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Numerical simulation of three-dimensional fracturing fracture propagation in radial wells

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Petroleum Exploration and Development 2023年第3期50卷 699-711页

作者： wang tianyu GUO Zhaoquan LI Gensheng MA Zhengchao YONG Yuning CHANG Xin TIAN Shouceng State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Beijing Petroleum Machinery Co. Ltd.China National Petroleum Corporation Engineering Technology Research InstituteBeijing 102206China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

A fracture propagation model of radial well fracturing is established based on the finite element-meshless *** model considers the coupling effect of fracturing fluid flow and rock matrix *** fracture geometries of radial well fracturing are simulated,the induction effect of radial well on the fracture is quantitatively characterized,and the influences of azimuth,horizontal principle stress difference,and reservoir matrix permeability on the fracture geometries are *** radial wells can induce the fractures to extend parallel to their axes when two radial wells in the same layer are *** the radial wells are symmetrically distributed along the direction of the minimum horizontal principle stress with the azimuth greater than 15,the extrusion effect reduces the fracture length of radial *** the radial wells are symmetrically distributed along the direction of the maximum horizontal principal stress,the extrusion increases the fracture length of the radial *** fracture geometries are controlled by the rectification of radial borehole,the extrusion between radial wells in the same layer,and the deflection of the maximum horizontal principal *** the radial wells are distributed along the minimum horizontal principal stress symmetrically,the fracture length induced by the radial well decreases with the increase of azimuth;in contrast,when the radial wells are distributed along the maximum horizontal principal stress symmetrically,the fracture length induced by the radial well first decreases and then increases with the increase of *** fracture length induced by the radial well decreases with the increase of horizontal principal stress *** increase of rock matrix permeability and pore pressure of the matrix around radial wells makes the inducing effect of the radial well on fractures increase.

关键词： radial well three-dimensional fracturing fracture propagation simulation finite element-meshless method fluid-solid coupling

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蓄热蓄冷一体化储能水箱的评价指标研究

煤气与热力 2024年第5期44卷 6-10页

作者：王凯润龚勋王海超王天雨董波伟李仲博王明策乔镖国家电投集团东北电力有限公司辽宁沈阳110623 大连理工大学建设工程学院辽宁大连116024 阿尔托大学科学学院芬兰艾斯堡11100 北京市热力集团有限责任公司北京100086 中国建筑科学研究院有限公司北京101119

阐述蓄热蓄冷一体化储能水箱的工作原理,分析设计特征数和评价指标。分析了弗劳德数Fr和雷诺数Re,并指出在布水器设计时应遵循Fr小于等于1的原则。提出了流速均匀性系数的概念,用于评价储能水箱水平截面的速度均匀性。分析了斜温层厚度... 详细信息

阐述蓄热蓄冷一体化储能水箱的工作原理,分析设计特征数和评价指标。分析了弗劳德数Fr和雷诺数Re,并指出在布水器设计时应遵循Fr小于等于1的原则。提出了流速均匀性系数的概念,用于评价储能水箱水平截面的速度均匀性。分析了斜温层厚度、半循环性能系数和火用效率,以定量分析储能水箱的分层效果和储能效率,为储能水箱的设计及优化运行提供评价依据。

关键词：蓄热蓄冷储能水箱评价指标

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3D dahlia-like NiAl-LDH/CdS heterosystem coordinating with 2D/2D interface for efficient and selective conversion of CO_(2)

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Chinese Chemical Letters 2022年第4期33卷 2111-2116页

作者： Xiaoyue Zhang Yong Yang Lijun Xiong tianyu wang Zheng Tang Panjie Li Nan Yin Aiwu Sun Jinyou Shen Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Soft Chemistry and Functional Materials Ministry of EducationSchool of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Faculty of Chemical Engineering Huaiyin Institute of TechnologyHuaiyin 223001China

Developing photocatalyst with high activity,superior stability and prominent selectivity for CO_(2)conversion is of great importance for the target of carbon ***,3 D dahlia-like NiAl-LDH/CdS heterosystem is developed through in-situ decoration of exfoliated CdS nanosheets on the scaffold of NiAl-LDH and the on-spot *** formation of a hierarchical architecture collaborating with well-defined 2 D/2 D interfacial interaction is constructed by optimizing the ratio of CdS integrated in the formation of the *** light-harvesting capacity of NiAl-LDH/CdS is improved by this unique scaffold,and the charge transfer between NiAl-LDH and CdS is effectively facilitated by virtue of the unique 2 D/2 D *** a result,the 3 D hierarchical NiAl-LDH/CdS heterosystem presents 12.45μmol g^(-1)h^(-1)of CO production(3.3 and 1.6 folds of pristine NiAl-LDH and CdS) with 96% selectivity and superior *** 3 D hierarchical design collaborating with 2 D/2 D interfacial interaction provides a new avenue to develop ideal catalysts for artificial photosynthesis.

关键词： Photocatalysis CdS Photocorrosion NiAl-LDH CO_(2)Conversion

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激光表面改性钛合金的摩擦磨损性能研究

精密成形工程 2024年第1期16卷 52-58页

作者：王天宇孙红飞李九霄杨冬野武文海原子玟赵海张卓上海工程技术大学材料科学与工程学院上海201620

目的研究皮秒激光表面处理对Ti-13Nb-13Zrβ钛合金表面形貌以及硬度和摩擦磨损性能的影响规律。方法采用皮秒激光对β钛合金进行表面改性,利用扫描电镜观察皮秒激光加工后样品的表面形貌,并对基体和皮秒激光加工后的样品进行摩擦磨损对... 详细信息

目的研究皮秒激光表面处理对Ti-13Nb-13Zrβ钛合金表面形貌以及硬度和摩擦磨损性能的影响规律。方法采用皮秒激光对β钛合金进行表面改性,利用扫描电镜观察皮秒激光加工后样品的表面形貌,并对基体和皮秒激光加工后的样品进行摩擦磨损对比试验。结果当皮秒激光扫描速度为50mm/s、激光功率分别为0.5W和5W时,在β钛合金表面生成了周期为500nm和830nm的纳米条纹结构,β钛合金基体的平均摩擦因数为0.70,经皮秒激光加工后样品的平均摩擦因数为0.26,比β钛合金基体的下降了62.8%。β钛合金基体的摩擦磨损失重为0.0032g,磨损率为1.01×10^(-6),皮秒激光加工后样品的摩擦磨损失重为0.0013g,磨损率为4.10×10^(-7)。结论在β钛合金皮秒激光表面改性过程中,当激光能量相同时,低扫描速度使激光热量可以长时间聚集和扩散,当扫描速度相同时,高激光能量对材料表面烧蚀的程度较大。在样品表面制备出了周期性纳米条纹结构,与基材相比,周期性纳米条纹结构与摩擦球的接触面积明显减小,同时犁沟效应有所降低,样品表面摩擦磨损性能显著提升,表明激光诱导周期性纳米条纹结构在改善材料摩擦学性能领域有极大的应用潜力。

关键词：皮秒激光 β钛合金表面改性表面纳米结构摩擦磨损性能

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SoftSSD:enabling rapid flash firmware prototyping for solid-state drives

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Frontiers of Information Technology & Electronic Engineering 2023年第5期24卷 659-674页

作者： Jin XUE Renhai CHEN tianyu wang Zili SHAO Department of Computer Science and Engineering The Chinese University of Hong KongHong Kong 999077China College of Intelligence and Computing Tianjin UniversityTianjin 300354China

Recently,solid-state drives(SSDs)have been used in a wide range of emerging data processing ***,an SSD is a complex embedded system that involves both hardware and software *** the latter,firmware modules such as the flash translation layer(FTL)orchestrate internal operations and flash management,and are crucial to the overall input/output performance of an *** the rapid development of new SSD features in the market,the research of flash firmware has been mostly based on simulations due to the lack of a realistic and extensible SSD development *** this paper,we propose SoftSSD,a software-oriented SSD development platform for rapid flash firmware *** core of SoftSSD is a novel framework with an event-driven programming *** the programming model,new FTL algorithms can be implemented and integrated into a full-featured flash firmware in a straightforward *** resulting flash firmware can be deployed and evaluated on a hardware development board,which can be connected to a host system via peripheral component interconnect express and serve as a normal non-volatile memory express *** from existing hardware-oriented development platforms,SoftSSD implements the majority of SSD components(e.g.,host interface controller)in software,so that data flows and internal states that were once confined in the hardware can now be examined with a software debugger,providing the observability and extensibility that are critical to the rapid prototyping and research of flash *** describe the programming model and hardware design of *** also perform experiments with real application workloads on a prototype board to demonstrate the performance and usefulness of SoftSSD,and release the open-source code of SoftSSD for public access.

关键词： Solid-state drives Storage system Software hardware co-design

Understanding the deterrence effect of punishment for marine information security policies non-compliance

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Journal of Ocean Engineering and Science 2024年第1期9卷 9-12页

作者： Xiaolong wang Changlin wang tianyu Yi Wenli Li School of Economics and Management Binzhou UniversityBinzhou256600China School of Business Macao University of Science and TechnologyMacao999078China School of Economics and Management Dalian University of TechnologyDalian116024China

In the organizational setting of marine engineering,a significant number of information security incidents have been arised from the employees’failure to comply with the information security policies(ISPs).This may be treated as a principal-agent problem with moral hazard between the employer and the employee for the practical compliance effort of an employee is not observable without high cost-.On the other hand,according to the deterrence theory,the employer and the employee are inherently self-interested *** is worth examining to what extent the employee is self-interested in the marine ISPs compliance ***,it is important to clarify the proper degree of severity of punishment in terms of the deterrent *** this study,a marine ISPs compliance game model has been proposed to evaluate the deterrence effect of punishment on the non-compliance behavior of employee *** is found that in a non-punishment contract,the employee will decline to comply with the marine ISPs;but in a punishment contract,appropriate punishment will lead her to select the marine ISPs compliance effort level expected by the employer,and cause no potential backfire effect.

关键词： Deterrence mechanism Marine engineering Information security policies Non-compliance behavior Principal-agent model with moral hazard Punishment

Effects of biodegradable mulching films on soil hydrothermal conditions and yield of drip-irrigated cotton(Gossypium hirsutum L.)

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 153-164页

作者： Dongwang wang Zhenhua wang Hongwei Ding Bo Zhou Jinzhu Zhang Wenhao Li Haiqiang Li Yam P.Dhital tianyu wang Rui Zong College of Water Conservancy&Architectural Engineering Shihezi UniversityShihezi 832000XinjiangChina Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production&Construction Group Shihezi 832000XinjiangChina Key Laboratory of Northwest Oasis Water-Saving Agriculture Ministry of Agriculture and Rural AffairsChina

The pollution of cotton fields by residual films is serious on ground that has been subjected to long-term drip irrigation in Xinjiang,China,and biodegradable mulches are therefore advocated as an alternative to plastic *** this study the mulching with biodegradable films under drip irrigation conditions in the extremely arid region of Xinjiang was investigated to determine the effects on soil hydrothermal conditions and cotton(Gossypium hirsutum L.)yield over two consecutive years(2019-2020)using plastic mulch made from polyethylene(PE)film and four types of biodegradable films,including black opaque oxidation-biodegradable film(M1),colorless transparent oxidation-biodegradable film(M2),black opaque fully biodegradable film(M3)and white translucent fully biodegradable film(M4),which had different levels of biodegradability(*** degradation times and rates).The biodegradability,soil water contents,soil temperatures and cotton yields were compared between the degradable(M1 to M4)and PE *** results indicated that M2 was degraded the quickest and showed the highest degree of degradation compared with the other degradable films and PE *** degradation rates of the various mulching films were ranked in a descending order as M2,M4,M1,M3 and PE,but the PE mulch exhibited the best performance in terms of soil water and heat conservation throughout the growth *** soil heat preservation and moisture conservation performance under biodegradable films mulching at the cotton seedling stage and budding stage was similar to that of PE *** average soil temperature at a depth of 5 cm under mulching with the degradable films was 2.66°C-5.06°C(p<0.05)lower than that under traditional PE films at the flowering *** the late stage of cotton growth,the water content of shallow soil mulched with PE film was better for plant grown than that under the biodegradable *** effect of film degradation on the shallow soil water content was much greater

关键词： arid environment biodegradable films cotton yield oasis agroecosystem soil temperature soil moisture

Epigenetics and environmental health

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Frontiers of Medicine 2024年第4期18卷 571-596页

作者： Min Zhang Ting Hu tianyu Ma Wei Huang Yan wang Key Laboratory of Cancer and Microbiome State Key Laboratory of Molecular OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100021China Beijing Key Laboratory of Cancer Invasion and Metastasis Research Department of Biochemistry and Molecular BiologySchool of Basic Medical SciencesCapital Medical UniversityBeijing100069China

Epigenetic modifications including DNA methylation,histone modifications,chromatin remodeling,and RNA modifications complicate gene regulation and heredity and profoundly impact various physiological and pathological *** recent years,accumulating evidence indicates that epigenetics is vulnerable to environmental changes and regulates the growth,development,and diseases of individuals by affecting chromatin activity and regulating gene *** exposure or induced epigenetic changes can regulate the state of development and lead to developmental disorders,aging,cardiovascular disease,Alzheimer's disease,cancers,and so ***,epigenetic modifications are *** use of specific epigenetic inhibitors targeting epigenetic changes in response to environmental exposure is useful in disease ***,we provide an overview of the role of epigenetics in various ***,we summarize the mechanism of epigenetic alterations induced by different environmental exposures,the influence of different environmental exposures,and the crosstalk between environmental variation epigenetics,and genes that are implicated in the body's ***,the interaction of multiple factors and epigenetics in regulating the initiation and progression of various diseases complicates clinical *** discuss some commonly used epigenetic drugs targeting epigenetic modifications and methods to prevent or relieve various diseases regulated by environmental exposure and epigenetics through diet.

关键词： epigenetics environmental exposure health prevention and therapy

The Journey/DAO/TAO of Embodied Intelligence: From Large Models to Foundation Intelligence and Parallel Intelligence

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1313-1316页

作者： tianyu Shen Jinlin Sun Shihan Kong Yutong wang Juanjuan Li Xuan Li Fei-Yue wang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory for Turbulence and Complex Systems Department of Advanced Manufacturing and RoboticsCollege of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Peng Cheng Laboratory Shenzhen 518000China State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China IEEE

THE tremendous impact of large models represented by ChatGPT[1]-[3]makes it necessary to con-sider the practical applications of such models[4].However,for an artificial intelligence(AI)to truly evolve,it needs to possess a physical“body”to transition from the virtual world to the real world and evolve through interaction with the real *** this context,“embodied intelligence”has sparked a new wave of research and technology,leading AI beyond the digital realm into a new paradigm that can actively act and perceive in a physical environment through tangible entities such as robots and automated devices[5].

关键词： Intelligence DAO TAO