and mucosal flora of rats in each group were detected by 16S *** Simulated microgravity resulted in severe exfoliation of villi of duodenum,jejunum and ileum in rats,marked damage,increased space between villi,loose arrangement,shortened columnar epithelium of colon,less folds,narrower mucosal thickness,reduced goblet cell number and crypts,and significant improvement after probiotic *** microgravity reduced the expressions of SCF and c-kit,and increased the express

关键词： Simulated microgravity Rat Intestinal flora Gastrointestinal motility Stem cell factor/c-kit signaling pathway

Thermal proton-boron fusion on spherical torus

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Plasma Science and Technology 2025年第02期 6-8页

作者：董家齐陈伟陈忠勇王正汹杨青巍叶民友虞清泉 hebei Key Laboratory of Compact Fusion Southwestern Institute of Physics Huazhong university of Science and Technology Dalian university of Technology university of Science and Technology of China Max-Planck-Institut für Plasmaphysik

Significant progress has been made in magnetic and inertial confinement fusion （MCF and ICF） energy development since the achievement of world record parameters on the T3 tokamak in *** MCF,the triple product nτT has been elevated from 5×1017m-3·s·keV to 1×1021m-3·s·*** the same time,Q=Pfusion/Pheating,has increased from 1×10-9to 0.67,with expectations to exceed 10 in the ITER *** ICF,a Q value of approximately 2.4 was attained with a fusion energy output of around 5.2 MJ,

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An extended discontinuous deformation analysis for simulation of grouting reinforcement in a water-rich fractured rock tunnel

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 168-186页

作者： Jingyao Gao Siyu Peng Guangqi Chen Hongyun Fan Department of Civil and Structural Engineering Kyushu UniversityFukuoka819-0395Japan School of Resources and Safety Engineering Central South UniversityChangshaHunan410083China School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China School of Qilu Transportation Shandong UniversityJinanShandong250000China

Grouting has been the most effective approach to mitigate water inrush disasters in underground engineering due to its ability to plug groundwater and enhance rock ***,there is a lack of potent numerical tools for assessing the grouting effectiveness in water-rich fractured *** this study,the hydro-mechanical coupled discontinuous deformation analysis(HM-DDA)is inaugurally extended to simulate the grouting process in a water-rich discrete fracture network(DFN),including the slurry migration,fracture dilation,water plugging in a seepage field,and joint reinforcement after *** validate the capabilities of the developed method,several numerical examples are conducted incorporating the Newtonian fluid and Bingham *** simulation results closely align with the analytical ***,a set of compression tests is conducted on the fresh and grouted rock specimens to verify the reinforcement method and calibrate the rational properties of reinforced *** engineering-scale model based on a real water inrush case of the Yonglian tunnel in a water-rich fractured zone has been *** model demonstrates the effectiveness of grouting reinforcement in mitigating water inrush *** results indicate that increased grouting pressure greatly affects the regulation of water outflow from the tunnel face and the prevention of rock detachment face after excavation.

关键词： Discontinuous deformation analysis(DDA) Water-rich fractured rock tunnel Grouting reinforcement Water inrush disaster

Evaluating the impacts of converting grain to vegetable fields on nitrate transport in the deep vadose zone of the North China Plain

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Journal of Geographical Sciences 2025年第1期35卷 189-205页

作者： LIU Meiying MIN Leilei WU Lin ZHANG Yucui QI Yongqing WANG Shiqin LIU Binbin GENG Di SHEN Yanjun hebei Key Laboratory of Water-Saving Agriculture Key Laboratory of Agricultural Water ResourcesCenter for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyCASShijiazhuang050022China School of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing101408China

Nitrate(NO_(3)^(-))accumulation and transport processes in the thick vadose zone affect the evolution of the groundwater NO_(3)^(-)content in intensive agricultural *** land-use change(ALUC),typically accompanied by substantial alterations in nitrogen fertilizer application and irrigation practices,is an important influencing *** study evaluated the changes in NO_(3)^(-)accumulation and transport in the deep vadose zone(DVZ,below the root zone),and the groundwater NO_(3)^(-)content associated with ALUC from grain to vegetable fields in the North China Plain(NCP).The ALUC from grain to vegetable resulted in nitrate–nitrogen(NO_(3)^(-)-N)accumulation in DVZ increased by 235.5 kg ha^(-1)m^(-1)(163.2%)in the piedmont plain and 224.9 kg ha^(-1)m^(-1)(102.7%)in the central plain,*** change accelerated downward transport velocity in the DVZ(from 0.81±0.47 to 0.89±0.55 m yr^(-1)in the piedmont plain,and from 0.24±0.12 to 0.92±0.12 m yr^(-1)in the central plain)and increased NO_(3)^(-)leaching *** transport velocity and leaching fluxes resulted in chemical N-fertilizer entering the aquifer in several areas in the piedmont *** impact of the agricultural activity intensity changes,accompanied by the ALUC,on groundwater quantity and quality should be considered in similar regions.

关键词： grain field vegetable field nitrate groundwater deep vadose zone(DVZ)

Functional Lactiplantibacillus plantarum P10 screened from Chinese traditional pickle showing application potential in steamed bread for in-situ bio-preservation and GABA-enrichment

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Food Science and Human Wellness 2025年第1期14卷 190-202页

作者： Mengge Ma Yajuan Zhang Dongchun Zhang Yi Chen Zhixin Wang Yingmin Jia Yawei Ning College of Food and Biology Hebei University of Science and TechnologyShijiazhuang 050018China Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business UniversityBeijing 100048China

Mold spoilage and nutrition enrichment are major concerns of Chinese steamed bread,and using functional lactic acid bacteria as starter to play the role of in-situ preservation and nutritional fortification was a promising ***,Lactiplantibacillus plantarum P10 capable of inhibiting spoilage microorganisms and producing γ-aminobutyric acid(GABA)(380 mg/L)was screened from Chinese *** analysis showed that P10 produced key antimicrobial metabolites mainly including ten organic acids,aldehyde,***,P10 might exhibit health beneficial effects such as degrading cholesterol,lowering blood glucose and reducing uric acid due to the production of deoxycholic acid and Ile-Pro-Ile,and the degradation of ***,the promising application potential of P10 was evidenced in steamed bread with extended shelf life,excellent anti-aging effect,and 24.5-fold enrichment of ***,this investigation could provide scientific basis for the application of P10 as a functional starter in steamed bread.

关键词： Lactiplantibacillus plantarum Preservation Starter Steamed bread Metabolomics

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Optimizing crop yields while minimizing environmental impact through deep placement of nitrogen fertilizer

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Journal of Integrative Agriculture 2025年第1期24卷 36-60页

作者： Lingxiao Zhu Hongchun Sun Liantao Liu Ke Zhang Yongjiang Zhang Anchang Li Zhiying Bai Guiyan Wang Xiaoqing Liu Hezhong Dong Cundong Li State Key Laboratory of North China Crop Improvement and Regulation/Key Laboratory of Crop Growth Regulation of hebei Province/College of Agronomy Hebei Agricultural UniversityBaoding 071001China Institute of Industrial Crops State Key Laboratory of Nutrient Use and ManagementShandong Academy of Agricultural SciencesJinan 250100China

Nitrogen(N)serves as an essential nutrient for yield formation across diverse crop ***,agricultural production encounters numerous challenges,notably high N fertilizer rates coupled with low N use efficiency and serious environmental *** placement of nitrogen fertilizer(DPNF)is an agronomic measure that shows promise in addressing these *** review aims to offer a comprehensive understanding of DPNF,beginning with a succinct overview of its development and methodologies for ***,the optimal fertilization depth and influencing factors for different crops are analyzed and ***,it investigates the regulation and mechanism underlying the DPNF on crop development,yield,N use efficiency and greenhouse gas ***,the review delineates the limitations and challenges of this technology and provides suggestions for its improvement and *** review provides valuable insight and reference for the promotion and adoption of DPNF in agricultural practice.

关键词： deep placement of N fertilizer optimal fertilization depth yield N use efficiency greenhouse gas emissions

Research on the application of the parameter freezing precise exponential integrator in vehicle-road coupling vibration

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Applied Mathematics and Mechanics(English Edition) 2025年第2期46卷 373-390页

作者： Yu ZHANG Chao ZHANG Shaohua LI Shaopu YANG State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Department of Engineering Mechanics Shijiazhuang Tiedao University hebei Research Center of the Basic Discipline Engineering Mechanics Shijiazhuang Tiedao University

The vehicle-road coupling dynamics problem is a prominent issue in transportation, drawing significant attention in recent years. These dynamic equations are characterized by high-dimensionality, coupling, and time-varying dynamics, making the exact solutions challenging to obtain. As a result, numerical integration methods are typically employed. However, conventional methods often suffer from low computational efficiency. To address this, this paper explores the application of the parameter freezing precise exponential integrator to vehicle-road coupling models. The model accounts for road roughness irregularities, incorporating all terms unrelated to the linear part into the algorithm’s inhomogeneous vector. The general construction process of the algorithm is detailed. The validity of numerical results is verified through approximate analytical solutions (AASs), and the advantages of this method over traditional numerical integration methods are demonstrated. Multiple parameter freezing precise exponential integrator schemes are constructed based on the Runge-Kutta framework, with the fourth-order four-stage scheme identified as the optimal one. The study indicates that this method can quickly and accurately capture the dynamic system’s vibration response, offering a new, efficient approach for numerical studies of high-dimensional vehicle-road coupling systems.

关键词： vehicle-road coupled dynamics dynamic response parameter freezing precise exponential integrator Newmark-beta integration O242

High concentration of Ti3+ in C-TiOx nanosheets boosting efficient photodegradation

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Science China Technological Sciences 2025年第3期68卷 160-170页

作者： Chongbei WU Xuan LI Haibin WANG Jiaxin TANG Shuai WEI Yuanyuan WU Aobing WANG Jizhou JIANG hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment Hebei Vocational University of Technology and Engineering School of Materials Science and Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of Technology

Semiconductor photocatalysis holds significant promise for addressing dye-pollution in ***,the efficiency of photocatalytic water purification is constrained by the weak light absorption capacity and low active site distribution of *** a bottom-up approach,carbon-doped TiOx（C-TiOx） nanosheets with high concentrations of Ti3+active sites were fabricated by etching the Al element in Ti3Ai C2with *** evidence demonstrates that the optimal C-TiOxnanosheets exhibit high activity for the photocatalytic degradation of methylene blue,achieving a degradation rate of 100%within 50 *** introduction of carbon into the C-TiOxnanosheets induces a red shift in the absorption edge,boosting the migration of photo-generated charge ***,there is a significant correlation between the concentration of Ti3+active sites and the density of oxygen vacancies in the C-TiOxnanosheets,which synergistically influence the photocatalytic degradation performance of MB dye wastewater.

关键词： bottom-up strategies C-TiOx nanosheets high-concentrations Ti3+ photocatalytic degradation

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