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S304管道焊缝温度场的数值模拟与分析

山西冶金 2024年第5期47卷 118-120页

作者：于皓郑纯亮叶建国杨星宇海洋石油工程(青岛)有限公司山东青岛266520

采用ANSYS综合性有限元分析软件,对S304不锈钢材质的圆管焊接过程进行模拟,详细分析焊接过程中产生的温度场,并据此确定合理焊接参数。该分析方法对提高大型国际工程项目中焊接任务的效率和质量有积极影响。

关键词：焊接工艺 ANSYS软件有限元分析温度场参数优化

Zoned Zircon from Eclogite Lenses in Marbles from the Dabie-Sulu UHP Terrane,China: A Clear Record of Ultra-deep Subduction and Fast Exhumation

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Acta Geologica Sinica(English Edition) 2007年第2期81卷 204-225页

作者： LIU Fulai A. GERDES P. T. ROBINSON XUE Huaimin ye jianguo The Key Laboratory of Continental Dynamics Ministry of Land and Mineral Resources of China Institute of Geosciences Mineralogy J. W. Goethe University Frankfurt 60054 Germany Department of Earth Sciences Dalhousie University Halifax Nova Scotia Canada

Eclogite lenses in marbles from the Dabie-Sulu ultrahigh-pressure （UHP） terrane are deeply subducted meta-sedimentary rocks. Zircons in these rocks have been used to constrain the ages of prograde and UHP metamorphism during subduction, and later retrograde metamorphism during exhumation. Inherited （detrital） and metamorphic zircons were distinguished on the basis of transmitted light microscopy, cathodoluminescence （CL） imaging, trace element contents and mineral inclusions. The distribution of mineral inclusions combined with CL imaging of the metamorphic zircon make it possible to relate zircon zones （domains） to different metamorphic stages. Domain 1 consists of rounded, oblong and spindly cores with dark-luminescent images, and contains quartz eclogite facies mineral inclusion assemblages, indicating formation under high-pressure （HP） metamorphic conditions of T = 571-668℃ and P =1.7-2.02 GPa. Domain 2 always surrounds domain 1 or occurs as rounded and spindly cores with white-luminescent images. It contains coesite eclogite facies mineral inclusion assemblages, indicating formation under UHP metamorphic conditions of T = 782-849℃ and P 〉 5.5 GPa. Domain 3, with gray-luminescent images, always surrounds domain 2 and occurs as the outermost zircon rim. It is characterized by low-pressure mineral inclusion assemblages, which are related to regional amphibolite facies retrograde metamorphism of T = 600- 710℃ and P = 0.7-1.2 GPa. The three metamorphic zircon domains have distinct ages; sample H1 from the Dabie terrane yielded SHRIMP ages of 245 ± 4 Ma for domain 1, 235 ± 3 Ma for domain 2 and 215± 6 Ma for domain 3, whereas sample H2 from the Sulu terrane yielded similar ages of 244 ± 4 Ma, 233 ± 4 Ma and 214 ± 5 Ma for Domains 1, 2 and 3, respectively. The mean ages of these zones suggest that subduction to UHP depths took place over 10-11 Ma and exhumation of the rocks occurred over a period of 19-20 Ma. Thus, subduction from - 55 km to 〉 160 km deep mantle depth

关键词： zoned zircon SHRIMP U-Pb dating ultra-deep subduction fast exhumation eclogite lenses in marble Dabie-Sulu UHP belt

THE LINEAR SAMPLING METHOD FOR RECONSTRUCTING A PENETRABLE CAVITY WITH UNKNOWN EXTERNAL OBSTACLES

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Acta Mathematica Scientia 2023年第2期43卷 751-776页

作者：叶建国严国政 Research Center of Modern Mathematics and Its Application School of Mathematics and StatisticsKashi UniversityKashi 844000China School of Mathematics and Statistics Central China Normal UniversityWuhan 430079China

We consider the interior inverse scattering problem for recovering the shape of a penetrable partially coated cavity with external obstacles from the knowledge of measured scattered waves due to point *** the first part,we obtain the well-posedness of the direct scattering problem by the variational *** the second part,we establish the mathematical basis of the linear sampling method to recover both the shape of the cavity,and the shape of the external obstacle,however the exterior transmission eigenvalue problem also plays a key role in the discussion of this paper.

关键词： inverse scattering mixed boundary value problem exterior transmission eigen-value interior measurements linear sampling method

A method for determining the complex refractive index dispersion of absorbing materials without thickness information

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Optoelectronics Letters 2024年第11期20卷 676-680页

作者： DENG Zhichao MEI Jianchun WANG Jin ye Qing TIAN jianguo Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics and TEDA Applied Physics Nankai University

The complex refractive index dispersion(CRID) of absorbing materials is very important in many fields, especially in printing industry and medical research. However, due to their strong absorbing, CRID determination i... 详细信息

关键词： A

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Experimental study on the movement of oil spill under freeze-thaw action

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Research in Cold and Arid Regions 2024年第3期16卷 111-120页

作者： ZeLiang ye jianguo Lu MingYi Zhang WanSheng Pei ShuTong Li State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Sciences Beijing 100049China School of Civil Engineering and Geomatics Southwest Petroleum UniversityChengduSichuan 610500China

Oil leakages cause environmental pollution,economic losses,and even engineering safety *** cold regions,researchers urgently investigate the movement of oil spill in soils exposed to freeze-thaw *** this study,a series of laboratory model experiments were carried out on the migration of oil leakage under freeze-thaw action,and the distributions of the soil temperature,unfrozen water content,and displacement were *** results showed that under freeze-thaw action,liquid water in soils migrated to the freezing front and *** the pipe cracked,oil pollutants first gathered at one side of the leak hole,and then moved *** pipe wall temperature affected the soil temperature field,and the thermal influence range below and transverse the pipe wall(35–40 cm)was larger than that above the pipe wall(8 cm)owing to the soil surface *** leaked oil's temperature would make the temperature of the surrounding soil *** would inhibit the cooling of the ***,oil migration was significantly affected by the gravity and water flow *** freeze-thaw action would affect the migration of the oil,which was mainly manifested as inhibiting the diffusion and movement of oil when soils were *** water transport caused by freeze-thaw cycles would also inhibit oil *** research results would provide a scientific reference for understanding the relationship between the movement of oil pollutants,water,and soil temperature,and for establishing a waterheat-mass transport model in frozen soils.

关键词： Freeze-thaw action Oil movement Soil temperature Unfrozen water content Model test

Hybrid structure of iron single atoms and metallic titanium for photothermal ethanol steam reforming

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Science China Chemistry 2024年第3期67卷 848-854页

作者： Dachao Yuan Guanda Han Zhixuan Wang jianguo Zhao Kailuan Li Pengfei Wang Jianjun Hao Yaguang Li Jinhua ye College of Mechanical and Electrical Engineering Technology Innovation Center of Intelligent Agricultural EquipmentHebei Agricultural UniversityBaoding 071001China Research Center for Solar Driven Carbon Neutrality The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan Graduate School of Chemical Science and Engineering Hokkaido UniversitySapporo 060-0814Japan

Photothermal ethanol steam reforming(ESR) is currently limited by low intrinsic activity and strong solar energy ***,we synthesized Fe single atoms supported on CeO_(2)(SA Fe-CeO_(2)) to exhibit excellent low-temperature ESR activity with a hydrogen production rate of 512 mmol g^(-1)h^(-1) at 350℃,becuase of the high oxidation state of Fe single atoms to weaken the reaction barrier of ethanol ***,a heterostructure of SA Fe-CeO_(2) and Ti foil could eliminate 66% of infrared radiation via the size effect,thus achieving a 3.5 sun-driven temperature of 347℃.Consequently,the heterostructure of SA Fe-CeO_(2) and Ti foil shows a hydrogen generation rate of 984 mmol g^(-1)h^(-1) of ESR and 11.31% of solar-to-hydrogen energy conversion efficiency,which outperforms other photothermal ethanol-hydrogen production *** study provides a new path for designing active catalytic sites and trapping light energy of photothermal catalysts.

关键词： photothermal catalysis single atoms heterostructure ethanol steam reforming iron

The transcriptional control of LcIDL1–LcHSL2 complex by LcARF5 integrates auxin and ethylene signaling for litchi fruitlet abscission

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Journal of Integrative Plant Biology 2024年第6期66卷 1206-1226页

作者： Xingshuai Ma Zidi He ye Yuan Zhijian Liang Hang Zhang Vilde Olsson Lalun Zhuoyi Liu Yanqing Zhang Zhiqiang Huang Yulian Huang jianguo Li Minglei Zhao State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangdong Laboratory for Lingnan Modern AgricultureKey Laboratory of Biology and Genetic Improvement of Horticultural Crops(South China)Ministry of Agriculture and Rural AffairsGuangdong Litchi Engineering Research CenterCollege of HorticultureSouth China Agricultural UniversityGuangzhou 510642China Dongguan Botanical Garden Dongguan 523128China Section for Genetics and Evolutionary Biology Department of BiosciencesUniversity of OsloBlindernveien 31Oslo 0316Norway College of Agriculture Guangxi UniversityNanning 530004China

At the physiological level,the interplay between auxin and ethylene has long been recognized as crucial for the regulation of organ abscission in ***,the underlying molecular mechanisms remain ***,we identified transcription factors involved in indoleacetic acid(IAA)and ethylene(ET)signaling that directly regulate the expression of INFLORESCENCE DEFICIENT IN ABSCISSION(IDA)and its receptor HAESA(HAE),which are key components initiating ***,litchi IDAlike 1(LcIDL1)interacts with the receptor HAESA-like2(LcHSL2).Through in vitro and in vivo experiments,we determined that the auxin response factor LcARF5 directly binds and activates both LcIDL1 and ***,we found that the ETHYLENE INSENSITIVE 3-like transcription factor LcEIL3 directly binds and activates *** expression of IDA and HSL2 homologs was enhanced in Lc ARF5and Lc EIL3 transgenic Arabidopsis plants,but reduced in ein3 eil1 ***,the expressions of LcIDL1 and LcHSL2 were significantly decreased in Lc ARF5-and LcEIL3-silenced fruitlet abscission zones(FAZ),which correlated with a lower rate of fruitlet *** of auxin led to an increase in 1-aminocyclopropane-1-carboxylic acid(the precursor of ethylene)levels in the litchi FAZ,followed by abscission *** this process,LcRF5 and LcEIL3 were induced in the ***,our findings suggest that the molecular interactions between litchi AUXIN RESPONSE FACTOR 5(LcARF5)-LcIDL1/LcHSL2 and LcEIL3–LcIDL1 signaling modules play a role in regulating fruitlet abscission in litchi and provide a long-sought mechanistic explanation for how the interplay between auxin and ethylene is translated into the molecular events that initiate abscission.

关键词： auxin ethylene fruit abscission IDA–HAE/HSL2 litchi

IKIP downregulates THBS1/FAK signaling to suppress migration and invasion by glioblastoma cells

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Oncology Research 2024年第7期32卷 1173-1184页

作者： ZHAOYING ZHU YANJIA HU FENG ye HAIBO TENG GUOLIANG YOU YUNHUI ZENG MENG TIAN jianguo XU JIN LI ZHIYONG LIU HAO LIU NIANDONG ZHENG Department of Neurosurgery The Affiliated Hospital of Southwestern Medical UniversityLuzhouChina Department of Neurosurgery Sichuan University West China HospitalChengduChina

Background:Inhibitor of NF-κB kinase-interacting protein(IKIP)is known to promote proliferation of glioblastoma(GBM)cells,but how it affects migration and invasion by those cells is ***:We compared levels of IKIP between glioma tissues and normal brain tissue in clinical samples and public *** examined the effects of IKIP overexpression and knockdown on the migration and invasion of GBM using transwell and wound healing assays,and we compared the transcriptomes under these different conditions to identify the molecular mechanisms ***:Based on data from our clinical samples and from public databases,IKIP was overexpressed in GBM tumors,and its expression level correlated inversely with *** overexpression in GBM cells inhibited migration and invasion in transwell and wound healing assays,whereas IKIP knockdown exerted the opposite *** overexpression in GBM cells that were injected into mouse brain promoted tumor growth but inhibited tumor invasion of surrounding *** effects of IKIP were associated with downregulation of THBS1 mRNA and concomitant inhibition of THBS1/FAK ***:IKIP inhibits THBS1/FAK signaling to suppress migration and invasion of GBM cells.

关键词： Inhibitor of NF-κB kinase-interacting protein(IKIP) Glioblastoma(GBM) Migration Thrombospondin 1(THBS1) FAK signaling

Investigations of Water Flow Behaviors Induced by Local Temperature Variations through a Single Rough Fracture for the Enhanced Geothermal Systems

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Journal of Thermal Science 2024年第3期33卷 1055-1064页

作者： LI Jiawei ye Lin Department of Energy and Power Engineering Tsinghua UniversityBeijing100084China School of Power and Energy Northwestern Polytechnical UniversityXi’an710072China

In recent years,Enhanced Geothermal System(EGS)technologies have been applied to the geothermal resources production in the Hot Dry Rock(HDR).The core of EGS technologies is to adopt hydraulic fracturing in the reservoir to create a connected network of discrete fractures with the consideration of water as a working fluid for hydraulic fracturing and heat *** paper investigates the characteristics of water flow behaviors through a single rough fracture under different temperature and pressure conditions.A single fracture model with rough fracture surfaces is constructed and then characterized,and influences of the anisotropic factor on the average tortuosity and frictional resistance coefficient of water flow through a single fracture with rough surfaces have been compared and *** consideration of other impacting factors(temperature,pressure,fracture roughness),the impact of mass flow rate has also been *** simulation results present that changes of average tortuosity for water flow through a single rough facture are mainly affected by *** can be observed that higher temperature leads to larger average tortuosity but the frictional resistance coefficient shows an opposite *** for pressure conditions,it is found that effects of pressure on average tortuosity and frictional resistance coefficient is very small,which can be neglected under high pressure ***,the average tortuosity shows a progressively linear relationship with the mass flow *** the contrary,the frictional resistance coefficient has a negative relationship with the mass flow *** is revealed that when the mass flow rate reaches a critical point,the influences of temperature on the frictional resistance coefficient will be *** of single rough fractures with different anisotropic factors show that values of average tortuosity and frictional resistance coefficient have positive relationships with the increase

关键词： single rough fracture tortuosity frictional resistance enhanced geothermal system