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Heat front propagation in shale oil reservoirs during air injection:Experimental and numerical studies

Petroleum Science 2024年第5期21卷 3379-3389页

作者： Shuai Zhao Chun-Yun Xu Wan-Fen Pu Qing-yuan Chen cheng-dong yuan Mikhail A.Varfolomeev Vladislav Sudakov State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Tianfu Yongxing Laboratory Chengdu610213SichuanChina Department of Petroleum Engineering Kazan Federal UniversityKazan420008Russia Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazan420008Russia Center for Petroleum Science and Engineering Skolkovo Institute of Science and TechnologyMoscow121205Russia

Air injection technique for developing shale oil has gained significant attention. However, the ability of the heat front to consistently propagate within the shale during air injection remains uncertain. To address this, we investigated the heat front propagation within oil-detritus mixtures, shale cores, and fractured shale cores using a self-designed combustion tube(CT) and experimental schemes. By integrating the results obtained from high-pressure differential scanning calorimetry and CT, we developed a comprehensive reaction kinetics model to accurately analyze the main factors influencing the heat front propagation within fractured shale. The findings revealed that in the absence of additional fractures, the heat front failed to propagate within the tight shale. The flow of gases and liquids towards the shale core was impeded, resulting in the formation of a high-pressure zone at the front region of the shale. This pressure buildup significantly hindered air injection, leading to inadequate oxygen supply and the extinguishment of the heat front. However, the study demonstrated the stable propagation of the heat front within the oil-detritus mixtures, indicating the good combustion activity of the shale ***, the heat front successfully propagated within the fractured shale, generating a substantial amount of heat that facilitated the creation of fractures and enhanced gas injection and shale oil flow. It was important to note that after the heat front passed through the shale, the combustion intensity decreased. The simulation results indicated that injecting air into the main fracturing layers of the shale oil reservoir enabled the establishment of a stable heat front. Increasing the reservoir temperature(from 63 to 143℃) and oxygen concentration in the injected gas(from 11% to 21%) promoted notable heat front propagation and increased the average temperature of the heat front. It was concluded that temperature and oxygen concentration had the mos

关键词： Heat front propagation Shale oil Kinetics model Combustion tube Air injection

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A New Iridoid Glycoside and a New Iridoid from Pedicularis kansuensis f. albiflora

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Chinese Chemical Letters 2003年第9期14卷 932-933页

作者： cheng Shan yuan, Wei dong XIE, Xiu Ping YANG, Zhong Jian JIADepartment of Chemistry, National Laboratory of Applied Organic Chemistry, Lanzhou University,Lanzhou 730000 Department of Chemistry Natl. Lab. of Appl. Organ. Chemistry Lanzhou University Lanzhou 730000 China

A new iridoid glycoside 1 and a new iridoid 2 were isolated from the whole plant of Pedicularis kansuensis f. albiflora. Their structures were elucidated by spectroscopie methods.

关键词： Pedicularis kansuensis f. albiflora Scrophulariaceae iridoid glycoside iridoid.

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Reflection and Prospect about the Development of Rural Mobile Commerce in China

Reflection and Prospect about the Development of Rural Mobil...

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2011 International Conference on Information Management and Engineering(ICIME 2011)

作者： Xu Chao-yi cheng yuan-dong School of Economics and Management Anhui University of Science & Technology

ISBN: (纸本)9781612842387

M-commerce (mobile commerce) is a breakthrough of our new rural informatization construction. This article discusses relevant concepts and characteristics of M-commerce, summarizes the present developing situation of our country rural M-commerce, and points out the problems existing in the development and countermeasures, and on this basis predicts the developing prospect of our country rural M-commerce.

关键词： countryside mobile commerce developing situation countermeasures prospect

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一款应用于FTTH的CATV光接收机的设计

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光通信技术 2006年第7期30卷 60-62页

作者：程远东四川信息职业技术学院四川广元628017

在分析国内外FTTH光接收机应用前景的基础上,设计并实现了一款应用于FTTH的CATV光接收机。在低动态接收、高灵敏度和成本方面有较大突破,光功率接收范围达到-8～0dBm,功耗降低到约3W,制造成本降低到300元左右,具有很好的实用价值。

关键词：光接收机 PIN管匹配电路前置放大电路功率放大电路

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Resistance of Cement-based Grouting Materials with Nano- SiO_(2) Emulsion to Chloride Ion Penetration

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 114-119页

作者： LI Shuiping cheng Jian WEI Chao yuan Bin YU chengxiao College of Architectural Science and Engineering Yangzhou UniversityYangzhou 225127China

The chloride penetration resistance of cement-based grout materials was improved by nano-silica *** of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride solutions of specific concentrations with different test *** properties of the mixes were assessed in terms of weight loss and compressive strength.X-ray diffraction(XRD)and scanning electron microscopy(SEM)of mixes were performed to analysis the phase evolution and *** results demonstrated that the introduction of nano-SiO_(2) emulsion significantly decreased the compressive strength loss and calcium hydroxide(CH)crystal content of hydration production,and then enhanced the resistance of cement-based grouting materials to chloride ion *** improvement derives from the filling and pozzolanic effects of nano-SiO_(2) particles,which were incorporated via an emulsion and attributed to a well dispersion in grouting matrix.

关键词： grouting materials nano-SiO_(2)emulsion chloride ion penetration,weight loss strength loss

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物联网时代RFID在数字化图书馆中的应用

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制造业自动化 2011年第9期33卷 130-132页

作者：程远东四川信息职业技术学院广元628017

物联网将会是"第三次信息技术革命",物联网时代到来指日可待。本文在对物联网定义、RFID技术、数字化图书馆未来发展趋向充分分析的基础上,提出了物联网时代RFID系统在数字化图书馆中的应用架构和广泛前景。

关键词： RFID 数字化图书馆应用

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AECT2010年会主题内容与启示

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外语电化教学 2011年第1期 78-80页

作者：程东元解放军外国语学院

AECT2010年会于10月下旬在美国西海岸顺利召开，大会围绕“赛博变革：在我们的联网世界中学习”这一主题展开探索和交流，达到了预定的目标。作为会议的参加者，作者在介绍大会主要内容的基础上，着重谈了三点感悟。一是关于教育技术学... 详细信息

AECT2010年会于10月下旬在美国西海岸顺利召开，大会围绕“赛博变革：在我们的联网世界中学习”这一主题展开探索和交流，达到了预定的目标。作为会议的参加者，作者在介绍大会主要内容的基础上，着重谈了三点感悟。一是关于教育技术学科的定位和前景问题；二是关于现代教育思想源头的思考；三是关于开会的形式与内容之间的关系。

关键词： AECT年会内容综述启示

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A Hybrid Approach for Pavement Crack Detection Using Mask R-CNN and Vision Transformer Model

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Computers, Materials & Continua 2025年第1期82卷 561-577页

作者： Shorouq Alshawabkeh Li Wu Daojun dong Yao cheng Liping Li Faculty of Engineering China University of GeosciencesWuhan430074China

Detecting pavement cracks is critical for road safety and infrastructure *** methods,relying on manual inspection and basic image processing,are time-consuming and prone to *** deep-learning(DL)methods automate crack detection,but many still struggle with variable crack patterns and environmental *** study aims to address these limitations by introducing the Masker Transformer,a novel hybrid deep learning model that integrates the precise localization capabilities of Mask Region-based Convolutional Neural Network(Mask R-CNN)with the global contextual awareness of Vision Transformer(ViT).The research focuses on leveraging the strengths of both architectures to enhance segmentation accuracy and adaptability across different pavement *** evaluated the performance of theMaskerTransformer against other state-of-theartmodels such asU-Net,TransformerU-Net(TransUNet),U-NetTransformer(UNETr),SwinU-NetTransformer(Swin-UNETr),You Only Look Once version 8(YoloV8),and Mask R-CNN using two benchmark datasets:Crack500 and *** findings reveal that the MaskerTransformer significantly outperforms the existing models,achieving the highest Dice SimilarityCoefficient(DSC),precision,recall,and F1-Score across both ***,the model attained a DSC of 80.04%on Crack500 and 91.37%on DeepCrack,demonstrating superior segmentation accuracy and *** high precision and recall rates further substantiate its effectiveness in real-world applications,suggesting that the Masker Transformer can serve as a robust tool for automated pavement crack detection,potentially replacing more traditional methods.

关键词： Pavement crack segmentation transportation deep learning vision transformer Mask R-CNN image segmentation

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一组老年群体中超高龄和老年人脑损伤发生率、年龄、致伤因素及重残率分析:超高龄组0.77%(103/1978),老年组0.08%(180/16514)

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中国临床康复 2005年第21期9卷 55-57页

作者：周涛程东源朱儒远解放军总医院神经外科北京市100853

目的:探讨老年人颅脑损伤的发病和临床诊治特点。方法:对1999-01-01/2003-12-31在解放军总医院定点就医的一组老年人群(年均18492人)中210例颅脑损伤患者发病时的身体状况,发病率及受伤特点,病程及治疗和预后等临床资料进行回顾性总结... 详细信息

目的:探讨老年人颅脑损伤的发病和临床诊治特点。方法:对1999-01-01/2003-12-31在解放军总医院定点就医的一组老年人群(年均18492人)中210例颅脑损伤患者发病时的身体状况,发病率及受伤特点,病程及治疗和预后等临床资料进行回顾性总结。该组老年人在建档案时已被分为两个亚组:超高龄组(平均年龄79.75岁,1978人)和老年组(平均年龄69.42岁,16514人)。以同期其他人群的脑损伤187例作为对照组,并进行两组回顾资料的比较。结果:按意向处理分析,397例均进入结果分析。①发病时的身体状况:超高龄组和老年组平均年龄明显高于对照组[(79.75±8.13),(69.42±10.85),(45.21±15.32)岁];患者自身患有单器官(主要为心、肺、脑、肾)或多器官疾病的超高龄组高达85.43%,高于老年组和对照组(45.79%,2.67%)。②发病率及受伤特点:超高龄组发病率明显高于老年组(0.77%,0.08%)。超高龄组中摔伤占90.29%,而交通伤和其他伤很少。老年组和对照组中,均为交通伤占主要伤因。③治疗及病程:在对照组和老年组中均有超过80%患者手术治疗,而超高龄组仅有53.40%的患者接受手术治疗。超高龄组和老年组中,伤后或术后出现心、肺、脑、肾等功能受损或者原有慢性病加重以及感染、再出血、神经功能缺失等并发症均高于对照组(24.27%,12.15%,8.02%)。超高龄组和老年组患者的住院天数远超对照组[(58.13±36.54),(39.61±21.12),(18.21±10.25)d]。④预后:各组的死亡率和重残比率均没有明显差别。结论:①老年人群脑损伤的致伤原因主要是摔伤、受伤时自身多患有单器官心、肺、脑、肾或多器官疾病,因此对老年人,尤其是超高龄患者的脑损伤治疗方案的选择应慎重。②老年人脑损伤占用医疗资源多,但积极治疗仍可获得较好疗效。③回顾性资料记载超高龄组是能够检索到的国内外老年人脑损伤平均年龄最高的一组,对超高龄脑损伤的相关分析是有临床借鉴意义。

关键词：老年人脑损伤多器官功能衰竭并发症

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“Zero‑Strain” NiNb_(2)O_(6) Fibers for All‑Climate Lithium Storage

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Nano-Micro Letters 2025年第1期17卷 348-360页

作者： Yan Zhao Qiang yuan Liting Yang Guisheng Liang Yifeng cheng Limin Wu Chunfu Lin Renchao Che College of Physics Donghua UniversityShanghai 201620People’s Republic of China School of Materials Science and Engineering Institute of Materials for Energy and EnvironmentQingdao UniversityQingdao 266071People’s Republic of China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China Inner Mongolia University Hohhot 010021People’s Republic of China

Niobates are promising all-climate Li^(+)-storage anode material due to their fast charge transport,large specific capacities,and resistance to electrolyte ***,their moderate unit-cellvolume expansion(generally 5%–10%)during Li^(+)storage causes unsatisfactory long-term ***,“zero-strain”NiNb_(2)O_(6) fibers are explored as a new anode material with comprehensively good electrochemical *** Li^(+)storage,the expansion of electrochemical inactive NiO_(6) octahedra almost fully offsets the shrinkage of active NbO_(6) octahedra through reversible O *** superior volume-accommodation capability of the NiO_(6) layers guarantees the“zero-strain”behavior of NiNb_(2)O_(6) in a broad temperature range(0.53%//0.51%//0.74%at 25//−10//60℃),leading to the excellent cyclability of the NiNb_(2)O_(6) fibers(92.8%//99.2%//91.1%capacity retention after 1000//2000//1000 cycles at 10C and 25//−10//60℃).This NiNb_(2)O_(6) material further exhibits a large reversible capacity(300//184//318 mAh g−1 at 0.1C and 25//−10//60℃)and outstanding rate performance(10 to 0.5C capacity percentage of 64.3%//50.0%//65.4%at 25//−10//60℃).Therefore,the NiNb_(2)O_(6) fibers are especially suitable for large-capacity,fast-charging,long-life,and all-climate lithium-ion batteries.

关键词： NiNb_(2)O_(6)porous fiber “Zero-strain”mechanism Electrochemical property Harsh-temperature operation Operando characterization

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