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Ferroelectric perovskite PbTiO_(3)for advanced photocatalysis

Rare Metals 2024年第9期43卷 4038-4055页

作者： Shuang Zhao shi-shi Shen Lu Han Bo-Chao Tian na li.Wei Chen Xi-Bao li School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Department of Chemistry National University of SingaporeSingapore 117543Singapore

The ferroelectric semiconductor material PbTiO_(3)exhibits remarkable spontaneous polarization and photoelectric properties,positioning it as a promising polar *** internal electric field of ferroelectrics can separate photocarriers and enhance the catalytic performance of ***,when combined with other semiconductors,PbTiO_(3)contributes to the construction of a depolarization field,extending the catalytic appli.ations of PbTiO_(3)***_(3)exhibits optical absorption,semiconductor,and piezoelectric *** piezoelectric polarization field enhances charge separation,modulates band structure,surface charge conduction,and heterojunction interface charge conduction,thereby ampli.ying photocatalytic *** paper begins by examining the structure,properties,and preparation methods of PbTiO_(3).Subsequently,it delves into the optimization of PbTiO_(3)'s structure and performance,exploring appli.ations in photocatalysis as a ferroelectric *** is placed on the detailed discussion of surface modification,heterostructure formation,and ferroelectric polarization of PbTiO_(3)*** aspects are thoroughly explored for their role in regulating activity and optimizing the performance of photocatalysis and photopiezoelectric *** conclusion,the paper addresses the current research status of PbTiO_(3)ferroelectric materials and highli.hts the challenges that li. *** intention is to provide valuable references for the ongoing research in PbTiO_(3)ferroelectric materials.

关键词： PbTiO_(3) Ferroelectric polarization Photocatalysis Piezoelectric catalysis Polarization

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On the Appli.ation of Mixed Models of Probabili.y and Convex Set for Time-Variant Reli.bili.y Analysis

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Computer Modeli.g in Engineering & Sciences 2024年第5期139卷 1981-1999页

作者： Fangyi li.Dachang Zhu Huimin shi Center for Research on Leading Technology of Special Equipment School of Mechanical and Electric EngineeringGuangzhou UniversityGuangzhou510006China

in time-variant reli.bili.y problems,there are a lot of uncertain variables from different ***,it is important to consider these uncertainties in *** addition,time-variant reli.bili.y problems typically involve a complexmultilevel nested optimization problem,which can result in an enormous amount of *** this end,this paper studies the time-variant reli.bili.y evaluation of structures with stochastic and bounded uncertainties using a mixed probabili.y and convex set *** this method,the stochastic process of a li.it-state function with mixed uncertain parameters is first discretized and then converted into a timeindependent reli.bili.y ***,to solve the double nested optimization problem in hybrid reli.bili.y calculation,an efficient iterative scheme is designed in standard uncertainty space to determine the most probable point(MPP).The li.it state function is li.earized at these points,and an innovative random variable is defined to solve the equivalent static reli.bili.y analysis *** effectiveness of the proposed method is verified by two benchmark numerical examples and a practical engineering problem.

关键词： Mixed uncertainty probabili.y model convex model time-variant reli.bili.y analysis

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A Rendezvous Mission to the Second Earth Trojan Asteroid 2020 XL_5 with Low-Thrust Multi-Gravity Assist Techniques

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Research in Astronomy and Astrophysics 2024年第1期24卷 245-264页

作者： shi-Hai Yang Bo Xu Xin li School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China

As the second of Earth's Trojan asteroids, 2020 XL_(5) is worthy of rendezvous and even sample return missions in many aspects. in this paper, a rendezvous mission to Earth's second Trojan asteroid 2020 XL_(5) is ***, due to its high incli.ation and large eccentricity, direct impulsive transfer requires large amounts of fuel consumption. To address this challenge, we explore the benefits of electric propulsion and multi-gravity assist techniques for interplanetary missions. These two techniques are integrated in this mission design. The design of a low-thrust gravity-assist(LTGA) trajectory in multi-body dynamics is thoroughly investigated,which is a complex process. A comprehensive framework including three steps is presented here for optimization of LTGA trajectories in multi-body dynamics. The rendezvous mission to 2020 XL_(5) is designed with this three-step approach. The most effective transfer sequence among the outcomes involves Earth–Venus–Earth–Venus-2020 XL_(5). numerical results indicate that the combination of electric propulsion and multi-gravity assists can greatly reduce the fuel consumption, with fuel consumption of 9.03%, making it a highly favorable choice for this rendezvous mission.

关键词： minor planets asteroids:general celestial mechanics Planetary Systems

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Solvent extraction of scandium from leaching solution of red mud roasted with ammonium sulfate using D2EHPA/TBP

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Journal of Rare Earths 2024年第10期42卷 1943-1949页

作者： Fucheng li.Xinsheng li.Lei shi Xiang li.Duoqiang li.ng Yuezhou Wei Toyohisa Fujita School of Resources Environment and MaterialsGuangxi University State Key Laboratory of Featured Metal Materials and li.e-cycle Safety for Composite Structures Guangxi University School of nuclear Science and Technology University of South China

Red mud is an important secondary resource for scandium *** red mud leaching solution containing scandium in this study was derived from environmentally friendly ammonium sulfate roasting and water leaching process.A synergistic extraction with a mixture of di（2-ethylhexyl） phosphate acid（D2EHPA） and tributyl phosphate（TBP） for recovery of scandium from red mud leaching solution is *** effects of D2EHPA concentration,H2SO4concentration,rare earth elements,dosage of TBP,phase ratio（A/O）,contact time and H2O2concentration on scandium extraction were *** results show that more than 99% scandium is extracted under the optimal conditions while Fe,Al,Ti,Ca and rare earth elements（Ce,Y,La,nd,Er,etc.） are hardly *** stripping efficiency of Sc reaches above 92.37% under the optimal stripping conditions of 5 mol/L naOH with an A/O of 1 at 90℃ for 30 *** proposed technology could provide an effective method for extraction of scandium from red mud leaching solution.

关键词： D2EHPA/TBP Rare earths Red mud leaching solution Scandium Solvent extraction

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Characterization of cerebrovascular changes in Alzheimer's disease mice by photoacoustic imaging

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Journal of innovative Optical Health Sciences 2024年第6期17卷 29-40页

作者： Xi li.Zhongyang Zhang Hua shi Feifan Zhou Key Laboratory of Biomedical Engineering of Hainan Province School of Biomedical Engineering Hainan University Sanya 572025P.R.China

The cerebral vasculature plays a significant role in the development of Alzheimer's disease(AD),however,the specific association between them remains *** this paper,based on the benefits of photoacoustic imaging(PAi),including label-free,high-resolution,in vivo imaging of vessels,we investigated the structural changes of cerebral vascular in wild-type(WT)mice and AD mice at different ages,analyzed the characteristics of the vascular in different brain regions,and correlated vascular characteristics with cognitive *** results showed that vascular density and vascular branching index in the cortical and frontal regions of both WT and AD mice decreased with ***,vascular lacunarity increased with age,and the changes in vascular structure were more pronounced in AD *** trend of vascular dysfunction ali.ns with the worsening cognitive dysfunction as the disease ***,we utili.ed in vivo PAi to analyze the changes in vascular structure during the progression of AD,elucidating the spatial and temporal correlation with cognitive impairment,which will provide more intuitive data for the study of the correlation between cerebrovascular and the development of AD.

关键词： Photoacoustic imaging Alzheimer's disease cerebrovascular vascular network cognitive impairment.

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influence of rare earth oxides on microstructure and mechanical properties of nickel-based superalloys fabricated by high energy beam processing:A review

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Journal of Rare Earths 2024年第9期42卷 1629-1645,I0001页

作者： li.njie Bi Hua Yan Peilei Zhang Haichuan shi Zhiyuan li.Ruidi li School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai201620China College of Agricultural Science and Engineering Hohai UniversityNanjing211100China Department of Mechanics and Maritime Science Chalmers University of TechnologyGothenburSE41296Sweden State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

in this paper,the effects of rare earth oxides on the micro structure and mechanical properties of nickelbased superalloys prepared by high-energy beam processing technology were critically *** focus is on the optimal amount of rare earth oxides that can produce ideal *** attention was paid to their main strengthening mechanisms,including soli. solution strengthening mainly in the form of soli. solution dissolved in the nickel-based alloy and improving the microstructure of the alloy by grain refinement or fine grain strengthening produced by homogenizing the distribution phase.Y_(2)O_(3),La_(2)O_(3) and CeO_(2) rare earth oxides can also improve the fluidity of the alloy molten pool and reduce the segregation of alloying *** advantages can significantly improve the mechanical properties of the ***,this paper outli.es the future research directions of rare earth oxides,aiming to expand their appli.ation potential.

关键词： Rare earths High energy beam nickel-based superalloys Microstructure Mechanical properties

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Effect of droplet characteristics on li.uid-phase distribution in spray zone of internal mixing air-mist nozzle

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China Foundry 2024年第2期21卷 185-196页

作者： Wei-li.Wu Chang-gui Cheng Yang li.shi-fa Wei De-li.Chen The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Hubei Provincial Key Laboratory for new Processes of ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081China Technology Center Fushun Special Steel Co.Ltd.Fushun 113001LiaoningChina

in continuous casting production,droplet characteristics are important parameters for evaluating the nozzle atomization quali.y,and have a significant impact on the secondary cooli.g effect and the slab *** order to study the behavior of atomized droplets after reaching the slab surface and to optimize the spray cooli.g effect,the influence of droplet diameter and droplet velocity on the migration behavior of droplets in the secondary cooli.g zone was analyzed by FLUEnT *** show that the droplets in the spray zone and on the slab surface are mainly concentrated in the center,thus,the li.uid volume fraction in the center is higher than that of either *** the droplet diameter increases,the region of high li.uid volume fraction on the slab surface becomes wider,and the li.uid phase distribution in the slab width direction becomes *** increasing the droplet velocity at the nozzle exit has li.tle effect on droplet diffusion in the spray zone,the distribution becomes more uneven due to more li.uid reaches the slab surface per unit time.A prediction formula of the maximum water flow rate on the slab surface for specific droplet characteristics was proposed based on dimensionless analysis and vali.ated by simulated data.A nozzle spacing of 210 mm was recommended under the working conditions in this study,which ensures effective coverage of the spray water over the slab surface and enhances the distribution uniformity of water flow rate in the transverse direction.

关键词： continuous casting secondary cooli.g zone internal mixing air-mist nozzle droplet characteristics li.uid phase distribution water flow rate

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Development of a Mengla virus minigenome and comparison of its polymerase complexes with those of other filoviruses

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Virologica Sinica 2024年第3期39卷 459-468页

作者： shi-Zhe Xie Ke Yao Bei li.Cheng Peng Xing-Lou Yang Zheng-li.shi State Laboratory of Virology Wuhan Institute of VirologyChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Yunnan Key Laboratory of Biodiversity information Kunming Institute of ZoologyChinese Academy of SciencesKunming650201China Hubei Jiangxia Laboratory Wuhan430200China

Ebola virus(EBOV)and Marburg virus(MARV),members of the Filoviridae family,are highly pathogenic and can cause hemorrhagic fevers,significantly impacting human *** are considered reservoirs of these viruses because related filoviruses have been discovered in ***,due to the requirement for maximum containment laboratories when studying infectious viruses,the characterization of bat filoviruses often reli.s on pseudoviruses and minigenome *** this study,we used RACE technology to sequence the 30-leader and 50-trailer of Mengla virus(MLAV)and constructed a *** to MARV,the transcription activities of the MLAV minigenome are independent of *** further assessed the effects of polymorphisms at the 50 end on MLAV minigenome activity and identified certain mutations that decrease minigenome reporter efficiency,probably due to alterations in the RnA secondary *** reporter activity upon recombination of the 30-leaders and 50-trailers of MLAV,MARV,and EBOV with those of the homologous or heterologous minigenomes was compared and it was found that the polymerase complex and leader and trailer sequences exhibit intrinsic ***,we investigated whether the polymerase complex proteins from EBOV and MARV support MLAV minigenome RnA synthesis and found that the homologous system is more efficient than the heterologous *** efficiently inhibited MLAV as well as EBOV *** summary,this study provides new information on bat filoviruses and the minigenome will be a useful tool for high-throughput antiviral drug screening.

关键词： Bat filovirus Mengla virus(MLAV) Minigenome Repli.ation Antiviral drug screening

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Serum tumor markers expression(CA199,CA242,and CEA)and its cli.ical impli.ations in type 2 diabetes melli.us

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World Journal of Diabetes 2024年第2期15卷 232-239页

作者： Mei Meng li.li.shi Department of Endocrinology Hefei BOE HospitalHefei 230013Anhui ProvinceChina Department of Cadre Ward The First Affiliated Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina

BACKGROUnD Glucose and li.id metaboli. disorder in patients with type 2 diabetes melli.us(T2DM)is associated with the levels of serum tumor markers of the digestive tract,such as cancer antigen(CA)***,tumor markers in T2DM are *** To evaluate the expression of serum tumor markers[CA199,CA242,and carcinoembryonic antigen(CEA)]and the cli.ical impli.ations of the expression in *** For this observational study conducted at Hefei BOE Hospital,China,we enrolled 82 patients with first-onset T2DM and 51 controls between April 2019 and December *** of fasting blood glucose(FBG),tumor markers(CA199,CEA,and CA242),glycosylated hemoglobin(HbA1c),*** measured and group index levels were ***,FBG and HbA1c levels were correlated with tumor marker *** markers were tested for diagnostic accuracy in patients with>9%HbA1c using the receiver operating curve(ROC)*** The T2DM group had high serum FBG,HbA1c,CA199,and CEA levels(Pive analysis of the two groups based on HbA1c levels(Group A:HbA1c≤9%;Group B:HbA1c>9%)revealed significant differences in CEA and CA199 levels(Pnder the ROC curve for CEA and CA199 were 0.853 and 0.809,***199,CEA,and CA242 levels positively correlated with HbA1c(r=0.308,0.426,and 0.551,respectively)and FBG levels(r=0.236,0.231,and 0.298,respectively).COnCLUSiOn As compared to controls,serum CEA and CA199 levels were higher in patients with ***1c and FBG levels correlated with CA199,CEA,and CA242 *** with poorly controlled blood sugar must be screened for tumor markers.

关键词： Type 2 diabetes melli.us Carcinoembryonic antigen Cancer antigen 199 Cancer antigen 242 Glycosylated hemoglobin

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Reoxidation of li.uid steel and evolution of inclusions during protective atmosphere electroslag remelting of Ce-containing heat-resistant stainless steel

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Journal of iron and Steel Research international 2024年第8期31卷 1923-1935页

作者： Yu Zhao Cheng-bin shi shijun Wang Peng Ren Jing li State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China

The evolution of Ce-containing inclusions and its correlation with the reoxidation of li.uid steel during protective atmosphere electroslag remelting(ESR)of heat-resistant steel were *** reoxidation of li.uid steel took place during the ESR,resulting in the oxygen pickup from 0.0014 to 0.0053 wt.%.The inclusions in the consumable electrode,li.uid metal pool and remelted ingot are Ce_(2)O_(2)S and Ce_(2)O,inclusions *** inclusions in the remelted ingot are originated from three ways:(i)the original inclusions from the electrode;(il)the newly formed Ce_(2)O_(2)S and Ce_(2)O_(3) inclusions in the li.uid metal pool by reoxidation remaining still in remelted ingot;(ili.the newly generated Ce2O2S and Ce_(2)O_(3) inclusions during cooli.g and soli.ification of li.uid *** relative proportions of Ce_(2)O_(3) inclusions in li.uid metal pool and remelted ingot are 41% and 76.5%,*** inclusions ranging from 2 to 5μm in the remelted ingot take up 55%,followed by the inclusions smaller than 2μm(43%of total inclusions).The number proportion of the Ce_(2)0,inclusions in the li.uid metal pool which were removed by floating up into slag is 1.96×10-5%.

关键词： non-metalli. inclusion Electroslag remelting Rare earth cerium Reoxidation inclusion evolution

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