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impacts of interactions with low-minera.ized water on permea.ility and pore beha.ior of carbonate reservoirs

Energy Geoscience 2024年第4期5卷 278-290页

作者： Dmitriy A.martyushev inna N.Ponomareva Va.iliy i.Chernykh Shadfar Davoodi Yousef Kazemzadeh Tianshou ma Department of Oil and Gas Technologies Perm National Research Polytechnic UniversityPermRussia School of Earth Sciences&Engineering Tomsk Polytechnic UniversityLenin AvenueTomskRussia Enhanced Oil Recovery(EOR)Research Center IOR/EOR Research InstituteShiraz UniversityShirazIran State Key Laboratory of Oil and Gas Reservoir Geology and Exploita.ion Southwest Petroleum UniversityChengduSichuanPR China

Laboratory filtra.ion experiments are employed to investigate effective well killing while minimizing its impacts on surrounding *** novelty of this experimental study lies in the prolonged exposure of rock samples to the killing fluid for seven days,corresponding to the average dura.ion of well workovers in the oilfields in Perm Krai,*** findings indicate that critical factors influencing the interactions between rocks and the killing fluid include the chemical composition of the killing fluid,the mineralogical composition of the carbonate rocks,reservoir pressure and temperature,and the contact *** analyses using multi-scale X-ray computed tomography,field emission scanning electron microscopy,and X-ray diffraction were conducted on samples both before and after the well killing *** experiments were performed using real samples of cores,crude oil,and the killing *** results from this study indicate that low-minera.ized water(practically fresh water)is a carbonate rock *** water causes the dissolution of rock components,the forma.ion of new calcite crystals and amoeba-like secretions,and the migra.ion of small particles(clay,quartz,and carbonates).The forma.ion of deep channels was also *** assessment reveals that the change in the pH of the killing fluid indicates that the observed mineral reactions were caused by carbonate *** combined phenomena led to a decrease in the total number of voids in the core samples,which was 25%on average,predominantly among voids measuring between 45 and 70μm in *** change in the pore distribution in the bulk of the samples resulted in decreases in porosity of 1.8%and permea.ility of 67.0%in the studied core *** results from this study indicate the unsuita.ility of low-minera.ized water as a well killing fluid in carbonate *** composition of the killing fluid should be optimized,for example,in terms of the ionic composition of water,

关键词： Fine particle Clay mineral Low-minera.ized water Geochemical dissolution Carbonate reservoir

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Spa.ial Distribution Pattern and influencing Factors of Bed-and-breakfasts(B&Bs)from the Perspective of Urban-rural Differences:A Case Study of Jiaodong Peninsula,China

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Chinese Geographical Science 2024年第4期34卷 752-763页

作者： waNG Xinyue ma Qian management College Ocean University of ChinaQingdao 266100China

There are significant differences between urban and rural bed-and-breakfasts(B&Bs)in terms of customer positioning,economic strength and spa.ial *** identifying the differences in spa.ial characteristics and influencing factors of each type,is essential for crea.ing urban and rural B&B agglomera.ion *** study used density-based spa.ial clustering of applica.ions with noise(DBSCAN)and the multi-scale geographically weighted regression(MGWR)model to explore simila.ities and differences in the spa.ial distribution patterns and influencing factors for urban and rural B&Bs on the Jiaodong Peninsula of China from 2010 to *** results showed that:1)both urban and rural B&Bs in Jiaodong Peninsula went through three stages:a slow start from 2010 to 2015,ra.id development from 2015 to 2019,and hindered development from 2019 to ***,urban B&Bs demonstrated a higher development speed and agglomera.ion intensity,lea.ing to an increa.ingly evident trend of uneven development between the two sectors.2)The clustering scale of both urban and rural B&Bs continued to expand in terms of quantity and *** B&B clusters characterized by a limited number,but a higher likelihood of transitioning from low-level to high-level *** the number of rural B&B clusters stea.ily increased over time,their clustering scale was compara.ively lower than that of urban B&Bs,and they lacked the presence of high-level clustering.3)in terms of development direction,urban B&B clusters exhibited a rela.ively stable pattern and evolved into high-level clustering centers within the main urban ***,rural B&Bs exhibited a more pronounced spa.ial diffusion effect,with clusters showing a trend of multi-center development along the coastline.4)Transport emerged as a common influencing factor for both urban and rural B&Bs,with the density of road network ha.ing the strongest explanatory power for their spa.ial *** terms of differences,popula.i

关键词： urban-rural bed-and-breakfasts(B&Bs) spa.iotemporal evolution density-based spa.ial clustering of applica.ions with noise(DBSCAN)model multi-scale geographically weighted regression(MGWR) Jiaodong Peninsula China

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Two-stage a.ing treatment to accelerate a.ing kinetics without impairing strength in B_4C/7A04Al composite

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Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN YunTao ma GuoNan ZHU ShiZe waNG Dong XiAO BoLv ma ZongYi Shi-Changxu innova.ion Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced materials Dongguan 523808China

a.ing treatments are the key process to obtain sa.isfactory strength for 7xxxAl alloys and their composites. However, tra.itional single-stage(SS) a.ing is time-consuming to reach a peak strength condition. in this study, an efficient 120℃ + 160℃ two-stage(TS) a.ing treatment was proposed on a B_4C/7A04Al composite fabricated via powder metallurgy(PM) technology, which could acquire similar peak-a.ing strength but only took about 15% of the time compared to tra.itional 120℃ SS a.ing. The evolution of precipita.ion during the TS a.ing was investigated, as well as those of the 7A04Al alloys for compa.ison. in the second stage a.ing process, the higher a.ing temperature accelerated the nuclea.ion of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short a.ing time limited the coarsening of precipitates and the broadening of precipitatefree zones. The above factors were beneficial for quickly obtaining sa.isfactory precipita.ion strengthening effects. The B_4C/7A04Al composite exhibited slower a.ing kinetics than the 7A04Al alloy in the TS a.ing. Mg elements consumption by the chemical reaction between B impurities introduced by B_4C particles and the Al matrix was considered to potentially retard the a.ing kinetics of the B_4C/7A04Al composite. Nevertheless, the precipita.ion sequence was not affected.

关键词： aluminum matrix composites a.ing treatment powder metallurgy mecha.ical properties precipita.ion

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Quantifying Contribution of Recycled Moisture to Precipita.ion in Temperate Gla.ier Region,Southeastern Tibetan Plateau,China

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Chinese Geographical Science 2024年第4期34卷 764-776页

作者： ma yanwei PU Tao SHi Xiaoyi ma Xinggang YU Hongmei College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China Na.ional Field Science Observa.ion and Research Sta.ion of Yulong Snow Mountain Cryosphere and Sustainable Development Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Recycled moisture is an important indicator of the renewal capa.ity of regional water *** to the existence of Yulong Snow Mountain,Lijiang in Yunnan Province,southeast of the Qinghai-Tibet Plateau,China.is the closest ocean gla.ier area to the equator in *** precipita.ion samples were collected from 2017 to 2018 in Lijiang to quantify the effect of sub-cloud evapora.ion and recycled moisture on precipita.ion combined with the d-excess model during monsoon and non-monsoon *** results indicated that the d-excess values of precipita.ion fluctuated between–35.6‰and 16.0‰,with an a.ithmetic mean of 3.5‰.The local meteoric water line(LMWL)wasδD=7.91δ^(18)O+2.50,with a slope slightly lower than the global meteoric water line(GMWL).Subcloud evapora.ion was higher during the non-monsoon season than during the monsoon *** tended to peak in march and was prima.ily influenced by the rela.ive *** source of the water vapour affected the proportion of recycled *** to the results of the Hybrid Single-Particle Lagrangian integrated Trajectory(HYSPLiT)model,the main sources of water vapour in Lijiang area during the monsoon period were the southwest and southeast *** the non-monsoon period,water vapour was transported by a southwesterly *** recycled moisture in Lijiang area between march and October 2017 was 10.62%.Large va.ia.ions were observed between the monsoon and non-monsoon seasons,with values of 5.48%and 25.65%,*** differences were prima.ily attributed to va.ia.ions in the advection of water *** recycled moisture has played a supplementary role in the precipita.ion of Lijiang area.

关键词： recycled moisture stable isotope precipita.ion d-excess Hybrid Single-Particle Lagrangian integrated Trajectory(HYSPLiT)model southeastern Tibetan Plateau China

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Time-lagged Effects of the Spring Atmospheric Heat Source over the Tibetan Plateau on Summer Precipita.ion in Northeast China during 1961–2020:Role of Soil Moisture

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Advances in Atmospheric Sciences 2024年第8期41卷 1527-1538页

作者： Yizhe HAN Dabang JiANG Dong Si yaoming ma Weiqiang ma institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Na.ional institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China Na.ional Observa.ion and Research Sta.ion for Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China Kathmandu Center of Research and Educa.ion Chinese Academy of SciencesBeijing 100101China China-Pa.istan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan

The spring atmospheric heat source(AHS)over the Tibetan Plateau(TP)has been suggested to affect the a.ian summer monsoon and summer precipita.ion over South ***,its influence on the summer precipita.ion in Northeast China(NEC)remains *** connection between spring TP AHS and subsequent summer precipita.ion over NEC from 1961 to 2020 is analyzed in this *** illustrate that stronger spring TP AHS can enhance subsequent summer NEC precipita.ion,and higher soil moisture in the Yellow River Valley-North China region(YRVNC)acts as a *** spring,the strong TP AHS could strengthen the transporta.ion of water vapor to East China and lead to excessive rainfall in the ***,soil moisture increases,which regulates local thermal conditions by decrea.ing local surface skin temperature and sensible *** to the memory of soil moisture,the lower spring sensible heat over the YRVNC can last until mid-summer,decrease the land–sea thermal contrast,and weaken the southerly winds over the East a.ia–western Pa.ific region and convective activities over the South China Sea and tropical western *** modulates the East a.ia–Pa.ific teleconnection pattern,which leads to a cyclonic anomaly and excessive summer precipita.ion over NEC.

关键词： Tibetan Plateau atmospheric heat source Northeast China summer precipita.ion soil moisture

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Land-popula.ion-industry based village evolution and its influencing factors in the upper Tuojiang River

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Journal of Mountain Science 2024年第8期21卷 2790-2809页

作者： ZHAN Yunjun Ji Yuxin HUANG Jiejun ma Changying ma Chuanqi School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

With economic development and urba.iza.ion in China,the rural settlements have experienced great *** explore the evolution process of rural settlements in terms of land,popula.ion and industry can reveal the development law of rural spa.ial distribution,popula.ion structure and industrial economy in different stages and *** the development status and evolution characteristics of villages in the upper Tuojiang River ba.in in Southwest China.in the past 20 years are of significant *** upper Tuojiang River ba.in includes the main types of terrain found in the Southwest region:mountainous,plains,and hills,exhibiting a certain typica.ity of geographical *** study took towns and townships at the town-level scale as the ba.ic unit of research,and constructed an evalua.ion system for village evolution based on'land,popula.ion,and industry'.it employed Criteria.importance Through inter-Criteria Correla.ion(CRiTiC)analysis to exa.ine the characteristics of village evolution in the area from 2000 to 2020,and used geographic detector analysis to identify the lea.ing factors affecting village *** results show that:(1)From 2000 to 2010,villages in the upper Tuojiang River ba.in experienced significant changes,and the pace of these transforma.ions slowed from 2010 to 2020.(2)From a comprehensive perspective,from 2000 to 2020,villages in hilly areas show a decline,while villages in plain areas near the city center show a positive urba.iza.ion development.(3)Road accessibility and distance from the city center are the main factors that explain the spa.ial differentia.ion of village evolution degree in the study *** study elucidates the spa.iotemporal evolution characteristics of villages in the upper Tuojiang River ba.in and identifies the primary factors contributing to their changes,which will provide a reference for investiga.ing the development of rural areas in different terrains of Southwest China.

关键词： Village evolution Land Popula.ion industry Geographic detector

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Effects of gravel on the water absorption characteristics and hydraulic parameters of stony soil

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Journal of a.id Land 2024年第7期16卷 895-909页

作者： ma yan waNG Youqi ma Chengfeng YUAN Cheng BAi Yiru Breeding Base for State Key Laboratory of Land Degrada.ion and Ecological Restora.ion in Northwest China Ningxia UniversityYinchuan 750021China School of Geography and Planning Ningxia UniversityYinchuan 750021China School of Ecology and Environment Ningxia UniversityYinchuan 750021China

The eastern foothills of the Helan Mountains in China are a typical mountainous region of soil and gravel,where gravel could affect the water movement process in the *** study focused on the effects of different gravel contents on the water absorption characteristics and hydraulic parameters of stony *** stony soil samples were collected from the eastern foothills of the Helan Mountains in April 2023 and used as the experimental materials to conduct a one-dimensional horizontal soil column absorption *** experimental groups with gravel contents of 0%,10%,20%,30%,40%,and 50%were established to determine the saturated hydraulic conductivity(K_(s)),saturated water content(θ_(s)),initial water content(θ_(i)),and retention water content(θ_(r)),and explore the changes in the wetting front depth and cumula.ive absorption volume during the absorption *** Philip model was used to fit the soil absorption process and determine the soil water absorption *** the length of the characteristic wetting front depth,shape coefficient,empirical parameter,inverse intake suction and soil water suction were derived from the van Genuchten ***,the hydraulic parameters mentioned above were used to fit the soil water characteristic curves,unsaturated hydraulic conductivity(K_(θ))and specific water capa.ity(C(h)).The results showed that the wetting front depth and cumula.ive absorption volume of each treatment gradually decreased with increa.ing gravel *** with control check treatment with gravel content of 0%,soil water absorption rates in the treatments with gravel contents of 10%,20%,30%,40%,and 50%decreased by 11.47%,17.97%,25.24%,29.83%,and 42.45%,*** the gravel content increased,inverse intake suction gradually increased,and shape coefficient,K_(s),θ_(s),andθ_(r)gradually *** the same soil water content,soil water suction and K_(θ)gradually decreased with increa.ing gravel *** the same soil water s

关键词： stony soil gravel content water absorption characteristics hydraulic parameters one-dimensional horizontal soil column absorption experiment van Genuchten model eastern foothills of Helan Mountains

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Effect of Cryogenic Treatment on Microstructure and Tribological Property Evolution of Electron Beam Melted Ti6Al4V

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Journal of Wuhan University of Technology(materials Science) 2024年第4期39卷 1010-1017页

作者：黄西娜 ma Xiaowen XU Tianyi School of Mecha.ical and Electrical Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Engineering and Technology China University of GeosciencesBeijing 100083China

Cryogenic treatment was used to improve the tribological properties of Ti6Al4V artificial hip joint *** treatment at-196℃with different holding time were carried out on Ti6Al4V specimens fabricated using electron beam melting(EBM),and their microstructure and tribological properties evolution were systema.ically analyzed by scanning electron microscopy(SEM),vickers hardness,and wear *** experimental results show that the as-fabricated specimen consists of lamellarαphase andβcolumnar ***,the thickness of lamellarαphase decreased after cryogenic *** addition,it can be found that the fineαphase was precipitated and dispersed between the lamellarαphase with the holding time *** hardness shows a trend of first increa.ing and then *** wear rate of the specimen cryogenic treated for 24 h is the minimum and the average friction coefficient is 0.50,which is reduced by 14.61%compared with the *** wear mecha.ism of the as-fabricated specimen is severe exfolia.ion,adhesive,abra.ive,and slight fa.igue ***,the specimen cryogenic treated for 24 h shows slight adhesive and abra.ive *** can be concluded that it is fea.ibility of utilizing cryogenic treatment to reduce the wear of EBMed Ti6Al4V.

关键词： electron beam melting(EBM) cryogenic treatment microstructure vickers hardness tribological property

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Bioinspired nanomaterials for the treatment of bacterial infections

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Nano Research 2024年第2期17卷 691-714页

作者： Xiaojing ma Wenjing Tang Rong yang Robert F.Smith School of Chemical&Biomolecular Engineering Cornell UniversityIthacaNY 14853USA

infectious diseases pose a serious threat to global *** immuniza.ions can control most viral infections,bacterial infections,particularly those caused by drug-resistant strains,continue to cause high rates of illness and ***,the crea.ion of new antibiotics has come to a grinding halt in the last ten *** response to this crisis,nanotechnology has emerged as a hopeful solution to tackle drug resistance and enhance treatment results.A large va.iety of biomimetic nanomaterials,termed nanozymes,have demonstrated strong antimicrobial *** the inherent toxicity of nanomaterials is a concern,recent studies have harnessed the stimuli-responsiveness of nanomaterials to enable local and/or targeted delivery to reduce the treatment side ***,the physicochemical versa.ility of nanomaterials affords many degrees of freedom that enable ra.ional design of smart or autonomous therapeutics,which cannot be achieved using conventional *** design straddles the fields of catalysis,nanoscience,microbiology,and transla.ional *** provide an overview of this interdisciplinary landscape,this review is orga.ized based on composition into lipid,metal,metal oxide,and non-metallic *** as a delivery vehicle enhance bioavaila.ility and reduce ***-and metal oxide-based nanomaterials inhibit bacterial growth by mimicking natural enzyma.ic activities such as peroxidase(POD)and ***,carbon-,polymer-,and cell membrane-based nanomaterials are combined into a discussion on non-metallic *** the end of this review,potentially fruitful directions for future bioinspired nanomaterials in infectious disease treatment are included.

关键词： bioinspired nanomaterial bacteria infectious disease antimicrobial liposome nanozyme

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Access to High-Molecular-Weight Polyethylenes through High Temperature Ethylene Polymeriza.ion Catalysed by Ethylene-Bridged ansa-(3-R-Cyclopenta.ienyl)(Fluorenyl) Zirconocene Complexes

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Chinese Journal of Polymer Science 2024年第1期42卷 42-51,I0007页

作者： Bo Li Haiyan ma Jiling Huang Shanghai Key Laboratory of Functional materials Chemistry and Laboratory of Organometallic Chemistry School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

A series of C1-symmetric ethylene-bridged ansa-(3-R-cyclopenta.ienyl)(fluorenyl) metallocene complexes(Zr: 1-5;Hf: 6) have been synthesized, characterized and investigated as catalyst precursors for the high temperature ethylene polymeriza.ion. Using methylaluminoxane(maO) as the cocatalyst, zirconium complexes 1-5 bea.ing a bulky substituent on the 3-position of the cyclopendienyl ring showed high catalytic activities up to 1.48×10^(7) g PE·mol_(Zr)^(-1)·h^(-1) toward the polymeriza.ion of ethylene and afforded polyethylenes with high molecular weights(1.49×10^(5)-6.31×10^(5) g/mol), meanwhile exhibting great thermal sta.ility at high temperatures up to 120 ℃ together with a long catalytic life time up to 2 h. By adopting low Al/Zr ra.ios, such as 125, polyethylenes with ultra high molecular weights up to 2.86×106 g/mol were obtained. it is worthy of noting that zirconium complexes 1-4 bea.ing a substituent with an aryl pendant showed temperature-dependent activities, which increased ra.idly with the increase of polymeriza.ion temperature, thus weak interaction of the pendent aryl group with the ca.ionic active center is proposed to account for the very low activities displayed at low temperatures. in contrast to zirconocene complexes 1-5, hafnocene complex 6 only displayed very low catalytic activities toward the polymeriza.ion of ethylene and afforded polyethylenes with molecular weights ten times smaller than those obtained by zirconocene complexes 1-5. Zirconocene complexes 1-5 were also able to catalyse the polymeriza.ion of propylene at high temperatures, but only afforded waxes with low molecular weights.

关键词： ansa-Metallocene Ethylene Propylene Polymeriza.ion High temperature

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