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Fractures interaction and propagation mechanism of multi-cluster fracturing on laminated shale oil reservoir

Petroleum Science 2024年第4期21卷 2600-2613页

作者： Jia-Xin lv Bing Hou Department of Petroleum Engineering China University of Petroleum(Beijing)at KaramayKaramay834000XinjiangChina Key Laboratory of Petroleum Engineering Ministry of EducationChina University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

The continental shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin contain thin lamina,which is characterized by strong plasticity and developed longitudinal shell limestone *** improve the production efficiency of reservoirs by multi-cluster fracturing,it is necessary to consider the unbalanced propagation of hydraulic fractures and the penetration effect of *** paper constructed a numerical model of multi-fracture propagation and penetration based on the finite element coupling cohesive zone method;considering the construction cluster spacing,pump rate,lamina strength and other parameters studied the influencing factors of multi-cluster fracture interaction propagation;combined with AE energy data and fracture mode reconstruction method,quantitatively characterized the comprehensive impact of the strength of thin interlayer rock interfaces on the initiation and propagation of fractures that penetrate layers,and accurately predicted the propagation pattern of hydraulic fractures through laminated shale oil *** results revealed that in the process of multi-cluster fracturing,the proportion of shear damage is low,and mainly occurs in bedding fractures activated by outer *** the cluster spacing enhances the fracture system's penetration ability,though it lowers the activation efficiency of *** high plasticity of the limestone interlayer may impact the vertical propagation distance of the main *** the interface strength is beneficial to the reconstruction of the fracture height,but the interface communication effect is *** selection of layers with moderate lamina strength for fracturing stimulation,increasing the pump rate during fracturing and setting the cluster spacing reasonably are beneficial to improve the effect of reservoir stimulation.

关键词： Laminated shale Multi-cluster fracturing Cross-layer Cohesive zone model Acoustic emission technique

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One-pot molten salt method for constructing CdS/C_(3)N_(4) nanojunctions with highly enhanced photocatalytic performance for hydrogen evolution reaction

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Journal of Environmental Sciences 2022年第2期34卷 244-257页

作者： Weijia Zhao Hongyun Niu Yongliang Yang Hongzhou lv Jungang lv Yaqi Cai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Institute of Environment and Health Jianghan UniversityWuhan 430056China Procuratoral Technology and Information Research Center Supreme People's ProcuratorateBeijing 100726China Institute of Environment and Health Hangzhou Institute for Advanced StudyUniversity of Chinese Academic SciencesHangzhou 310024China

The construction of heterojunction photocatalysts for efficiently utilizing solar energy has attracted considerable attention to solve the energy crisis and reduce environmental *** this study,we use the energy released from an easily-occurred exothermic chemical reaction to serve as the drive force to trigger the formation of Cd S and C_(3)N_(4) nanocomposites which are successfully fabricated with cadmium nitrate and thiourea without addition of any solvents and protection of inert gas at initial temperature,a little higher than the melting point of *** as-prepared Cd S/C_(3)N_(4) materials exhibit high efficiency for photocatalytic hydrogen evolution reaction(HER)with the HER rate as high as 15,866μmol/(g·hr)under visible light irradiation(λ>420 nm),which is 89 and 9 times those of pristine C_(3)N_(4) and Cd S,***,the apparent quantum efficiency(AQE)of Cd S/C_(3)N_(4)–1:2–200–2(Cd S/C_(3)N_(4)–1:2–200–2 means the ratio of Cd to S is 1:2 and the reaction temperature is set at 200℃ for two hours)reaches 3.25%atλ=420±15 *** irradiated for more than 24 hr,the HER efficiencies of Cd S/C_(3)N_(4) do not exhibit any *** DFT calculation suggests that the charge difference causes an internal electric field from C_(3)N_(4) pointing to Cd S,which can more effectively promote the transfer of photogenerated electrons from Cd S to C_(3)N_(4).Therefore,most HER should occur on C_(3)N_(4) surface where photogenerated electrons accumulate,which largely protects Cd S from photo-corrosion.

关键词： One-pot molten salt method Cd S/C_(3)N_(4)nanojunctions Photocatalytic hydrogen evolution reaction Anti-photo-corrosion DFT calculation

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A Generalized MSST Algorithm for Counting Points of Elliptic Curves over F_(p)^(n)

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Journal of Systems Science & Complexity 2024年第4期37卷 1738-1754页

作者： LI Xiao lv Chang PAN Zhizhong Key Laboratory of Cyberspace Security Defense Institute of Information EngineeringChinese Academy of SciencesBeijing 100085China School of Cyber Security University of Chinese Academy of SciencesBeijing 100085China Huawei Technologies Co. Ltd.Shenzhen 518129China

Elliptic curve cryptography is an important part of nowaday's public key *** points of elliptic curves over finite fields is of great significance to the selection of safety *** present,there are many p-adic algorithms,such as SST algorithm,generalized AGM algorithm,Kedlaya algorithm,etc.,which can deal with the situation of finite fields of small *** this paper,the authors generalize the MSST algorithm of characteristic 2 to general fields of odd characteristic,and propose the generalized MSST *** generalized MSST algorithm is achieved by combining the advantages of the SST algorithm and the generalized AGM *** the time complexity of the multiplication of two n-bit numbers is denoted as O((n)^(μ)),then the time complexity of the generalized MSST algorithm is O(n^(2μ+1/1+μ)),which is the same as the improved SST *** practical experiments,the running time of the generalized MSST algorithm is less than that of the improved SST algorithm.

关键词： Elliptic curve generalized AGM algorithm generalized MSST algorithm SST algorithm

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Mathematical modeling of an armature assembly in pilot stage of a hydraulic servo valve based on distributed parameters

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Chinese Journal of Aeronautics 2021年第3期34卷 50-60页

作者： Xinbei lv Jinghui PENG Songjing LI Department of Fluid Control and Automation Harbin Institute of TechnologyHarbin 150001China

The dynamic performance of a nozzle-flapper servo valve can be affected by several factors such as the disturbance of the input signal,the motion of the armature assembly and the oscillation of the jet *** the part of vibrating at high frequency,the armature assembly plays a vital role during the operation of the servo *** order to accurately predict the transient response of the armature assembly during the vibration,a mathematical model of armature assembly is established based on the distributed parameters method(DPM)and Hamilton *** new mathematical model is composed of three main parts,the modal eigenfunction,modal mechanical response expressions of the spring tube and the motion equation of the other armature *** programing,the purpose of using the DPM to predict the dynamic response of different positions located on the armature assembly is *** verifying the validity of the mathematical model,the finite element method(FEM)and classic model(CM)of armature assembly are applicated by commercial software under the same *** comparison results prove that the DPM can effectively predict the axial and tangential deflection of the armature assembly different positions which the CM can’t duing to its over-simplification.A certain error is generated when predicting the axial deformation at different heights by DPM,which is caused by an approximate method to simulate the torsion of the spring *** comparison results of the spring tube deflection at different vibration frequencies shows that the adaptability of DPM is significantly higher than the classic model,which verify the model is more adaptable for predicting the dynamic response of the armature assembly.

关键词： Armature assembly Distributed parameters method Dynamics Mathematical models Servo valve

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Chronicle of Wu Zhengyi

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Plant Diversity 2016年第6期38卷 330-344页

作者： Chunchao lv Kunming Institute of Botany Chinese Academy of Sciences

1916-I was born in Jiujiang,Jiangxi province on June 12th of the lunar *** first name'Zhengyi'was given by my grandfather,while I later styled myself'Bai Jian^1'and used the pseudonym'Bai Jian^2'.With the ancestral home of the Wu family in She county,Anhui province,I lived in Yangzhou with a registered hometown in Yizheng,Jiangsu province.

关键词： Chronicle of Wu Zhengyi In

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Low-dimensional cobalt doped carbon composite towards wideband electromagnetic dissipation

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Nano Research 2023年第1期16卷 70-79页

作者： Xiaodi Zhou Biao Zhao Hualiang lv School of Microelectronics Fudan UniversityShanghai 200433China Willian G.Lowrie Department of Chemical and Biomolecular Engineering The Ohio State UniversityColumbusOH 43210USA

Composites composed of a carbon matrix decorated with a metal or metal oxide derived from zeolitic imidazolate frameworks(ZIFs)have been widely applied as suitable electromagnetic wave absorbers due to their high porosity and controllable ***,achieving ideal absorption performance remains a challenge owing to the inadequate conductivity and high density of the metal ***,a temperature-controlling treatment was employed for the bimetal ZIFs,and the corresponding derivatives exhibited an excellent dissipation ability with a minimum reflection loss value of−54.3 dB and an effective bandwidth of 7.0 GHz at a thickness of 2.4 mm,which resulted from the strong dipole polarization ***,after successfully controlling the Zn/Co ratio,the attenuation capability was greatly enhanced at a thickness of 1.4 mm,with bandwidths of 13.0–18.0 ***,this work provides an ameliorated strategy for microwave absorption performance of carbon-based materials.

关键词： microwave absorption bi-meta based absorber single-atom metal organic frameworks(MOFs)derived composite dielectric relaxation

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Bio-inspired micro/nanostructures for flexible and stretchable electronics

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Nano Research 2020年第5期13卷 1244-1252页

作者： Hongbian Li Suye lv Ying Fang CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Brain Science and Intelligence Technology Institute of NeuroscienceChinese Academy of SciencesShanghai 200031China

The remarkable ability of biological systems to sense and adapt to complex environmental conditions has inspired the design of next-generation electronics with advanced *** review focuses on emerging bio-inspired strategies for the development of flexible and stretchable electronics that can accommodate mechanical deformations and integrate seamlessly with biological *** will provide an overview of the practical considerations in the materials and structure designs of flexible and stretchable *** progress in bio-inspired pressure/strain sensors,stretchable electrodes,mesh electronics,and flexible energy devices are then discussed,with an emphasis on their unconventional micro/nanostructure designs and advanced ***,current challenges and future perspectives are identified and discussed.

关键词： bio-inspired structures mechanical sensors stretchable electrodes mesh electronics flexible energy devices

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Recent advances in platelet engineering for anti-cancer therapies

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Particuology 2022年第5期20卷 2-13页

作者： Yanlin lv Wei Wei Guanghui Ma State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Platelets contribute a major role in hemostasis by clumping and coagulation at the site of blood vessel *** light of recent findings of a close relationship between platelets and immunological response,as well as interactions between platelets and cancer cells,novel engineering strategies have emerged for the integration of platelets or platelet membrane(PM)with anti-cancer *** this review,we discuss several recent innovations that use platelets or their membranes to circumvent host immune responses and target tumor cells with high specificity to deliver a range of pharmacological,photothermal,or immunologic agents for eradication of recalcitrant tumor *** specifically,we compare the relative advantages of using whole platelets versus single or hybrid PM to coat nanoparticle *** cargoes range from well-established anti-tumor apoptosis-inducing agents,to relatively new photothermal agents that can induce a feedback cascade in which they induce vascular damage to the tumor which recruits more platelet-or membrane-encapsulated agents to induce further *** also discuss the use of engineered platelets to produce programmed cell death-inducing platelet derived *** review provides an overview and future directions for this promising platelet-based biomimetic approach to anti-cancer therapy.

关键词： Engineering platelets Platelet-mimicking Drug delivery Anti-cancer therapy

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基于文本挖掘的百年来中国共产党思想政治工作政策的演进与启示

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河北大学学报（哲学社会科学版） 2025年第1期50卷 87-98页

作者：任鹏吕宏伟东北大学马克思主义学院辽宁沈阳110169

思想政治工作政策不仅是党提高人们思想觉悟、加强意识形态建设的有力武器,更是党的思想政治工作思想贯彻落实的重要途径。在运用扎根理论分析思想政治工作政策文本的基础上建构分析模型,发现政策环境、政策目标、政策工具是影响思想政... 详细信息

思想政治工作政策不仅是党提高人们思想觉悟、加强意识形态建设的有力武器,更是党的思想政治工作思想贯彻落实的重要途径。在运用扎根理论分析思想政治工作政策文本的基础上建构分析模型,发现政策环境、政策目标、政策工具是影响思想政治工作政策实效的核心要素,并呈现出思想政治工作政策始终伴随着党的中心任务进行主题转换的演进规律。据此将百年来党的思想政治工作政策演进划分为奠基立业、赓续发展、鼎新革故、全面深化四个阶段加以分析。这启示我们,要始终坚持党的全面领导,在统筹谋划、高位推动中确保政策的正确方向;准确把握目标,在围绕中心、促进人的全面发展中不断提升政策合意性;坚持守正创新,在遵循行为逻辑、精准选用政策工具中提升落实质效;科学研判环境,在明确历史方位、掌握具体方法中实现政策目标。

关键词：中国共产党思想政治工作政策政策演进现实启示

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The Exponential Law Between Dwell Time and the Strength of PBX Substitute Material

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Acta Mechanica Solida Sinica 2021年第2期34卷 204-220页

作者： Yizhan Yang Hangjie lv Jiankang Chen The Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China

Polymer-bonded sugars(PBSs)can be used as a substitute material for polymerbonded explosives(PBXs)due to their ability to simulate the mechanical properties of *** the process of pressing a PBS,the length of the dwell time has a significant impact on the mechanical properties of the *** reinforcing effect is based on the residual pressure causing the binder to flow and gradually fill each *** the use of Darcy5s principle of binder infiltration and viscoelastic theory,an exponential relationship between the compressive strength of PBS and the dwell time has been *** the experiments,it was found that the extreme forces that correspond to the compaction stage of the PBS samples with different dwell times were almost the same;this indicates that there is tolerance to damage during the compaction *** existence of the compaction stage is related to the brittleness of the *** experimental results showed that as the dwell time increased,the rate of damage evolution of the specimen decreased.

关键词： Polymer-bonded sugars Darcy’s law Binder flowing and filling Compressive strength

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