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Zhou SD, Ren ZH, Yu YS, Liu Y, Du H, Lv XF, Yuan QL. Study of Sintering Behavior of Methane Hydrate Particles on the Wall Surface. Langmuir 2024; 40:6537-6549. [PMID: 38483278 DOI: 10.1021/acs.langmuir.4c00192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
The sintering of hydrate aggregates on the pipe wall is a major form of hydrate deposition. Understanding the sintering behavior of hydrates on the wall is crucial for promoting hydrate safety management and preventing pipeline blockage. However, limited research currently exists on this topic. In this study, the cohesive force strength of hydrate particles on the wall surface under different conditions was directly measured using a high-pressure micromechanical force device (HP-MMF). Subsequently, the effects of subcooling and glycine on the cohesive force were investigated. The results indicate that the cohesive force is influenced by different growth states during the process of free water on the wall surface gradually growing into hydrate. Three states with larger measured values during the growth process were selected for research. Observation showed that increased subcooling strengthened sintering by accelerating the growth rate of the hydrate film, resulting in a significant increase in cohesive force. The role of glycine in the methane hydrate system was then evaluated. Glycine was found to reduce the degree of sintering by reducing the growth rate of the hydrate film, thereby decreasing the cohesive force. The optimal concentration in the system was determined to be 0.25 wt %. Moreover, compared with low subcooling (1 °C), glycine had a better effect at high subcooling (5 °C). At 5 °C subcooling and the optimal concentration, the cohesive force in the wall droplet state decreases from 677.38 to 489.02 mN/m, the cohesive force at the low-saturation state decreases from 951.79 to 543.32 mN/m, and the cohesive force at the high-saturation state decreases from 1194.95 to 641.76 mN/m. These findings contribute to a better understanding of the cohesive force behavior of gas hydrate on the inner wall of the pipeline and provide basic data for reducing the risk of hydrate blockage.
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Affiliation(s)
- Shi-Dong Zhou
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
| | - Zhen-Hao Ren
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
| | - Yi-Song Yu
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
| | - Yang Liu
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
| | - Hui Du
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
| | - Xiao-Fang Lv
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
| | - Qiao-Ling Yuan
- Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, P. R. China
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Li N, Liang XR, Zhou SD, Dang LH, Li J, An GS, Ren K, Jin QQ, Liang XH, Cao J, Du QX, Wang YY, Sun JH. Exploring postmortem succession of rat intestinal microbiome for PMI based on machine learning algorithms and potential use for humans. Forensic Sci Int Genet 2023; 66:102904. [PMID: 37307769 DOI: 10.1016/j.fsigen.2023.102904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 03/02/2023] [Accepted: 06/05/2023] [Indexed: 06/14/2023]
Abstract
The microbial communities may undergo a meaningful successional change during the progress of decay and decomposition that could aid in determining the post-mortem interval (PMI). However, there are still challenges to applying microbiome-based evidence in law enforcement practice. In this study, we attempted to investigate the principles governing microbial community succession during decomposition of rat and human corpse, and explore their potential use for PMI of human cadavers. A controlled experiment was conducted to characterize temporal changes in microbial communities associated with rat corpses as they decomposed for 30 days. Obvious differences of microbial community structures were observed among different stages of decomposition, especially between decomposition of 0-7d and 9-30d. Thus, a two-layer model for PMI prediction was developed based on the succession of bacteria by combining classification and regression models using machine learning algorithms. Our results achieved 90.48% accuracy for discriminating groups of PMI 0-7d and 9-30d, and yielded a mean absolute error of 0.580d within 7d decomposition and 3.165d within 9-30d decomposition. Furthermore, samples from human cadavers were collected to gain the common succession of microbial community between rats and humans. Based on the 44 shared genera of rats and humans, a two-layer model of PMI was rebuilt to be applied for PMI prediction of human cadavers. Accurate estimates indicated a reproducible succession of gut microbes across rats and humans. Together these results suggest that microbial succession was predictable and can be developed into a forensic tool for estimating PMI.
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Affiliation(s)
- Na Li
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Xin-Rui Liang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Shi-Dong Zhou
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Li-Hong Dang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Jian Li
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Guo-Shuai An
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Kang Ren
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Qian-Qian Jin
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Xin-Hua Liang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Jie Cao
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Qiu-Xiang Du
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China
| | - Ying-Yuan Wang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China.
| | - Jun-Hong Sun
- School of Forensic Medicine, Shanxi Medical University, Jinzhong 030604, Shanxi, China.
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Guo Y, Huang YM, Huang J, Jin YZ, Jiang W, Liu PL, Liu FJ, Ma JX, Ma JY, Wang Y, Xie Z, Yin H, Zhao CS, Zhou SD, Zhang J, Zheng ZJ. [COVID-19 pandemic: global epidemiological trends and China's subsequent preparedness and responses]. Zhonghua Liu Xing Bing Xue Za Zhi 2020; 41:642-647. [PMID: 32164401 DOI: 10.3760/cma.j.cn112338-20200301-00222] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The outbreak of COVID-19 has spread quickly across 114 countries/territories/areas in six continents worldwide and has been announced as a pandemic by WHO. This study analyzed global COVID-19 epidemiological trends, examined impact of the pandemic on global health security, diplomacy, and social environment in China, and provided short- and long-term strategic policy recommendations for China's subsequent preparedness and responses.
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Affiliation(s)
- Y Guo
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - Y M Huang
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - J Huang
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - Y Z Jin
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - W Jiang
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - P L Liu
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - F J Liu
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - J X Ma
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - J Y Ma
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - Y Wang
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - Z Xie
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - H Yin
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - C S Zhao
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - S D Zhou
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - J Zhang
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
| | - Z J Zheng
- Institute for Global Health and School of Public Health, Peking University, Beijing 100191, China
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Lv XF, Zuo JW, Liu Y, Zhou SD, Lu DY, Yan KL, Shi BH, Zhao HJ. Experimental study of growth kinetics of CO2 hydrates and multiphase flow properties of slurries in high pressure flow systems. RSC Adv 2019; 9:32873-32888. [PMID: 35529764 PMCID: PMC9073301 DOI: 10.1039/c9ra06445a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 10/03/2019] [Indexed: 11/28/2022] Open
Abstract
The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation. In this paper, a high pressure flow loop equipped with visual window was used to study the growth process of hydrates in a pipe flow system and slurry flow characteristics. Deionized water, industrial white oil and CO2 were selected as the experiment medium. A series of experiments with different initial pressures (2.5–3 MPa), liquid loads (7–9 L), flow rates (25–35 kg min−1) and water cuts (60–100%) were designed and carried out. Specifically, hydrate formation and slurry flow characteristics in two different systems, pure water and oil–water emulsion system, were compared. Both of the systems experienced an induction stage, slurry flow stage and followed by a plugging stage. Although hydrate growth gradually ceased in the slurry flow stage, plugging still occurred due to the continuous agglomeration of hydrates. Visual observation showed that there were obvious stratification of the oil–water emulsion systems at the later time of slurry flow stage, which directly resulted in pipe blockage. The hydrate induction time of the flow systems gradually decreased with the increasing initial pressure, initial flow rate and water content. And the induction time tended to decrease first and then slowly increase with the increasing liquid loading. For emulsion systems, the apparent viscosity and friction coefficient of the hydrate slurry increased with the increasing water content, indicating that there were higher plugging risks compared to the pure water systems. Moreover, the results of sensitivity analysis showed that the water content was the main factor affecting the hydrate induction time, followed by the influence of liquid carrying capacity and flow rate, and the initial pressure had the least influence on the induction time. Conclusions obtained in this paper can provide some reference not only for the prevention and management of hydrates in pipelines, but also for the application of CO2 hydrate as a refrigerant. The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation.![]()
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Affiliation(s)
- Xiao-fang Lv
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Jiang-wei Zuo
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Yang Liu
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Shi-Dong Zhou
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Da-yong Lu
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Ke-le Yan
- SINOPEC Research Institute of Safety Engineering
- Qingdao
- China
- State Key Laboratory of Safety and Control for Chemicals
- Qingdao
| | - Bo-hui Shi
- National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology
- China University of Petroleum-Beijing
- Beijing
- China
| | - Hui-jun Zhao
- Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
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Wei CK, Zhou SD, Zhang JC. [Analysis of 57 cases of unilateral diseased lungs treated by pleuropneumonectomy]. Zhonghua Wai Ke Za Zhi 1988; 26:25-6, 60. [PMID: 3197533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Wei CK, Zhou SD, Zhang JC. [Surgical treatment of chronic empyema: analysis of 306 cases]. Zhonghua Wai Ke Za Zhi 1987; 25:157-9, 189. [PMID: 3622139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Zhou SD. [Use of the TLC scanning method in the study of the quality of Chinese patent medicines--the quantitative analysis of berberine in 5 Chinese patent medicines]. Zhong Yao Tong Bao 1985; 10:36-7, 30. [PMID: 3157477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Zhang CJ, Wang Y, Lu WQ, Li YM, Shen ZX, Li JX, Liu XC, Zhou SD, Gao JS. Study on cervical visual disturbance and its manipulative treatment. J TRADIT CHIN MED 1984; 4:205-10. [PMID: 6570150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Zhou SD. [Chronic tuberculous empyema treated by an improved intrapleural thoracoplasty: clinical report of 77 cases (author's transl)]. Zhonghua Jie He He Hu Xi Xi Ji Bing Za Zhi 1980; 3:224-5. [PMID: 7297340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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