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Microstructure Characterization of Bubbles in Gassy Soil Based on the Fractal Theory

Journal of Ocean University of China 2024年第1期23卷 129-137页

作者： WU Chen LIN guoqing LIU Lele LIU Tao LI Chengfeng GUO Zhenqi Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266237China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Qingdao National Laboratory for Marine Science and Technology Qingdao 266237China

The microscopic characterization of isolated bubbles in gassy soil plays an important role in the macroscopic physical properties of sediments and is a key factor in the study of geological hazards in gas-bearing *** on the box-counting method and the pore fractal features in porous media,a fractal model of bubble microstructure parameters in gassy soil under different gas con-tents and vertical load conditions is established by using an industrial X-ray CT scanning *** results show that the fractal di-mension of bubbles in the sample is correlated with the volume fraction of bubbles,and it is also restricted by the vertical *** three-dimensional fractal dimension of the sample is about 1 larger than the average two-dimensional fractal dimension of all the slices from the same *** uniform porous media fractal model is used to test the equivalent diameter,and the results show that the variation of the measured pore diameter ratio is jointly restricted by the volume fraction and the vertical *** addition,the measured self-similarity interval of the bubble area distribution is tested by the porous media fractal capillary bundle model,and the fitting curve of measured pore area ratio in a small loading range is obtained in this paper.

关键词： gassy soil bubble microstructure parameters fractal dimension vertical load

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全液压钻机动力头浮动液压模块设计探讨

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机床与液压 2016年第10期44卷 97-99页

作者：于国庆青岛前哨矿山技术装备有限责任公司山东青岛266045

针对全液压钻机在上卸扣时动力头浮动的要求,分3种方案探讨液压模块设计的合理性和可操作性,希望对全液压钻机液压系统的设计提供一些启发,并共同探讨更加实用、更加可靠、更加高效的设计方案。

关键词：全液压钻机动力头浮动阀控系统先导控制

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复命知和:老子对“常”的哲学升华与理论展开

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社会科学战线 2021年第6期312卷 40-47页

作者：于国庆詹石窗四川大学道教与宗教文化研究所四川成都610064

《老子》中多次出现的"常"字,俨然已成为其思想体系中一个重要术语。基于特定的文化渊源和社会实践,老子对"常"的哲学升华主要表现为相互联系的三个方面:第一,以"复命曰常"立论,不但指明了"常"所具有的客观性和必然性,更在内容上指出"常... 详细信息

《老子》中多次出现的"常"字,俨然已成为其思想体系中一个重要术语。基于特定的文化渊源和社会实践,老子对"常"的哲学升华主要表现为相互联系的三个方面:第一,以"复命曰常"立论,不但指明了"常"所具有的客观性和必然性,更在内容上指出"常"乃是对生命本原的回归与复初;第二,主张"知和曰常",指出"和"作为本质规定性的生命状态,乃是万事万物发展演化的"常态"和"长态";第三,强调"知常习常",彰显鲜明的实践指向。

关键词：老子常复命知和知常习常

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纤维/高强混凝土抗冻性能试验

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复合材料学报 2019年第8期36卷 1977-1983页

作者：李趁趁胡婧元成方于国卿郑州大学土木工程学院郑州450001 水利部黄河水利委员会黄河水利科学研究院郑州450003

通过纤维/高强混凝土快速冻融循环试验,从试件外观损伤形态、相对动弹性模量、抗冻等级、抗冻耐久性指数角度,研究了不同纤维体积分数的玄武岩纤维、纤维素纤维和不同纤维长度的玄武岩纤维对C60高强混凝土抗冻性能的影响。结果表明,加... 详细信息

通过纤维/高强混凝土快速冻融循环试验,从试件外观损伤形态、相对动弹性模量、抗冻等级、抗冻耐久性指数角度,研究了不同纤维体积分数的玄武岩纤维、纤维素纤维和不同纤维长度的玄武岩纤维对C60高强混凝土抗冻性能的影响。结果表明,加入玄武岩或纤维素纤维可改善C60高强混凝土的外观剥落损伤程度。C60高强混凝土的抗冻性均随玄武岩纤维(长度为18mm)和纤维素纤维体积分数的增大而提高,在体积分数0.10vol%~0.20vol%内,前者的提高程度远大于后者,玄武岩纤维/高强混凝土能在更严酷的寒冷环境中满足更久的使用时间。玄武岩纤维长度的改变对C60高强混凝土的抗冻性影响较大,相对于18mm长度,6mm和30mm长度的玄武岩纤维对C60高强混凝土抗冻性能改善作用很有限。

关键词：玄武岩纤维纤维素纤维纤维/高强混凝土抗冻性能冻融循环相对动弹性模量

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困扰约旦的叙利亚难民问题

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阿拉伯世界研究 2019年第5期 61-76,119页

作者：余国庆陈瑶中国社会科学院西亚非洲研究所北京100007 中国社会科学院大学(研究生院) 北京102488

2011年初叙利亚危机爆发后,约旦迅速受到波及,叙利亚难民不断涌入。起初,约旦开放边境,允许难民进入,进而成为第三大叙利亚难民接收国。此后,约旦一度收紧边界,管控难民涌入。大量叙利亚难民滞留进一步加剧了约旦早已暴露出来的经济、... 详细信息

2011年初叙利亚危机爆发后,约旦迅速受到波及,叙利亚难民不断涌入。起初,约旦开放边境,允许难民进入,进而成为第三大叙利亚难民接收国。此后,约旦一度收紧边界,管控难民涌入。大量叙利亚难民滞留进一步加剧了约旦早已暴露出来的经济、社会问题并增加了约旦面临的潜在安全风险。由于国际社会对约旦治理难民问题的支持不足,以及难民安置与遣返的进展迟滞,导致约旦境内的叙利亚难民问题呈现出长期化趋势。中东变局和叙利亚危机爆发八年多来,虽然约旦局势总体保持稳定,但国内的经济状况仍然没有明显好转。叙利亚难民问题正在成为影响约旦政治稳定和社会与经济发展的重要潜在因素。

关键词：约旦叙利亚难民政治不稳定

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AutoCAD故障排除与使用技巧

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计算机应用 1999年第3期19卷 56-57页

作者：于国清哈尔滨建筑大学

本文作者结合自己使用和开发ＡｕｔｏＣＡＤ的经验，介绍几例ＡｕｔｏＣＡＤ故障的排除和选择集过滤器的使用，以期读者能够在上面舒畅、高效地工作。１故障排除１．１屏幕上的图形全部消失故障特征将ＡｕｔｏＣＡＤＲ１２ｆｏｒＷｉｎ... 详细信息

本文作者结合自己使用和开发ＡｕｔｏＣＡＤ的经验，介绍几例ＡｕｔｏＣＡＤ故障的排除和选择集过滤器的使用，以期读者能够在上面舒畅、高效地工作。１故障排除１．１屏幕上的图形全部消失故障特征将ＡｕｔｏＣＡＤＲ１２ｆｏｒＷｉｎｄｏｗｓ安装在Ｗｉｎｄｏｗｓ９５下...

关键词： AutoCAD 绘图软件故障排除应用程序

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Metal organic frameworks-based cathode materials for advanced Li-S batteries: A comprehensive review

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Nano Research 2024年第4期17卷 2592-2618页

作者： Zhengkun Xie Boyong Cao Xiyan yue Ruixue Wang Ziqian Xue Jiajia Wang guoqing Guan Weihua Chen College of Chemistry Zhengzhou UniversityZhengzhou 450001China School of Ecology and Environment Zhengzhou UniversityZhengzhou 450001China School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China Laboratory of Energy Conversion Engineering Institute of Regional InnovationHirosaki University3 Bunkyo-choHirosakiAomori 036-8561Japan Institute for Integrated Cell-Material Sciences(iCeMS) Kyoto UniversitySakyo-kuKyoto 606-8501Japan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Li-S batteries(LSBs)have been considering as new and promising energy storage systems because of the high theoretical energy density and low ***,their practical application is inhibited by several factors,including poor electrical conductivity of electrode materials,greatly volumetric variation,as well as the polysulfide formation upon the *** address these problems,it is imperative to develop and design effective and suitable sulfur host anode *** organic frameworks(MOFs)-based cathode materials,possessing their good conductivity and easy morphology design,have been extensively studied and exhibited enormously potential in *** this review,a comprehensive overview of MOFs-based sulfur host materials is provided,including their electrochemical reaction mechanisms,related evaluation parameters,and their performances used in LSBs in the past few *** particular,the recent advances using in-situ characterization technologies for investigating the electrochemical reaction mechanism in LSBs are presented and ***,the challenges and prospects associated with future research on MOF-related sulfur host materials are *** is anticipated to offer the guidance for the identification of suitable MOFs-based sulfur cathode materials for high-performance LSBs,thereby contributing for the achievement of a sustainable and renewable society.

关键词： lithium metal anode sulfur cathode metal organic frameworks host energy density in-situ characterization

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Combination of High Yield Strength and Improved Ductility of 21Cr Lean Duplex Stainless Steel by Tailoring Cold Deformation and Low-Temperature Short-Term Aging

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 695-702页

作者： Zhenghong Liu Zhigang Wu Ying Han Xiaolei Song guoqing Zu Weiwei Zhu Xu Ran Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun130012China School of Materials Science and Engineering Changchun University of TechnologyChangchun130012China Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit Changchun University of TechnologyChangchun130012China

Proper matching of cold-rolled deformation and low-temperature short-term aging can simultaneously enhance the strength and ductility of the lean duplex stainless steel. To investigate this, the microstructure evolution of cold-rolled and aging steels was observed by using scanning electron microscopy, transmission electron microscopy and electron backscattered diffraction. Additionally, the phase volume fraction was measured using X-ray diffraction. In this study, it was observed that the elongation of 21Cr lean duplex stainless steel significantly increased to 16.7% after undergoing moderate cold deformation (~ 40% reduction) and subsequent aging treatment at 550 ℃ for 30 min. Remarkably, the material still maintained a high yield strength of 1045 MPa. Such an excellent mechanical property was attributed to a unique microstructure combination of fine α'-martensite, twins, coarsened austenite resulting from partial martensite reverse transformation, and two-phase fine layered structure. The result of this study may open up new horizons for the alloy development in order to overcome the low ductility of cold-rolled high-strength lean duplex stainless steel.

关键词： Lean duplex stainless steel Cold rolling Aging Microstructure Mechanical properties Use our pre-submission checklist

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Manipulator tracking technology based on FSRUKF

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Journal of Systems Engineering and Electronics 2024年第2期35卷 473-484页

作者： SHI guoqing ZHANG Boyan ZHANG Jiandong YANG Qiming HUANG Xiaofeng QUE Jianyao PU Junwei GENG Xiutang School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Northwest Institute of Mechanical&Electrical Engineering Xianyang 712000China

Aiming at the shortcoming that the traditional industrial manipulator using off-line programming cannot change along with the change of external environment,the key technologies such as machine vision and manipulator control are studied,and a complete manipulator vision tracking system is ***,Denavit-Hartenberg(D-H)parameters method is used to construct the model of the manipulator and analyze the forward and inverse kinematics equations of the *** the same time,a binocular camera is used to obtain the threedimensional position of the ***,in order to make the manipulator track the target more accurately,the fuzzy adaptive square root unscented Kalman filter(FSRUKF)is proposed to estimate the target ***,the manipulator tracking system is built by using the position-based visual *** simulation experiments show that FSRUKF converges faster and with less error than the square root unscented Kalman filter(SRUKF),which meets the application requirements of the manipulator tracking system,and basically meets the application requirements of the manipulator tracking system in the practical experiments.

关键词： square root unscented Kalman filter(SRUKF) fuzzy inference manipulator visual servo

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Fabrication of amorphous FeCoNiCuMnP x high-entropy phosphide/carbon composites with a heterostructured fusiform morphology for efficient oxygen evolution reaction

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Journal of Materials Science & Technology 2024年第1期168卷 62-70页

作者： Yifan Zhou Longqing Gao Haoyuan Chen Hao Wang Juan Zhang Xiumin Li Fangfang Duo guoqing Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Graduate School of Sustainable Community Studies Hirosaki University1-BunkyochoHirosaki 036-8560Japan Graduate School of Science and Technology Hirosaki University3-BunkyochoHirosaki 036-8561Japan Xinxiang University School of Chemistry&Materials EngineeringXinxiang 453003China Energy Conversion Engineering Laboratory Institute of Regional InnovationHirosaki University3-BunkyochoHirosaki 036-8561Japan

Amorphous high-entropy materials with abundant defects,coordinatively unsaturated sites,and loosely bonded atoms could exhibit excellent electrocatalytic ***,how to fabricate such ma-terials with nanostructure as well as amorphous structure is still full of *** this work,high-entropy metal organic framework(HE-MOF)is employed as the self-sacrificial template to fabricate FeCoNiCuMnP x high-entropy phosphide/carbon(HEP/C)*** obtained composite shows a het-erostructured fusiform morphology,in which the HEP is encapsulated by a carbon layer,revealing high electron conductivity as well as rich catalytic active sites for oxygen evolution reaction(OER).Beside,it is found that there is a short-range ordered crystal structure in the amorphous phase,which is bene-ficial for revealing high OER catalytic activity as well as good *** a result,the optimum HEP/C composite shows an overpotential 239 mV@10 mA cm^(−2)with a small Tafel slope of 72.5 mV dec^(−1) for catalyzing OER in alkaline solution.

关键词： Water electrolysis Oxygen evolution reaction High-entropy MOFs High-entropy phosphides Amorphous structure

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