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Dynamic process simulation with a Savage-Hutter type model for the intrusion of landslide into river

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Journal of Mountain Science 2016年第7期13卷 1265-1274页

作者： LIU Wei He Si-ming ou yang Chao-jun Key laboratory of Mountain Hazards and Surface Process Chinese Academy of Science Institute of Mountain Hazards and Environment Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences

Natural damming of rivers by mass movements is a very common and potentially dangerous phenomena which has been documented all over the world. In this paper, a two-layer model of Savage-Hutter type is presented to simulate the dynamic procedure for the intrusion of landslide into rivers. The two-layer shallow water system is derived by depth averaging the incompressible Navier-Stokes equations with the hydrostatic assumption. A high order accuracy scheme based on the finite volume method is proposed to solve the presented model equations. Several numerical tests are performed to verify the realiability and feasibility of the proposed model. The numerical results indicate that the proposed method can be competent for simulating the dynamic process of landslide intrusion into the river. The interaction effect between both layers has a significant impact on the landslide movement, water fluctuation and wave propagation.

关键词： Landslide Two-layer model Savage Hutter type Numerical simulation

Numerical simulation for different motion forms of sliding soil along slope with PFC3D

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Journal of Mountain Science 2016年第1期13卷 146-156页

作者： JI Xian-jun LIANG Ying WANG jun yang Shun ou Guo-qiang Nanyang Institute of Technology Nanyang 473004China Institute of Mountain hazards and Environment Chinese Academy of SciencesChengdu 610041China

The motion forms（deformation） of the sliding soil along the slope include inviscid particle flow,viscous particle flow,and mass *** motion forms were mainly influenced by the mechanical properties of the viscous mud medium *** effect of the medium filling on the motion forms of the sliding soil is worth *** sliding soil can be seen as the mixture which is composed of the medium filling and coarse *** Chengdu clay with different moisture contents were selected as the medium *** mechanical parameters were experimentally measured for simulating the moving process of the sliding *** motion forms of the sliding soil were numerical simulated based on PFC3D by changing the specific mechanical *** mechanical parameters of the Chengdu clay are experimentally *** numerical results show that with the moisture content of the filling slurry medium in the range of 〉302%,101%~182%,and 〈80%,the motion form of the sliding soil belongs to the inviscid particles flow（similar with the sliding sand）,viscous particles flow（seen as the viscous flows）;and masssliding（seen as the block sliding along the slope surface）,respectively.

关键词： sliding filling viscous coarse moisture Chengdu slurry simulating formulate unstable

Numerical Investigation of the Load Distribution between the Main Blade and the Splitter Blade in a High-Loading Centrifugal Compressor

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Journal of Thermal Science 2022年第5期31卷 1682-1695页

作者： ou jun JIN Donghai GUI Xingmin Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang UniversityBeijing100191China Jiangxi Research Institute of Beihang University Nanchang330096China

In the traditional design of the centrifugal compressor,the splitter blade and the main blade always keep the same ***,to enable high efficiency of the high-loading centrifugal compressor,the matching of design parameters of the splitter blade and the main blade needs to be *** this paper,the influence of the load distribution between the main blade and the splitter blade on the aerodynamic performance,the flow field,and the internal vortices of a high-loading centrifugal compressor were studied by means of CFD *** cases with different values of the variable CR which is defined as the load-ratio of splitter blade to main blade were set *** each case,the splitter blade and the main blade were shaped according to different laws of circulation distribution(_(r)V_(u))while the average circulation of the splitter blade and the main blade at any meridional position were consistent with that of the *** results showed that a proper reduction of the load-ratio of splitter blade to main blade is beneficial to suppress the leakage vortex of the splitter blade and reduce the scale of the wake in the channel near the suction-side of the splitter blade,which consequently improves the flow uniformity at the impeller outlet and enhances the aerodynamic performance of both the stage and the *** stage isentropic efficiency of the optimal case was found to be 0.7%higher than that of the prototype and the stage total pressure ratio was also *** optimal value of CR,which in this investigation is 94%,is supposed to be the result of the trade-off between the development of the wake and the leakage vortices in adjacent two *** optimization of the load distribution between the main blade and the splitter blade provides an opportunity to further improve the high-loading centrifugal compressor performance.

关键词： high-loading centrifugal compressor load distribution performance flow uniformity wake leakage vortex

Density-based rough set model for hesitant node clustering in overlapping community detection

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Journal of Systems Engineering and Electronics 2014年第6期25卷 1089-1097页

作者： jun Wang Jiaxu Peng ou Liu School of Economics and Management Beihang University School of Accounting and Finance The Hong Kong Polytechnic University

Overlapping community detection in a network is a challenging issue which attracts lots of attention in recent years.A notion of hesitant node（HN） is proposed. An HN contacts with multiple communities while the communications are not strong or even accidental, thus the HN holds an implicit community ***, HNs are not rare in the real world network. It is important to identify them because they can be efficient hubs which form the overlapping portions of communities or simple attached nodes to some communities. Current approaches have difficulties in identifying and clustering HNs. A density-based rough set model（DBRSM） is proposed by combining the virtue of densitybased algorithms and rough set models. It incorporates the macro perspective of the community structure of the whole network and the micro perspective of the local information held by HNs, which would facilitate the further ＂growth＂ of HNs in community. We offer a theoretical support for this model from the point of strength of the trust path. The experiments on the real-world and synthetic datasets show the practical significance of analyzing and clustering the HNs based on DBRSM. Besides, the clustering based on DBRSM promotes the modularity optimization.

关键词： density-based rough set model(DBRSM) overlapping community detection rough set hesitant node(HN) trust path

A Modified Certainty Coefficient Method(M-CF) for Debris Flow Susceptibility Assessment:A Case Study for the Wenchuan Earthquake Meizoseismal Areas

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Journal of Mountain Science 2014年第5期11卷 1286-1297页

作者： WANG jun YU Yan yang Shun LU Gui-hong ou Guo-qiang Key Laboratory of Mountain hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

In the meizoseismal areas hit by the China Wenchuan earthquake on May 12, 2008, the disasterprone environment has changed dramatically, making the susceptibility assessment of debris flow more complex and uncertain. After the earthquake, debris flow hazards occurred frequently and effective susceptibility assessment of debris flow has become extremely important. Shenxi gully in Du Jiangyan city, located in the meizoseismal areas, was selected as the study area. Based on the research of disaster-prone environment and the main factors controlling debris flow, the susceptibility zonations of debris flow were mapped using factor weight method(FW), certainty coefficient method(CF) and geomorphic information entropy method(GI). Through comparative analysis, the study showed that these three methods underestimated susceptible degree of debris flow when used in the meizoseismal areas of Wenchuan earthquake. In order to solve this problem, this paper developed a modified certainty coefficient method(M-CF) to reflect the impact of rich loose materials on the susceptible degree of debris flow. In the modified method, the distribution and area of loose materials were obtained by field investigations and postearthquake remote sensing image, and four data sets, namely, lithology, elevation, slop and aspect, wereused to calculate the CF values. The result of M-CF method is in agreement with field investigations and the accuracy of the method is satisfied. The method has a wide application to the susceptibility assessment of debris flow in the earthquake stricken areas.

关键词： Wenchuan earthquake Disaster-prone environment Debris flow Susceptibility assessment Modified certainty coefficient method(M-CF)

Recent Progress in Boosted PDT Induced Immunogenic Cell Death for Tumor Immunotherapy

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Chemical Research in Chinese Universities 2021年第1期37卷 83-89页

作者： LI jun ou Hanlin DING Dan State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Bioactive MaterialsMinistry of EducationCollege of Life SciencesNankai UniversityTianjin300071P.R.China

With the rapid development of materials science,photosensitive materials have been widely used in the field of immunogenic cell death(ICD),which was on account of the reactive oxygen species(ROS)generation by photosensitizer under light irradiation inducing cellular oxidative stress during the dying of *** researches related to photodynamic therapy(PDT)induced ICD were conducted and exhibited brilliant performance in cancer ***,a variety of different strategies for PDT induced ICD have been summarized and discussed to provide researchers more inspiration for cancer immunotherapy.

关键词： Photodynamic therapy Immunogenic cell death Damage-associated molecular pattern

Long runout mechanism of the Shenzhen 2015 landslide:insights from a two-phase flow viewpoint

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Journal of Mountain Science 2018年第10期15卷 2247-2265页

作者： QIAO Cheng ou Guo-qiang PAN Hua-li ouyang Chao-jun JIA yang Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China Key Laboratory of Mountain Surface Process and Hazards Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Anhui University of Science&Technology Huainan 232002China

A catastrophic landslide occurred at Hongao dumpsite in Guangming New District of Shenzhen, South China, on December 20, 2015. An estimated total volume of 2.73×106 m3 of construction spoils was mobilized during this event. The landslide traveled a long distance on a low-relief terrain. The affected area was approximately 1100 m in length and 630 m in width. This landslide made 33 buildings destroyed, 73 people died and 4 people lost. Due to the special dumping history and other factors, soil in this landfill is of high initial water content. To identify the major factors that attribute to the long runout character, a two-phase flow model of Iverson and George was used to simulate the dynamics of this landslide. The influence of initial hydraulic permeability, initial dilatancy, and earth pressure coefficient was examined through numerical simulations. We found that pore pressure has the most significant effect on the dynamic characteristics of Shenzhen landslides. Average pore pressure ratio ofthe whole basal surface was used to evaluate the degree of liquefaction for the sliding material. The evolution and influence factors of this ratio were analyzed based on the computational results. An exponential function was proposed to fit the evolution curve of the average pore pressure ratio, which can be used as a reasonable and simplified evaluation of the pore pressure. This fitting function can be utilized to improve the single-phase flow model.

关键词： Dynamics Landslide Long runout Pore pressure Two-phase

Associations of content and gene polymorphism of macrophage inhibitory factor-1 and chronic hepatitis C virus infection

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World Journal of Gastroenterology 2020年第41期26卷 6378-6390页

作者： Xun-jun yang Xiao-ou Wang Yao Chen Song-Dao Ye Department of Laboratory Medicine The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina Department of Pathology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325006Zhejiang ProvinceChina

BACKGRouND The expression of macrophage inhibitory factor-1(MIC-1) is increased in peripheral blood of patients with chronic hepatitis and liver cirrhosis. However, whether MIC-1 gene polymorphism is correlated with relevant diseases is not yet *** To explore the correlation between gene polymorphism in MIC-1 exon region and chronic hepatitis C virus(HCV) *** This case-control study enrolled 178 patients with chronic hepatitis C(CHC) in the case group, and 82 healthy subjects from the same region who had passed the screening examination comprised the control group. The genotypes of rs1059369 and rs1059519 loci in the MIC-1 gene exon were detected by DNA sequencing. Also, the MIC-1 level, liver function metrics, liver fibrosis metrics, and HCV RNA load were determined. Univariate analysis was used to compare the differences and correlations between the two groups with respect to these parameters. Multivariate logistic regression was used to analyze the independent relevant factors of *** The plasma MIC-1 level in the CHC group was higher than that in the control group(P oups(P ound between rs1059369 and rs1059519 loci, and significant difference was detected in the distribution of haplotype A-C between the CHC and control groups(P ound the MIC-1 leve

关键词： Hepatitis C virus Chronic infection Exon region Polymorphism Macrophage inhibitory factor-1 Case-control study

A new family of supramolecular multiferrocenyl rhomboids:Synthesis,characterization,and their electrochemical behavior

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Chinese Chemical Letters 2013年第6期24卷 471-474页

作者： Jiang-Kun ou-yang Li-jun Chen Lin Xu Cui-Hong Wang Hai-Bo yang Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of ChemistryEast China Normal University

Two novel,supramolecular,multiferrocenyl rhomboids 5 and 6 have been successfully constructed from newly designed 60 ferrocenyl donor precursor 1 via coordination-driven *** structures of all multiferrocenyl rhomboids were characterized by multinuclear NMR（~1H and ^（31）P）,CSI-TOF-MS, and PM6 semi-empirical molecular simulation,and their electrochemical behaviors have been investigated.

关键词： Supromolecular metallacycle Coordination-driven self-assembly Multiferrocenyl rhomboid Electrochemical behavior