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Theoretical and Numerical Studies on the Coupling Deformation of Global Lateral Buckling and Walking of Submarine Pipeline

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Journal of Ocean University of China 2023年第6期22卷 1516-1528页

作者： liU Run HAO xintong li Chengfeng li Qingxin YU Zheng ZHAO Dang State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China

Buckling initiation devices/techniques,including sleepers,distributed buoyancy,snake lay,and residual curvature method(RCM),have recently been widely applied in engineering.These initiated buckles may induce a long pipeline to transform into multiple short pipeline segments,which promote the occurrence of pipeline walking.Thus,a pipeline,which is designed to buckle laterally,may laterally and axially displace over time when subjected to repeated heating and cooling cycles.This study aims to reveal the coupling mechanism of pipeline walking and global lateral buckling.First,an analytic solution is proposed to estimate the walking of pipeline segments between two adjacent buckles.Then,the sensitivity of this method to heating and cooling cycles is analyzed.Results show the applicability of the proposed walking analytical solution of buckling pipelines.Subsequently,an influence analysis of walking on global buckling,including the capacity of buckling initiation,buckling amplitude,buckling mode,and failure assessment of the buckling pipeline,is performed.The results reveal that the effect of walking on the buckling axial force is negligible.However,pipeline walking will aggravate the asymmetry of the pipeline buckling and the failure parameters of the pipeline during the post-buckling.

关键词： submarine pipeline global lateral buckling pipeline walking coupling deformation analytic solution

Accuracy optimization of virtual iterative reduction algorithm under time constraint

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The Journal of China Universities of Posts and Telecommunications 2023年第2期30卷 49-60页

作者： Luo Zhiyong liu xintong Xu haifeng Xie Zhiqiang li Jie School of Computer Science and Technology Harbin University of Science and TechnologyHarbin 150080China

The factors like production accuracy and completion time are the determinants of the optimal scheduling of the complex products work-flow,so the main research direction of modern work-flow technology is how to assure the dynamic balance between the factors.Based on the work-flow technology,restraining the completion time,and analyzing the deficiency of traditional minimum critical path algorithm,a virtual iterative reduction algorithm(VIRA)was proposed,which can improve production accuracy effectively with time constrain.The VIRA with simplification as the core abstracts a virtual task that can predigest the process by combining the complex structures which are cyclic or parallel,finally,by using the virtual task and the other task in the process which is the iterative reduction strategy,determines a path which can make the production accuracy and completion time more balanced than the minimum critical path algorithm.The deadline,the number of tasks,and the number of cyclic structures were used as the factors affecting the performance of the algorithm,changing the influence factors can improve the performance of the algorithm effectively through the analysis of detailed data.Consequently,comparison experiments proved the feasibility of the VIRA.

关键词： work-flow virtual iterative reduction time constraint accuracy optimization optimized scheduling

Solidarity Between Chinese and Turkish People Attested in Trying Times

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China News Release 2023年第3期 9-13页

作者： LI Xintong Cui Yaling li Na Chen Wei 不详

A 7.8-magnitude earthquake struck Turkey and Syria on February 6,2023, causing huge losses to the people of the two countries. The disaster shocked the whole world.Off icial and civilian rescue forces from China instantly rushed to the stricken areas with disaster relief.More than 20 teams went to the most severely affected provinces in Turkey.

关键词： disaster earthquake magnitude

Modeling of microstructure evolution of AZ80 magnesium alloy during hot working process using a unified internal state variable method

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Journal of Magnesium and Alloys 2022年第1期10卷 299-313页

作者： Zexing Su Chaoyang Sun Mingjia Wang lingyun Qian xintong li School of Mechanical Engineering University of Science and Technology Beijing30 Xueyuan RoadHaidian DistrictBeijing 100083China Beijing Key Laboratory of lightweight Metal Forming Beijing 100083China College of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China Shunde Graduate School of University of Science and Technology Beijing Foshan528000China

In this paper, a unified internal state variable(ISV) model for predicting microstructure evolution during hot working process of AZ80 magnesium alloy was developed. A novel aspect of the proposed model is that the interactive effects of material hardening, recovery and dynamic recrystallization(DRX) on the characteristic deformation behavior were considered by incorporating the evolution laws of viscoplastic flow, dislocation activities, DRX nucleation and boundary migration in a coupled manner. The model parameters were calibrated based on the experimental data analysis and genetic algorithm(GA) based objective optimization. The predicted flow stress, DRX fraction and average grain size match well with experimental results. The proposed model was embedded in the finite element(FE) software DEFORM-3 D via user defined subroutine to simulate the hot compression and equal channel angular extrusion(ECAE) processes. The heterogeneous microstructure distributions at different deformation zones and the dislocation density evolution with competitive deformation mechanisms were captured.This study can provide a theoretical solution for the hot working problems of magnesium alloy.

关键词： AZ80 magnesium alloy Internal state variable model Microstructure evolution Dynamic recrystallization Hot working process Finite element simulation

The Application of Solid Waste in Thermal Insulation Materials: A Review

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Journal of Renewable Materials 2024年第2期12卷 329-347页

作者： Ming liu Pinghua Zhu Xiancui Yan Haichao li xintong Chen School of Environmental Science and Engineering Changzhou UniversityChangzhou213164China School of Urban Construction Changzhou UniversityChangzhou213164China

As socioeconomic development continues,the issue of building energy consumption has attracted significant attention,and improving the thermal insulation performance of buildings has become a crucial strategic measure.Simultaneously,the application of solid waste in insulation materials has also become a hot topic.This paper reviews the sources and classifications of solid waste,focusing on research progress in its application as insulation materials in the domains of daily life,agriculture,and industry.The research shows that incorporating household solid waste materials,such as waste glass,paper,and clothing scraps into cementitious thermal insulation can significantly reduce the thermal conductivity of the materials,leading to excellent thermal insulation properties.Insulation materials prepared from agricultural solid waste,such as barley straw,corn stalk,chicken feather,and date palm fibers,possess characteristics of lightweight and strong thermal insulation.Industrial solid waste,including waste tires,iron tailings,and coal bottom ash,can also be utilized in the preparation of insulation materials.These innovative applications not only have positive environmental significance by reducing waste emissions and resource consumption,but also provide efficient and sustainable insulation solutions for the construction industry.However,to further optimize the mix design and enhance the durability of insulation materials,continuous research is required to investigate the mechanisms through which solid waste impacts the performance of insulation materials.

关键词： Solid waste building energy consumption insulation material sustainability

Tunable bismuth doping/loading endows NaTaO_(3)nanosheet highly selective photothermal reduction of CO_(2)

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Nano Research 2023年第2期16卷 2142-2151页

作者： Mengmeng Zhang Changhua Wang Yueyun Wang Songmei li xintong Zhang Yichun liu Key Laboratory of Ultraviolet(UV)-Emitting Materials and Technology of Chinese Ministry of Education Northeast Normal UniversityChangchun 130024China

Photothermal CO_(2)reduction with H2O,integrating advantages of photocatalysis driven H2O splitting and thermal catalysis promoted CO_(2)reduction,has drawn sharply increasing attention in artificial synthesis of solar fuels.The photothermal effect of metal nanoparticles facilities CO_(2)hydrogenation and activation of lattice oxygen in oxide photocatalyst promotes H2O oxidation,which is essentially considered for highly efficient photothermal catalysis.However,the large thermal conductivity of most metal nanoparticles induces inevitable heat dissipation,restricting the increase of catalyst temperature.In this work,to minimize the heat dissipation,we employ bismuth nanoparticles as photothermal unit,which is of the lowest thermal conductivity in the metal family.Meanwhile,we adopt bismuth doped NaTaO_(3)as photocatalytic unit because of the bismuth doping induced activation of lattice oxygen.The bismuth nanoparticles are assembled with bismuth doped NaTaO_(3)through one-step tunable transformation from Bi4TaO8Cl.Benefiting from the photothermal effect,thermal insulation caused by bismuth metal,and lattice oxygen activation by bismuth doping,the NaTaO_(3):Bi hybrid exhibits high photothermal catalytic performance.The yield of CO over NaTaO_(3):Bi hybrid at 413 K via photothermal catalysis is 141 times higher than that room temperature photocatalysis.Further,ultraviolet(UV)light irradiation leads to 89.2%selectivity of CO and visible light irradiation leads to 97.5%selectivity of CH4.This work may broaden the photocatalytic application of ABO_(3)perovskite and provides a novel strategy for the development of photothermal catalysts for artificial photosynthesis.

关键词： CO_(2)reduction photothermal catalytic NaTaO_(3) bismuth high selectivity

The nuclear export receptor OsXPO1 is required for rice development and involved in abiotic stress responses

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The Crop Journal 2023年第1期11卷 71-78页

作者： Qiufei Peng Jieyu Qiu xintong li Xuezhong Xu Xinxiang Peng Guohui Zhu Guangdong Laboratory for lingnan Modern Agriculture College of Life SciencesSouth China Agricultural UniversityGuangzhou 510640GuangdongChina Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms Guangzhou 510640GuangdongChina

The transport of proteins to and from the nucleus is necessary for many cellular processes and is one of the ways plants respond to developmental signals and environmental stresses.Nucleocytoplasmic trafficking of proteins is mediated by the nuclear transport receptor(NTR).Although NTR has been extensively studied in humans and Arabidopsis,it has rarely been identified and functionally characterized in rice.In this study,we identified exportin 1 in rice(OsXPO1)as a nuclear export receptor.OsXPO1shares high protein identity with its functional homologs in Arabidopsis and other organisms.OsXPO1localized to both the nucleus and the cytoplasm,directly interacted with the small GTPases OsRAN1and OsRAN2 in the nucleus,and mediated their nuclear export.Loss-of-function osxpo1 mutations were lethal at the seedling stage.Suppression of OsXPO1 expression in RNA interference lines produced multifaceted developmental defects,including arrested growth,premature senescence,abnormal inflorescence,and brown and mouth-opened spikelets.Overexpression of OsXPO1 in rice reduced plant height and seed-setting rate,but increased plant tolerance in response to PEG-mimicked drought stress and salt stress.These results indicate that OsXPO1 is a nuclear export receptor and acts in regulating plant development and abiotic stress responses.

关键词： Exportin 1 Nucleocytoplasmic transport Plant development Abiotic stress

MXenes for perovskite solar cells:Progress and prospects

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Journal of Energy Chemistry 2023年第6期81卷 443-461,I0010页

作者： lin Yang Peng li Jiangang Ma xintong Zhang Xiao-Feng Wang Yichun liu Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024JilinChina Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012JilinChina

Perovskite solar cells(PSCs)have been developed over the past decade as the forefront of the state-of-theart photovoltaic technologies owing to their high efficiency and low cost,where nanostructured functional materials play key roles in performance optimization.As a versatile class of two-dimensional(2D)materials,transition metal carbides/nitrides MXenes have gained enormous attentions in PSCs since 2018 due to their superior properties such as excellent metallic conductivity,abundant surface functional groups,tunable work functions,high optical transparency,and mechanical robustness.The explorations of MXenes are of significance in performance promotion and commercialization expansion of devices.As such,this review focuses on the diversified advantages of MXenes,comprehensively summarizing their applications and developments in PSCs as additives,electron/hole transporting layers,interfacial engineering layers,and electrodes in sequence and explaining the relevant mechanisms behind.Simultaneously,the problems emerged from the related studies are considered and the corresponding suggestions like opening up the type of MXenes usage,taking further insight of the modulation of surface termination groups on Fermi levels,understanding the effect on energy level structures of perovskite or other functional layers,and realizing commercialization,etc.are provided for the future in-depth explorations.This review is intended to provide overall perspective of the current status of MXenes and highlight the direction for the future advancements in MXenes design and processes towards efficient,stable,large-area,and low-cost PSCs.

关键词： MXenes Two-dimensional materials Perovskite solar cells Photovoltaic technologies Environment

Oxygen vacancy enhanced biomimetic superoxide dismutase activity of CeO_(2)-Gd nanozymes

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Journal of Rare Earths 2021年第9期39卷 1108-1116页

作者： Xiangcheng Shi Jingjie Yang xintong Wen Fuii Tian Changyan li College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot010021China Department of Chemistry National University of Singapore.Singapore 117543Singapore Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126China

Cerium oxide-based nanozymes have recently drawn much attention in the field of biomedical and antioxidant applications,because of their unique regenerative or autocatalytic properties.Herein,we studied the biomimetic superoxide dismutase(SOD)nanozymes CeO_(2)-Gd that combines the fluorescence properties of rare earth Gd with the antioxidant properties of CeO_(2)nanoparticles,which was prepared via facile route.The structure and composition of the CeO_(2)-Gd were measured and verified by X-ray powder diffraction(XRD),Raman spectroscopy,transmission electron microscopy(TEM),energydispersive X-ray spectroscopy(EDX),and X-ray electron spectroscopy(XPS).Confocal microscopy was used to image cells.Antioxidant performance and cell viability of these nanozymes were measured in vitro using BGC-803 cell.CeO_(2)-Gd nanozymes with a higher Ce^(3+)/Ce^(4+)ratio show higher superoxide dismutase(SOD)mimetic activity.Their antioxidant activity and fluorescence properties of CeO_(2)-Gd in BGC-803 cancer cells are enhanced by oxygen vacancies generated by doping rare-earth elements Gd.This work may guide the future design of CeO_(2)-Gd-based biomimetic nanozymes for anticancer and antioxidant applications.

关键词： Antioxidant enzyme CeO_(2)-Gd nanozymes Superoxide dismutase Biomimetic nanozymes Oxygen vacancy Rare earths