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Gene-associated microsatellite markers confi rm panmixia and indicate a diff erent pattern of spatially varying selection in the endangered Japanese eel Anguilla japonica

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Journal of Oceanology and Limnology 2020年第5期38卷 1572-1583页

作者： YU Lei liu Yanfang liu Jinxian CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China.

The Japanese eel(Anguilla japonica)is a commercially important fi sh.species in East Asia and its recruitment has been rapidly declining since *** the genetic population structure of *** is the basis of multinational cooperation on its management and protection,due to its large distribution ***-associated markers have been proved powerful in delineating fi ne-scale population genetic structure and spatially varying *** the present study,we developed 24 polymorphic gene-associated microsatellite markers including 18 loci associated with the genes under selection in the two North Atlantic eel species(Anguilla anguilla and Anguilla rostrata)and 6 loci based on transcript sequences.A total of 13 geographic populations were sampled across its distribution range,including 11 samples from China(9 from China’s mainland and 2 from Taiwan region),and 2 samples from Japan.A total of 416 individuals(mostly glass eels)were collected and genotyped at the 24 *** measures of diff erentiation were accordant with a panmictic scenario(F ST=-0.001)in *** footprints of spatially varying selection were found,indicating that the selection pattern in *** might be diff erent from that in the two North Atlantic eel *** suggest that *** sh.uld be managed as a single unit and management and conservation eff orts must be coordinated at the international level,as overexploitation in any region will decrease its recruitment across the whole distributional range.

关键词： Japanese eel Anguilla japonica panmixia gene-associated microsatellite spatially varying selection

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On the Convergence of Products _sh.1h_n in the Adams Spectral Sequence

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Acta Mathematica Sinica,English.Series 2007年第6期23卷 1025-1032页

作者： Xiu Gui liu School of Mathematical Sciences and LPMC Nankai University Tianjin 300071 P.R. China

Abstract Let A be the mod p Steenrod algebra and S the sphere spectrum localized at p, where p is an odd prime. In 2001 Lin detected a new family in the stable homotopy of spheres which is represented by （b0hn-h1bn-1）∈ ExtA^3,（p^n＋p）q（Zp,Zp） in the Adams spectral sequence. At the same time, he proved that i.（hlhn） ∈ExtA^2,（p^n＋P）q（H^＊M, Zp） is a permanent cycle in the Adams spectral sequence and converges to a nontrivial element ξn∈π（p^n＋p）q-2M. In this paper, with Lin＇s results, we make use of the Adams spectral sequence and the May spectral sequence to detect a new nontrivial family of homotopy elements jj′j^-γsi^-i′ξn in the stable homotopy groups of spheres. The new one is of degree p^nq ＋ sp^2q ＋ spq ＋（s - 2）q ＋ s - 6 and is represented up to a nonzero scalar by hlhnγ-s in the E2^s＋2,＊-term of the Adams spectral sequence, where p ≥ 7, q = 2（p - 1）, n ≥ 4 and 3 ≤ s 〈 p.

关键词： stable homotopy groups of spheres Adams spectral sequence May spectral sequence

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Southern Hemisphere Volcanism Triggered Multi-year La Niñas during the Last Millennium

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Advances in Atmospheric Sciences 2024年第4期41卷 587-592页

作者： sh.ngrong ZHOU Fei liu School of Atmospheric Sciences Sun Yat-Sen University Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Educationand Southern Marine Science and Engineering Guangdong LaboratoryZhuhai 519082China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science and TechnologyNanjing 210044China

To explain the recent three-year La Niña event from 2020 to 2022,which has caused catastrophic weather events worldwide,Fasullo et al.(2023)demonstrated that the increase in biomass aerosol resulting from the 2019-20 Australian wildfire season could have triggered this multi-year La Niñ***,we present compelling evidence from paleo-proxies,utilizing a substantial sample size of 26 volcanic eruptions in the Southern Hemisphere(sh.,to support the hypothesis that ocean cooling in the sh.can lead to a multi-year La Niña *** research highlights the importance of focusing on the Southern Ocean,as current climate models struggle to accurately simulate the Pacific response driven by the Southern Ocean.

关键词： volcanic eruptions multi-year La Niñas Australian wildfire southern ocean cooling

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Evolution of Apatites in the Diagenesis

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Acta Geologica Sinica(English.Edition) 1990年第2期64卷 147-162,233+236页

作者： liu Kuiwu Institute of Geology, Academia Sinica, Beijing liu Linqun Chinese Academy of Geological Sciences Beijing

Apatites occurring in sedimentary rocks are carbonate fluorapatites (C-F apatites) with differentCO_2 contents. During diagenesis. the CO_2 in the C-F apatites gradually decreased with the increasing strengthof diagenesis. resulting in the systematic changes in refractive index. specific gravity, cell parameters and crystalchemistry of apatites. On the basis of X-ray diffraction and IR spectroscopic analyses, the author proposes twoparameters for determining diagenetic stages. i.e.. the crystallinity index (CR) and sh.rpness index (sh.. Thesetwo parameters serve as new criteria for the determination. which due to the common existence of phosphorousnodules and bands and argillo-crystalline cement in sedimentary rocks, most likely have wide prospects for ap-plication.

关键词： Evolution of Apatites in the Diagenesis

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Fe-doped SnO_(2) nanosh.et for ambient electrocatalytic nitrogen reduction reaction

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Nano Research 2022年第7期15卷 6026-6035页

作者： Yaxi Li Yixian liu Xiang liu Yunliang liu Yuanyuan Cheng Peng Zhang Peiji Deng Jiujun Deng Zhenhui Kang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China Institute of Medicine&Chemical Engineering Zhenjiang CollegeZhenjiang 212000China Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationInstitute of Environmental Research at Greater BayGuangzhou UniversityGuangzhou 510006China School of Physics The University of SydneySydneyNew South Wales 2006Australia Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Ammonia plays a vital role in the development of modern agriculture and *** to the conventional Haber–Bosch ammonia synthesis in industry,electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising and environmental friendly strategy to synthesize ***,inspired by biological nitrogenase,we designed iron doped tin oxide(Fe-doped SnO_(2))for nitrogen *** this work,iron can optimize the interface electron transfer and improve the poor conductivity of the pure SnO_(2),meanwhile,the synergistic effect between iron and Sn ions improves the catalyst *** the electrocatalytic NRR test,Fe-doped SnO_(2) exhibits a NH_(3) yield of 28.45μg·h^(−1)·mgcat^(−1),which is 2.1 times that of pure SnO_(2),and Faradaic efficiency of 6.54%at−0.8 V *** in 0.1 M Na_(2)SO_(4).It also sh.ws good stability during a 12-h long-term stability *** functional theory calculations sh.w that doped Fe atoms in SnO_(2) enhance catalysis performance of some Sn sites by strengthening N–Sn interaction and lowering the energy barrier of the rate-limiting step of *** transient photovoltage test reveals that electrons in the low-frequency region are the key to determining the electron transfer ability of Fe-doped SnO_(2).

关键词： electrocatalyst nitrogen reduction reaction Fe-doped SnO_(2)

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Copy number variations of MTHFSD gene across pig breeds and its association with litter size traits in Chinese indigenous Xiang pig

Copy number variations of MTHFSD gene across pig breeds and ...

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中国生物化学与分子生物学会第十二届全国会员代表大会暨2018年全国学术会议

作者： Ran XQ Pan H Huang sh.liu C Niu X Li S Wang JF College of Animal Science/Institute of Agro-Bioengineering Guizhou University Tongren University

Copy number variation(CNV) is a major proportion of genetic variation,which changes the gene structure and dosage and affects gene expression and *** validate the presence and the function of CNV in pig,we used real-time quantitative polymerase chain reaction(qPCR) method to validate a 496 kb CNV region comprising MTHFSD gene on chromosome 6 of Xiang pig detected by single nucleotide polymorphism(SNP) *** we investigated the distribution of the MTHFSD CNV in a total of 545 pigs in four *** 46.2% and 32.7% individuals in the four pig breeds were detected to be types of loss and gain of MTHFSD *** relative copy numbers of MTHFSD gene sh.wed the largest variation range(0-55 copies) in the Xiang pig *** copy numbers of MTHFSD gene presented the positive correlations with the transcript level of MTHFSD gene in adult *** analysis indicated that CNVs of MTHFSD gene was significantly changed the litter size traits of Xiang pigs,and the individuals with CNV gain sh.wed more litter size than the CNV loss *** have reasons to believe that the MTHFSD as RNA-binding protein play an important role in pig reproduction as a result of regulating MTHFS mRNA metabolism.

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An IBEM solution to the scattering of plane sh.waves by a lined tunnel in elastic wedge space

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Earthquake Science 2015年第1期28卷 71-86页

作者： Zhongxian liu Lei liu Tianjin Chengjian University Key Laboratory of Soft Soils and Engineering Environmental of Tianjin Tianjin Chengjian University Earthquake Engineering Research Institute of Tianjin

The indirect boundary element method （IBEM） is developed to solve the scattering of plane sh.waves by a lined tunnel in elastic wedge space. According to the theory of single-layer potential, the scattered-wave field can be constructed by applying virtual uniform loads on the surface of lined tunnel and the nearby wedge surface. The densities of virtual loads can be solved by establish.ng equations through the continuity conditions on the interface and zero-traction conditions on free surfaces. The total wave field is obtained by the superposition of free field and scattered-wave field in elastic wedge space. Numerical results indicate that the IBEM can solve the diffraction of elastic wave in elastic wedge space accurately and effi- ciently. The wave motion feature strongly depends on the wedge angle, the angle of incidence, incident frequency, the location of lined tunnel, and material parameters. The waves interference and amplification effect around the tunnel in wedge space is more significant, causing the dynamic stress concentration factor on rigid tunnel and the displacement amplitude of flexible tunnel up to 50.0 and 17.0, respectively, more than double that of the case of half-space. Hence, considerable attention sh.uld be paid to seismic resistant or anti-explosion design of the tunnel built on a slope or hillside.

关键词： Wedge space Scattering Lined tunnelPlane sh.waves Indirect boundary element method(IBEM) Dynamic stress concentration

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Strengthening network slicing for Industrial Internet with deep reinforcement learning

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Digital Communications and Networks 2024年第4期10卷 863-872页

作者： Yawen Tan Jiadai Wang Jiajia liu National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology School of CybersecurityNorthwestern Polytechnical UniversityXi’an710072China

Industrial Internet combines the industrial system with Internet connectivity to build a new manufacturing and service system covering the entire industry chain and value *** highly heterogeneous network structure and diversified application requirements call for the applying of network slicing *** robust network slicing is essential for Industrial Internet,but it faces the challenge of complex slice topologies caused by the intricate interaction relationsh.ps among Network Functions(NFs)composing the *** works have not concerned the strengthening problem of industrial network slicing regarding its complex network *** this end,we aim to study this issue by intelligently selecting a subset of most valuable NFs with the minimum cost to satisfy the strengthening ***-of-the-art AlphaGo series of algorithms and the advanced graph neural network technology are combined to build the *** results demonstrate the superior performance of our scheme compared to the benchmark schemes.

关键词： Industrial Internet Network slicing Deep reinforcement learning Graph neural network

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An Improved Unsupervised Image Segmentation Method Based on Multi-Objective Particle Swarm Optimization Clustering Algorithm

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Computers, Materials & Continua 2019年第2期58卷 451-461页

作者： Zhe liu Bao Xiang Yuqing Song Hu Lu Qingfeng liu School of Computer Science and Telecommunication Engineering Jiangsu UniversityZhenjiang212013China School of Computer Science Jilin Normal UniversitySiping136000China Institute of Science and Technology Information Jiangsu UniversityZhenjiang212013China

Most image segmentation methods based on clustering algorithms use singleobjective function to implement image *** avoid the defect,this paper proposes a new image segmentation method based on a multi-objective particle swarm optimization(PSO)clustering *** unsupervised algorithm not only offers a new similarity computing approach based on electromagnetic forces,but also obtains the proper number of clusters which is determined by scale-space *** is experimentally demonstrated that the applicability and effectiveness of the proposed multi-objective PSO clustering algorithm.

关键词： Multi-objective optimization particle swarm optimization electromagnetic forces scale-space theory

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Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides

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Light(Science & Applications) 2022年第11期11卷 2774-2781页

作者： Xuesh. Li Jiantao Ma sh.nfa liu Peinian Huang Bo Chen Dunzhao Wei Jin liu State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen University510275 GuangzhouChina

Integrated photonics provides unprecedented opportunities to pursue advanced nonlinear light sources with lowpower consumptions and small footprints in a scalable manner,such as microcombs,chip-scale optical parametric oscillators and integrated quantum light *** a variety of nonlinear optical processes,high-efficiency second harmonic generation(sh.)on-chip is particularly appealing and yet *** this work,we present efficient sh. in highly engineerable semi-nonlinear waveguides consisting of electron-beam resist waveguides and thin-film silicon nitride(SiN)/lithium niobate(LN).By carefully designing octave-separating bound states in the continuum(BICs)for the nonlinear interacting waves in such a hybrid structure,we have simultaneously optimized the losses for both fundamental frequency(FF)and second harmonic(sh.waves and achieved modal phasing matching and maximized the nonlinear modal overlap between the FF and sh.waves,which results in an experimental conversion efficiency up to 4.05%W^(-1)cm^(-2).Our work provides a versatile and fabrication-friendly platform to explore on-chip nonlinear optical processes with high effciency in the context of nanophotonics and quantum optics.

关键词： nonlinear harmonic lithium

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