Structure and morphological characteristics of polygonal salt crust, the West Juyan Lake, China

Guoming Zhang,Yuting Xiao,Mingzhu Xiang,Chang Hong,Bo-Tao Zhang,Lianyou Liu,Peijun Shi,Jifu Liu 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.3

Polygonal salt crust patches (PSCPs) in modern playas have critical hydrologic implications for arid areas, but the morphology and origin of these polygonal features are under debate. This study investigated the structure and morphological characteristics of crustal landforms in a modern playa located in the West Juyan Lake, western Inner Mongolia of China, through an integrated analysis of high-resolution remote sensing images obtained from Google Earth, pedestrian field surveys, and unmanned aerial vehicle photography. The study area covers approximately 2,650 ha and the number of salt crust patches was 3,491. Across this area, the coverage and number of salt crust patches varied with elevation and sedimentary environment. The results show that the polygonal patch pattern of the salt crust landforms was fractal, and similar polygonal patch perimeter to area ratios and landscape index values prevail in the study area. The wind erosion of material on the surface of the Gobi Desert, a mountain torrent alluvial fan, and material carried by seasonal river water probably provided the provenance of the regional salt crust landforms. The structure and morphological characteristics of salt crust in typical playas of the arid and semiarid region are important for better understanding their composition and sedimentary environment. This study can help reveal relevant information regarding environmental change and provide a reference for saline dust emissions from playas in arid areas.

An intelligent recoil controller for riser system based on fuzzy control theory

Liu Xiuquan,Liu Zhaowei,Wang Xianglei,Qiu Na,Zhang Nan,Chang Yuanjiang,Chen Guoming 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1

Riser recoil control is a complicated nonlinear control problem. An intelligent control methodology is proposed to control the complicated riser recoil response based on fuzzy control theory. A dynamic nonlinear model of drilling riser/tensioner coupling system is established for riser recoil analysis. The riser system is divided into several elements and the coupling effect between the riser and discharged mud is considered in the dynamic model. A fuzzy controller for the opening of the recoil control valve is designed for the riser recoil control. A comprehensive analysis method is proposed for riser recoil control simulation. Simulation results show that the designed fuzzy controller can effectively control the riser recoil response. The adaptability of the designed controller is also proved by the simulation results. The application of the designed controller can reduce the risk of accidents during riser recoil process.

Design and Analysis of Additive Manufactured Flexure Hinge with Large Stroke and High Accuracy

Guoming Yao,Peng-Bo Liu,Shuaishuai Lu,Peng Yan 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.7

Additive manufacturing technology has significant potential for the development of advanced compliant mechanisms for precision manipulations owing to the advantage of realizing complex monolithic structures. By overcoming the limitations of traditional manufacturing technologies, this study develops a novel spatial spiral-based flexure hinge that aims to have a large stroke and high accuracy. In particular, the ∞-shaped configuration was adopted along the width direction of the flexure hinge by adjusting the spiral diameters. Owing to the excellent deformation capability and geometric constraints of the spatial spiral structure, the developed flexure hinge is capable of deflecting up to 90° with a small axis drift. The stiff - ness model of the flexure hinge was derived based on the elastic beam theory to illustrate the load–deflection relationships. The characteristics of the flexure hinge were further verified by finite element simulations and experiments on an additive manufactured prototype. Compared with the traditional flexure hinge, the developed design demonstrates a higher range and accuracy of rotation and a better ability to preserve the rotation center position but smaller compliance, which demonstrates a significant potential for emerging applications, including optical adjustments, biomedical operations, and robot joints.

Missing Data Imputation Based on Grey System Theory

Guoming Sang,Kai Shi,Zhi Liu,Lijun Gao 보안공학연구지원센터 2014 International Journal of Hybrid Information Techno Vol.7 No.2

Nonlinear self-induced vibration and operability envelope analysis of production strings in marine natural gas development

Liu, Kang,Chen, Guoming,Zhu, Gaogeng,Zhu, Jingyu The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

Marine production strings are continuously affected by unstable internal fluid during operation. In this paper, the structural governing equation for marine production string self-induced vibration is constructed. A finite element analysis model is established based on Euler-Bernoulli theory and solved by the Newmark method. Furthermore, based on reliability theory, a self-design procedure is developed to determine the operability envelope for marine production string self-induced vibration. Case studies show: the response frequency of the production strings is consistent with the excitation frequency under harmonic fluctuation and mainly determined by the first-order natural frequency under stochastic fluctuation. The operability envelope for marine production string self-induced vibration is a near symmetrical trapezium. With the increasing of natural gas output, the permissible fluctuation coefficient dramatically decreases. A reasonable centralizer spacing, increasing top tension, and controlling natural gas output are of great significance to the risk control in marine production string operation.

An Algorithm of Association Rules Mining in Large Databases Based on Sampling

Zhi Liu,Tianhong Sun,Guoming Sang 보안공학연구지원센터 2013 International Journal of Database Theory and Appli Vol.6 No.6

Nonlinear self-induced vibration and operability envelope analysis of production strings in marine natural gas development

Kang Liu,Guoming Chen,Gaogeng Zhu,JINGYU ZHUANG 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

Marine production strings are continuously affected by unstable internal fluid during operation. In this paper, the structural governing equation for marine production string self-induced vibration is constructed. A finite element analysis model is established based on Euler-Bernoulli theory and solved by the Newmark method. Furthermore, based on reliability theory, a self-design procedure is developed to determine the operability envelope for marine production string self-induced vibration. Case studies show: the response frequency of the production strings is consistent with the excitation frequency under harmonic fluctuation and mainly determined by the first-order natural frequency under stochastic fluctuation. The operability envelope for marine production string self-induced vibration is a near symmetrical trapezium. With the increasing of natural gas output, the permissible fluctuation coefficient dramatically decreases. A reasonable centralizer spacing, increasing top tension, and controlling natural gas output are of great significance to the risk control in marine production string operation.

Amperometric Immunosensor for Myeloperoxidase in Human Serum Based on a Multi-wall Carbon Nanotubes-Ionic Liquid-Cerium Dioxide Film-modified Electrode

Lu, Lingsong,Liu, Bei,Liu, Chenggui,Xie, Guoming Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11

A label-free amperometric immunosensor has been proposed for the detection of myeloperoxidase (MPO) in human serum. To fabricate such an immunosensor, a composite film consisting of N,N-dimethylformamide (DMF), multiwall carbon nanotubes (MWCNTs) and 1-ethyl-3-methyl imidazolium tetrafluoroborate ($EMIMBF_4$) suspension was initially formed on a glassy carbon electrode (GCE). Then cerium dioxide ($CeO_2$) dispersed by chitosan was coated on the GCE. After that, MPO antibodies (anti-MPO) were attached onto the nano$CeO_2$ surface. With a noncompetitive immunoassay format, the antibody-antigen complex formed between the immobilized anti-MPO and MPO in sample solution. The immunosensor was characterized by cyclic voltammetry, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The factors influencing the performance of the immunosensor were studied in detail. Under optimal conditions, the current change before and after the immunoreaction was proportional to MPO concentration in the range of 5 to $300\;ng\;mL^{-1}$ with a detection limit of $0.2\;ng\;mL^{-1}$.

Amperometric Immunosensor for Myeloperoxidase in Human Serum Based on a Multi-wall Carbon Nanotubes-Ionic Liquid-Cerium Dioxide Film-modified Electrode

Lingsong Lu,Bei Liu,Chenggui Liu,Guoming Xie 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11

A label-free amperometric immunosensor has been proposed for the detection of myeloperoxidase (MPO) in human serum. To fabricate such an immunosensor, a composite film consisting of N,N-dimethylformamide (DMF), multiwall carbon nanotubes (MWCNTs) and 1-ethyl-3-methyl imidazolium tetrafluoroborate (EMIMBF4) suspension was initially formed on a glassy carbon electrode (GCE). Then cerium dioxide (CeO2) dispersed by chitosan was coated on the GCE. After that, MPO antibodies (anti-MPO) were attached onto the nanoCeO2 surface. With a noncompetitive immunoassay format, the antibody-antigen complex formed between the immobilized anti-MPO and MPO in sample solution. The immunosensor was characterized by cyclic voltammetry, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The factors influencing the performance of the immunosensor were studied in detail. Under optimal conditions, the current change before and after the immunoreaction was proportional to MPO concentration in the range of 5 to 300 ng mL‒1 with a detection limit of 0.2 ng mL‒1.

Investigating the Characteristics of Wet Shotcrete Pipeline Transportation

Lianjun Chen,Jiahao Sun,Xiaohan Guo,Nan Guo,Yanan Huang,Guoming Liu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.12

In order to study the resistance characteristics of wet shotcrete pipeline transportation, a small pipe type rheology and resistance test device was developed. The device is used for straight pipe resistance test, pump stop test and dyed concrete test were carried out on concrete with different characteristics. The fluidity changes of concrete with different characteristics were obtained through experiments. The results show that the slump, pressure bleeding rate, water-cement ratio were all negatively related to pipeline transportation resistance. The influence of the three factors on resistance was in order: pressure bleeding rate, water-cement ratio, slump. The dyed concrete test confirmed the principle of the plunger flow in the pipeline when concrete is pumped. The thickness of the lubricating layer increased with the increase of the water-cement ratio. The concrete pipeline transportation resistance increased with the increase of the standing time. The fitting curve was obtained through the correlation analysis between resistance and lubricating layer thickness, and the two were negatively correlated. This provides a new research idea for the study of drag reduction measures for concrete pipeline transportation.