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壳源富氦天然气藏潜在氦源岩主要特征及有效性分析

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天然气地球科学 2024年第3期35卷 507-517页

作者：赵栋王晓锋刘文汇张东东李孝甫西北大学地质学系大陆动力学国家重点实验室陕西西安710069 西安石油大学实验室管理处(实验中心) 陕西西安710065 中国石化石油勘探开发研究院北京100083

潜在氦源岩有效性评价是氦资源勘探开发领域关注的核心问题,但在以往的研究中,潜在氦源岩有效性评价多以岩石U、Th元素含量及年龄为主,未能全面表征影响氦源岩有效性的关键因素。为此,以花岗岩、泥页岩、片麻岩、铝土岩4种典型潜在氦源... 详细信息

潜在氦源岩有效性评价是氦资源勘探开发领域关注的核心问题,但在以往的研究中,潜在氦源岩有效性评价多以岩石U、Th元素含量及年龄为主,未能全面表征影响氦源岩有效性的关键因素。为此,以花岗岩、泥页岩、片麻岩、铝土岩4种典型潜在氦源岩为研究对象,通过建立孔隙水累积溶解氦计算模型同时结合气藏实例,对各潜在氦源岩孔隙中溶解氦的累积、脱溶情况进行定量分析,从而对各潜在氦源岩有效性及有效氦源岩评价方法进行讨论与总结。研究认为:(1)潜在氦源岩孔隙中积累的溶解氦能否在适宜条件下规模性脱溶为游离氦是判识潜在氦源岩是否有效的关键性先决条件;(2)除岩石U、Th元素含量外,巨大的体量规模,适宜的孔隙度和含水饱和度,良好的“沉积埋藏史—气藏成藏史—构造演化史”时空匹配关系,以及相对专一的生氦能力也是评判潜在氦源岩有效性的关键参数;(3)通过建立溶解氦富集效率(η_(He))计算方法,认为在相同条件下花岗岩最易形成游离氦富集,泥页岩与铝土岩次之,片麻岩最难。

关键词：壳源氦有效氦源岩溶解量脱溶富集富集效率

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直肠癌基于磁共振成像的深度学习研究进展

磁共振成像 2024年第3期15卷 218-222页

作者：石晟铭肖玲清马佳琪刘晗武玉鹏李晓夫哈尔滨医科大学附属第二医院磁共振成像诊断科哈尔滨150086 新疆生产建设兵团第十师北屯医院总医院影像中心北屯836099

直肠癌(rectal cancer,RC)是一种在全球范围内发病率较高的恶性肿瘤,对其的管理和治疗均面临着显著的挑战。MRI是评估RC的常规手段,然而常规MRI及功能MRI由于各自固有的局限性常常无法为RC患者提供足够的信息,以支持个性化的治疗计划。... 详细信息

直肠癌(rectal cancer,RC)是一种在全球范围内发病率较高的恶性肿瘤,对其的管理和治疗均面临着显著的挑战。MRI是评估RC的常规手段,然而常规MRI及功能MRI由于各自固有的局限性常常无法为RC患者提供足够的信息,以支持个性化的治疗计划。随着近年来人工智能在医疗界的迅速进展,深度学习技术在评估RC分期、治疗反应、RC分割和基因分型等方面已经展现出极大的潜力和广阔的应用前景。本文就基于MRI的深度学习技术在RC中的应用作一综述,以期为RC患者选择最佳治疗方案提供参考,从而改善患者的预后,并希望能对未来的科研工作提供新思路与新方向。

关键词：直肠癌磁共振成像深度学习预测性能

Accumulation mechanism of mantle-derived helium resources in petroliferous basins, eastern China

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Science China Earth Sciences 2022年第12期65卷 2322-2334页

作者： Xiaofeng WANG Quanyou liU Wenhui liU Dongdong ZHANG xiaofu li Dong ZHAO State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Institute of Energy Peking UniversityBeijing 100871China Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China

A series of marginal-sea basins and fault-depression basins were formed in eastern China under the background of subduction of the West Pacific *** types of helium-rich natural gas reservoirs(He>1000 ppm,1 ppm=1μmol mol^(-1))have been found in these basins:helium-rich CO_(2)gas reservoirs,helium-rich N_(2)gas reservoirs,and helium-rich hydrocarbon gas *** on the analysis of gas geochemical data,the source and accumulation mechanism of helium in these heliumrich natural gas reservoirs were ***-rich natural gas has relatively high 3He/4He ratios(0.88-4.91 Ra,average 2.82 Ra).The ^(3)He/^(4)He ratio characteristics of mantle xenoliths and mantle-derived CO_(2)gas reservoirs indicate that the helium in these helium-rich natural gas reservoirs is mainly mantle-derived(>70%).The original mantle volatile is mainly CO_(2)with a low helium concentration(Helium in the gas reservoir is mainly related to the dissolution and mineralization of CO_(2).During this process,the CO_(2)/3He ratio decreases from 2×10^(9)to approximately 2×10^(6).As CO_(2)dissolves and mineralizes,the concentration of conservative gases(He and N_(2))increases in the remaining CO_(2)gas proportionally to the loss of CO_(2).Large amounts of carbonate minerals,such as dawsonite,which are relatively enriched in 13C,are found in CO_(2)reservoirs in eastern *** relative enrichment of^(12)C in residual CO_(2)gas is important evidence of the dissolution and mineralization of CO_(2).The relative abundance of mantle-derived helium and N_(2)gas increases thousands of times during the dissolution and mineralization of CO_(2),which is the main accumulation mechanism of mantle-derived helium-rich CO_(2)gas reservoirs and helium-rich N_(2)gas ***-rich gas from the mantle is mixed with alkane gas generated by organic matter in the sedimentary basin to form helium-rich hydrocarbon gas reservoirs.

关键词： Mantle-derived helium ^(3)He/4He ratio,Helium resources,Helium-rich natural gas,Accumulation mechanism

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某型发动机异常停车故障研究

机械管理开发 2024年第4期39卷 267-269,285页

作者：景振龙李晓甫行锋森中国航发南方工业有限公司湖南株洲412002

发动机异常停车故障直接威胁发动机的安全高效运行,甚至导致事故,快速准确排除故障对于发动机的安全运行意义重大.基于此,结合某型发动机原理、现场检查、验证等情况,列出相关系统因素,建立异常停车故障树.通过对故障树底事件进行逐个... 详细信息

发动机异常停车故障直接威胁发动机的安全高效运行,甚至导致事故,快速准确排除故障对于发动机的安全运行意义重大.基于此,结合某型发动机原理、现场检查、验证等情况,列出相关系统因素,建立异常停车故障树.通过对故障树底事件进行逐个分析、验证排查,找出故障原因,制定预防措施,提出外场检查方案.

关键词：发动机故障异常停车故障树预防方案

Replacement Strategy for Aged Transformers Based on Condition Monitoring and System Risk

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电力系统自动化 2013年第17期37卷 64-71页

作者： Dabo ZHANG Wenyuan li xiaofu XIONG 1.StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology ChongqingUniversityChongqing400030China~2.BCHydroVancouverV6B5R3Canada

This paper presents a replacement strategy for an aged transformer based on condition monitoring and system risk. The condition monitoring measurements are used to estimate the insulation age of the transformer. The unavailability because of transformer aging failure is calculated using the insulation age instead of the traditional natural age. The system risk is assessed using the total unavailability from both aging and repairable failures. The expected damage cost and benefit due to delaying the replacement of the transformer are evaluated. The best replacement timing is determined as the year when the replacement of the transformer reaches the maximum net benefit. A case study for two aged transformers in a utility system demonstrates the effectiveness of the proposed method.

关键词：系统风险替换策略状态监测变形金刚老年老化故障风险评估变压器

Bipolar membrane electrodialysis integrated with in-situ CO_(2)absorption for simulated seawater concentrate utilization,carbon storage and production of sodium carbonate

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Journal of Environmental Sciences 2024年第8期142卷 21-32页

作者： Jingtao Bi Tianyi Chen Yue Xie Ruochen Shen Bin li Mengmeng Sun xiaofu Guo Yingying Zhao School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300401China Engineering Research Center of Seawater Utilization Technology of Ministry of Education School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300401China Hebei Collaborative Innovation Center of Modern Marine Chemical Technology Tianjin 300401China Tianjin Key Laboratory of Chemical Process Safety Tianjin 300130China Shandong Technology Innovation Center of Seawater and Brine Efficient Utilization Weifang 262737China

In the context of carbon capture,utilization,and storage,the high-value utilization of carbon storage presents a significant *** address this challenge,this study employed the bipolar membrane electrodialysis integrated with carbon utilization technology to prepare Na_(2)CO_(3)products using simulated seawater concentrate,achieving simultaneous saline wastewater utilization,carbon storage and high-value production of Na_(2)CO_(3).The effects of various factors,including concentration of simulated seawater concentrate,current density,CO_(2)aeration rate,and circulating flow rate of alkali chamber,on the quality of Na_(2)CO_(3)product,carbon sequestration rate,and energy consumption were *** the optimal condition,the CO_(3)^(2-)concentration in the alkaline chamber reached a maximum of 0.817 mol/L with 98 mol%*** resulting carbon fixation rate was 70.50%,with energy consumption for carbon sequestration and product production of 5.7 k Whr/m^(3)CO_(2)and1237.8 k Whr/ton Na_(2)CO_(3),*** coupling design provides a triple-win outcome promoting waste reduction and efficient utilization of resources.

关键词： Bipolar membrane electrodialysis(BMED) Carbon capture Utilization and storage(CCUS) Seawater concentrate Sodium carbonate

Producing Regenerated Gratings in Hydrogen-Loaded Single Mode Fiber by Heat Treatment

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Photonic Sensors 2014年第2期4卷 125-127页

作者： Haihu YU Gengmin li xiaofu li Huiyong GUO 1National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology Wuhan430070 China Key Laboratory of Fiber Optic Sensing Technology and Information Processing (Ministry of Education) WuhanUniversity of Technology Wuhan 430070 China

The fiber Bragg grating （FBG） is a passive optical fiber component with the refractive index modulated along the fiber length and has been widely applied in fiber sensing systems. High-temperature stable fiber gratings are promising for uses at high temperatures and attract extensive attention. In this paper, FBGs were inscribed in hydrogen loaded standard single mode fibers with the 248-nm excimer laser, and regenerated gratings were obtained through heat treatment. The shift of the central wavelength of the regenerated FBG had a good linearity with temperature, and the reflectivity of the regenerated FBG could almost keep unchanged at 800 ℃.

关键词： Fiber Bragg grating regenerated grating heat treatment single mode fiber hydrogen loading

Universal transfer of full-class metal electrodes for barrier-free two-dimensional semiconductor contacts

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InfoMat 2024年第1期6卷 96-107页

作者： Mengyu Hong Xiankun Zhang Yu Geng Yunan Wang xiaofu Wei li Gao Huihui Yu Zhihong Cao Zheng Zhang Yue Zhang Academy for Advanced Interdisciplinary Science and Technology School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingthe People's Republic of China Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of EducationUniversity of Science and Technology BeijingBeijingthe People's Republic of China

Metal–semiconductor contacts are crucial components in semiconductor *** two-dimensional transition-metal dichalcogenide semiconductors can sustain transistor scaling for next-generation integrated ***,their performance is often degraded by conventional metal deposition,which results in a high barrier due to chemical disorder and Fermi-level pinning(FLP).Although,transferring electrodes can address these issues,they are limited in achieving universal transfer of full-class metals due to strong adhesion between pre-deposited metals and ***,we propose a nanobelt-assisted transfer strategy that can avoid the adhesion limitation and enables the universal transfer of over 20 different types of *** contacts obey the Schottky–Mott rule and exhibit a FLP of S=*** the electron and hole contacts show record-low Schottky barriers of 4.2 and 11.2 meV,*** a demonstration,we construct a doping-free WSe_(2) inverter with these high-performance contacts,which exhibits a static power consumption of only 58 *** strategy provides a universal method of electrode preparation for building high-performance post-Moore electronic devices.

关键词： metal electrode transfer metal–semiconductor contacts Schottky barrier two-dimensional semiconductors

Reflectivity Measurement of Weak Fiber Bragg Grating (FBG)

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1177-1179页

作者：郭会勇 ZHENG Yu TANG Jianguan li xiaofu YU Haihu WEN Hongqiao JIANG Deshcng National Engineering Laboratory of FOS Technology Wuhan University of Technology

One method based on the end-face reflection as a reference was used to measure weak grating reflectivity of 0.01%-1%. For measuring ultra-weak grating reflectivity, the grating group with an identical wavelength was used. By using anhydrous alcohol and deionized water as the reflecting medium, the single- pulse FBG reflectivity of a highly doped-Ge photosensitive fiber was calculated to be about 0.747% and 0.739%, respectively; and the single-pulse FBG reflectivity of ordinary SMF fiber was about 0.016% and 0.015%, respectively. The consistent results by the two different reflecting media showed that the end-face reflection method on the grating group was feasible.

关键词： reflectivity measurement weak FBG end-face reflection