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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.
Chao Li,Baihong Li,Guoming Gao,Lijun Zhang,Shu Zhang,Lei Zhang,Jun Xiang,Song Hu,Yi Wang,Xun Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Drying at 100 C is a common practice for processing many biomasses for their further thermochemicalconversion via the routes such as pyrolysis. The drying temperature of 100 C is low, but might not be toolow to cause any impact on pyrolytic behaviors of a biomass feedstock. In this study, varied scenarios ofthermal pretreatment of poplar sawdust (oven-drying, boiling in water and microwave heating) at 100 Cwere screened for probing their potential influence on the pyrolytic behaviors at 500 and 750 C. Comparing with oven-drying, boiling in water (cooking) and microwave heating at 100 C could removesome oxygen-containing species, increasing carbon content of the pretreated sawdust and promotingcarbonization in pyrolysis. This enhanced formation of biochar, heavy p-conjugated organics in bio-oil,but suppressed generation of gas. The cooking or microwave heating pretreatment also promoted aromatizationto form the biochar of higher thermal stability, higher crystallinity, and higher aromatic degree,due to the enhanced deoxygenation reactions in the pyrolysis. The in-situ IR characterization suggestedthat microwave pretreatment promoted generation of unsaturated ketones and also the species with olefinicC = C, favoring their further aromatization. The cooking pretreatment impacted transformationroutes of the oxygen-containing organics, thus modifying pyrolysis behaviors of the pretreated sawdust.
Identification of pepper genes involved in the response to CO 2 enrichment using RNA-Seq analysis
Jing Zhang,Rui Bai,Mengya Shang,Xiaoyong Xu,Hongxia Song,Shaowen Zheng,Leiping Hou,Meilan Li,Guoming Xing 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.1
Pepper is widely cultivated, and the application of CO 2 promotes photosynthesis and increases its yield. However, the molecularmechanisms underlying this are still unclear. In this study, the photosynthetic correlation indexes under elevated CO 2and control conditions were compared. The application of CO 2 increased the photosynthetic capacity of pepper. Moreover,RNA-Seq analysis was used to identify genes that were diff erentially expressed between pepper leaves grown in CO 2 -enrichedconditions and those grown in control conditions. The 149 diff erentially expressed genes (DEGs) were found to be involvedin photosynthesis and other metabolic processes. According to GO signifi cant enrichment analysis, the proteins encodedby the DEGs were mainly found to be located in the chloroplast, the chloroplast matrix, and the apoplast. According toKEGG signifi cant enrichment analysis, the DEGs were found to be involved in glutathione metabolism; starch and sucrosemetabolism; and stilbenoid, diarylheptanoid, gingerol, fl avonoid, and phenylpropanoid biosynthesis. The DEGs were alsoinvolved in the pentose phosphate pathway, carbon metabolism, and porphyrin and chlorophyll metabolism. Based on theGO annotation and the KEGG database analysis, ten of the DEGs identifi ed were suggested to be involved in photosynthesisand related processes; these genes were predicted to have roles in carbohydrate, soluble sugar, and glutathione metabolism,and in raffi nose, cysteine, nucleotide, and ABA biosynthesis. These DEGs are involved in the pentose phosphate pathwayand tricarboxylic acid cycle of carbon assimilation during photosynthesis. One of the DEGs was also found to be involved inchlorophyll biosynthesis. These results lay the foundation for further investigation of the molecular mechanisms and genesinvolved in the response to CO 2 enrichment in peppers.
Simulation and assessment of gas dispersion above sea from a subsea release: A CFD-based approach
Xinhong Li,Guoming Chen,Renren Zhang,Hongwei Zhu,Changhang Xu 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
This paper presents a comprehensive simulation and assessment of gas dispersion above sea from a subsea release using a Computational Fluid Dynamics (CFD) approach. A 3D CFD model is established to evaluate the behavior of flammable gas above sea, and a jack-up drilling platform is included to illustrate the effect of flammable gas cloud on surface vessels. The simulations include a matrix of scenarios for different surface release rates, distances between surface gas pool and offshore platform, and wind speeds. Based on the established model, the development process of flammable gas cloud above sea is predicted, and the dangerous area generated on offshore platform is assessed. Additionally, the effect of some critical factors on flammable gas dispersion behavior is analyzed. The simulations produce some useful outputs including the detailed parameters of flammable gas cloud and the dangerous area on offshore platform, which are expected to give an educational reference for conducting a prior risk assessment and contingency planning.
Simulation and assessment of gas dispersion above sea from a subsea release: A CFD-based approach
Li, Xinhong,Chen, Guoming,Zhang, Renren,Zhu, Hongwei,Xu, Changhang The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
This paper presents a comprehensive simulation and assessment of gas dispersion above sea from a subsea release using a Computational Fluid Dynamics (CFD) approach. A 3D CFD model is established to evaluate the behavior of flammable gas above sea, and a jack-up drilling platform is included to illustrate the effect of flammable gas cloud on surface vessels. The simulations include a matrix of scenarios for different surface release rates, distances between surface gas pool and offshore platform, and wind speeds. Based on the established model, the development process of flammable gas cloud above sea is predicted, and the dangerous area generated on offshore platform is assessed. Additionally, the effect of some critical factors on flammable gas dispersion behavior is analyzed. The simulations produce some useful outputs including the detailed parameters of flammable gas cloud and the dangerous area on offshore platform, which are expected to give an educational reference for conducting a prior risk assessment and contingency planning.
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.