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A quantitative interpretation of the saturation exponent in Archie’s equations

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Petroleum Science 2021年第2期18卷 444-449页

作者： tong-Cheng han han Yan Li-Yun Fu School of Geosciences China University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Saturation exponent is an important parameter in Archie’s equations;however,there has been no well-accepted physical interpretation for the saturation *** have theoretically derived Archie’s equations from the Maxwell–Wagner theory on the assumption of homogeneous fluid distribution in the pore space of clay-free porous *** theoretical derivations showed that the saturation exponent is in essence the cementation exponent for the water–air mixture and is quantitatively and explicitly related to the aspect ratio of the air bubbles in the *** results have provided a theoretical backup for the empirically obtained Archie’s equations and have offered a more physical and quantitative understanding of the saturation exponent.

关键词： Electrical properties Saturation exponent Archie equation Maxwell-Wagner theory

Adaptive backtracking search optimization algorithm with pattern search for numerical optimization

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Journal of Systems Engineering and Electronics 2016年第2期27卷 395-406页

作者： Shu Wang Xinyu Da Mudong Li tong han Information and Navigation College Air Force Engineering University Aeronautics and Astronautics Engineering College Air Force Engineering University

The backtracking search optimization algorithm（BSA） is one of the most recently proposed population-based evolutionary algorithms for global optimization. Due to its memory ability and simple structure, BSA has powerful capability to find global optimal solutions. However, the algorithm is still insufficient in balancing the exploration and the exploitation. Therefore, an improved adaptive backtracking search optimization algorithm combined with modified Hooke-Jeeves pattern search is proposed for numerical global optimization. It has two main parts： the BSA is used for the exploration phase and the modified pattern search method completes the exploitation phase. In particular, a simple but effective strategy of adapting one of BSA＇s important control parameters is introduced. The proposed algorithm is compared with standard BSA, three state-of-the-art evolutionary algorithms and three superior algorithms in IEEE Congress on Evolutionary Computation 2014（IEEE CEC2014） over six widely-used benchmarks and 22 real-parameter single objective numerical optimization benchmarks in IEEE CEC2014. The results of experiment and statistical analysis demonstrate the effectiveness and efficiency of the proposed algorithm.

关键词： evolutionary algorithm backtracking search optimization algorithm(BSA) Hooke-Jeeves pattern search parameter adaption numerical optimization

Laboratory insights into the effects of methane hydrate on the anisotropic joint elastic-electrical properties in fractured sandstones

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Petroleum Science 2023年第2期20卷 803-814页

作者： Sheng-Biao Liu tong-Cheng han Li-Yun Fu Shandong Provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)QingdaoShandong266580China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdaoShandong266071China

Fractured hydrate-bearing reservoirs show significantly anisotropic geophysical properties. The joint application of seismic and electromagnetic explorations is expected to accurately assess hydrate resources in the fractured reservoirs. However, the anisotropic joint elastic-electrical properties in such reservoirs that are the key to the successful application of the joint explorations, remain poorly understood. To obtain such knowledge, we designed and implemented dedicated laboratory experiments to study the anisotropic joint elastic-electrical properties in fractured artificial silica sandstones (with fracture density of about 6.2%, porosity of approximately 25.7%, and mean grainsize of 0.089 mm) with evolving methane hydrate. The experimental results showed that the anisotropic compressional wave velocities respectively increased and decreased with the forming and dissociating hydrate, and the variation in the increasing trend and the decreasing extent of the velocity perpendicular to the fractures were more significant than that parallel to the fractures, respectively. The experimental results also showed that the overall decreasing trend of the electrical conductivity parallel to the fractures was steeper than that perpendicular to the fractures during hydrate formation, and the general variations of the two conductivities with complex trend were similar during hydrate dissociation. The variations in the elastic and electrical anisotropic parameters with forming and dissociating hydrate were also found to be distinct. Interpretation of the experimental results suggested that the hydrate binding to the grains evolved to bridge the surfaces of fractures when saturation exceeded 10% during hydrate formation, and the bridging hydrate gradually evolved to floating in fractures during dissociation. The experimental results further showed that the anisotropic velocities and electrical conductivities were correlated with approximately consistent trends of different

关键词： Fractured hydrate reservoirs Elastic anisotropy Electrical anisotropy Joint elastic-electrical properties Hydrate distribution

Influence of Trace Alloying Elements on Corrosive Resistance of Cast Stainless Steel

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Journal of Iron and Steel Research International 2005年第5期12卷 52-57页

作者： DUAN han-qiao YAN Xiang WEI Bo-kang LIN han-tong Huazhong University of Science and Technology Wuhan 430074 China

The influences of trace alloying elements niobium, vanadium and zirconium on the corrosive resistance of 18 8 type cast stainless steel have been studied in detail by orthogonal design experiments. The results show that zirconium is mainly in the form of compound inclusions, which is unfavorable to promote the corrosive resistance of the cast stainless steel. It can alleviate the disadvantageous influence of carbon addition on corrosive resistance when some elements such as vanadium and niobium exist in the steel, and niobium has a remarkable influence on the intergranular corrosive resistance but unobvious on the pitting corrosion, and vanadium has a slightly favorable influence on the corrosive resistance of the steel.

关键词： orthogonal design stainless steel trace alloying element corrosive resistance

不同荷载作用下五边形石墨烯的变形破坏机理研究

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原子与分子物理学报 2025年第6期42卷 51-57页

作者：赵泽若韩同伟李仁葛峻铭王嘉越江苏大学土木工程与力学学院镇江212013

五边形石墨烯是一种完全由碳五元环组成的准二维的亚稳态碳结构,在不同载荷作用下其变形破坏机理仍需进一步研究.本文基于ReaxFF反应力场采用分子动力学方法模拟研究了五边形石墨烯的拉伸、剪切和纳米压痕破坏过程,得到了五边形石墨烯... 详细信息

五边形石墨烯是一种完全由碳五元环组成的准二维的亚稳态碳结构,在不同载荷作用下其变形破坏机理仍需进一步研究.本文基于ReaxFF反应力场采用分子动力学方法模拟研究了五边形石墨烯的拉伸、剪切和纳米压痕破坏过程,得到了五边形石墨烯的拉伸和剪切应力-应变曲线以及压入载荷-位移曲线,系统分析了五边形石墨烯的变形破坏机理,并验证了五边形石墨烯在不同载荷作用下是否表现出塑性变形特征的一致性问题.研究结果表明,通过拉伸或纳米压入等不同加载方式均可准确测出五边形石墨烯的本征力学性能参数,其杨氏模量265.4~285.1 N/m,与第一性原理计算结果一致.研究还发现,五边形石墨烯在拉伸、剪切和纳米压痕过程中均会出现不可逆的塑性变形特征,而引起塑性变形的原因是由于不可逆的碳五元环向碳多元环结构的转变.以上研究结果可为基于五边形石墨烯的微/纳米机电系统的实际应用提供重要指导.

关键词：五边形石墨烯变形破坏机理分子动力学

A Chaos Sparrow Search Algorithm with Logarithmic Spiral and Adaptive Step for Engineering Problems

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Computer Modeling in Engineering & Sciences 2022年第1期130卷 331-364页

作者： Andi Tang Huan Zhou tong han Lei Xie Aeronautics Engineering College Air Force Engineering UniversityXi’an710038China

The sparrow search algorithm(SSA)is a newly proposed meta-heuristic optimization algorithm based on the sparrowforaging *** to other meta-heuristic algorithms,SSA has problems such as slowconvergence speed and difficulty in jumping out of the local *** order to overcome these shortcomings,a chaotic sparrow search algorithm based on logarithmic spiral strategy and adaptive step strategy(CLSSA)is proposed in this ***,in order to balance the exploration and exploitation ability of the algorithm,chaotic mapping is introduced to adjust the main parameters of ***,in order to improve the diversity of the population and enhance the search of the surrounding space,the logarithmic spiral strategy is introduced to improve the sparrow search ***,the adaptive step strategy is introduced to better control the process of algorithm exploitation and *** best chaotic map is determined by different test functions,and the CLSSA with the best chaotic map is applied to solve 23 benchmark functions and 3 classical engineering *** simulation results show that the iterative map is the best chaotic map,and CLSSA is efficient and useful for engineering problems,which is better than all comparison algorithms.

关键词： Sparrow search algorithm global optimization adaptive step benchmark function chaos map

Insights into the multiple applications of modified polyacrylamide as oilfield corrosion inhibitor and water phase tackifier

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Petroleum Science 2022年第1期19卷 397-408页

作者： tong han Ji-Xiang Guo Qing Zhao Tao Shen Shi-Ling Zhang Unconventional Natural Gas Institute China University of PetroleumChangpingBeijing102249People's Republic of China State Key Laboratory of Heavy Oil Processing and College of Science China University of PetroleumChangpingBeijing102249People's Republic of China

In order to obtain a multifunctional oilfield agent with both corrosion inhibition and oil displacement functions,a polymer with benzene ring structures is synthesized based on polyacrylamide(PAM)and used as inhibitor for the first *** including electrochemistry,weight loss and theoretical calculations are used to study the inhibition effect for P110 steel in 1.0 M *** experimental results show that the modified polymer poly-(Z)-N-benzylidenepropionamide(PBAM)has excellent inhibition effects,and the maximum efficiency can reach 90.62%in impedance spectroscopy *** benzene ring structure added in the modified polymer providesπelectrons for the adsorption of inhibitor on metal surface,strengthens the adsorption,and thus brings a better corrosion inhibition *** addition to the corrosion inhibition performance,the viscosity-increasing effect of PBAM is *** results show that the addition of benzene ring not only enhances the corrosion inhibition effect,but also brings temperature resistance to the ***,the salt tolerance of the polymer is affected,the synthesized PBAM which viscosity can above 500 m Pa s at 140℃ is suitable for high temperature and low salinity *** modified polyacrylamide has satisfactory corrosion inhibition and oil displacement performance,which provides a new idea for the development of oilfield chemistry.

关键词： Corrosion inhibitor Polymer Multifunctional pharmacy Computational study

The transcription factor ZmNAC84 increases maize salt tolerance by regulating ZmCAT1 expression

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The Crop Journal 2024年第5期12卷 1344-1356页

作者： Yitian Pan tong han Yang Xiang Caifen Wang Aying Zhang College of Life Sciences Nanjing Agricultural UniversityNanjing 210095JiangsuChina State Key Laboratory of Crop Genetics&Germplasm Enhancement and Utilization Nanjing Agricultural UniversityNanjing 210095JiangsuChina Sanya Institute of Nanjing Agricultural University Nanjing Agricultural UniversitySanya 572025HainanChina Institute of Crop Research Ningxia Academy of Agricultural and Forestry SciencesYinchuan 750002NingxiaChina

Salt stress severely affects plant growth and *** transcription factor NAC plays a variety of important roles in plant abiotic stress,but we know relatively little about the specific molecular mechanisms of NAC in antioxidant ***,our genetic studies reveal the positive regulation of salt tolerance in maize by the transcription factor *** salt stress,overexpression of ZmNAC84 in maize increased the expression of ZmCAT1,enhanced CAT activity,and consequently reduced H_(2)O_(2) accumulation,thereby improving salt stress tolerance in *** RNA interference-mediated knockdown of ZmNAC84 produced the opposite ***,we found that ZmNAC84 directly binds to and regulates the expression of the ZmCAT1 promoter,and the hybridized material also demonstrated that ZmCAT1 is a downstream target gene of *** addition,phenotypic and biochemical analyses indicated that ZmCAT1 positively regulated salt tolerance by regulating H_(2)O_(2) accumulation under salt *** together,these results reveal the function of ZmNAC84 in regulating ZmCAT1-mediated antioxidant defense in response to salt stress in plants.

关键词： Maize ZmNAC84 ZmCAT1 Salt stress

Clinical characteristics and treatment of splenic infarction in children with systemic lupus erythematosus

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World Journal of Pediatrics 2024年第5期20卷 525-531页

作者： Yan Li Yu-Rong Piao tong-Xin han Hua-Wei Mao Department of Immunology Ministry of Education Key Laboratory of Major Diseases in ChildrenBeijing Key Laboratory for Genetics of Birth DefectsNational Center for Children’s HealthBeijing Children’s HospitalCapital Medical UniversityNo.56 Nan Li Shi LuBeijing100045China

Splenic infarction(SI)is a rare clinical phenomenon that occurs when the blood supply to the spleen is interrupted,resulting in tissue ischemia and necrosis[1].There are many causes of SI;in adult patients,cardioembolism,hematological malignancy,and infectious disease are the most common[2].Rheumatic diseases,especially systemic lupus erythematosus(SLE)and granulomatosis with polyangitis,can also lead to SI[3];however,only a few cases have been *** are currently no statistically meaningful data on the etiology of SI in *** most patients with SI can recover after conservative treatment,a small number of patients develop complications,such as splenic abscess,splenic rupture,splenic hemorrhage,and hemoperitoneum,and may even undergo splenectomy in severe cases.

关键词： erythematosus lupus treatment