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Journal of Hydrodynamics 2006年第4期18卷 443-448页

作者： LUO Yun-ju liu dong-yan liu Xin-rong College of Civil Engineering Chongqing University Chongqing 400045 China

The Nanwenquan （South Hot Spring） and Xiao quan （Small Hot Spring） in the Nanwenquan anticline are well-known attraction for their geothermal water, but currently, the two natural hot springs have hot flow naturally. In order to protect the geothermal water resource, the evolution of hydrodynamic field must be researched for the causation of the hydrodynamic field destroyed. The finite element numerical simulation was adopted and quantitative study on the geothermal water hydrodynamic field. The finite element model was set up to simulate the research sites, the simulated water level was compared with the actual water level, the feasibility of this model was proved when the simulated water level is approximate to actual one, and an applicable finite element model was obtained. The finite element model was used to simulate the evolution of the hydrodynamic field. This paper supplies a basis to exploit adequately and protect effectively the geothermal water resource, at the same time it is proved feasible in practice to apply finite element numerical simulation to quantitative study of the geothermal water.

关键词： Nanwenquan anticline the geothermal water hydrodynamic field finite element numerical simulation water level

Results of the maximum genus of graphs

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Science China Mathematics 2007年第11期50卷 1563-1570页

作者： Guang-hua dong yan-pei liu Department of Mathematics School of ScienceBeijing Jiaotong UniversityBeijing 100044China Department of MathematicsSchool of ScienceBeijing Jiaotong UniversityBeijing 100044China

In this paper,we provide a new class of up-embeddable graphs,and obtain a tight lower bound on the maximum genus of a class of 2-connected pseudographs of diameter 2 and of a class of diameter 4 *** extends a result o... 详细信息

关键词： maximum genus up-embeddable diameter

Robust Stabilizing Regions of Fractional-order PI~λ Controllers for Fractional-order Systems with Time-delays

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International Journal of Automation and computing 2017年第3期14卷 340-349页

作者： Zhe Gao Li-Rong Zhai yan-dong liu College of Light Industry Liaoning University College of Information Science and Engineering Northeastern University

This study focuses on a graphical approach to determine the robust stabilizing regions of fractional-order PIλ（proportional integration） controllers for fractional-order systems with time-delays. By D-decomposition technique, the existence conditions and calculating method of the real root boundary（RRB） curves, complex root boundary（CRB） curves and infinite root boundary（IRB）lines are investigated for a given stability degree. The robust stabilizing regions in terms of the RRB curves, CRB curves and IRB lines are identified by the proposed criteria in this paper. Finally, two illustrative examples are given to verify the effectiveness of this graphical approach for different stability degrees.

关键词： Fractional-order systems time-delays PIλ (proportional integration) controllers stabilizing regions stability degree

Landfill leachate production, quality and recirculation treatment in northeast China

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Journal of Environmental Sciences 2006年第4期18卷 625-628页

作者： ZHAO Qing-liang liu Xue-yan QI Xu-dong liu Zhi-gang School of Municipal and Environment Engineering Harbin Institute of Technology Harbin 150090 China

Landfill leachate recirculation treatment process is a promising and economic way in northeast China due to the distinct season variation. In order to study the impact of recirculation on leachate production and its quality, two simulated sanitary landfill reactors, one with leachate recirculation and the other without, were placed outdoor in Harbin. The two-year experimental results indicated that leachate production was reduced by 86% with leachate recirculation and less or no facility for leachate treatment required. Recirculation could improve the leachate quality dramatically with lower COD, SS, NF4-N and higher pH level. Recirculation also could enhance waste degradation and stabilization and improve the efficiency of landfill. This study confirmed that leachate recirculation was a very feasible way for on-site landfill leachate treatment in cold areas.

关键词： cold area sanitary landfill leachate recirculation solid waste

Intestinal dendritic cells change in number in fulminant hepatic failure

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World Journal of Gastroenterology 2015年第16期21卷 4883-4893页

作者： Xu Cao Mei liu Peng Wang dong-yan liu Research Center Shengjing Hospital of China Medical University and Key Laboratory of Congenital Malformation ResearchMinistry of Health

AIM:To investigate the change in intestinal dendritic cell(DC)number in fulminant hepatic failure(FHF).METHODS:An animal model of FHF was *** CD11b/c was detected by immunohistochemistry and Western *** real-time polymerase chain reaction(PCR)was used to detect intestinal integrin-αm RNA *** CD83,CD86,CD74,CD3 and AKT were detected by immunohistochemistry,Western blot and ***-AKT(p-AKT)was detected by immunohistochemistry and Western ***:In the FHF group[D-galactosamine(D-Galn)+lipopolysaccharide(LPS)group],the mice began to die after 6 h;conversely,in the D-Galn and LPS groups,the activity of mice was poor,but there were no *** results showed that in FHF,the expression of CD11b/c(7988400±385941vs 1102400±132273,P0.05)

关键词： Fulminant hepatic failure Intestinal dendriticcells MHC Ⅱ CD3 AKT/Phosphorylated-AKT

Snow algal blooms in Antarctic King George Island in 2017-2022 and their future trend based on CMIP6 projection

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Advances in Climate Change Research 2023年第5期14卷 732-745页

作者： Xue-yang CHEN Shuang-Lin LI Chao ZHANG dong-yan liu Institute of Atmospheric Physics/Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan 430074China College of Earth and Planetary Sciences University of the Chinese Academy of SciencesBeijing 100029China College of Marine Sciences Beibu Gulf UniversityQinzhou 535011China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 20062China

Snow algal blooms have a remarkable climatic or environmental effect through influencing the snow-albedo feedback,accelerating the melting of surface snow,and amplifying global *** algal blooms occurred frequently on King George Island,Antarctic,during the recent six austral summers(December to next February)through *** on an assessment of satellite images,this study found that the range and amount of snow algal blooms in the summers of 2018,2020,2021 and 2022 are relatively larger than in the summers of 2017 and *** meteorological conditions have shaped the year-to-year variation of algal bloom intensities is analyzed through observational *** results suggest that during the strong bloom summers there exist prevailing northerly or northwesterly wind anomalies which advect warm and humid airmass from the southern ocean into the island,increasing surface air temperature and humidity;the warmer and more humid surface favors melting of snow and an increase of low cloud cover,subsequently enhancing the atmospheric downward long-wave radiation and amplifying surface warmth;the increased low cloud cover reflects more ultraviolet rays back to space and weakens the short-wave radiation reaching the *** these factors together favor to a stronger *** comparison,during 2017 and 2019 there exist weak southerly wind anomalies which induce the northward advection of cold and dry air from the Antarctic Continent and favor the cooler ***,it is unfavorable for the snow algal *** on these results,a snow algal bloom potential index(API)integrating the meteorological conditions is constructed,and its future trend is projected based on the EC-Earth3 run attending the CMIP6 under SSP245 and SSP585.A significant increasing trend is projected especially under *** snow algal bloom on King George Island will become more frequent and stronger in *** implies a potential accelerate melting of ice shelf

关键词： Antarctic Peninsula Snow algal bloom Meteorological conditions Satellite images Future projection

Microstructure Characterization and Mechanical Properties of TRIP-aided Steel under Rapid Heating for Different Holding Time

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Journal of Iron and Steel Research International 2016年第2期23卷 138-144页

作者： De-chao XU yan-dong liu Jun LI Qing-ge MENG Pei LI School of Materials and Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Central Research Institute of Baosteel Shanghai 201900China Shanghai JiaoTong University Shanghai 200240China

In order to develop a comprehensive understanding about the effect of different holding time under rapid heating on the microstructural evolution and mechanical properties of transformation-induced plasticity （TRIP） steel, continuous annealing process simulations were performed using a thermal system with resistance heating method. The morphology and distribution of all phases present in the microstructure and the mechanical properties of TRIP steel were revealed. It appeared that the final tensile strength of the TRIP steel increased and retained austenite car bon content decreased with increasing holding time. An overlap between ferrite recrystallization and austenitization was observed during intercritical holding. In addition, the work hardening of the samples was evaluated by calculat ing the instantaneous ~l value as a function of the true strain. The difference in work hardening behavior corresponds to the rate of the retained austenite transformation during straining, which can be attributed to the carbon content and the morphology of the retained austenite.

关键词： TRIP-aided steel rapid heating holding time austenite formation retained austenite

Texture Evolution, Formability and Ridging Resistance of a Sn-bearing Ferritic Stainless Steel Under Different Hot Band Annealing Temperatures

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Acta Metallurgica Sinica(English Letters) 2019年第11期32卷 1362-1372页

作者： Tong He-Dan Guo yang Bai Tong He Dan Guo Xiu-Ting liu Fang-Yuan Shao yan-dong liu Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education Northeastern UniversityShenyang 110819China Research Academy Northeastern UniversityShenyang 110819China

The microstructure, texture evolution and spatial orientation distribution during cold rolling and the subsequent annealing as well as formability and ridging of a Sn-bearing ferritic stainless steel under different hot band annealing temperatures were investigated. The four hot bands with annealing temperatures of 900, 950, 1000 and 1050 °C were all cold-rolled to 80% reductions and then were annealed at the same temperature of 900 °C. The results show that optimizing hot band annealing process is benefi cial to reduce the amount of {001} grains and weaken the texture intensity, and thus, to reduce ridging and improve formability. In the present study, the fi nal sheets with hot band annealing temperature of 900 °C possess small and inhomogeneous grains with a large amount of {001} orientations, which deteriorates the formability and increases the ridging. In comparison, the fi nal sheets with hot band annealing temperature of 950 °C are comprised of uniform and equiaxed //ND(ND: normal direction) recrystallized grains with a high texture intensity favorable for the improvement in r value and surface quality. However, when hot band annealing temperature further increases to 1000 and 1050 °C, it shows a sharp decrease in r value and a remarkable increase in ridging as a result of a reduction in γ-fi ber texture intensity and an increase in grain size in the fi nal sheets. Suitable controlling and optimizing hot band annealing process is essential to improve the formability and reduce the ridging.

关键词： Ferritic stainless steel Texture Formability Ridging

Pulmonary Langerhans cell histiocytosis in adults: A case report

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World Journal of Clinical Cases 2019年第14期7卷 1892-1898页

作者： Feng-Feng Wang Ya-Shuang liu Wei-Bo Zhu yan-dong liu Yao Chen Department of Respiration People’s Hospital of Jingjiang YangZhou University Medical Academy

BACKGROUND Langerhans cell histiocytosis (LCH) is a rare disease of unknown aetiology. While it may affect any organ of the body, few cases of solitary lung involvement are published in the literature. Here, we report a rare case of pulmonary LCH (PLCH) in an adult. CASE SUMMARY A 52-year-old male presented to hospital in July 2018 with complaints of progressively worsening cough with sputum, breathlessness, easy fatigability, and loss of appetite since 2016, and a 32-year history of heavy cigarette smoking (average 30 cigarettes/d). Physical examination showed only weakened breathing sounds and wheezing during lung auscultation. Chest computed tomography (CT) showed irregular micronodules and multiple thin-walled small holes. Respiratory function tests showed a slight decrease. Ultrasonic cardiogram showed mild tricuspid regurgitation and no pulmonary hypertension. Fibreoptic bronchoscopy was performed with transbronchial biopsies from the basal segment of right lower lobe. LCH was confirmed by immunohistochemistry. The final diagnosis was PLCH without extra-pulmonary involvement. We suggested smoking cessation treatment. A 3-mo follow-up chest CT scan showed clear absorption of the nodule and thin-walled small holes. The symptoms of cough and phlegm had improved markedly and appetite had improved. There was no obvious dyspnoea. CONCLUSION Imaging manifestations of nodules, cavitating nodules, and thick-walled or thinwalled cysts prompted suspicion of PLCH and lung biopsy for diagnosis.

关键词： Pulmonary Langerhans' cell histiocytosis Adult Smoking cessation Imaging Nodules Case report

Improvement of Mechanical Properties of Magnesium Alloy ZK60 by Asymmetric Reduction Rolling

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Acta Metallurgica Sinica(English Letters) 2018年第1期31卷 63-70页

作者： Ling Wang Yi-Quan Zhao Hong-Mei Chen Jing Zhang yan-dong liu Yi-Nong Wang School of Materials Science and Engineering Northeastern University Shenyang 110819 China Yingkou Institute of Technology Yingkou 115014 China School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Provincial Key Lab of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003 China School of Metallurgy and Materials Engineering Jiangsu University of Science and Technology Zhangjiagang 215600 China

The improvement of mechanical properties of ZK60 processed by asymmetric reduction rolling （ARR） was investigated in this paper. The grain refinement and basal texture intensity decrease were attributed to the introduction of shear stress produced by ARR process. Compared to conventional symmetrical rolled （SR） ZK60 alloys, ARRed ZK60 exhibited finer, more homogeneous grains and higher mechanical properties. The intensity of basal texture of ARRed ZK60 after annealing was lower than that of SRed ZK60 after annealing. ZK60 sheet with good combination of strength and ductility could be obtained by ARR process. The yield strength （YS） and ultimate tensile strength （UTS） of the ARRed ZK60 sheet were increased 150% and 91.3%, compared to those of SRed ZK60 sheet, from 80 to 200 MPa and from 140 to 264 MPa, respectively. Simultaneously, the elongation to failure increased by 68.75% in the ARR sheet （27%） when compared to that of the SR sheet （16%）.

关键词： ZK60 ARR Microstructure Texture Mechanical properties