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Effect of CO_(2)flooding in an oil reservoir with strong bottom-water drive in the Tahe Oilfield,Tarim Basin,Northwest China

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Energy Geoscience 2024年第1期5卷 230-233页

作者： Li Zhang haiying liao Maolei Cui R&D Center of Sustainable Development of Continental Sandstone Mature Oilfield Beijing100083China Petroleum Exploration and Production Research Institute SinopecBeijing100083China

The dissolution and diffusion of CO_(2)in oil and water and its displacement mechanism were investigated by laboratory experiment and numerical simulation for Block 9 in the Tahe oilfield,a sandstone oil reservoir with strong bottom-water drive in Tarim Basin,Northwest *** parameters were analyzed as solubility ratio of CO_(2)in oil,gas and water,interfacial tension,in-situ oil viscosity distribution,remaining oil saturation distribution,and oil *** results show that CO_(2)flooding could control water coning and increase oil *** the early stage of the injection process,CO_(2)expanded vertically due to gravity differentiation,and extended laterally under the action of strong bottom water in the intermediate and late *** CO_(2)got enriched and extended at the oil-water interface,forming a high interfacial tension zone,which inhibited the coning of bottom water to some extent.A miscible region with low interfacial tension formed at the gas injection front,which reduced the in-situ oil viscosity by about 50%.The numerical simulation results show that enhanced oil recovery(EOR)is estimated at 5.72%and the oil exchange ratio of CO_(2)is 0.17 t/t.

关键词： Strong bottom-water drive reservoir CO_(2)flooding Enhanced oil recovery Coning of bottom water Tahe oilfield Tarim Basin Northwest China

机器人高精度轨迹跟踪与运动控制方法关键技术研究

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科学技术创新 2024年第6期 208-211页

作者：彭九英廖海英张军湖南劳动人事职业学院湖南长沙

随着科技的迅速发展,机器人技术已经成为现代工业、医疗、服务等多个领域的核心技术,这些应用要求机器人不仅要有高度的操作精度,还要能在复杂和动态的环境中稳定工作。基于此,本文提出了一种结合优化算法和模糊控制的轨迹跟踪方法,旨... 详细信息

随着科技的迅速发展,机器人技术已经成为现代工业、医疗、服务等多个领域的核心技术,这些应用要求机器人不仅要有高度的操作精度,还要能在复杂和动态的环境中稳定工作。基于此,本文提出了一种结合优化算法和模糊控制的轨迹跟踪方法,旨在提高跟踪精度和控制的响应速度,相比于传统方法,在轨迹跟踪精度和控制稳定性方面表现更优,以期在各类机器人应用中实现更高的精确度、更好的适应性和更强的稳定性。

关键词：机器人高精度轨迹跟踪运动控制关键技术

斜外侧腰椎椎间融合术后疲劳现状及影响因素分析

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骨科 2024年第4期15卷 344-348页

作者：廖海英刘颖宁宁陈佳丽李佩芳张林蒲兴翠四川大学华西医院骨科/四川大学华西护理学院成都610041

目的调查斜外侧腰椎椎间融合术(OLIF)病人术后疲劳(POF)的发生率,并分析其影响因素。方法采用便利抽样法选取2023年1月至2023年8月于四川大学华西医院骨科进行OLIF手术的病人159例,术后第2天使用汉化版简明围术期疲劳评测量表(ICFS-10)... 详细信息

目的调查斜外侧腰椎椎间融合术(OLIF)病人术后疲劳(POF)的发生率,并分析其影响因素。方法采用便利抽样法选取2023年1月至2023年8月于四川大学华西医院骨科进行OLIF手术的病人159例,术后第2天使用汉化版简明围术期疲劳评测量表(ICFS-10)进行评估,将ICFS-10评分>24分的病人纳入术后疲劳组,ICFS-10评分≤24分的病人纳入无术后疲劳组。观察两组的匹兹堡睡眠指数(PSQI)、华西心晴指数(HEI)和疼痛数字评分量表(NRS)评分;对两组的临床资料进行单因素分析,将单因素分析中有统计学意义的影响因素纳入多因素二元Logistic回归模型中进行分析。结果159例病人ICFS-10评分为(26.92±2.75)分,有148例(93.08%)出现POF。两组病人的PSQI评分、合并症、NRS疼痛评分比较,差异均有统计学意义(P<0.05)。二元Logistic回归分析显示,合并症[OR=5.160,95%CI(1.286,20.710),P=0.021]和术后疼痛[OR=6.890,95%CI(1.864,25.465),P=0.004]是OLIF病人发生POF的危险因素。结论OLIF病人POF发生率较高,合并症和术后疼痛是OLIF病人术后发生POF的危险因素,围术期应加强病人睡眠管理、合并症管理以及实施积极有效的镇痛模式,降低POF的发生,加速病人术后康复。

关键词：微创手术腰椎手术术后疲劳恢复影响因素

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氮气在微米管中的微尺度流动端面效应

力学与实践 2023年第6期45卷 1375-1381页

作者：方欣廖海婴岳湘安中国石油化工股份有限公司石油勘探开发研究院北京102206 中国石油大学(北京)石油工程学院北京102249

在压力为5~20 MPa、温度为25~60℃范围内,开展了氮气在直径31~100μm管中的流动实验。提出了用于量化微尺度流动端面效应附加压差Δ_(pend)的双管长压差计算法。利用该方法,基于实验结果发现:Δ_(pend)与管径d负相关,而与流速v正相关。... 详细信息

在压力为5~20 MPa、温度为25~60℃范围内,开展了氮气在直径31~100μm管中的流动实验。提出了用于量化微尺度流动端面效应附加压差Δ_(pend)的双管长压差计算法。利用该方法,基于实验结果发现:Δ_(pend)与管径d负相关,而与流速v正相关。在低流速条件下压力对Δ_(pend)的影响不明显,而在高流速条件下Δ_(pend)随压力的升高而增大;在本文实验条件内,温度对Δ_(pend)的影响不明显。据此,建立了综合表征Δ_(pend)与d和v关系的微尺度流动端面附加压差的经验模型。

关键词：微尺度流动端面效应端面附加压差石英微管

Towards sustainable adversarial training with successive perturbation generation

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Frontiers of Information Technology & Electronic Engineering 2024年第4期25卷 527-539页

作者： Wei LIN Lichuan liao College of Computer Science and Mathematics Fujian University of TechnologyFuzhou 350118China College of Economics and Management Xi’an University of TechnologyXi’an 710048China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of TechnologyFuzhou 350118China

Adversarial training with online-generated adversarial examples has achieved promising performance in defending adversarial attacks and improving robustness of convolutional neural network ***,most existing adversarial training methods are dedicated to finding strong adversarial examples for forcing the model to learn the adversarial data distribution,which inevitably imposes a large computational overhead and results in a decrease in the generalization performance on clean *** this paper,we show that progressively enhancing the adversarial strength of adversarial examples across training epochs can effectively improve the model robustness,and appropriate model shifting can preserve the generalization performance of models in conjunction with negligible computational *** this end,we propose a successive perturbation generation scheme for adversarial training(SPGAT),which progressively strengthens the adversarial examples by adding the perturbations on adversarial examples transferred from the previous epoch and shifts models across the epochs to improve the efficiency of adversarial *** proposed SPGAT is both efficient and effective;e.g.,the computation time of our method is 900 min as against the 4100 min duration observed in the case of standard adversarial training,and the performance boost is more than 7%and 3%in terms of adversarial accuracy and clean accuracy,*** extensively evaluate the SPGAT on various datasets,including small-scale MNIST,middle-scale CIFAR-10,and large-scale *** experimental results show that our method is more efficient while performing favorably against state-of-the-art methods.

关键词： Adversarial training Adversarial attack Stochastic weight average Machine learning Model generalization

Optimization of ferroelectricity and endurance of hafnium zirconium oxide thin films by controlling element inhomogeneity

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Journal of Advanced Ceramics 2024年第7期13卷 1023-1031页

作者： Fei Yan Ke Cao Yang Chen Jiajia liao Min liao Yichun Zhou Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for Aerospace School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Xi’an Key Laboratory of Reconfigurable Chip and Materials School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China

Ferroelectric thin films based on HfO2 have garnered increasing attention worldwide,primarily due to their remarkable compatibility with silicon and scalability,in contrast to traditional perovskite-structured ferroelectric ***,significant challenges remain in their widespread commercial utilization,particularly concerning their notable wake-up effect and limited *** address these challenges,we propose a novel strategy involving the inhomogeneous distribution of Hf/Zr elements within thin films and explore its effects on the ferroelectricity and endurance of Hf_(0.5)Zr_(0.5)O_(2) thin *** techniques such as grazing incidence X-ray diffraction,transmission electron microscopy,and piezoresponse force microscopy,we investigated the structural characteristics and domain switching behaviors of these *** experimental results indicate that the inhomogeneous distribution of Hf/Zr contributes to improving the frequency stability and endurance while maintaining a large remnant polarization in Hf_(0.5)Zr_(0.5)O_(2) ferroelectric thin *** adjusting the distribution of Zr/Hf within the Hf_(0.5)Zr_(0.5)O_(2) thin films,significant enhancements in the remnant polarization(2Pr>35μC/cm2)and endurance(>109)along with a reduced coercive voltage can be ***,the fabricated ferroelectric thin films also exhibit high dielectric tunability(≥26%)under a low operating voltage of 2.5 V,whether in the wake-up state or *** study offers a promising approach to optimize both the ferroelectricity and endurance of HfO_(2)-based thin films.

关键词： ferroelectric capacitors thin films ferroelectricity hafnium zirconium oxide

Organic Brønsted Acid-Catalyzed Stereoselective Cationic RAFT Polymerization:The Effect of RAFT Agents

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Chinese Journal of Polymer Science 2024年第6期42卷 711-717页

作者： Zheng-Yi Zhang Zan Yang Yun liao Sai-Hu liao Key Laboratory of Molecule Synthesis and Function Discovery(Fujian Province University) College of ChemistryFuzhou UniversityFuzhou350108China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Beijing National Laboratory for Molecular Sciences Beijing100190China

The tacticity of vinyl polymers is a key factor affecting the properties of ***,organic Brønsted acids have been demonstrated as effective catalysts for the development of highly stereoselective cationic reversible addition-fragmentation chain transfer(RAFT)polymerizations of vinyl ethers,in which the use of RAFT agents could allow the control the molecular weight and tacticity of polymer products ***,the effect of RAFT agents on the tacticity-regulation remains elusive and lacks of *** this study,we synthesized four types of RAFT agents and evaluated their influence in the stereoselective cationic polymerization of isobutyl vinyl ether in the presence of PADI as a Brønsted acid catalyst,which unveils that the Z group of RAFT agents could not only affect the polydispersity of the products,but also exert a profound effect on the *** extensive screening of the RAFT agents,high stereoregularity(isotacticity,90%m)was obtained when using dithiocarbonate ester-type RAFT agents with a benzyloxy Z group.

关键词： Bronsted acid catalysis Stereoselective cationic polymerization RAFT polymerization Chain transfer agents Tacticity

Interface property of dissimilar Ti-6Al-4V/AA1050 composite laminate made by non-equal channel lateral co-extrusion and heat treatment

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Defence Technology（防务技术） 2024年第3期33卷 197-208页

作者： Juan liao Mengmeng Tian Xin Xue School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350116China

The purpose of this paper is to examine the effect of processing parameters and subsequent heat treatments on the microstructures and bonding strengths of Ti-6Al-4V/AA1050 laminations formed via a non-equal channel lateral co-extrusion *** microstructural evolution and growth mechanism in the diffusion layer were discussed further to optimize the bonding quality by appropriately adjusting process *** electron microscopes(SEM),energy dispersive spectrometer(EDS),and X-ray diffraction(XRD)were used to characterize interfacial diffusion *** shear test was used to determine the mechanical properties of the interfacial diffusion *** experimental results indicate that it is possible to co-extrusion Ti-6Al-4V/AA1050 compound profiles using non-equal channel lateral *** heat treatment processes affect the thickness of the diffusion *** the temperature and time of heat treatment increase,the thickness of the reaction layers increases ***,the shear strength of the Ti-6Al-4V/AA1050 composite interface is proportional to the diffusion layer *** is observed that a medium interface thickness results in superior mechanical performance when compared to neither a greater nor a lesser interface *** characterization of all heat treatments reveals that the only intermetallic compound observed in the diffusion layers is TiAl_(3).Due to the inter-diffusion of Ti and Al atoms,the TiAl_(3) layer grows primarily at AA1050/TiAl_(3) interfaces.

关键词： Shear strength Co-extrusion Heat treatment Microstructure Intermetallic compounds

Synergistic extraction and separation of thorium from rare earths in chloride media using mixture of Cextrant 230 and Cyanex 923

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Journal of Rare Earths 2024年第4期42卷 759-767页

作者： Hui Wang Shengting Kuang Wuping liao School of Rare Earths University of Science and Technology of ChinaHefei230026China Institute of Material and Chemistry Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou341000China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

In order to lower the usage of expensive Cyanex 923 and increase the extraction capacity of the system of Cextrant 230,the synergistic extraction of thorium from chloride media by a mixture of Cextrant 230 and Cyanex 923 was *** maximum synergistic enhancement coefficient(R)of 1.53 is obtained at 1:1 molar ratio of Cextrant 230/Cyanex *** syne rgistic extracted species of Th^(4+)is determined as ThCl_(4)·2Cextrant 230·Cyanex *** synergistic extraction of Th^(4+)is an entropy-driven exothermic *** loading capacity of 0.60 mol/L mixed extractant for thorium is about 17.10 g/L(calculated as ThO_(2)),and the loaded thorium in the organic phase can be effectively stripped by distilled *** comparison,rare earth cations are barely extracted under the similar conditions,suggesting that the mixtures can be applied to separate thorium from rare earths.A cascade extraction process was developed based on the synergistic extraction system to separate thorium from the hydrochloric acid leaching of *** content of thorium in the leaching solution decreases obviously from 19.90 mg/L to1.4μg/L by 3 stages of extraction,which is superior to sole Cextrant 230 or Cyanex *** introduction of Cextrant 230 into the extraction system not only lowers the usage of Cyanex 923 but also enhances the selective extraction of thorium at low acidity,implying that the synergistic extraction system can selectively extract thorium more efficiently and economically than the sole systems.

关键词： Synergistic extraction Cextrant 230 Cyanex 923 Thorium Rare earths