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Simulation of Supercritical Carbon Dioxide Fracturing in Shale Gas Reservoir

Journal of Thermal Science 2021年第4期30卷 1444-1451页

作者： SONG Weiqiang NI hongjian TANG Peng ZHANG Shichuan GAO Jichao ZHANGJunming SheN Baotang 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 TechnologyQingdao 266590China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266580China Safety Environmental Protection and Engineering Supervision CenterPetro China Tarim Oilfield CompanyKorla 841000China Research Institute of Oilfield Production China Oilfield Services LimitedTianjin 300451China

In order to fracture shale gas reservoir with carbon dioxide as the working fluid,laboratory experiments were firstly conducted to measure the influence of carbon dioxide immersion on shale rock's properties,and then the coupling mechanism between stress and seepage during hydraulic fracturing was simulated based on cohesive zone *** fracturing ability of carbon dioxide and water was also compared under the same working conditions,and finally sensitivity analysis(including elastic modulus of shale,filtration coefficient,pump rate and viscosity of carbon dioxide)were conducted based on field *** results show that,the elastic modulus of shale increased by 32.2%,the Poisson's ratio decreased by 40.3%and the compressive strength decreases by 22.9%after geothermal reaction with carbon dioxide under 30 MPa and 335.15 K for 2 *** with water fracturing,carbon dioxide fracturing induces longer fracture(increased by 25.3%)and narrower fracture(decreased to 40.8%).The fracture tends to get longer and narrower with increasing elastic modulus of *** filtration coefficient increases,the maximum width of fracture decreases significantly,whereas the length changes *** the length and maximum width of fracture increase with increasing pump rate,however the changing rate of length tends to *** influence of viscosity of carbon dioxide on both fracture width and length is negligible,which validates the stable feasibility of carbon dioxide fracturing in different formation conditions.

关键词： supercritical carbon dioxide fracturing shale gas mechanical properties simulation

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Coupling action of rainfall and vehicle loads impact on the stability of loess slopes based on the iso-water content layer

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Earthquake Research Advances 2022年第3期2卷 67-76页

作者： Yu Zhang hongjian Jiang Gexue Bai Bingbing Han School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhou730070China Gansu Institute of Engineering Geology Lanzhou730000China

To clarify the changes in slope stability of loess slopes under the coupling action of rainfall and vehicle *** with different water contents under different environmental conditions were carried out indoors,and the relationship function between water content and shear strength parameters was obtained;based on Geostudio,an equivalent layered calculation model of water content-strength parameters of loess slope was established,the variation law of soil sample matrix suction with volumetric water content was measured by volumetric pressure plate ***,by using a combination of finite element analysis of saturated/unsatu-rated seepage and limit equilibrium analysis of slope stability,the SLOPE/W module in the modeling software GeoStudio is used to calculate and analyze the effects of vehicle loads,rainfall intensity,rainfall duration,and other working conditions on the stability of loess slopes,*** results show that when the lane is in the middle of the slope,the vehicle load parameters have little effect on the uphill stability,but have a greater impact on the downhill;With the increase in rainfall,the change curves of the slope safety coefficient gradually overlap when the vehicle loads are four-axis,five-axis,and *** shows that when studying the change of slope safety factor under the dual influence of vehicle loads and rainfall,rainfall is the main cause of slope stability;The change rate of slope safety factor increases gradually with the increase of rainfall,and the change trends of the upper,lower and overall parts of the slope are similar.

关键词： Loess Coupling action Slope stability Iso-water content layer

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叶片失谐对叶盘结构振动特性的影响

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西北工业大学学报 2009年第5期27卷 645-650页

作者：王红建贺尔铭西北工业大学航空学院陕西西安710072

叶片失谐在实际叶盘结构中是不可避免的,并严重影响叶盘的振动特性。文章将失谐叶盘的模态及受迫振动响应投影到谐调叶盘模态空间,并提出一种节径谱的研究方法,通过关于不同节径的谐调模态的组合来描述失谐叶盘模态和受迫响应。基于叶... 详细信息

叶片失谐在实际叶盘结构中是不可避免的,并严重影响叶盘的振动特性。文章将失谐叶盘的模态及受迫振动响应投影到谐调叶盘模态空间,并提出一种节径谱的研究方法,通过关于不同节径的谐调模态的组合来描述失谐叶盘模态和受迫响应。基于叶盘集中参数模型,分析了叶片刚度失谐对叶盘频率转向区内外的模态振型及受迫响应等特性的影响规律。研究表明,节径谱的研究方法能够较为准确地捕捉失谐对叶盘结构振动特性的影响作用,对建立失谐与谐调叶盘结构振动特性之间的内在联系具有重要意义。

关键词：叶盘节径频率转向叶片失谐模态振型受迫振动

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Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites

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Nano Research 2021年第12期14卷 4878-4884页

作者： Yingsheng Xu Shuhong Xiang hengjian Mao hongjian Zhou Guozhong Wang Haimin Zhang Huijun Zhao Department of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Key Laboratory of Materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei230031China Centre for Clean Environment and Energy Griffith UniversityGold Coast CampusQLD4222AustraliaSouthport

Manganese tetravalent oxide(MnO_(2)),a superstar Faradic electrode material,has been investigated extensively for capacitive desalination,enabling higher salt adsorption capacity compared to the great majority of carbonous ***,few works paid attention on the relationship between the valences of manganese oxide and their desalination *** the first time,we prepared the spindle-like manganese oxides/carbon composites with divalent(MnO@C),trivalent(Mn_(2)O_(3)@C)and divalent/trivalent(Mn_(3)O_(4)@C)manganese by pyrolysis of manganese carbonate precursor under different condition,*** electrochemical behavior in three-electrode system and electrosorption performance obtained in hybrid membrane capacitive deionization(HMCDI)cells assembled with capacitive carbon electrodes were systematically evaluated,*** salt adsorption capacity(as large as 31.3,22.2,and 18.9 mg·g^(−1))and corresponding average salt adsorption rates(0.83,0.53,and 1.71 mg·g^(−1)min−1)were achieved in 500 mg·L^(−1) NaCl solution for MnO@C,Mn_(2)O_(3)@C,and Mn_(3)O_(4)@C,*** fifteen electrosorption-desorption cycles,ex-situ water contact angle and morphology comparison analysis demonstrated the superior cycling durability of the manganese oxide electrodes and subtle difference between their surface ***,density functional theory(DFT)was also conducted to elaborate the disparity among the valence states of manganese(+2,+3 and +2/+3)for in-depth *** work introduced manganese oxide with various valences to blaze new trails for developing novel Faradic electrode materials with high-efficiency desalination performance by valence engineering.

关键词： capacitive deionization manganese oxides Faradic electrode desalination valence engineering

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Detection of Interpolation Using Correlation Coefficients

Detection of Interpolation Using Correlation Coefficients

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2012 IEEE 11th International Conference on Signal Processing(ICSP 2012)

作者： hongjian Cao Yao Zhao Rongrong Ni Institute of information science Beijing Jiaotong University

ISBN: (纸本)9781467321969

Resampling detection is a very useful tool in digital image forensic. In this paper, we propose a new algorithm for detecting interpolation by using the periodicity characteristics hidden among the rows（or columns） of the image. The core of our algorithm is the use of correlation coefficients based on the observation that the correlation coefficients of the row（or column） vectors vary periodically in resampled image. In some images, the image contents themselves correlate periodically. To reduce this kind of interference and enhance the detection efficiency, we use the first derivatives signals and detect the image both horizontally and vertically under some condition. As experiments show, the proposed algorithm works well, and most of the resampling factors can be correctly determined with high accuracy.

关键词： correlation methods image sampling interpolation

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Macroscopic polarization enhancement boosting piezo-photocatalytic performance via Nb-doping on B-site of Bi_(4)Ti_(3)O_(12)nanosheets

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Journal of Advanced Ceramics 2024年第4期13卷 437-446页

作者： hongjian Yu Xindong Wei Min Wang Yan Zhang Zheng Wu Fan Guo Jie Han School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Material Sciences and TechnologyChina University of Geosciences(Beijing)Beijing 100083China School of Environmental and Chemical Engineering Xi’an Key Laboratory of Textile Chemical Engineering AuxiliariesXi'an Polytechnic UniversityXi'an 710048China

The development of a high-performance ferroelectric piezo-photocatalyst is an efficient strategy for advancing sustainability within the environmental and energy ***,a major challenge lies in the creation of a strong polarized electric field that can effectively hinder charge recombination,both within the bulk and on the surface of ***,we synthesize a series of Nb-doped Bi_(4)Ti_(3)O_(12)nanosheets via a facile one-pot hydrothermal method to achieve synergistically enhanced piezo-photocatalytic performance in CO_(2)reduction and pollutant *** optimized doped Bi_(4)Ti_(3)O_(12)demonstrates remarkable efficiency in the conversion of CO_(2)into CO,with a high production rate of 72.7μmol∙g−1∙h−1 without using co-catalysts or any sacrificial agent,surpassing the performance of unmodified Bi_(4)Ti_(3)O_(12)by up to 4.69 ***,our catalyst demonstrates ultra-fast piezo-photocatalytic degradation of organic pollutant Rhodamine B(RhB)at low concentrations and exceptional piezo-photocatalytic activity at high concentrations,outperforming most previously reported state-of-the-art *** systematic corroboration of catalyst characterization and experimental analysis reveals that the synergistic effect arises from the amplified macroscopic polarization induced by lattice distortion caused by the larger Nb ions,thereby improving piezo-photocatalytic *** research thus offers valuable insights into the direct design and fabrication of versatile catalytic systems,with applications spanning CO_(2)valorization and beyond.

关键词： CO_(2)reduction dye degradation piezo-photocatalysis Nb-doped Bi_(4)Ti_(3)O_(12) macroscopic polarization regulation

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Ultrasound monitoring of temperature and coagulation change during tumor treatment with microwave ablation

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Frontiers in Biology 2009年第3期4卷 254-259页

作者： Chunlan YANG Shuicai WU Yanping BAI hongjian GAO College of Life Science&Bioengineering Beijing University of TechnologyBeijing 100124China

Microwave ablation therapy has become an important method for tumor treatment in recent *** temperature and the coagulation region need real-time noninvasive monitoring to ensure the safety and effectiveness during the *** authors reviewed the ultrasonic monitoring methods for tumor microwave ablation therapy both at home and *** addition,the authors also prospected this technique in the future.

关键词： microwave ablation temperature coagulation ultrasound monitor

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Underwater Target Bearing Only Tracking Based on First Order Divided Difference Filter

Underwater Target Bearing Only Tracking Based on First Order...

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第25届中国控制与决策会议

作者： Xu Jinlong Wang hongjian Zhang Aihua College of Automation Harbin Engineering University

ISBN: (纸本)9781467355339

The passive sonar based target tracking is of great importance in practical applications. In underwater bearings only target tracking research, the traditional extended kalman filtering method uses Tarlor expansion to achieve the system nonlinear terms linearization, and it leads to a complicated computing time and singularity problems. This paper presents a method based on the First Order Divided Differential Filter （DDF1） algorithm for solving the problem. The DDF1 is derived based on polynomial approximations obtained with multidimensional Stirling interpolation formula, the implementation is significantly simpler because of no derivatives is required. The results of simulation and consistency test showed that the proposed algorithm has high tracking precision and tracking performance compared with the traditional EKF method under the same simulation conditions.

关键词： Underwater target Bearing only tracking First order divided difference filter (DDF1) Extended kalman filter (EKF) and Consistency testing

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A comparative study of two porous sponge scaffolds prepared by collagen derived from porcine skin and fish scales as burn wound dressings in a rabbit model

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Regenerative Biomaterials 2020年第1期7卷 63-70页

作者： Yufei Shi hongjian Zhang Xin Zhang Zhan Chen Dan Zhao Jun Ma Advanced Biomaterials and Tissue Engineering Center Huazhong University of Science and TechnologyWuhan 430074China Department of Biomedical Engineering College of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Collagen is widely used in biomedical applications due to its outstanding *** this study,highly porous sponge scaffolds were developed by using porcine skin-derived collagen(PSC)and fish scale-derived collagen(FSC),*** morphology and composition of these PSC and FSC scaffolds were *** water uptake ratio of FSC scaffolds reached 47.8,which is 1.7 times of PSC *** water vapour transmission rates(WVTR)of PSC and FSC scaffolds were 952.6655.5 and 1090.9677.1 g/m2/day,which could produce a moist healing environment for *** scaffolds show non-toxicity to L929 fibroblast *** burn wound healing efficiency of these two scaffolds was examined in vivo using *** scars around the wounds were observed after applying PSC and SFC *** studies reveal that the wound treated with PSC and FSC scaffolds showed much better wound recovery than gauze and vaseline gauze *** was suggested that FSC scaffolds have great potential as same as PSC to be used as burn wound dressing materials.

关键词： collagen wound dressings wound healing

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Research progress of anti-plant virus agents based on marine natural products

Advanced Agrochem

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Advanced Agrochem 2023年第1期2卷 31-38页

作者： hongjian Song Yuxiu Liu Qingmin Wang State Key Laboratory of Elemento-Organic Chemistry College of ChemistryFrontiers Science Center for New Organic MatterNankai UniversityTianjin300071China

Plant virus diseases are a serious threat to food crops,vegetables,and cash crops,their prevention and control are extremely difficult,known as‘plant cancer’,and effective prevention and control agents are extremely *** friendly natural antiviral active substances are key resources for the development of anti-plant virus *** natural products are the most active field of new drugs and lead compounds ***,there are few studies on their pesticide activities,especially their anti-plant virus *** the present manuscript,the latest research on anti-plant virus activity,structure-activity relationship,and mode of action of marine natural products were *** is hoped that this review will provide a useful reference for the research of anti-plant virus drugs.

关键词： Marine natural products Anti-plant virus agents Derivatives Mode of action

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