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Effect of stress-dependent microannulus aperture on well leakage

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journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1967-1976页

作者： Meng Meng Luke P.Frash j.William Carey Mohamed Mehana Wenfeng li Bailian Chen Earth and Environmental Sciences Los Alamos National LaboratoryLos AlamosNMUSA

Debonding at the cement-casing interface is recognized as a principal failure mechanism leading to CO_(2) leakage in *** detachment gives rise to a microannulus,which notably possesses greater permeability than undamaged cement,undermining its sealing ***,the permeability of the microannulus is regarded as a uniform value throughout the ***,fundamentally,a microannulus is one type of fracture,and its gap or aperture size is affected by the effective *** this work,we developed a unique experimental *** equipment facilitates the curing of cement inside a steel casing,the formation of a microannulus between the casing and the cement,and the investigation of the fluid flow dynamics along the microannulus under laboratory-replicated in situ *** microannulus was formed by injecting fluid from one end of the setup,and receiving similar amount of fluid on the other end signified the development of the leakage ***,strain gauges affixed to the casing’s external surface yielded key information on the microannulus’s opening and *** observed a noticeable decline in microannulus hydraulic aperture(or permeability)in relation to effective stress and an exponential equation fits their *** findings also indicate a distinct behavior when comparing liquid CO_(2) with ***,it is easier for liquid CO_(2) to create the ***,the hydraulic aperture range for this microannulus(0.7-6 mm)is considerably smaller than that created by water flow(2-17 mm).Finally,we integrated the stressdependent microannulus aperture size into the combined analysis of well mechanical integrity and well *** outcomes consistently demonstrated that when factoring in the stress-dependent aperture sizes,the leakage rates are 3e5 times compared to a fixed aperture *** traditional assumption of a constant aperture significantly underestimates fluid leakage risks.

关键词： Microannulus Leakage assessment Aperture size Triaxial experiment Carbon sequestration

Advanced Algorithm for Parameters Estimation of Negative Binomial Distribution with High Dimensional Sparse Group Structure

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journal of Systems Science & Complexity 2024年第5期37卷 2173-2195页

作者： li Meiqi jIN Baisuo School of Management University of Science and Technology of China

Negative binomial regression is a powerful technique for modeling count data, particularly when dealing with overdispersion. However, estimating the parameters for large-dimensional sparse models is challenging due to the complexity of optimizing the mean and dispersion parameter of the negative binomial distribution. To address this issue, the authors propose a novel approach that employs two iterations of the majorize-minimize(MM) algorithm, one for estimating the dispersion parameter and the other for estimating the mean parameters. These approaches improve the convergence speed and stability of the algorithm. The authors also use group penalty for variable selection, which enhances the accuracy and efficiency of the algorithm. The proposed method provides an explicit solution,simplifies the iteration process, and maintains good stability while ensuring algorithm ***, the authors apply the proposed algorithm to the zero-inflated model and demonstrate its promising predictive performance on specific data sets. The research has important implications for count data modeling and analysis in various fields, such as data mining, machine learning, and bioinformatics.

关键词： Group structure majorize-minimize (MM) negative binomial

深度学习重建为超低剂量胸部CT更好地检测肺结节

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国际医学放射学杂志 2022年第3期 362-362页

作者： B.jiang N.li X.Shi S.Zhang j.li G.H.deBock 朱慧媛

摘要超低剂量(ULD)CT可以促进大规模肺癌筛查的临床实施，同时最大限度地减少辐射剂量。然而，传统的图像重建方法与低剂量采集中的影像噪声有关。目的比较

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A Novel Tensor Decomposition-Based Efficient Detector for Low-Altitude Aerial Objects With Knowledge Distillation Scheme

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IEEE/CAA journal of Automatica Sinica 2024年第2期11卷 487-501页

作者： Nianyin Zeng Xinyu li Peishu Wu Han li Xin Luo Department of Instrumental and Electrical Engineering Xiamen UniversityXiamen 361005China IEEE College of Computer and Information Science Southwest UniversityChongqing 400715China

Unmanned aerial vehicles(UAVs) have gained significant attention in practical applications, especially the low-altitude aerial(LAA) object detection imposes stringent requirements on recognition accuracy and computational resources. In this paper, the LAA images-oriented tensor decomposition and knowledge distillation-based network(TDKD-Net) is proposed,where the TT-format TD(tensor decomposition) and equalweighted response-based KD(knowledge distillation) methods are designed to minimize redundant parameters while ensuring comparable performance. Moreover, some robust network structures are developed, including the small object detection head and the dual-domain attention mechanism, which enable the model to leverage the learned knowledge from small-scale targets and selectively focus on salient features. Considering the imbalance of bounding box regression samples and the inaccuracy of regression geometric factors, the focal and efficient IoU(intersection of union) loss with optimal transport assignment(F-EIoU-OTA)mechanism is proposed to improve the detection accuracy. The proposed TDKD-Net is comprehensively evaluated through extensive experiments, and the results have demonstrated the effectiveness and superiority of the developed methods in comparison to other advanced detection algorithms, which also present high generalization and strong robustness. As a resource-efficient precise network, the complex detection of small and occluded LAA objects is also well addressed by TDKD-Net, which provides useful insights on handling imbalanced issues and realizing domain adaptation.

关键词： Attention mechanism knowledge distillation(KD) object detection tensor decomposition(TD) unmanned aerial vehicles(UAVs)

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基于多参数MRI的影像组学列线图用于早期预测局部晚期胃癌对新辅助化疗的病理应答

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国际医学放射学杂志 2023年第3期 370-370页

作者： j.li H.K.Yin Y.Wang H.K.Zhang F.Ma H.L.li 程欣

摘要目的建立并验证一种基于多参数MRI(mpMRI)的影像组学列线图，用于早期预测局部晚期胃癌对新辅助化疗（NAC）的治疗反应。方法回顾性收集141例接受NAC后

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China’s participation in the international RRT for I_(c) measurement of superconducting cables organized by IEC/TC90

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Superconductivity 2022年第1期1卷 27-33页

作者： j.li Y.Shi G.M.Zhang L.W.jing j.X.Zheng C.L.liu W.Yuan Y.S.Wang M.Song Y.j.Xia X.H.Zong Y.W.Han D.N.Zheng X.j.Zhou T.Matsushita G.Nishijima The Institute of Physics Chinese Academy of SciencesBeijing 100190China The Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China The Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Eastern Superconductor Science&Technology(Suzhou)Co LtdSuzhou 215299China Guangdong Power Grid Corporation Guangzhou 510630China Shanghai International Superconductor Technology Co LtdShanghai 200444China Department of Computer Science and Electronics Kyushu Institute of Technology Iizuk1Japan National Institute for Materials Scienc5 Tsukuba 305-0003Japan

Currently,IEC/TC90 is working on standardizing the method for measuring critical current(Ic)in superconducting *** the end of 2020,an international round robin test(RRT)was organized,in which five Chinese institutions participated,and four accomplished the *** electric-field versus current(E-I)curves obtained by each institution are highly *** obtained by different institutions are nearly identical after appropriate curve averaging,indicating high reproducibility,except the last participant's inner core *** discrepancy was later determined to be the result of sample cable *** excluding highly deviated data,it is determined that the maximum relative standard uncertainty in I_(c) is 0.7%,and the maximum relative standard uncertainty in n-value is 12.8%.The I_(c)values are comparable to japan's domestic RRT results,but the n-values are significantly *** test results support the DC four-terminal method as a recommended test method,with a target relative uncertainty of less than 2%for the Ic value.

关键词： Superconducting cable Round robin test Standardization

Boosting High-Voltage Practical lithium Metal Batteries with Tailored Additives

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Nano-Micro Letters 2024年第12期16卷 23-41页

作者： jinhai You Qiong Wang Runhong Wei li Deng Yiyang Hu li Niu jingkai Wang Xiaomei Zheng junwei li Yao Zhou jun-Tao li College of Energy Xiamen UniversityXiamen 361005People’s Republic of China Magnetism Key Laboratory of Zhejiang Province College of Materials and ChemistryChina Jiliang UniversityHangzhou 310018People’s Republic of China Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU Leuven3001 LeuvenBelgium State Key Lab of Physical Chemistry of Solid Surface College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005People’s Republic of China Department of Chemical Engineering KU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070GansuPeople’s Republic of China

The lithium(li)metal anode is widely regarded as an ideal anode material for high-energy-density ***,uncontrolled li dendrite growth often leads to unfavorable interfaces and low Coulombic efficiency(CE),limiting its broader ***,an ether-based electrolyte(termed FGN-182)is formulated,exhibiting ultra-stable li metal anodes through the incorporation of liFSI and liNO3 as dual *** synergistic effect of the dual salts facilitates the formation of a highly robust SEI film with fast li+transport ***,li||Cu half cells exhibit an average CE reaching up to 99.56%.In particular,pouch cells equipped with high-loading lithium cobalt oxide(LCO,3 mAh cm^(-2))cathodes,ultrathin li chips(25μm),and lean electrolytes(5 g Ah-1)demonstrate outstanding cycling performance,retaining 80%capacity after 125 *** address the gas issue in the cathode under high voltage,cathode additives 1,3,6-tricyanohexane is incorporated with FGN-182;the resulting high-voltage LCO||li(4.4 V)pouch cells can cycle steadily over 93 *** study demonstrates that,even with the use of ether-based electrolytes,it is possible to simultaneously achieve significant improvements in both high li utilization and electrolyte tolerance to high voltage by exploring appropriate functional additives for both the cathode and anode.

关键词： li metal anode li dendrites liNO_(3) 1,3,6-tricyanohexane Pouch cells

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内耳解剖变异可能是单侧梅尼埃病而非同侧迟发性内淋巴积水的易感因素

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国际医学放射学杂志 2022年第4期 491-491页

作者： P.Lei Y.M.Leng j.li R.H.Zhou B.liu 张晓涵

摘要目的评估同侧迟发型内淋巴积水（DEH）及单侧梅尼埃病（MD）MRI测量所见的影像解剖变异，探讨该变异在不同亚型水肿性耳病中的作用。方法纳入28例同侧

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胰岛素瘤的检出:采用平均时相图像计算的胰腺一站式灌注CT可以替代双期扫描结合灌注扫描

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国际医学放射学杂志 2020年第5期 625-625页

作者： j.li X.Y.Chen K.Xu L.Zhu M.He T.Sun 霍萌 Department of Radiology Peking Union Medical College Hospital Peking Union Medical College Chinese Academy of Medical Sciences

摘要目的评估采用平均时相(MT)成像的胰腺一站式灌注CT替代双期扫描结合灌注扫描在检测胰岛素瘤中的可行性。材料与方法回顾性纳入45例可疑胰岛素瘤病人,所

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