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缓交联高强度凝胶的制备和性能研究

石油化工 2024年第6期53卷 871-877页

作者：代磊阳牟媚徐国瑞张晓封郐婧文中海石油(中国)有限公司天津分公司天津300459 海洋油气高效开发全国重点实验室北京102209 天津市海洋石油难动用储量开采重点实验室天津300459 中海油田服务股份有限公司天津300459

为平衡注入性与封堵性间的矛盾,需选择初始黏度低、成胶时间长、成胶后强度高的凝胶堵剂,鉴于铬冻胶成胶时间调控难度大、酚醛交联剂毒性大等问题,采用聚乙烯亚胺为交联剂、聚酰胺-胺为主剂、硫脲为除氧剂、硅溶胶为增强剂制备凝胶。实... 详细信息

为平衡注入性与封堵性间的矛盾,需选择初始黏度低、成胶时间长、成胶后强度高的凝胶堵剂,鉴于铬冻胶成胶时间调控难度大、酚醛交联剂毒性大等问题,采用聚乙烯亚胺为交联剂、聚酰胺-胺为主剂、硫脲为除氧剂、硅溶胶为增强剂制备凝胶。实验结果表明,该凝胶可在70℃、总矿化度为26205 mg/L的储层条件下使用,成胶时间为4 d,凝胶强度可达到H级,封堵率可达90%以上,对实现深度堵水有一定的指导意义。

关键词：凝胶聚酰胺-胺耐盐低黏

基于惠更斯等效原理的高速高密度PCB分级建模方法

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电子学报 2024年第4期52卷 1118-1131页

作者：刘元安高兆栋孙胜苏明郑少勇吴帆郭星月穆冬梅北京邮电大学电子工程学院安全生产智能监控北京市重点实验室北京100876 电子科技大学电子科学与工程学院四川成都611731 中山大学电子与信息工程学院(微电子学院) 广东广州510006

当带宽达到20 GHz以上时(波长从15 mm到无穷小),高速高密度电子系统的内部电路电磁环境变得十分复杂,越来越难以建模和分析预测,进一步当带宽达到40 GHz以上时,电路电磁环境问题将变得更加尖锐.为在设计阶段能够对电磁作用过程、作用效... 详细信息

当带宽达到20 GHz以上时(波长从15 mm到无穷小),高速高密度电子系统的内部电路电磁环境变得十分复杂,越来越难以建模和分析预测,进一步当带宽达到40 GHz以上时,电路电磁环境问题将变得更加尖锐.为在设计阶段能够对电磁作用过程、作用效应进行预测评估及控制,需要精确的建模方法和针对大尺度问题的快速计算技术,尤其是超大带宽超高速混合电路和集成电路.本文提出了基于混合电路环境电磁计算基础理论的跨尺度处理技术,通过惠更斯等效原理和电磁奇异性几何结构的电磁收敛降速机理的利用,解决了多维交叉多尺度电路电磁环境场路融合的高效率高精度建模技术挑战;利用惠更斯等效原理和基尔霍夫积分方程,在区域边界面上定义了惠更斯端口,提出了对于任意复杂印制电路板(Printed Circuit Board,PCB)同时垂直方向和水平方向区域分解的一般方法,实现了任意PCB结构的分级分类处理和模块化封装,提高了高速高密度电子系统分析的灵活度;提出了基于几何结构电磁学多重本地本征展开的技术途径,发展了基于模式和区域分解分割的快速并行处理技术,通过电磁锐变区域本征描述及场分布的本征基函数表征,实现了高精度和高计算速度兼得,减少了复杂电子系统的计算时间和设计时间.统计数据表明,本文提出的方法在0~40 GHz大带宽频率范围内频偏误差为3.7%、幅度偏差为±3 dB.本文提出的PCB分级建模分析方法可以应用于高端电子通信系统设计,提升我国宽带高速数模系统的高效电路设计和环境电磁调控能力,缩短产品研发周期.

关键词：等效原理本征模式展开电路建模区域分解信号完整性集成电路芯片封装

Design and flow field analysis for visualization experiment facility of pebble bed based on molten salt reactor

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Nuclear Science and Techniques 2019年第3期30卷 139-148页

作者： mu-Dan mei Xing-Wei Chen Sheng-De Sun Rui Yan Yang Zou Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Molten salt pebble bed reactor is one of the sixth-generation Ⅳ reactor types. To investigate the mechanical behavior of the fuel pebbles in the core, a visualization experiment facility of pebble bed(VEFPB) is designed. To obtain a uniform flow field of the core and analyze the influence of the flow field on the structure of the pebble bed, computational fluid dynamics software Fluent is used to simulate the flow field distribution of the core of VEFPB. The simulation results show that the disturbance at the bottom of the pebble bed is proportional to the flow velocity of the inlet pipe, and the flow velocity close to the inlet side is more significant than that in other parts; the design of the cylinder bottom plate with holes of different sizes can effectively reduce the flow velocity and the disturbance at the bottom of the pebble bed. In addition,according to the velocity contours of the core of VEFPB, it is observed that the flow field distribution of the core is considerably uniform except at the bottom of the pebble bed. This ensures the stability of the pebble bed and verifies the rationality of the design of VEFPB. This study provides the technical support and reference for the flow field analysis of the core of molten salt pebble bed reactor.

关键词： Thorium molten salt reactor (TMSR) Particle image velocimetry (PIV) Computational fluid dynamics (CFD) Experiment facility

Optical Properties of Self-Organized PbS Quantum Dot Superlattices

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Chinese Physics Letters 2000年第10期17卷 755-756页

作者： YE Chang-Hui YAO Lian-Zeng mu Ji-mei SHI Gang ZHANG Li-De Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026 Institute of Solid State Physics Chinese Academy of SciencesHefei 230031

Self-organization of PbS into quantum dot superlattices has been demonstrated for the first time, and hexaplanar colloidal crystals 1 - 10 μm in size made from PbS quantum dots 3 - 6 nm in diameter are revealed in transmissionelectron microscope micrographs, and the inner structures of the superlattices can be seen by a high resolution transmission electron microscopy. The optical absorption and photoluminescence spectra have been recorded. The ordering of the superlattices is crucial for the understanding of the fundamental properties of quantum-dot arrays, as well as for their optimal utilization in optical and electronic applications.

关键词： quantum planar inner

MIL-125(Ti/Cu)有机框架的制备及其光催化还原CO_(2)的性能

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黑龙江科技大学学报 2024年第4期34卷 557-563,577页

作者：宋微娜穆美林俊康邓忠员刘亚敏黑龙江科技大学环境与化工学院哈尔滨150022

为改善环境污染、降低碳排放和缓解温室效应,设计合成了系列MIL-125(Ti/Cu)双金属有机框架催化剂,通过XRD、SEM、N_(2)吸附/脱附、FT-IR和TGA对样品进行了结构分析,研究了复合材料光催化还原CO_(2)性质。结果表明:助催化剂Cu掺杂可以获... 详细信息

为改善环境污染、降低碳排放和缓解温室效应,设计合成了系列MIL-125(Ti/Cu)双金属有机框架催化剂,通过XRD、SEM、N_(2)吸附/脱附、FT-IR和TGA对样品进行了结构分析,研究了复合材料光催化还原CO_(2)性质。结果表明:助催化剂Cu掺杂可以获得结构稳定的Ti/Cu双金属MIL-125型金属有机框架材料,样品具有MOFs材料典型的大比表面积和多孔结构;Cu掺杂使复合材料分子吸收光谱向可见光区移动,增加了样品的电子转移效率;0.5-MCu样品光催化还原CO_(2)进行5 h,CO和CH 4的产量比MIL-125(Ti)增加一倍,分别为51.2和58.7μmol/g,光催化氧化还原过程中·OH和·O^(-)_(2)是主要的活性物种。

关键词： Ti/Cu双金属 MIL-125 金属有机框架光催化还原CO_(2)

Changes in net ecosystem exchange of CO_(2)in Arctic and their relationships with climate change during 2002-2017

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Advances in Climate Change Research 2021年第4期12卷 475-481页

作者： LI Zhi-Long mu Cui-Cui CHEN Xu WANG Xing-Yu DONG Wen-Wen JIA Lin mu mei Irina STRELETSKAYA Valery GREBENETS Sergey SOKRATOV Alexander KIZYAKOV WU Xiao-Dong Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou730000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China Cryosphere Research Station on the Qinghai-Tibetan Plateau State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-Environment and ResourceChinese Academy of SciencesLanzhou730000China University Cooperation of Polar Research Beijing100875China Geographical Faculty Lomonosov Moscow State UniversityMoscow119991Russia

Arctic wanning leads to permafrost degradation,which can increase ecosystem respiration and release more greenhouse gas into the ***,climate warming also promotes the plant growth and increases carbon ***,it is largely unknown about the carbon budget and their responses to climate change in the Arctic *** this study,to investigate the seasonal and annual net ecosystem carbon exchange(NEE),we collected 71 observation stations for net ecosystem exchange(NEE)of CO_(2)in the high latitude permafrost regions during *** results showed that the annual NEE was-8.2±4.1 g CO_(2)m^(-2)d^(-1)for forest,-3.3±2.6 g CO_(2)m^(-2)d^(-1)for shrub,-4.8±4.1 g CO_(2)m^(-2)d^(-1)for grassland,-3.6±3.0 g CO_(2)m^(-2)d^(-1)for wetland and 0.02±0.62 g CO_(2)m^(-2)d^(-1)for tundra,*** 2002 to 2017,the CO_(2)emissions of grassland(carbon source)showed a decreasing trend,and the CO_(2)assimilation of shrub and forest(carbon sink)has been *** wetland and tundra are shifting from carbon sources to *** were great variations in temperature sen-sitivities(Q10)of NEE in different seasons,with larger values in winter and lower values in *** findings indicate that the Arctic terrestrial ecosystem presently acts as a carbon sink,while there is a possibility that future warming,especially the warming in winter,may decrease the carbon sink of the Arctic terrestrial ecosystem.

关键词： Arctic Climate change Permafrost Carbon flux Ecosystem Eddy covariance

Hydrangea flower-like nanostructure of dysprosium-doped Fe-MOF for highly efficient oxygen evolution reaction

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Rare Metals 2022年第3期41卷 844-850页

作者： Yan Ma Guo-mei mu Yu-Jie Miao Dun-Min Lin Cheng-Gang Xu Feng-Yu Xie Wen Zeng College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China College of Materials Science and Engineering Chongqing UniversityChongqing 401331China

Developing catalysts with high intrinsic activity toward oxygen evolution reaction (OER) has paramount importance to meet the ever-increasing quest for sustainability demands for green energy solutions but ***, a one-step synthesized hydrangea flower-like metal-organic framework (MOF) by dysprosium (Dy)-doped Fe-MOF is reported (Dy_(0.05)Fe-MOF/NF).

关键词： dysprosium reaction intrinsic

Advances and key focus areas in gastric cancer immunotherapy:A comprehensive scientometric and clinical trial review(1999-2023)

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World Journal of Gastroenterology 2023年第40期29卷 5593-5617页

作者： Yao-Nan Li Bin Xie Ying Zhang Ming-Hua He Yang Xing Dong-mei mu Hong Wang Rui Guo Clinical Laboratory The First Hospital of Jilin UniversityChangchun 130012Jilin ProvinceChina Cancer Center The First Hospital of Jilin UniversityChangchun 130012Jilin ProvinceChina College of Computer Science and Technology Jilin UniversityChangchun 130012Jilin ProvinceChina Division of Clinical Research The First Hospital of Jilin UniversityChangchun 130012Jilin ProvinceChina

BACKGROUND Gastric cancer(GC)is the sixth most common cancer and third leading cause of cancer-related deaths *** treatments mainly rely on surgery-and chemotherapy-based systemic;however,the prognosis remains poor for advanced *** studies have suggested that immunotherapy has significant potential in cancer therapy;thus,GC immunotherapy may improve quality of life and survival for patients with this *** To provide a comprehensive overview of the knowledge structure and research hotspots of GC *** We conducted a bibliometric analysis of publications on immunotherapy related to GC in the Web of Science Core Collection *** analyzed 2013 publications from 1999 to February 1,2023,using the VOSviewer and CiteSpace *** assessed publication and citation distributions using the WoS platform and explored research countries,institutions,journals,authors,references,and keywords(co-occurrence,timeline view,and burst analysis).In addition,we examined 228 trials on immunotherapy,137 on adoptive cell therapy,274 on immune checkpoint inhibitors(ICIs),and 23 on vaccines from *** and the International Clinical Trials Registry *** Impact Index Per Article for the top ten high-cited papers collected from Reference Citation Analysis(RCA)are *** Our bibliometric analysis revealed that the study of immunotherapy in GC has developed rapidly in recent *** accounted for almost half the publications,followed by the United *** number of publications in recent years has been growing continuously,and most institutions and authors with the most publications are from *** main keywords or clusters identified were“tumor microenvironment”,“adoptive immunotherapy”,“dendritic therapy”,and“microsatellite instability”.CONCLUSION Our analysis of 2013 publications indicated that immunotherapy for GC has led to several new developments in recent *** progress has been m

关键词： Immunotherapy Gastric cancer Clinical trials Scientometric analysis Visualization

CAEFusion: A New Convolutional Autoencoder-Based Infrared and Visible Light Image Fusion Algorithm

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Computers, Materials & Continua 2024年第8期80卷 2857-2872页

作者： Chun-Ming Wu mei-Ling Ren Jin Lei Zi-mu Jiang Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of EducationSchool of Electrical EngineeringNortheast Electric Power UniversityJilin132012China School of Electrical Engineering Northeast Electric Power UniversityJilin132012China School of Electronic Information Engineering Bozhou UniversityBozhou236800China

To address the issues of incomplete information,blurred details,loss of details,and insufficient contrast in infrared and visible image fusion,an image fusion algorithm based on a convolutional autoencoder is *** region attention module is meant to extract the background feature map based on the distinct properties of the background feature map and the detail feature map.A multi-scale convolution attention module is suggested to enhance the communication of feature *** the same time,the feature transformation module is introduced to learn more robust feature representations,aiming to preserve the integrity of image *** study uses three available datasets from TNO,FLIR,and NIR to perform thorough quantitative and qualitative trials with five additional *** methods are assessed based on four indicators:information entropy(EN),standard deviation(SD),spatial frequency(SF),and average gradient(AG).Object detection experiments were done on the M3FD dataset to further verify the algorithm’s performance in comparison with five other *** algorithm’s accuracy was evaluated using the mean average precision at a threshold of 0.5(mAP@0.5)*** experimental findings show that CAEFusion performs well in subjective visual and objective evaluation criteria and has promising potential in downstream object detection tasks.

关键词： Image fusion deep learning auto-encoder(AE) infrared visible light