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Journal of Materials Science & Technology 2023年第3期134卷 81-88页

作者： Xianghui Feng Nan Li baiyi Chen Chao Zeng tianyu bai Kai Wu Yonghong Cheng Bing Xiao School of Electrical Engineering State Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China

The reaction thermodynamics for synthesizing the“312”and“413”o-MAX phases using the powder met-allurgy are investigated using a linear programing optimization algorithm based on the high-throughput first principles phonon *** validity and reliability of the current methodology are verified by correctly predicting the impurities in four experimentally known o-MAX systems including Cr-Ti-Al-C,Cr-V-Al-C,Mo-Sc-Al-C and *** formability of each investigated o-MAX phase is evaluated by means of formation enthalpy and formation Gibbs free energy in a temperature range from 0 K to 1700 *** is revealed that the thermodynamic stability of the“413”o-MAX structure is no better than that of the“312”*** formability of“413”o-MAX is also reduced at high sintering temperature,compared to that of“312”*** optimal synthetic routes are predicted for all thermodynamically stable“312”and“413”o-MAX *** is found that most o-MAX phases considered could be prepared as the single phase using the non-conventional synthetic routes from the aspect of reaction *** of them including Cr_(2)TaAlC_(2),Nb_(2)HfAlC_(2),Nb_(2)TaAlC_(2),Nb_(2)Hf_(2)AlC_(3),Nb_(2)Ta_(2)AlC_(3),Mo_(2)V_(2)AlC_(3)and Mo_(2)Ta_(2)AlC_(3)are predicted to be either destabilized at high temperature or overwhelmed by the most competing side reaction.

关键词： Thermodynamics First-principles calculation Synthesis o-MAX phase

How high can fracture porosity become in the ultra-deep subsurface?

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Geoscience Frontiers 2023年第5期14卷 233-240页

作者： Jin Lai Fei Zhao Mei Zhang tianyu bai Yuyue Huang Dong Li Guiwen Wang Ziqiang Qin State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)102249China Department of Petroleum Engineering University of WyomingLaramieWY 82071USA

Knowledge of how high can fracture porosity become in the ultra-deep burial conditions is important but remains *** aperture and porosity are measured using X-ray computed tomography(CT)at atmospheric pressure and then calculated by image *** attention is paid to how high fracture porosity can become in ultra-deep(>6000 m)settings,and which situations will result in high fracture *** situ stress magnitudes,which can be calculated using well logs,control fracture performances,and dissolution along fracture improve fracture porosity at ultra-deep burial *** horizontal stress difference(Dr45 MPa),a high degree of dissolution along the fracture dramatically increases fracture *** will result in the vuggy fracture planes and improve fracture porosity up to 2.0%.The results provide insights into the detection,characterization,and modeling of subsurface fractures.

关键词： Fracture porosity Image log Ultra-deep In-situ stress Dissolution

Geological and Engineering‘Sweet Spots'in the Permian Lucaogou Formation,Jimusar Sag,Junggar Basin

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1214-1228页

作者： LAI Jin bai tianyu LI Hongbin PANG Xiaojiao BAO Meng WANG Guiwen LIU Bingchang LIU Shichen National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China

Unconventional oil and gas resources require petrophysical logs to answer the question of how best to optimize geological and engineering‘sweet spots'.Therefore,the establishment of a key well with comprehensive descriptions of lithology,reservoir properties,hydrocarbon-bearing properties,electronic well log responses,source rock properties,brittleness,and in situ stress magnitude and direction is important for the effective exploration and production of unconventional hydrocarbon ***,thin sections,scanning electron microscopy(SEM)and comprehensive well log suites are used to build a key well for the Permian Lucaogou Formation,Jimusar Sag of the Junggar *** results show that there are three main types of lithologies,including siltstone,mudstone and *** can be predicted using the combination of conventional well and image *** pore spaces consist of interparticle pores,intragranular dissolution pores and *** Magnetic Resonance(NMR)T_(2)components longer than 1.7 ms are superposed as effective *** is calculated using the Coates model from NMR T_(2)*** ratio of T_(2)components>7.0 ms to T_(2)components>0.3 ms is used to calculate oil *** is calculated using theΔlog R *** index is calculated using Poisson-Young's method,ranging from 13.42%-70.53%.In situ stress direction is determined,and in situ stress magnitudes(maximum horizontal stress SH_(max),minimum horizontal stress Sh_(min),vertical stress S_(v))are calculated using density and sonic *** strike-slip stress type(SH_(max)>S_(v)>Sh_(min))is *** key well which comprehensively includes the above seven properties is *** and engineering(geomechanical)‘sweet spots'are then optimized from the key well by fully analyzing lithology,reservoir property,oilbearing potential,in situ stress magnitude and *** is hoped that the results support engineers'and geologists'decisions

关键词： key well unconventional oil and gas resources ‘sweet spot' well logs Lucaogou Formation Jimusar Sag

Application of geophysical well logs in solving geologic issues:Past,present and future prospect

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Geoscience Frontiers 2024年第3期15卷 85-118页

作者： Jin Lai Yang Su Lu Xiao Fei Zhao tianyu bai Yuhang Li Hongbin Li Yuyue Huang Guiwen Wang Ziqiang Qin National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Department of Petroleum Engineering University of WyomingLaramieWY 82071USA

Geophysical well logs are widely used in geological fields,however,there are considerable incompatibilities existing in solving geological issues using well log *** review critically fills the gaps between geology and geophysical well logs,as assessed from peer reviewed papers and from the authors’personal experiences,in the particular goal of solving geological issues using geophysical well *** origin and history of geophysical logging are *** follows a review of the state of knowledge for geophysical well logs in terms of type of specifications,vertical resolution,depth of investigations and demonstrated *** the current status and advances in applications of geophysical well logs in fields of structural geology,sedimentary geology and petroleum geology are *** logs are used in structural and sedimentary geology in terms of structure detection,in situ stress evaluation,sedimentary characterization,sequence stratigraphy division and fracture *** logs can also be applied in petroleum geology fields of optimizing sweet spots for hydraulic fracturing in unconventional oil and gas *** well logs are extending their application in other fields of geosciences,and geological issues will be efficiently solved via well logs with the improvements of advanced well log *** work is required in order to improve accuracy and diminish uncertainties by introducing artificial *** review provides a systematic and clear descriptions of the applications of geophysical well log data along with examples of how the data is displayed and processed for solving geologic problems.

关键词： Geophysical well logs Sequence stratigraphy Source rock Unconventional oil and gas resources Artificial intelligence

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基于单目视觉的手术器械位姿估计模型研究

激光杂志 2023年第1期44卷 32-41页

作者：王巍白天宇河北工程大学信息与电气工程学院河北邯郸056038 河北省安防信息感知与处理重点实验室河北邯郸056038 江南大学物联网工程学院江苏无锡214122

手术器械管理是整个手术过程中重要的一环,科学高效的管理手术器械对提高医疗质量具有重要意义。为有效解决人工传递和清点手术器械效率低、易出错的情况,提出了一种基于单目视觉的手术器械位姿估计模型。首先将手术器械数据集图像进行G... 详细信息

手术器械管理是整个手术过程中重要的一环,科学高效的管理手术器械对提高医疗质量具有重要意义。为有效解决人工传递和清点手术器械效率低、易出错的情况,提出了一种基于单目视觉的手术器械位姿估计模型。首先将手术器械数据集图像进行Gamma适应校正,其次把校正后的数据集放入YOLOV5进行模型权重训练与识别验证,接着将识别所得的单枚手术器械图像进行局部增强与主体提取,最后把处理结果接入到位姿估计模块中,得到手术器械的中心点与4D位姿。实验结果表明,手术器械识别精度可达到89.4%,平均平移位姿误差为3.482 mm,平均旋转角度误差为2.048度,并且在不同分辨率和灰度值下均有良好的表现,验证了该算法具有良好的精度和鲁棒性。

关键词：手术器械单目视觉位姿估计 YOLOV5 PCA主成分分析

含走向异面断续裂隙岩体破裂行为及裂隙延伸尺寸效应研究

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工程地质学报 2023年第6期31卷 1881-1890页

作者：黄达白天宇钟助河北工业大学土木与交通学院天津300400

自然岩体内部断续结构面的产状差异导致裂隙间岩桥破裂贯通成为一个复杂的三维岩石力学问题。为了探究裂隙的走向差异与尺寸效应对岩体力学行为的影响,开展了不同裂隙延伸尺寸下含走向异面断续裂隙类岩石材料的单轴压缩试验,结合CT扫描... 详细信息

自然岩体内部断续结构面的产状差异导致裂隙间岩桥破裂贯通成为一个复杂的三维岩石力学问题。为了探究裂隙的走向差异与尺寸效应对岩体力学行为的影响,开展了不同裂隙延伸尺寸下含走向异面断续裂隙类岩石材料的单轴压缩试验,结合CT扫描技术,分析了岩石走向差异角和尺寸效应对裂隙岩体破坏模式、岩桥贯通机制及力学特性的影响。研究表明:试样岩桥以外的端部主要由翼裂纹或反翼裂纹沿着荷载的方向扩展而引起破裂,岩桥区域的破裂模式受裂隙延伸尺寸和走向差异角综合影响,裂隙延伸尺寸的增加会使岩桥区域受拉因素变多,走向差异角在很大程度上减小岩桥的贯通率,并使岩桥区域贯通面的翘曲程度增大。随着裂隙延伸方向尺寸的增大,试样的峰值强度和弹性模量会随之减小然后趋于平缓,但是当裂隙增加了走向差异角后,峰值强度与弹性模量的变化规律更加复杂。走向差异角与裂隙延伸共同造成试样的整体三维不对称性,进一步影响了试样的峰值强度、弹性模量以及塑性。研究成果可为岩桥控制型复杂裂隙岩体工程的破坏机制和稳定性评价提供理论支撑。

关键词：走向异面断续裂隙裂隙破裂模式尺寸效应力学特性 CT扫描

电针联合牵张法对脊髓损伤后痉挛性膀胱安全容量的影响

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国际中医中药杂志 2015年第6期37卷 490-493页

作者：白田雨山东省交通医院康复医学科济南250031

目的：探讨电针联合牵张法对脊髓损伤（spinal cord injury, SCI）后痉挛性膀胱安全容量的影响。方法本研究为随机对照研究。将符合纳入标准的山东省交通医院康复医学科90例住院患者按随机数字表法分为3组各30例。药物治疗组口服酒石酸... 详细信息

目的：探讨电针联合牵张法对脊髓损伤（spinal cord injury, SCI）后痉挛性膀胱安全容量的影响。方法本研究为随机对照研究。将符合纳入标准的山东省交通医院康复医学科90例住院患者按随机数字表法分为3组各30例。药物治疗组口服酒石酸托特罗定片（2 mg，2次/d），电针组采用电针治疗，电针联合牵张组采用牵张法配合电针治疗，均治疗30 d。以膀胱安全容量和有效率评价疗效。结果药物组[（273.20±84.63）ml 比（179.50±59.07）ml ， t＝4.973]、电针组[（308.23±87.45）ml 比（169.17±54.58）ml，t＝7.389]、电针联合牵张组[（376.37±125.08）ml比（167.40±61.56）ml，t＝8.210]膀胱安全容量均较同组治疗前增加，其中电针联合牵张组与药物组、针刺组比较，差异均有统计学意义（P均＜0.05）。药物治疗组、电针组、电针联合牵张组有效率分别为60.0%（18/30）、83.3%（25/30）、93.3%（28/30），药物治疗组与电针组、电针联合牵张组比较，差异均有统计学意义（χ2值分别为4.022、9.317，P均＜0.05）。结论药物治疗、电针治疗以及电针联合牵张治疗均可改善 SCI 后痉挛性膀胱患者的膀胱安全容量，但电针联合牵张治疗优于药物或电针治疗。

关键词：脊髓损伤膀胱,神经原性电针牵张法

金属-有机框架材料在光电催化水分解领域的研究进展

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高等学校化学学报 2022年第1期43卷 124-136页

作者：史潇凡朱剑白田宇付子萱张冀杰卜显和南开大学材料科学与工程学院天津300350

光催化分解水是将太阳能转化为化学能的有效手段之一.相比于粉末光催化,采用H型电解池的光电催化方法具有材料选择范围大、载流子迁移和分离效率高、电极易于回收等优点.近年来,金属有机框架材料(MOFs)在光电催化水分解领域得到越来越... 详细信息

光催化分解水是将太阳能转化为化学能的有效手段之一.相比于粉末光催化,采用H型电解池的光电催化方法具有材料选择范围大、载流子迁移和分离效率高、电极易于回收等优点.近年来,金属有机框架材料(MOFs)在光电催化水分解领域得到越来越多的应用.相比于传统无机催化剂, MOFs光电极具有比表面积大、结构易于调控等独特优势.本文按照MOFs的应用形式分为纯MOFs、MOFs与其它催化剂的复合结构和MOFs衍生物3类,总结了近年来MOFs在光电催化水分解领域的研究现状和进展,介绍了光催化/电催化领域的部分典型研究成果,最后讨论了MOFs在光电催化水分解领域研究的重点和热点,并对其未来发展做出了展望.

关键词：金属-有机框架材料光电催化光电极水分解

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补肾愈骨方辅助治疗肝肾不足、筋脉失养证慢性踝关节外侧不稳术后功能康复患者20例回顾性队列研究

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中医杂志 2024年第8期65卷 836-841页

作者：邱佳明白天宇程桯中国中医科学院望京医院北京市朝阳区100102

目的分析补肾愈骨方辅助治疗肝肾不足、筋脉失养证慢性踝关节外侧不稳(CLAI)术后功能康复患者的有效性及安全性。方法回顾性收集40例接受外踝韧带修复手术治疗的肝肾不足、筋脉失养证CLAI患者的临床资料。根据是否服用补肾愈骨方分为治... 详细信息

目的分析补肾愈骨方辅助治疗肝肾不足、筋脉失养证慢性踝关节外侧不稳(CLAI)术后功能康复患者的有效性及安全性。方法回顾性收集40例接受外踝韧带修复手术治疗的肝肾不足、筋脉失养证CLAI患者的临床资料。根据是否服用补肾愈骨方分为治疗组和对照组各20例,对照组患者术后进行功能康复,治疗组在此基础上于术后第3、4周服用补肾愈骨方汤剂。分别于术前、术后3个月记录患者术侧踝关节美国足踝协会(AOFAS)量表评分,术侧踝关节屈伸活动度、内外翻活动度,术侧踝关节磁共振影像学评分,中医证候评分。检测患者术前及术后4周的肝肾功能,并记录治疗期间不良事件。结果与术前比较,两组患者术后3个月AOFAS量表评分升高、中医证候评分均降低(P<0.01),治疗组术侧踝关节内外翻活动度、影像学评分均升高(P<0.05或P<0.01),对照组术侧踝关节屈伸活动度降低(P<0.05)。术后3个月,治疗组AOFAS量表评分高于对照组,中医证候评分低于对照组(P<0.05或P<0.01)。治疗组报告胃肠道反应2例,停药后自行缓解,肝肾功能指标未见异常。结论补肾愈骨方可以促进肝肾不足、筋脉失养证CLAI患者术后踝关节功能康复,改善临床症状,且安全性较好。

关键词：慢性踝关节外侧不稳韧带损伤关节活动度肝肾不足筋脉失养补肾愈骨方

Research on resting spontaneous brain activity and functional connectivity of acupuncture at uterine acupoints

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Digital Chinese Medicine 2022年第1期5卷 59-67页

作者： YUAN Hang YU Xiaohua LI Xiang QIN Sijun LIANG Guixiang bai tianyu WEI Benzheng Qingdao Academy of Chinese Medical Sciences Shandong University of Traditional Chinese MedicineQingdaoShandong 266112China Center for Medical Artificial Intelligence Shandong University of Traditional Chinese MedicineQingdaoShandong 266112China School of Acupuncture-Moxibustion and Tuina Shandong University of Traditional Chinese MedicineJinanShandong 250355China Department of Acupuncture-Moxibustion and Tuina Shandong Provincial Third HospitalJinanShandong 250031China

Objective The resting-state functional magnetic resonance imaging(rs-f MRI)method was used to observe brain activity and its functional connection upon electroacupuncture stimulation at bilateral uterine acupoints(EX-CA1),as well as to investigate the mechanism of acupuncture in the treatment of gynecological *** Twenty-two healthy female subjects were stimulated by electroacupuncture at bilateral uterine acupoints;rs-f MRI data of the brain were acquired and *** centrality(DC),amplitude of low-frequency fluctuation(ALFF),and regional homogeneity(ReHo)were used to analyze local spontaneous brain activity via *** independent component analysis was used to evaluate the functional connectivity of the resting brain networks after *** Analytical results showed that the neural activity intensity of the precuneus lobe,orbitofrontal cortex,lingual gyrus,amygdala,and posterior central gyrus decreased after acupuncture(voxel P<0.001,cluster P<0.05).Functional connectivity analysis revealed weakened auditory and right frontal-parietal networks(voxel P<0.001,cluster P<0.05),enhanced visual network(voxel P<0.001,cluster P<0.05),and synergistic auditory network and hypothalamic-pituitary *** Significant differences in neural activity and functional connectivity in specific brain regions were observed after acupuncture intervention at uterine acupoints;the hypothalamic-pituitary system also showed various active states in different brain *** is speculated that the effective mechanism of acupuncture at uterine acupoints is related to the regulation of reproductive hormones,emotional changes,and somatic ***,the methods used in this study could clarify the neural mechanism of uterine-point acupuncture in the treatment of gynecological diseases and may serve as a reference for other studies pertaining to acupuncture.

关键词： Uterine acupoints Acupuncture Functional magnetic resonance imaging Local spontaneous brain activity analysis Resting state Functional connectivity