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Integrating well logs, 3D seismic, and earthquake data for comprehensive prediction of 3D in-situ stress orientations: A case study from the Weiyuan area in the Sichuan Basin, China

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Petroleum Science 2025年第1期22卷 210-221页

作者： Huan Cao yang zhao Hai-Chao Chen Le-Le Zhang Cheng-Gang Xian Ji-Dong yang Lu Liu State Key Laboratory of Petroleum Resources and Engineering and Unconventional Petroleum Research Institute China University of Petroleum (Beijing) Department of Geophysics China University of Petroleum (East China) Aramco Beijing Research Center Aramco Asia

Determining the orientation of in-situ stresses is crucial for various geoscience and engineering applications. Conventional methods for estimating these stress orientations often depend on focal mechanism solutions(FMSs) derived from earthquake data and formation micro-imager(FMI) data from well ***, these techniques can be costly, depth-inaccurate, and may lack spatial coverage. To address this issue, we introduce the use of three-dimensional(3D) seismic data(active sources) as a lateral constraint to approximate the 3D stress orientation field. Recognizing that both stress and fracture patterns are closely related to seismic velocity anisotropy, we derive the orientation of azimuthal anisotropy from multi-azimuth 3D seismic data to compensate for the lack of spatial stress orientation information. We apply our proposed workflow to a case study in the Weiyuan area of the Sichuan Basin, China, a region targeted for shale gas production. By integrating diverse datasets, including 3D seismic, earthquakes, and well logs, we develop a comprehensive 3D model of in-situ stress(orientations and magnitudes). Our results demonstrate that the estimated anisotropy orientations from 3D seismic data are consistent with the direction of maximum horizontal principal stress(SHmax) obtained from FMIs. We analyzed 12earthquakes(magnitude > 3) recorded between 2016 and 2020 for their FMSs and compressional axis(Paxis) orientations. The derived SHmax direction from our 3D stress model is 110°ES(East-South), which shows excellent agreement with the FMSs(within 3.96°). This close alignment validates the reliability and precision of our integrated method for predicting 3D SHmax orientations.

关键词： In-situ stress orientation SHmax Azimuthal velocity anisotropy Focal source mechanism Formation micro-imager

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A dry-electrode enabled ECG-on-Chip with arrhythmia-aware data transmission

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Science China(Information Sciences) 2025年第2期68卷 338-353页

作者： Xinzi XU Yanxing SUO yang zhao Peiyi ZHOU Xiao HAN Qiao CAI Min WANG Jiajun YUAN Liebin zhao Yongfu LI Guoxing WANG Yong LIAN Department of Micro-Nano Electronics and MoE Key Lab of Artificial Intelligence Shanghai Jiao Tong University Pediatric AI Clinical Application and Research Center Shanghai Engineering Research Center of Intelligence Pediatrics (SERCIP)Child Health Advocacy InstituteShanghai Children's Medical CenterSchool of MedicineShanghai Jiao Tong University Shanghai Engineering Research Center of Intelligence Pediatrics (SERCIP) Xin Hua Hospital Affiliate to Shanghai Jiao Tong University School of Medicine

Early detection and treatment of cardiovascular diseases(CVDs) can be significantly enhanced through the use of flexible wearable electrocardiogram(ECG) sensors, potentially reducing CVD-related mortality. This paper introduces an ECG-on-Chip(EoC) solution tailored for flexible ECG sensors, incorporating novel features to address common challenges in wearable ECG technology. The EoC integrates a chopper-stabilized capacitively-coupled instrumentation amplifier(CS-CCIA),ensuring a high common-mode rejection ratio(CMRR) and low noise performance. Performance is further boosted via a positive feedback loop(PFL) and a programmable gain amplifier(PGA) with shared on-chip calibration logic, which enhances input impedance and minimizes gain variability to ensure consistent algorithm performance. Additionally, a secondary chopping technique is employed to further reduce noise, achieving an input-referred noise level of 454 nVrms. The embedded algorithm within the EoC is designed to extract clinically meaningful features, facilitating robust real-time arrhythmia analysis. Fabricated using a 0.18 μm CMOS process, the EoC consumes 14.9 μW with a supply voltage of 1.2 V. The algorithm's efficacy has been validated over 0.4 million heartbeats, demonstrating a sensitivity of over 99.7% for R-peak detection and 98.3% for arrhythmia analysis. To demonstrate practical application, the EoC has been integrated with a commercial Bluetooth low energy(BLE)transceiver, forming a wireless arrhythmia monitoring sensor equipped with dry electrodes. This system consumes 292.04 μW in arrhythmia-aware transmission mode, supporting 13 days of operation with a 30 mAh thin-film battery.

关键词： ECG flexible dry electrodes analog front-end abnormality detection ASIC wireless transmission

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Review of rare earth oxide doping-modified laser cladding of Fe-based alloy coatings

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China Foundry 2025年第1期22卷 12-22页

作者： Han-yu Zhou Li-yao Li yang zhao Ming-xue Shen Huo-ping zhao Ye-long Xiao Shao-peng Liu School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China

Conventional Fe-C alloy parts used in mechanical transmission and braking systems exposed to the external environment often suffer from wear and corrosion *** coating strengthening technologies have been explored to improve the surface performance and prolong service life of these *** these technologies,laser cladding has shown promise in producing Fe-based alloy coatings with superior interfacial bonding properties to the Fe-C alloy ***,the microstructure of the Fe-based alloy coating is more uniform and the grain size is finer than that of surfacing welding,thermal spraying,and plasma cladding,and the oxide film of alloying elements on the coating surface can improve the coating ***,Fe-based alloy coatings produced by laser cladding typically exhibit lower hardness,lower wear resistance,corrosion resistance,and oxidation resistance compared to coatings based on Co and Ni ***,these coatings are susceptible to defects such as pores and *** address these limitations,the incorporation of rare-earth oxides through doping in the laser cladding process has garnered significant *** approach has demonstrated substantial improvements in the microstructure and properties of Fe-based alloy *** paper reviewed recent research on the structure and properties of laser-cladded Fe-based alloy coatings doped with various rare earth oxides,including La_(2)O_(3),CeO_(2),and Y_(2)O_(3).Specifically,it discussed the effects of rare earth oxides and their concentrations on the structure,hardness,friction,wear,corrosion,and oxidation characteristics of these ***,the mechanisms by which rare earth oxides influence the coating’s structure and properties were *** review aimed to serve as a valuable reference for the application and advancement of laser cladding technology for rare earth modified Fe-based alloy coatings.

关键词： Fe-based alloys laser cladding rare-earth oxides microstructure tribological properties

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De novo-design of highly exposed Co−N−C single-atom catalyst for oxygen reduction reaction

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燃料化学学报(中英文) 2025年第1期53卷 128-137页

作者： ZHOU Dan ZHU Hongyue zhao yang LIU Yiming Shanxi Key Laboratory of Catalysis and Energy Coupling School of Chemical Engineering and TechnologyTaiyuan University of Science and TechnologyTaiyuan 030024China Dalian National Laboratory for Clean Energy(DNL) Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

The nitrogen-coordinated metal single-atom catalysts(M−N−C SACs)with an ultra-high metal loading synthetized by direct high-temperature pyrolysis have been widely ***,most of metal single atoms in these catalysts were buried in the carbon matrix,resulting in a low metal utilization and inaccessibility for adsorption of reactants during the catalytic ***,we reported a facile synthesis based on the hard-soft acid-base(HSAB)theory to fabricate Co single-atom catalysts with highly exposed metal atoms ligated to the external pyridinic-N sites of a nitrogen-doped carbon *** from the highly accessible Co active sites,the prepared Co−N−C SAC exhibited a superior oxygen reduction reactivity comparable to that of the commercial Pt/C catalyst,showing a high turnover frequency(TOF)of 0.93 e^(−)·s^(-1)·site^(-1)at 0.85 V ***,far exceeding those of some representative SACs with a ultra-high metal *** work provides a rational strategy to design and prepare M−N−C single-atom catalysts featured with high site-accessibility and site-density.

关键词： hard-soft acid-base Co−N−C single-atom catalyst highly accessible active sites oxygen reduction reaction

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Effect of SiO_(2) Nanoparticles/Silicate on Characteristics of Micro-arc Oxidation Coating Formed on TC4 Alloy

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稀有金属材料与工程 2025年第1期54卷 76-83页

作者： Sun Fengyu yang zhao Hu Jie Gong Yunbai Wang Ping Luo Qiming Zhu Manlan School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission Nanjing 210046China

TC4 micro-arc oxidation(MAO)coatings were prepared by adding SiO_(2) nanoparticles or sodium silicate to the sodium meta-aluminate-based *** effect of additives was investigated by XRD,SEM,EDS,electrochemical and wear *** results show that additives can considerably accelerate the formation of MAO *** coatings are mostly composed of rutile and anatase TiO_(2),α-Al_(2)O_(3),γ-Al_(2)O_(3),Al_(2)TiO_(5) and SiO_(2).Sodium silicate and SiO_(2) nanoparticles added to the coating can effectively reduce the size of micropores and increase its thickness,whereas SiO_(2) nanoparticles with superior physical properties can be directly deposited at the discharge channel,significantly increasing the coating's resistance to wear and *** coating with SiO_(2) nanoparticles exhibits the best overall performance,with the lowest corrosion rate and average friction coefficient of 4.095×10^(-5)mm/a and 0.30,respectively.

关键词： micro-arc oxidation TC4 alloy coatings corrosion wea

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新型盐渍土基泡沫轻质土隔断层阻盐机制及效果研究

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岩土力学 2025年第2期46卷 515-526,538页

作者：张荣赵斌郑小川陈令卢正赵阳中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国科学院大学北京100049 中国电建集团重庆工程有限公司重庆400060 锐博新能源集团有限公司浙江台州317608 中国科学院武汉岩土力学研究所环境岩土工程湖北省重点实验室湖北武汉430071 新疆交通规划勘察设计研究院有限公司新疆乌鲁木齐830006

盐渍土广泛分布于我国西部地区,其盐胀特性对道路工程产生严重危害,研究盐渍土路基水盐迁移规律并切断其路径对盐渍土地区道路安全防治起到关键作用。基于开挖废土利用构想,提出一种新型盐渍土基泡沫轻质土作为盐渍土地区路基隔断层。... 详细信息

盐渍土广泛分布于我国西部地区,其盐胀特性对道路工程产生严重危害,研究盐渍土路基水盐迁移规律并切断其路径对盐渍土地区道路安全防治起到关键作用。基于开挖废土利用构想,提出一种新型盐渍土基泡沫轻质土作为盐渍土地区路基隔断层。采用自研设备开展相关试验,测试其内部温度变化、竖向位移及冻融后的水盐分布,分析新型泡沫轻质土隔断层的隔盐消胀效果,并从微观结构角度探究阻盐机制。结果表明:在温度梯度下,盐渍土试样内部水分与盐分向上迁移,多在中上部聚集。新型泡沫轻质土隔断层能有效阻隔水盐上迁并抑制盐胀,土体含盐量越高,抑胀效果越好。盐分在泡沫轻质土孔洞内析出结晶成盐壳,泡沫轻质土的多孔结构不仅能有效储存盐分,而且能阻隔盐分迁移,使盐分结晶在其内部进行,从而减少盐胀对土体的破坏。

关键词：盐渍土水盐迁移隔断层冻融循环泡沫轻质土

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LncRNA SNHG20靶向调控miR-520c-3p/RAB22A通路对人口腔鳞状细胞癌细胞上皮间质转化及微管形成的影响

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北京大学学报(医学版) 2025年第1期57卷 26-32页

作者：马民英晁晓芹赵扬赵国廷青海省第五人民医院青海省肿瘤医院口腔科西宁810001

目的:探究LncRNA SNHG20靶向调控miR-520c-3p/RAB22A通路对人口腔鳞状细胞癌(oral squamous cell carcinoma,OSCC)细胞上皮间质转化(epithelial-mesenchymal transition,EMT)及微管形成的影响。方法:检测OSCC细胞及组织中LncRNA SNHG20、miR-520c-3p、RAB22A mRNA水平及其相互间关系。将OSCC细胞分为对照组、sh-NC组、sh-SNHG20组、sh-SNHG20+anti-NC组、sh-SNHG20+anti-miR-520c-3p组,检测OSCC细胞EMT蛋白表达,检测微管形成数量变化,裸鼠成瘤实验检测LncRNA SNHG20对OSCC肿瘤生长的影响。结果:OSCC组织和细胞中LncRNA SNHG20、RAB22A mRNA上调表达,miR-520c-3p下调表达(P<0.05);LncRNA SNHG20与miR-520c-3p、RAB22A与miR-520c-3p之间均有结合位点;与sh-NC组相比,sh-SNHG20组间质样细胞数量较少,上皮样细胞数量较多,微管结构不完整且结节数量较少,LncRNA SNHG20、RAB22A、N-cadherin、vimentin下调表达,miR-520c-3p、E-cadherin上调表达(P<0.05);与sh-SNHG20+anti-NC组相比,sh-SNHG20+anti-miR-520c-3p组间质样细胞数量较多,上皮样细胞数量较少,微管排列较紧密,微管结节数量较多,miR-520c-3p、E-cadherin下调表达,RAB22A、N-cadherin、vimentin上调表达(P<0.05)。sh-SNHG20组比sh-NC组OSCC移植瘤体积较小,质量较低,LncRNA SNHG20、RAB22A下调表达,miR-520c-3p上调表达(P<0.05)。结论:抑制LncRNA SNHG20表达能够靶向调节miR-520c-3p/RAB22A通路抑制OSCC细胞EMT和微管形成。

关键词：口腔鳞状细胞癌小核仁RNA宿主基因20 微小RNA-520c-3p Rab蛋白22a 上皮间质转化微管形成

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汉语动词隐含因果义激活模式研究

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世界汉语教学 2025年第1期39卷 99-115页

作者：田晓萌赵杨北京语言大学教师教育学院北京大学对外汉语教育学院

动词隐含因果义激活模式一直没有明确结论。本文以在线眼动视觉情境范式和离线句子补全方法为研究手段,以汉语母语者和以韩语为母语的汉语二语者为被试,对该问题进行再探究,发现了新的汉语动词隐含因果义激活模式——“动词语篇说”:当... 详细信息

动词隐含因果义激活模式一直没有明确结论。本文以在线眼动视觉情境范式和离线句子补全方法为研究手段,以汉语母语者和以韩语为母语的汉语二语者为被试,对该问题进行再探究,发现了新的汉语动词隐含因果义激活模式——“动词语篇说”:当动词自身包含隐含因果义信息,语篇连贯关系为结果-原因关系时,隐含因果义才能激活。这一模式得到了一语组和二语组的印证。两组被试的差异主要表现在隐含因果义激活速度、强度,连贯关系产出类型和运用程度等方面。

关键词：隐含因果义连贯关系激活模式眼动汉语二语习得

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超大规模太赫兹系统深度学习信道估计算法

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通信学报 2025年第1期46卷 144-156页

作者：于舒娟赵阳魏玉尧张昀高贵赵生妹南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院江苏南京210023 南京邮电大学通信与信息工程学院江苏南京210003

为了进一步提升THz超大规模MIMO系统混合场信道估计性能,基于不动点网络(FPN)引入了一种基于跨通道信息交互的Transformer注意力机制模块与快速傅里叶变换卷积网络(FCN),提出了一种基于图像恢复网络的信道估计算法FPN-OTFN,将信道估计... 详细信息

为了进一步提升THz超大规模MIMO系统混合场信道估计性能,基于不动点网络(FPN)引入了一种基于跨通道信息交互的Transformer注意力机制模块与快速傅里叶变换卷积网络(FCN),提出了一种基于图像恢复网络的信道估计算法FPN-OTFN,将信道估计问题建模为图像恢复问题。在导频处采用最小二乘算法获得初始信道信息,并将其作为所提FPN-OTFN算法的输入,通过训练学习低精度信道图像和高精度图像间的映射关系,恢复出真实的信道状态信息。仿真实验结果表明,所提算法不仅继承了FPN框架的高效性、自适应性,同时对THz信道拥有较高的估计精度和良好的鲁棒性。

关键词：信道估计 THz超大规模MIMO系统深度学习图像恢复注意力机制

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普拉梭菌上清增强肝纤维化小鼠肠道屏障功能抑制肝脏炎症

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西安交通大学学报(医学版) 2025年第1期46卷 112-118页

作者：陈曦张艾煜康桐孔光耀杨军赵阳西安交通大学精准医疗研究院陕西西安710115 西安交通大学第二附属医院生物诊断治疗国家地方联合工程研究中心陕西西安710004 西安交通大学第二附属医院病理科陕西西安710004

目的探讨普拉梭菌培养上清对小鼠肠道屏障功能和肝纤维化进展的影响。方法 24只雄性C57BL/6小鼠随机分为3组:正常对照组(Control)、肝纤维化模型组(Model)、模型小鼠+普拉梭菌上清组(Model+S)。Model组和Model+S组小鼠腹腔注射四氯化... 详细信息

目的探讨普拉梭菌培养上清对小鼠肠道屏障功能和肝纤维化进展的影响。方法 24只雄性C57BL/6小鼠随机分为3组:正常对照组(Control)、肝纤维化模型组(Model)、模型小鼠+普拉梭菌上清组(Model+S)。Model组和Model+S组小鼠腹腔注射四氯化碳诱导肝纤维化,共持续10周。造模2周后,Model+S组用细菌上清灌胃处理8周。HE染色观察结肠和肝脏组织病理形态,过碘酸雪夫染色、ELISA和异硫氰酸荧光素-葡聚糖(FITC-Dextran)荧光探针检测肠屏障功能损伤,16S rDNA测序分析肠道菌群结构变化,天狼星红染色观察肝纤维化程度,qPCR和ELISA检测肠道屏障功能、肝纤维化和炎症相关因子的表达。结果与Model组相比,Model+S组小鼠肠道损伤程度和促炎因子表达降低,多种肠道屏障功能相关基因的表达显著提高,外周血中FITC-Dextran和肝脏脂多糖浓度均显著降低(均P<0.05),肠道菌群结构得到改善。此外,与Model组相比,Model+S组小鼠的肝脏功能和肝纤维化程度无明显差异,但肝脏中炎性细胞浸润减少,Tlr4、Il-6、Tnf-α等促炎因子的表达以及IL-6浓度显著降低(均P<0.05)。结论普拉梭菌上清可改善肝纤维化小鼠的肠道屏障功能和肠道菌群失调,减轻肝脏炎症,但不影响肝纤维化进展。

关键词：普拉梭菌肠道屏障功能肝纤维化肠道菌群炎症

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