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Investigating the dynamics and interactions of surface features on Pine Island Glacier using remote sensing and deep learning

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Advances in Climate Change Research 2024年第4期15卷 609-622页

作者： Qi ZHU hua-dong guo Lu ZHANG dong LIANG Zhe-Rong WU Zhuo-Ran LYU Xiao-Bing DU Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China University of Chinese Academy of Sciences Beijing 100049China School of Integrative Plant Science Soil and Crop Sciences SectionCornell University Ithaca 14850USA

Pine Island Glacier(PIG),the largest glacier in the Amundsen Sea Embayment of West Antarctica,has contributed to over a quarter of the observed sea level rise around *** recent years,multiple observations have confirmed its continuous retreat,ice flow acceleration and profound surface *** these changes is crucial for accurately monitoring ice mass discharge and future Antarctic contributions to sea level ***,it is essential to investigate the complex interactions between these variables to comprehend how they collectively affect the overall stability of the intricate PIG *** this study,we utilized high-resolution remote sensing data and deep learning method to detect and analyze the spatio-temporal variations of surface melt,ice shelf calving,and ice flow velocity of the PIG from 2015 to *** explored the correlations among these factors to understand their long-term impacts on the glacier's *** findings reveal a retreat of 26.3 km and a mass loss of 1001.6 km²during ***,extensive surface melting was observed,particularly in the 2016/2017 and 2019/2020 melting *** data vividly illustrate prolonged and intense melting periods,correlating with a significant retreat in the glacier's terminus position in 2019/***,the comprehensive analysis of surface melting and the cumulative retreat of the ice shelf from 2017 to 2020 on the PIG shows atemporal relationship with subsequent significant changes in ice fow velocity,ranging from 10.9 to 12.2 m d^(-1),with an average acceleration rate of 12%.These empirical findings elucidate the intricate relationship among surface melt,ice flow velocity,and consequential glacier dynamics.A profound understanding of these interrelationships holds paramount importance in glacier dynamic changes and modeling,providing invaluable insights into potential glacier responses to global climate change.

关键词： Pine island glacier Calving front Surface melt Ice flow velocity Remote sensing

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Effect of Processing Condition on Texture and Drawability of a Ferritic Rolled and Annealed Interstitial-Free Steel

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Journal of Iron and Steel Research International 2006年第6期13卷 60-65页

作者： WANG Zhao-dong guo Yan-hui ZHAO Zhong LIU Xiang-hua WANG guo-dong State Key Lab of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The processing conditions of the texture formation and deep drawability of a Ti-IF steel strip hot-rolled in ferritic region and subsequently annealed were investigated. The r-value increases with the decrease of reheating temperature, and finish rolling temperature and the increase of reductions in ferritic region. For lubricated ferritic rolling and annealing, the r-value is raised up to 1.75, and elongation rate is over 50% at the finish rolling temperature of 650 ℃, which is suitable for DDQ grade products. However, the r-value is below 1.0 in the case of unlubricated rolling. The X-ray diffraction was used to analyze the textural characteristic of samples. For samples subjected to lubricated rolling and annealing, the strong { 111 }//ND recrystallization texture is distributed homogeneously along the thickness direction, and the intensity of { 110} recrystallization texture is very low even in surface. However, for unlubricated samples, the {111} texture is distributed inhomogeneously and is weak along the thickness direction, and （110}//ND recrystallization texture is strong, which deteriorates the formability.

关键词： IF steel ferritic rolling annealing deep drawability texture

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Textures and Properties of Hot Rolled High Strength Ti-IF Steels

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Journal of Iron and Steel Research International 2008年第5期15卷 70-76页

作者： guo Yan-hui WANG Zhao-dong ZOU Wen-wen LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The texture evolution in a high strength Ti-IF steel during the processing of hot rolling, cold rolling, and annealing is studied. For comparison, both ferrite rolling and austenite rolling are employed. It is found that the texture type is the. same after ferrite rolling and austenite rolling, but the texture intensity is much higher in the ferrite rolled sample. Furthermore, texture characteristics at the surface are absolutely different from those at the mid sec tion in both ferrite rolled and austenite rolled samples, as well as under the cold rolled and annealed conditions. The shear texture { 110 } 〈001 〉 disappears and orientation rotates along { 110 } 〈001 〉→ { 554 } 〈 225 〉→ { 111 } 〈 112 〉→{111}〈110〉→{223}〈110〉 during cold rolling. Compared to the austenite rolled sample, the properties of the cold rolled and annealed sheet which is subjected to ferrite rolling are higher.

关键词： high strength Ti-IF steel ferrite rolling austenite rolling texture

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Effect of preoperative transcatheter arterial chemoembolization on angiogenesis of hepatocellular carcinoma cells

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World Journal of Gastroenterology 2009年第36期15卷 4582-4586页

作者： En-hua Xiao dong guo Du-lun Bian Department of Radiology the Second Xiangya Hospital Central SouthUniversity Changsha 410011 Htman Province China

AIM： To evaluate the effects of four types of preoperative transcatheter arterial chemoembolization （TACE） on angiogenesis of hepatocellular carcinoma （HCC） ceils. METHODS： A total of 136 patients with HCC underwent liver resection. One to five courses of TACE prior to liver resection were performed in 79 patients （TACE group）, in which one to four courses of chemotherapy alone were performed in 11 patients （group A）; one to five courses of chemotherapy combined with iodized oil were performed in 33 patients （group B）; one to three courses of chemotherapy combined with iodized oil and gelatin sponge were performed in 23 patients （group C）, one to three courses of chemotherapy combined with iodized oil, ethanol and gelatin sponge were performed in 12 patients （group D）. The other 57 patients only received liver resection （non-TACE group）. The microvessels were marked by CD31. The expression of CD31 and vascular endothelial growth factor （VEGF） protein were detected by immunohistochemical methods. RESULTS： The mean microvessel density （MVD） in HCC cells was significantly higher in groups A, B, C and D than in the nonACE group （P 〈 0.05）. The expression of VEGF protein in HCC cells were significantly higher in groups A, B, C and D than in the non-TACE group （P 〈 0.05）. MVD and the expression of VEGF protein were positively correlated. Mean MVD and the expression of VEGF protein were closely related to the number of courses of TACE and the interval of TACE. CONCLUSION： Four different types of preoperative TACE regimens enhanced angiogenesis in HCC cells by up-regulating the expression of VEGF protein. It is necessary to repress angiogenesis of liver cancer after TACE.

关键词： Angiogenesis Hepatocellular carcinoma Immunohistochemistry Transcatheter arterial chemoembolization Vascular endothelial growth factor

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Re-reddening on Strip Surface After Water Cooling

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Journal of Iron and Steel Research International 2007年第3期14卷 26-29,55页

作者： ZHI Ying LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

After water cooling, there is a big temperature difference between the center and the surface of strip, which leads to the heat transfer from the center to the surface, and the surface temperature can rise in a short time. The finite element method was used to simulate the phenomena of re-reddening on the surface of strip and to analyze the temperature field of hot roiled strip during laminar cooling, and the periodical variation curve of the cooling rate was obtained during water cooling and subsequent re-reddening. The results show that the critical line of the cooling rate is at 1/3 of the half-thickness from the strip surface. The regression model of the relation of rereddening temperature, time, and distance from the surface was obtained in the re-reddening region. Re-reddening regularity on the surface of strip under the condition of different thickness and cooling rate was also studied.

关键词： temperature field re-reddening laminar cooling cooling rate hot rolled strip finite element method

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Analysis of Crack Tip Stress of Transversal Crack on Slab Corner During Vertical-Horizontal Rolling Process by FEM

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Journal of Iron and Steel Research International 2008年第3期15卷 19-26页

作者： YU Hai-liang LIU Xiang-hua WANG guo-dong The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Behavior of transversal crack notched on slab corner during vertical-horizontal rolling process was simulated by FEM. The crack tip stress in the whole rolling process was obtained. Influences of the friction coefficient, the initial crack size, the edger roll profile, and the groove fillet radii of grooved edger roll on crack tip stress were analyzed. For vertical rolling, the tension stress appears at crack tip near the slab top surface and the compression stress appears at crack tip near the slab side surface for the flat edger roll; however, the compression stress appears at crack tip near the slab top surface and the tension stress appears at crack tip near the slab side surface in the exit stage for the grooved edger roll. For horizontal rolling, the tension stress appears at crack tip just at the exit stage for the flat edger roll, and the tension stress appears in whole rolling stage; the tension stress value near the slab side surface is much larger than that near the slab top surface for the grooved edger roll.

关键词： transversal crack vertical-horizontal rolling process crack tip stress FEM

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Progress in Modeling of Phase Transformation Kinetics

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Journal of Iron and Steel Research International 2006年第3期13卷 68-73页

作者： ZHAO Hong-zhuang LIU Xiang-hua WANG guo-dong State Key Lab of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Several methods representing the evolution of microstructure were introduced, which include the Johnson-Mehl-Avrami-Kolmogorov （JMAK） equation, Internal State Variable （ISV） framework, Koistinen-Marburger （K-M） equation, modified Magee＇s rule and phase field model, etc. By combining calculation of martensite transformation kinetics, considering the selection of parameters with the effect of austenite grain size （AGS）, some suitable ways of obtaining better results have been proposed.

关键词： phase transformation kinetics modeling numerical simulation

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Splitting Rolling Simulated by Reproducing Kernel Particle Method

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Journal of Iron and Steel Research International 2007年第3期14卷 42-46页

作者： CUI Qing-ling LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

During splitting rolling simulation, re-meshing is necessary to prevent the effect of severe mesh distortion when the conventional finite element method is used. However, extreme deformation cannot be solved by the finite element method in splitting rolling. The reproducing kernel particle method can solve this problem because the continuum body is discretized by a set of nodes, and a finite element mesh is unnecessary, and there is no explicit limitation of mesh when the metal is split. To ensure stability in the large deformation elastoplastic analysis, the Lagrange material shape function was introduced. The transformation method was utilized to impose the essential boundary conditions. The splitting rolling method was simulated and the simulation results were in accordance with the experimental ones in the literature.

关键词： elasto-plasticity large deformation reproducing kernel particle method splitting rolling

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New Method for Evaluating Thermal Wear of Rolls in Rolling Process

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Journal of Iron and Steel Research International 2008年第6期15卷 52-55页

作者： LI Chang-sheng LIU Xiang-hua WANG guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

A new method was developed by a thermal wear machine to evaluate the thermal wear of roils in steel rolling process. The steel strip and rolls were simulated by upper and lower heating disks. The upper heating disk could he kept at a temperature of over 900 ℃ by induction heating. The pressure between the disks as high as 323.2 MPa could be achieved and the slipping rate could be 12. 7 %. The thermal wear of high speed steel （HSS） roll material, the wear rate of the HSS roll, and the SEM morphology of a worn HSS roll surface were investigated. This method was useful and could be employed to simulate friction and wear between strip and roll during the strip rolling process.

关键词： thermal wear roll friction strip rolling induction heating

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Effect of Sulfur Content and Sulfide Shape on Fracture Ductility in Case Hardening Steel

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Journal of Iron and Steel Research International 2011年第8期18卷 58-64页

作者： XIAO guo-hua dong Han WANG Mao-qiu HUI Wei-jun National Engineering Research Center of Advanced Steel Technology Central Iron andSteel Research Institute Beijing 100081 China

The effects of sulfur content and calcium addition on smooth axisymmetric tensile fracture ductility of case hardening steel DIN 18CrNiMo7-6 have been investigated. The quantitative metallographic analysis of sulfide inclusions and the correlations between sulfide inclusions and fracture ductility were examined. Sulfide inclusions were found to have deleterious effect on fracture ductility, whereas the effect can be offset to some extent by calcium-treat- ment due to less easily deforming of sulfides during hot-working. The product （AA·λAW） of sulfide inclusion area fraction （An） and its area-weighted aspect ratio （λAW） can be used as a parameter to describe the effect of sulfide inclusions on fracture true strain.

关键词： case hardening steel calcium treatment sulfide fracture ductility

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