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Evolutional Algorithm Based Cascade Long Reach Passive Optical Networks Planning 认领 引用
1
作者 顾仁涛 刘晓旭 +1 位作者 李慧 柏琳 《China Communications》 SCIE CSCD 2013年第4期59-69,共11页
In this paper, we propose a mathe- matical model for long reach Passive Optical Networks （PON） planning. The model consid- ers the traffic demand, user requirements and physical constraints. It can support conven- t... In this paper, we propose a mathe- matical model for long reach Passive Optical Networks （PON） planning. The model consid- ers the traffic demand, user requirements and physical constraints. It can support conven- tional star-like topologies as well as cascade PON networks. Then a two-stage evolutional algorithm is described to solve this problem. The first stage was to find a proper splitter can- didate site set, composing the outer loop. The second stage aimed to get the optimal topology when the splitter locations were selected, com- posing the internal loop. In this algorithm, the Pr/ifer sequence is used to build up a one-to-one correspondence between a PON network configuration and a chromosome. Compared with the results obtained by the enumeration method, the proposed model and algorithm are shown to be effective and accu- rate. 展开更多
关键词 passive optical networks net-work planning evolutional algorithm Pr/ifersequence
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Embed-Solitons and Their Evolutional Behaviors of(3+1)-Dimensional Burgers System 认领 引用
2
作者 ZHU Hai-Ping ZHENG Chun-Long 《Communications in Theoretical Physics》 SCIE CAS 2007年第7期57-62,共6页
With the help of an extended mapping approach and a linear variable separation method,new families ofvariable separation solutions with arbitrary functions for the(3+1)-dimensional Burgers system are derived.Based ont... With the help of an extended mapping approach and a linear variable separation method,new families ofvariable separation solutions with arbitrary functions for the(3+1)-dimensional Burgers system are derived.Based onthe derived exact solutions,some novel and interesting localized coherent excitations such as embed-solitons are revealedby selecting appropriate boundary conditions and/or initial qualifications.The time evolutional properties of the novellocalized excitation are also briefly investigated. 展开更多
关键词 extended mapping method (3+1)-dimensional Burgers system embed-soliton evolutional behavior
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The Function and Evolutional Model Research on Tourism E-commerce 认领 引用
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作者 DENG Zhong-chun 《Chinese Business Review》 2007年第1期65-68,共4页
Tourism E-commerce in the tourism long-term development of tourism, plays an important industry, as the application function on its own for the role in E-commerce, and the E-commerce tourism site as a tourist carder a... Tourism E-commerce in the tourism long-term development of tourism, plays an important industry, as the application function on its own for the role in E-commerce, and the E-commerce tourism site as a tourist carder and its function determined the functions of tourism E-commerce. Moreover, the evolution of E-commerce and tourism are closely related to the evolution of tourism websites. The evolution of E-commerce can guide our future tourism development. 展开更多
关键词 tourism E-commerce function evolutional model
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THE "REBEL TRAVELLING" OF GENERAL NONLINEAREVOLUTIONAL EQUATION AND DISCUSSIONON RELATED PROBLEMS 认领 引用
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作者 欧阳首承 王永中 +1 位作者 吴勇 李超 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1998年第2期179-189,共11页
This paper is a part of series works for discussing the 'auto-destruction effects' of general nonlinear evolutional equations. The blown-up of Navier-Stokes equation is discussed in references [1, 2]. Some exp... This paper is a part of series works for discussing the 'auto-destruction effects' of general nonlinear evolutional equations. The blown-up of Navier-Stokes equation is discussed in references [1, 2]. Some expansion is made in this paper, and the blown-up of order-1 or 2 models and the 'rebel travelling' of complex model of poly-order are discussed. The results indicate that 'semi-rupture' appears for some models on specific condition: the blown-up appears during the whole evolution. For fluid, however, the weakly-nonlinear model is of more artificiality and there is much room for arguing about the smoothing scheme of the numerical integral on the basis of continuous thinking and so on. 展开更多
关键词 'rebel travelling' blown-up 'semi-rupture whole evolution
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The Study on the Evolutional Mechanics of Technological Innovation Network 认领 引用 被引量：1
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作者 Jianqi Mao 《Chinese Business Review》 2003年第3期70-75,共6页
Based on the statistical mechanics and technology innovation network, this paper analyzed network evolutional mechanics, and constituted its evolutional model.
关键词 technology innovation network evolution model
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Global Properties of Evolutional Lotka-Volterra System 认领 引用
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作者 Masafumi Yoshino Yoshinari Tanaka 《Advances in Pure Mathematics》 2013年第9期709-718,共10页
We will study global properties of evolutional Lotka-Volterra system. We assume that the predatory efficiency is a function of a character of species whose evolution obeys a quantitative genetic model. We will show th... We will study global properties of evolutional Lotka-Volterra system. We assume that the predatory efficiency is a function of a character of species whose evolution obeys a quantitative genetic model. We will show that the structure of a solution is rather different from that of a non-evolutional system. We will analytically show new ecological features of the dynamics. 展开更多
关键词 Lotka-Volterra System Global Dynamics Evolution
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Linking evolution of heterogeneous microstructure and rheology of granite to 1000℃ 认领 引用 被引量：4
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作者 Liyuan Liu Shengwen Luo +4 位作者 Derek Elsworth Kai Liu Yifan Luo Hongguang Ji Tao Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1842-1857,共16页
The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safe... The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safety evaluations.In this work,we systematically study the evolution of microstructure and variations in the mechanical properties of granite under high-temperature conditions.The microstructural changes and macro-mechanical properties of rocks are investigated across a temperature range of 25℃–1000℃ through the application of characterization techniques,macro-mechanical experiments,and numerical simulations.High temperatures induce the gradual evolution of micropores and mesopores into macropores,culminating in a significant increase in porosity,with the most rapid rate of increase occurring at 400℃.The X-ray diffraction(XRD)results indicate that the high-temperature environment(below 1000℃)specifically affects the intensity of the maximum diffraction peaks and the half-height width(FWHM)of each mineral component in the granite.The scanning electron microscope(SEM)observation confirms the development of fracture and the reduction in cementation between mineral particles under different temperatures.Additionally,uniaxial and triaxial compression tests were conducted using the GCTS mechanical loading system.Experimental results reveal that the threshold temperature for granite damage is 400℃,and the temperature range for the brittle-ductile transition of granite lies roughly between 600℃ and 800℃.Numerical simulations were performed by employing non-homogeneous rock damage theory and a thermal-mechanical-damage coupling model.Simulated results align well with experimental data.Specifically,the simulations demonstrate that high-temperature treatment causes the redistribution of microstructure in granite,resulting in increased heterogeneity and a change in the failure morphology. 展开更多
关键词 High temperature treatment Thermal damage Microstructure evolution Thermal-mechanical-damage coupling Rock heterogeneity
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Natural and artificial evolution of acetolactate synthase for crop breeding 认领 引用 被引量：3
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作者 Wenbo Pan Yaoyao Zhu +4 位作者 Pingdong Li Zhiqiang Li Chunjue Xu Man Jin Xiaoyan Tang 《The Crop Journal》 SCIE CSCD 2026年第1期95-106,共12页
Acetolactate synthase(ALS)-targeting herbicides are among the most widely used weed-control chemicals globally.Mutations in the ALS gene can confer herbicide resistance in crops,thereby allowing selective elimination ... Acetolactate synthase(ALS)-targeting herbicides are among the most widely used weed-control chemicals globally.Mutations in the ALS gene can confer herbicide resistance in crops,thereby allowing selective elimination of weeds without harming crops.Herbicide-resistant ALS alleles were initially discovered in weeds and subsequently developed through artificial mutagenesis techniques.With the advancement of CRISPR/Cas technologies,various genome-editing tools are now available to introduce these resistant alleles,as well as novel variants,into diverse crop species.Moreover,emerging methodologies,such as directed evolution,enable the generation and screening of large populations of random ALS mutants.Consequently,ALS has become one of the most extensively targeted genes in plant gene evolution.This paper provides a comprehensive overview of both conventional and recently developed strategies for ALS evolution,with particular emphasis on CRISPR/Cas-based genome editing and directed evolution.Future perspectives on technological application are also discussed.By advancing our understanding of herbicide-resistant ALS allele development for crop improvement,these methodologies may also pave the way for their application to the evolution of other agronomically important genes. 展开更多
关键词 Herbicide resistance Acetolactate synthase Genome editing Directed evolution
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Tailoring the d-band center of iridium-doped cobalt selenide for dual-boosted hydrogen and oxygen evolution reactions 认领 引用 被引量：2
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作者 Lulu An Jiang Zhu +1 位作者 Junhao Yang Deli Wang 《Nano Materials Science》 EI CAS CSCD 2026年第3期703-709,共7页
Designing effective electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is essential for the advancement of water electrolysis.Herein,iridium-doped CoSe2(Ir–CoSe2)nanobelts wi... Designing effective electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is essential for the advancement of water electrolysis.Herein,iridium-doped CoSe2(Ir–CoSe2)nanobelts with tailored d-band center are designed to boost both HER and OER in alkaline electrolytes.On the one hand,the adsorption ability of H2O and hydrogen on Ir–CoSe2 is increased due to the upshifted d-band center induced by the electron transfer from CoSe2 to Ir,inducing good HER activity with an overpotential of 126 mV at 10 mA cm-2.On the other hand,the upshifted d-band center of Ir–CoSe2 facilitates the H2O adsorption and ensures the effective exposure of real active sites,resulting in good OER activity with an overpotential of 239 mV at 10 mA cm-2.Meanwhile,when using Ir–CoSe2 as catalysts for alkaline overall water splitting on both HER and OER,a lower voltage of 1.57 V at 10 mA cm-2 is achieved,indicating a good activity and great potential for practical water electrolysis.This work gives an effective method for the rational design of electrocatalysts with customized d-band structures for bifunctional catalysis. 展开更多
关键词 Water electrolysis Hydrogen evolution reaction Oxygen evolution reaction Iridium-doping Bifunctional catalysis
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Fatigue behavior of ballastless track concrete in high-speed railways under different operating speeds 认领 引用 被引量：2
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作者 Jiaxin Wen Huajian Li +2 位作者 Henan Shi Fali Huang Zhen Wang 《Railway Engineering Science》 EI 2026年第1期149-158,共10页
This study investigates the influence of loading frequency on the fatigue behavior of ballastless track concrete for high-speed railways,aiming to support the development of concrete capable of withstanding higher ope... This study investigates the influence of loading frequency on the fatigue behavior of ballastless track concrete for high-speed railways,aiming to support the development of concrete capable of withstanding higher operational speeds.Fatigue tests were conducted at loading frequencies ranging from 5 to 40 Hz,with a focus on fatigue life,damage evolution,energy dissipation,and residual fatigue strain in the concrete.The results indicate that between 5 and 15 Hz,the fatigue life and energy dissipation remain relatively stable,with minimal damage evolution and small residual strains.As the frequency increases to 15-20 Hz,the fatigue life and energy dissipation gradually decrease,while damage accumulation and residual strain increase.Beyond 20 Hz,both fatigue life and energy dissipation decrease rapidly,damage accumulation becomes more pronounced,and residual strain continues to rise.These phenomena are primarily attributed to the increased strain rate and load change rate at higher frequencies,which affect the microstructure evolution and lead to reduced fatigue performance. 展开更多
关键词 Ballastless tracks concrete Flexural fatigue Loading frequency Damage evolution Residual strain
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Oxygen radical coupling on asymmetric Ni-Co dual-sites induced by rare earth hydroxides for enhanced alkaline oxygen evolution reaction 认领 引用 被引量：2
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作者 Jiamin Zhu Shuhui Li +7 位作者 Yue Zhai Zejin Lin Jingzhi Yang Shanshan Wu Nan Zhang Li An Pinxian Xi Chun-Hua Yan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第2期577-585,共9页
The reaction pathway plays a pivotal role in determining the catalytic activity of the oxygen evolution reaction(OER).However,regulating the microscopic reaction pathway through interface construction remains a signif... The reaction pathway plays a pivotal role in determining the catalytic activity of the oxygen evolution reaction(OER).However,regulating the microscopic reaction pathway through interface construction remains a significant challenge.In this study,an interface between amorphous rare earth hydroxides and crystalline spinel NiCo2O4was constructed via selective oxidation.The interface structural units accelerate reconstruction,leading to enhanced catalytic activity,which was observed by in situ Raman spectroscopy.The amorphous RE(OH)3(RE=Y and Eu)optimize asymmetric Ni-Co dual-sites,thereby altering the OER reaction pathway.Specifically,Y(OH)3/NiCo2O4operates through the lattice oxygen mechanism(LOM)at the expense of structural stability,whereas Eu(OH)3/NiCo2O4follows the oxygen pathway mechanism(OPM),preserving both catalytic activity and stability.This study offers a novel approach to controlling reaction pathways and proposes a new strategy for interface construction using rare earth hydroxides. 展开更多
关键词 Asymmetric dual-sites Mechanism regulation Spinel Rare earth hydroxides Oxygen evolution reaction
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Carbon sequestration amount evolution characteristics and reaction mechanisms in coal-based solid waste backfill:A new whole-process carbon sequestration technique 认领 引用 被引量：2
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作者 Nan Zhou Jixiong Zhang +1 位作者 Yuzhe Zhang Hao Yan 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期43-55,共13页
Underground carbon sequestration(CS)by solid waste backfill(SWB)offers an effective pathway for collaborative disposal of coal-based solid waste and CO2,where the amount of carbon sequestration is an important eval... Underground carbon sequestration(CS)by solid waste backfill(SWB)offers an effective pathway for collaborative disposal of coal-based solid waste and CO2,where the amount of carbon sequestration is an important evaluation parameter.In this study,the concept of whole-process carbon sequestration using coal-based solid waste and CO2,including sequential stirring and curing stages,was proposed to evaluate the performance evolution of CS.The results showed that CO2 pressure and ambient temperature positively correlated with the CS amount from coal-based SWB.In particular,CO2 pressure prevailed in the stirring stage,while the ambient temperature effect was more significant in the curing stage.The CS amounts obtained during the stirring stage alone,the curing stage alone,and two sequential stages ranged from 0.66%–3.10%,3.53%–5.09%,and 5.12%–6.02%,respectively.The functional group and micromorphology analyses revealed that the prevailing mechanism at the CS stirring stage was the stirringdriven gas dissolution-leaching-mineralization reaction,while that at the curing stage was the hydration-driven gas permeation-dissociation-CS reaction.Both were essentially solid-liquid-gas multiphase chemical reactions.The results are instrumental in substantiating the coal-based SWB carbon sequestration evolution patterns and mechanisms and providing data support for waste disposal and carbon emission reduction in the coal industry. 展开更多
关键词 Whole-process carbon sequestration Stirring stage Curing stage Carbon sequestration performance evolution Ambient temperature CO2pressure
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Phylogenomic analysis reveals the demographic history and cryptic barriers of three desert fishes 认领 引用 被引量：1
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作者 Chenguang Feng Ruoyu Zhang +5 位作者 Chao Tong Luxian Yu Wulong Ma Kai Zhao Fei Tian Sijia Liu 《Journal of Systematics and Evolution》 SCIE CSCD 2026年第1期66-76,共11页
East Asia's largest inland arid ecological region—the Tarim Basin and Hexi Corridor—serves as an independent evolutionary center for highland ichthyofauna.However,systematic studies on the evolutionary patterns ... East Asia's largest inland arid ecological region—the Tarim Basin and Hexi Corridor—serves as an independent evolutionary center for highland ichthyofauna.However,systematic studies on the evolutionary patterns of fishes in this region remain limited.In this study,we integrated mitochondrial cytochrome b(Cyt b)and nuclear SNP data to investigate the demographic structure and historical dynamics of three desert fish species:Triplophysa tenuis,Triplophysa bombifrons,and Hedinichthys yarkandensis.Our results indicate that populations in the Hexi Corridor and Tarim Basin diverged approximately 0.8 million years ago(Ma),coinciding with a period of increasing aridity,followed by alternating phases of population contraction and secondary contact.Demographic fluctuations were likely driven by westerly atmospheric circulation interacting with regional geological activity.Furthermore,this study provides evidence for the existence of an ancient South Tarim River and suggests the need for taxonomic re-evaluation of T.bombifrons.These findings offer critical insights into the evolutionary processes shaping fish diversity in arid regions of China and inform strategies for their conservation. 展开更多
关键词 aridification evolution hedinichthys phylogeography Triplophysa
The importance of properly correcting the electric double layer effect in unravelling the intrinsic kinetics of electrode reactions 认领 引用 被引量：2
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作者 Bingyu Liu Erfei Zhen +3 位作者 Wei Chen Lulu Zhang Jun Cai Yanxia Chen 《Nano Materials Science》 EI CAS CSCD 2026年第4期866-872,共7页
Understanding the effects of the electric double layer(EDL)on electrode kinetics is of great importance for improving the performance of electrochemical devices.In this work,by using the HER at Au(111)in x M HClO4+... Understanding the effects of the electric double layer(EDL)on electrode kinetics is of great importance for improving the performance of electrochemical devices.In this work,by using the HER at Au(111)in x M HClO4+(1-x)M NaClO4or NaOH as a model reaction,the intrinsic kinetic parameters for HER has been unveiled based on the modified Poisson-Nernst-Planck equations and the Frumkin-Butler-Volmer theory.Our analysis reveals that i)the EDL effects induced changes in proton concentration cH+RPand electric potential φRPat the reaction plane are the main reason for the difference of HER current in the cases with x M HClO4and x M HClO4+(1-x)M NaClO4;ii)the EDL effects are the main origin for the difference in HER current between acidic and alkaline solutions at the Au(111).Our work demonstrates that microkinetic simulation with properly considering the EDL effects is important for unravelling intrinsic reaction kinetics of electrocatalytic reactions. 展开更多
关键词 Hydrogen evolution reaction Proton discharge Au(111)electrode-electrolyte interface Electric double layer effects
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Uncovering the urban-rural integration of China over the past 40 years:Measurement framework and spatial-temporal evolution 认领 引用 被引量：1
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作者 Chuanglin Fang Kewen Wang +6 位作者 Zehui Chen Zhitao Liu Menghang Liu Biao Sun Xia Liao Lingyu Meng Zhiying Yang 《Geography and Sustainability》 CSCD 2026年第3期51-62,共12页
Alleviating the imbalance between urban and rural areas for regional coordinated development is an imperative response to the Sustainable Development Goal 10 of the United Nations.To track China’s urban-rural integra... Alleviating the imbalance between urban and rural areas for regional coordinated development is an imperative response to the Sustainable Development Goal 10 of the United Nations.To track China’s urban-rural integration progress and address the uneven issues in specific fields,this study constructed a novel seven-dimension index system of urban-rural integration,comprising free population mobility,efficient land transfer,interactive economic growth,highly-linked transportation,equal public services,joint environmental governance and unimpeded informatization between urban and rural areas.Based on a comprehensive measurement framework and multi-source panel data,we uncovered the spatial-temporal evolution of urban-rural integration in China’s 367 prefecture-level administrative units from 1980 to 2022.The results demonstrated that China’s urban-rural integration steadily increased from 27.51 to 57.35 with an average annual growth rate of 3.40%.Whereas,the overall urban-rural integration was relatively inferior in 2022,at the level of moderate integration whose proportion of China’s land area was 88.08%.The urban-rural integration level in eastern region and urban agglomerations was higher than that in mid-west and non-urban agglomerations.From the perspective of seven dimensions,interactive economic growth,joint environmental governance and unimpeded informatization made an obvious improvement and reached higher integration,while free population mobility,efficient land transfer,highly-linked transportation and equal public services maintained the stage of moderate integration in 2022.In the future,China should make targeted efforts for urban-rural integration in terms of population,land use,transportation and public services,and accelerate urban-rural common prosperity in the mid-west and economically underdeveloped areas. 展开更多
关键词 Urban-rural integration Measurement framework Spatial-temporal evolution Heterogeneity China
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Electric charge induction monitoring of deformation and failure behavior of igneous rock:Laboratory test and field application 认领 引用 被引量：2
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作者 Wei Wang Yishan Pan +5 位作者 Hongrui Zhao Yonghui Xiao Xiaoliang Li Xinyang Bao Yan Liu Jinming Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期861-886,共26页
To advance the theoretical understanding,technological development,and field application of electric charge induction for monitoring rock deformation and failure,this study investigates the induced electric charge gen... To advance the theoretical understanding,technological development,and field application of electric charge induction for monitoring rock deformation and failure,this study investigates the induced electric charge generated during the deformation and failure of igneous rocks.The charge originates mainly from a combination of electrical polarization and triboelectric effects.Through laboratory experiments,we analyzed the time-frequency evolution of induced electric charge signals and identified relevant monitoring parameters.An online downhole electric charge induction monitoring system was developed and validated in the field.Experimental results show that the dominant frequency range of induced electric charge signals generated during igneous rock deformation and failure lies between 0 and 23 Hz,and a low-pass finite impulse response(FIR)filter effectively suppresses noise.Optimal sensor distances for monitoring cubic and cylindrical specimens were determined to be 17 mm and 13 mm,respectively.We proposed early warning indicators,including the maximum absolute value of the induced electric charge,the arithmetic mean value,the distribution dispersion coefficient,and the cumulative sum value.In field application,time-domain curves and spatial distribution charts of these warning indicators correspond well with changes in abutment stress ahead of the mining face,offering indirect insights into local stress evolution.This research provides technical and equipment support for the application of electric charge induction technology to monitoring and early warning of coal bursts. 展开更多
关键词 Time-frequency domain evolution law Noise reduction filtering Electric charge induction monitoring parameters Early warning index Online downhole electric charge induction monitoring system
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Insights into crystal growth and morphology evolution mechanism of multi-component carbide:Experiments and first-principles calculations 认领 引用 被引量：1
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作者 Yong Fan Yuyao Chen +7 位作者 Jin Wang Lei Gu Kaixuan Zhou Yuanyuan Gong Wei Liu Yonghao Zhao Xiangfa Liu Jinfeng Nie 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2026年第1期27-34,共8页
Multi-component transition metal carbides(MTMCs)have garnered significant attention for their out-standing high-temperature stability and versatile properties,which make them ideal candidates for a wide range of indus... Multi-component transition metal carbides(MTMCs)have garnered significant attention for their out-standing high-temperature stability and versatile properties,which make them ideal candidates for a wide range of industrial applications.However,the underlying mechanisms governing the crystal growth and morphological evolution of MTMCs remain poorly understood,hindering the design of materials with tailored characteristics.In this paper,we employ an in-situ liquid-solid reaction method to synthesize(HfTaZrNbTi)C MTMC powders and explore their crystal growth and morphology evolution.The synthesized(TiZrHfNbTa)C powders exhibit two distinct morphologies:cubic,primarily composed of Ti,Hf,Ta,and Zr with a small amount of Nb,and octahedral,rich in Ti and Ta with minor amounts of Hf,Nb,and Zr.First-principles calculations show that the surface energy of the(100)plane is lower than the(111)plane,leading to the formation of the cubic morphology.The octahedral morphology forms due to decreased mixing entropy and higher theoretical density compared to cubic particles.Our findings provide valuable insights into the crystal growth and morphology evolution mechanisms of high-entropy ceramics,contributing to the rational design of MTMCs with engineered crystal structures for diverse structural and functional applications. 展开更多
关键词 Multi-component carbide First-principles calculations Crystal growth Morphology evolution mechanism
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Genetic insights into drainage evolution:Late Miocene river capture in the eastern Himalaya 认领 引用 被引量：1
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作者 Xiaoyun Sui Pengcheng Lin +3 位作者 Liuyong Ding Huanshan Wang Jonathan Waters Dekui He 《Journal of Systematics and Evolution》 SCIE CSCD 2026年第1期33-48,共16页
The unique geomorphology of rivers in the eastern Himalaya has long intrigued geologists,yet their drainage history remains debated.Drainage reorganization can have a significant impact on genetic differentiation in f... The unique geomorphology of rivers in the eastern Himalaya has long intrigued geologists,yet their drainage history remains debated.Drainage reorganization can have a significant impact on genetic differentiation in freshwater taxa.This study employs the cold-adapted fish genus Schizothorax as a biogeographic proxy to reconstruct the evolutionary history of the Yarlung Tsangpo-Brahmaputra River(YTB),with a focus on a prominent hanging valley tributary-trunk stream system.Phylogeographic analyses of mitochondrial cyt b gene sequences identified a monophyletic QTP-YGP clade comprising species from the Qinghai-Tibet Plateau(QTP)and the Yunnan-Guizhou Plateau(YGP).Within the QTP-YGP lineage,YTB species represent the earliest diverging clade.In contrast,species from the Indus and Ganges basins are more closely related to congeners from the southeastern QTP and YGP.The YTB assemblage is further subdivided into two distinct clades.Molecular dating suggests that the YTB lineage diverged from the broader QTP-YGP group during the early Late Miocene,with the two YTB clades separating in the Late Miocene.We propose that a paleo-Yarlung Tsangpo-Dingba(Dibang)-Brahmaputra river and a Yigong-Parlung-Zayul(Lohit)river were established prior to the Late Miocene and were subsequently captured by the lower Yarlung Tsangpo River—via the Siang and Zhaqu,respectively—during the late Miocene and Quaternary.The modern YTB drainage configuration was established by the late Early Pleistocene.This study underscores the importance of integrating genetic,fauna and geomorphological data to understand the complex evolution of drainages in the eastern Himalayas. 展开更多
关键词 cladogenetic event paleo-drainage evolution river capture the eastern Himalayan syntaxis Yarlung Tsangpo
Dynamic evolution of copper-based catalysts during CO2 electroreduction 认领 引用 被引量：2
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作者 Zhizheng Wu Pengpeng Yang Minrui Gao 《Nano Materials Science》 EI CAS CSCD 2026年第3期687-702,共16页
The CO2 electroreduction reaction(CO2RR)is a promising approach of using renewable electricity to synthesize fuels and value-added chemicals.At present,Cu is generally considered to be the major monometallic cat... The CO2 electroreduction reaction(CO2RR)is a promising approach of using renewable electricity to synthesize fuels and value-added chemicals.At present,Cu is generally considered to be the major monometallic catalyst capable of producing multicarbon products(C2+)with high current densities from the CO2RR,but it still suffers from the low activity and high overpotential.The challenge of sluggish CO2RR kinetics can be overcome by developing efficient Cu-based catalysts,which undergo the dynamic evolution during the reaction process.The dynamic evolution of the Cu-based catalysts taking place under working conditions makes it difficult to study the structure-activity correlation and reaction mechanism present during CO2RR.Recently,a number of important works have observed and revealed the dynamic evolution process of Cu-based catalysts by operando characterization techniques.This aspect,however,remains less summarized and prospected in the CO2RR literature.In this Review,we summarize the dynamic evolution of Cu-based catalysts during the CO2RR from aspects of structure,composition and oxidation state.We highlight the correlations between evolution behaviors and catalytic properties.Then,we discuss the dynamic deactivation process of Cu-based catalysts during CO2RR,including metal impurities contamination and carbon accumulation.In particular,we introduce recent advancements in in situ characterization techniques those are employed to probe the dynamic evolution under operating conditions.We end the Review by outlining the challenges and offering personal perspectives on the future development opportunities in this field. 展开更多
关键词 Copper-based catalysts CO2electroreduction reaction Dynamic evolution
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Water oxidation promoted synergistically by CeO2-shell on CoNiO2-core 认领 引用 被引量：1
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作者 Bolin Zhao Rana Muhammad Irfan +3 位作者 Chuhao Liu Shamraiz Hussain Talib Azhar Mahmood Li Niu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第2期642-649,共8页
Rare-earth based transition metal oxides have proved to be the most promising candidates in the exploration of non-precious oxygen evolution reaction(OER) catalysts. However, the knowledge regarding their active sites... Rare-earth based transition metal oxides have proved to be the most promising candidates in the exploration of non-precious oxygen evolution reaction(OER) catalysts. However, the knowledge regarding their active sites and electrocatalytic mechanism is very limited due to their different crystallization behaviors and there are still big challenges in the efficient coupling of transition and rareearth metals with full utilization of active sites. To improve and stabilize OER catalysis, we developed the core–shell CeO2@CoNiO2 nanoplates(NPLs) for enhanced and stable OER catalysis. Surprisingly,CeO2 shell regulates the electronic structure of CoNiO2 core and increases the number of active sites and oxygen vacancies to achieve high electrochemical performance in a three-electrode system. Compared with CoNiO2 nanoparticles, the developed core–shell NPLs exhibit favorable performance with an overpotential of only 206 mV at 10 m A/cm2 and robust electrochemical stability of 500 h at 10 mA/cm2 and 300 h at 50 mA/cm2. In situ Raman spectroscopy unveils that CeO2@CoNiO2 is structurally more stable than CoNiO2, which is consistent with its performance persistence. Besides, theoretical calculations confirm that the Ce shell serves as the active centers for OER, and the formed core–shell metal oxides NPLs promote the adsorption and dissociation of water, thus causing the fast generation of O2.This work provides a new perspective for designing highly active core–shell structure of mixed metal oxides of transition and rare-earth metals for OER. 展开更多
关键词 Oxygen evolution reaction Rare-earth metal Core-shell CeO2 Rare earths
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