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Experimental investigation of dynamic characteristics of leaching tubing for solution mining of salt cavern carbon and energy storage

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Petroleum Science 2024年第4期21卷 2703-2722页

作者： yin-ping li Xin-Bo Ge Xi-lin Shi Hong-ling Ma State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiChina College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590ShandongChina State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590ShandongChina University of Chinese Academy of Sciences Beijing100049China

Salt caverns are extensively utilized for storing various substances such as fossil energy,hydrogen,compressed air,nuclear waste,and industrial solid *** China,when the salt cavern is leached through single-well water solution mining with oil as a cushion,engineering challenges arise with the leaching tubing,leading to issues like damage and *** problems significantly hinder the progress of cavern construction and the control of cavern *** primary cause of this is the flowinduced vibration instability of leaching tubing within a confined space,which results in severe bending or damage to the *** study presents a model experimental investigation on the dynamic characteristics of leaching tubing using a self-developed liquid-solid coupling physical model experiment *** experiment utilizes a silicone-rubber pipe(SRP)and a polycarbonate pipe(PCP)to examine the effects of various factors on the dynamic stability of cantilevered pipes conveying *** factors include external space constraint,flexural rigidity,medium outside the pipe,overhanging length,and end *** experiments reveal four dynamic response phenomena:water hammer,static buckling,chaotic motion,and flutter *** study further demonstrates that the length of the external space constraint has a direct impact on the flutter critical flow velocity of the cantilevered pipe conveying ***,the flutter critical flow velocity is influenced by the end conditions and different external media.

关键词： Salt cavern storage Solution mining Leaching tubing Experimental investigation Flutter instability

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Theoretical research on gas seepage in the formations surrounding bedded gas storage salt cavern

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Petroleum Science 2022年第4期19卷 1766-1778页

作者： Xiang-Sheng Chen yin-ping li Ya-Long Jiang Yuan-Xi liu Tao Zhang State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong UniversityNanchang 330013Jiangxi China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071 HubeiChina University of Chinese Academy of Sciences Beijing 100049China

When constructing salt cavern gas or petroleum storage in lacustrine sedimentary salt formations rich in mudstone interlayers, the influence of the sealing performance of interlayers and salt-mud interface on the storage tightness should be considered adequately. In order to reveal the gas seepage in deep formations surrounding bedded salt cavern underground storage, a leakage analysis model was established based on the characteristics of a low dip angle and the interbedded structure of bedded rock salt. The gas seepage governing equations for one-dimensional and plane radial flow were derived and solved. A gas seepage simulation experiment was conducted to demonstrate the accuracy and reliability of the theoretical calculation results. The error of the seepage range was approximately 6.70%, which is acceptable. The analysis and calculation results indicate that the motion equation of gas in deep formations satisfies a non-Darcy's law with a threshold pressure gradient and slippage effect. The sufficient condition for the gas flow to stop is that the pressure gradient is equal to the threshold pressure *** relationship between the leakage range and operating time is a positive power function, that is, the leakage range gradually increases with time and eventually stabilizes. As the seepage range increases, the seepage pressure decreases sharply during the early stage, and then decreases gradually until the flow *** the research results with engineering applications, three quantitative evaluation indexes named the maximum admissible leakage range, leakage volume and leakage rate are proposed for the tightness evaluation of gas storage salt cavern during their operating stage. These indexes can be used directly in actual engineering applications and can be compared with the key design parameters stipulated in the relevant specifications. This work is expected to provide theoretical and technical support for the gas loss and tightness evaluation of

关键词： Gas storage salt cavern Seepage Tightness Non-Darcy's law Leakage

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Effect of Farming Practices on the Variability of Phosphorus Status in Intensively Managed Soils

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Pedosphere 2015年第3期25卷 438-449页

作者： SUN Wei-Xia HUANG Biao QU Ming-Kai TIAN Kang YAO li-Peng FU Ming-Ming yin li-ping Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of Sciences Soil and Fertilizer Technology Extension Center Bureau of Agriculture of Rugao County

Phosphorus(P) in agricultural soils is an important factor for soil quality and environmental protection. Understanding of P and its fractions in soils on a regional scale is imperative for effective management or utilization of P and the improvement of P availability in soils. To study spatial variability and changes of soil P and its fractions as affected by farming practices, soil samples were taken in Rugao County, Jiangsu Province of China, an intensive agricultural area in the Yangtze River Delta region, in years of 1982(n = 1 514), 1997(n = 1 651), and 2002(n = 342). High spatial variabilities of Olsen P and total P(TP) were observed throughout the study area. Loamy Stagnic Anthrosols and clay or loamy Aquic Cambosols had significantly higher concentrations of Olsen P and TP than sandy Ustic Cambosols and Aquic Cambosols. Olsen P and TP were increased from 1982 to 2002. The accumulations of Olsen P and TP in the cultivated soils were likely related to the increased application of P fertilizer, organic input,and soil incorporation of crop residues as well as conversion of soil use. Accumulated soil P was dominantly in labile and semi-labile P fractions. These P fractions may be utilized by future crop production by adjusting management practices, but they also pose a serious threat to nearby water bodies. Future strategies should include decreasing P fertilization in soils and supporting sustainable management. The information from this study can be used to monitor changes in soil fertility and environmental risks so that the use of fertilizers can become more rational.

关键词： agriculture management Olsen phosphorus phosphorus availability phosphorus fractionation total phosphorus

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Assessment of the hepatic microvascular changes in liver cirrhosis by perfusion computed tomography

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World Journal of Gastroenterology 2009年第28期15卷 3532-3537页

作者： Mai-lin Chen Qing-Yu Zeng Jian-Wei Huo Xiao-Ming yin Bao-ping li Jian-Xin liu Department of Radiology ChinaMeitan General Hospital No. 29 Xibahe Nanli ChaoyangDistrict Beijing 100028 China

AIM： TO assess the hepatic microvascular parameters in patients with liver cirrhosis by perfusion computed tomography （CT）. METHODS： Perfusion CT was performed in 29 patients without liver disease （control subjects） and 39 patients with liver cirrhosis, including 22 patients with compensated cirrhosis and 17 patients with decompensated cirrhosis, proved by clinical and laboratory parameters. CT cine-scans were obtained over 50 s beginning with the injection of 50 mL of contrast agent. Hepatic microvascular parameters, mean transit time （MTT） and permeability surface area product （PS） were obtained with the Perfusion 3 software （General Electric, ADW 4.2）. RESULTS： The overall differences of MTT and PS between control subjects, patients with compensated cirrhosis and those with decompensated cirrhosis were statistically significant （P = 0.010 and P = 0.002, respectively）. MTT values were 15.613 ± 4.1746 s, 12.592 ± 4.7518 s, and 11.721 ± 4.5681 s for the three groups, respectively, while PS were 18.945 ± 7.2347 mL/min per 100 mL, 22.767 ± 8.3936 mL/min per 100 mL, and 28.735 ± 13.0654 mL/min per 100 mL. MTT in decompensated cirrhotic patients were significantly decreased compared to controls （P = 0.017）, whereas PS values were remarkably increased （P = 0.001）.CONCLUSION： The hepatic microvascular changes in patients with liver cirrhosis can be quantitatively assessed by perfusion CT. Hepatic microvascular parameters （MTr and PS）, as measured by perfusion CT, were significantly altered in decompensated cirrhosis.

关键词： Tomography X-ray computed Hepaticmicrocirculation Cirrhosis

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Influence of Inhomogeneity on Critical Behavior of Earthquake Model on Random Graph

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Communications in Theoretical Physics 2006年第2X期46卷 261-264页

作者： ZHANG Duan-Ming SUN Fan YU Bo-Ming PAN Gui-Jun yin Yah-ping li Rui SU Xiang-ying Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We consider the earthquake model on a random graph. A detailed analysis of the probability distribution of the size of the avalanches will be given. The model with different inhomogeneities is studied in order to compare the critical behavior of different systems. The results indicate that with the increase of the inhomogeneities, the avalanche exponents reduce, i.e., the different numbers of defects cause different critical behaviors of the system. This is virtually ascribed to the dynamical perturbation.

关键词： self-organized criticality earthquake model critical behavior power-law finite size scaling random network

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Self-organized Criticality in an Earthquake Model on Random Network

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Communications in Theoretical Physics 2006年第2期45卷 293-296页

作者： ZHANG Duan-Ming SUN Fan YU Bo-Ming PAN Gui-Jun SUN Hong-Zhang yin Yah-ping li Rui SU Xiang-ying Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

A simplified Olami-Feder-Christensen model on a random network has been studied. We propose a new toppling rule -- when there is an unstable site toppling, the energy of the site is redistributed to its nearest neighbors randomly not averagely. The simulation results indicate that the model displays self-organized criticality when the system is conservative, and the avalanche size probability distribution of the system obeys finite size scaling. When the system is nonconservative, the model does not display scaling behavior. Simulation results of our model with different nearest neighbors q is also compared, which indicates that the spatial topology does not alter the critical behavior of the system.

关键词： self-organized criticality earthquake model finite size scaling random network

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新时代教师的应然作为:主动适应学习新样态

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教育理论与实践 2020年第26期40卷 30-33页

作者：尹利萍北京大学教育学院北京100871

教师是学习活动的组织者和学生学习的主导者,在当下学习新变化中教师必须要摆正态度,主动适应学习新样态,才能完成自身的教育使命,促进教育事业的发展,使自身的职责功能有效发挥,最终达成自己的工作目标。但在实践中,由于多种因素制约,... 详细信息

教师是学习活动的组织者和学生学习的主导者,在当下学习新变化中教师必须要摆正态度,主动适应学习新样态,才能完成自身的教育使命,促进教育事业的发展,使自身的职责功能有效发挥,最终达成自己的工作目标。但在实践中,由于多种因素制约,部分教师的实践表现还存在被动适应、缺乏技巧、引领主导不足、全面统筹缺失等问题。教师对于学习新样态的实践作为是其思想认识、认知视野、知识技能、心理状态等多种因素共同作用的结果。新时代教师主动适应学习新样态的思路是:做好全面思想准备,形成应对学习新样态的主动状态;加强知识技能学习,奠定从容应对学习新样态的基础;确定自身主导地位,培育应对学习新样态的引领思维;扩大思想认识格局,形成把握学习新样态的整体视野。

关键词：新时代教师学习新样态主动适应思想准备知识技能主导地位认识格局

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我国民办高校“股份制+双法人”治理模式研究

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黑龙江高教研究 2019年第6期37卷 1-5页

作者：尹利萍北京大学大连工业大学

我国民办高校的组织属性兼顾教育公益性和投资营利性特征。在实践中,民办高校投资人直接参与高校法人治理是一种常态。投资人直接参与民办高校法人治理,强化了投资营利性和教育公益性的冲突,与《民办教育促进法》的立法宗旨相悖。"股份... 详细信息

我国民办高校的组织属性兼顾教育公益性和投资营利性特征。在实践中,民办高校投资人直接参与高校法人治理是一种常态。投资人直接参与民办高校法人治理,强化了投资营利性和教育公益性的冲突,与《民办教育促进法》的立法宗旨相悖。"股份制+双法人"治理模式是民办高校法人治理的新探索,"股份制+双法人"治理可以淡化投资人直接控制民办高校,有助于保障民办高校法人的独立地位,加上其具有较强的融资能力,还能够使得创办人(出资人)的价值和权益得到明确保障,更能够克服传统家族式管理的不足。"股份制+双法人"模式在法律的规制下,教育公益性和投资营利性得到最大限度的平衡,但其治理机能还需要进一步完善。因此,需要改革理事会模式,推进利益相关者共同治理。此外,还需要进一步完善民办高校法人治理结构中的分权和制衡机制,保障民办高校的可持续发展。

关键词：民办高校 “股份制+双法人” 治理

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反相高效液相色谱法测定芦丁中槲皮素的含量

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安徽农业科学 2011年第16期39卷 9588-9589页

作者：尹丽平青岛盛瑞德实业有限公司山东青岛266100

[目的]建立反相高效液相色谱法（RP-HPLC）测定芦丁中槲皮素含量的方法。[方法]用C18（250 mm×4.6 mm）色谱柱,流动相为水-乙腈-冰乙酸（1 060∶350∶45,V∶V∶V）,流速为1.0 ml/min,检测波长为254 nm。[结果]采用水-乙腈-冰乙酸系统... 详细信息

[目的]建立反相高效液相色谱法（RP-HPLC）测定芦丁中槲皮素含量的方法。[方法]用C18（250 mm×4.6 mm）色谱柱,流动相为水-乙腈-冰乙酸（1 060∶350∶45,V∶V∶V）,流速为1.0 ml/min,检测波长为254 nm。[结果]采用水-乙腈-冰乙酸系统为流动相,分离效果好,峰型好,分离时间短,计算结果准确;以甲醇为溶媒提取时间短,提取杂质少。槲皮素含量在4~12 mg/L范围内呈良好的线性关系,回归方程Y=1 285X＋3 645,平均回收率为99%。所测样品芦丁中槲皮素的含量平均为0.813 g/ml。[结论]采用RP-HPLC测定芦丁中槲皮素含量简便、灵敏、准确、重复性好,可作为质量和生产控制的有效方法。

关键词：反相高效液相色谱法芦丁槲皮素含量

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纤维编织网增强混凝土加固RC柱抗震性能的影响因素

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浙江大学学报（工学版） 2017年第5期51卷 904-913,930页

作者：尹世平李耀杨扬叶桃中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州221116 中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室力学与土木工程学院江苏徐州221116

为了研究纤维编织网增强混凝土(TRC)加固钢筋混凝土(RC)柱的抗震性能,对9根TRC加固RC方柱进行了低周往复加载试验,分析加固层数、搭接长度、配箍率、轴压比对柱子抗震性能的影响.结果表明:在一定层数内,随着加固层数的增加,柱的开裂和... 详细信息

为了研究纤维编织网增强混凝土(TRC)加固钢筋混凝土(RC)柱的抗震性能,对9根TRC加固RC方柱进行了低周往复加载试验,分析加固层数、搭接长度、配箍率、轴压比对柱子抗震性能的影响.结果表明:在一定层数内,随着加固层数的增加,柱的开裂和屈服荷载无明显变化,而峰值荷载、位移延性系数、耗能能力呈上升趋势;在满足锚固要求下,纤维编织网搭接长度对柱抗震性能的影响不明显;随着配箍率增加或轴压比减小,柱的延性系数和耗能能力有所提高,刚度退化速率降低.总之,TRC能有效约束RC柱核心区混凝土,降低试件塑性铰区的破坏高度,改善RC柱的破坏形态.

关键词：纤维编织网增强混凝土(TRC) 抗震性能加固层数搭接长度配箍率轴压比

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