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Acta Geochimica 2017年第3期36卷 482-485页

作者： Jian Ni haiyang xu Libin Liu College of Chemistry and Life Sciences Zhejiang Normal University Yingbin Avenue 688 Jinhua 321004 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesLincheng West Road 99 Guiyang 550081 China Puding Karst Ecosystem Research Station Chinese Academy of Sciences Puding 562100 China

Aboveground net primary productivity(ANPP)of two dominant species, one deciduous tree(Platycarya strobilacea) and one evergreen tree(Machilus cavaleriei),was estimated based on the tree-ring width and the girth increment as well as allometric functions in a karst evergreen and deciduous broadleaved mixed forest in central Guizhou Province, southwestern China. Results showed that the ANPP increased from 1961 to 2015, especially during the last 20–30 years, but with strong variations. The deciduous tree had higher ANPP than the evergreen tree according to two kinds of estimates by the tree ring and girth increment. The averaged ANPP for these two mature trees was 2.27 kg/individual/year, ca. 8 t/ha/year considering the normal stand density. Such karst forest productivity was lower than the natural subtropical forests in China and in the world.

关键词： Biomass increment Tree ring Girth measurement Karst evergreen and deciduous broadleaved forest Allometric functions

Monitoring time property in time-sensitive LSC

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Journal of Systems Engineering and Electronics 2015年第4期26卷 857-867页

作者： haiyang xu Yi Zhuang Jingjing Gu School of Computer Science and Technology Nanjing University of Aeronautics and Astronautics School of Science and Information Qingdao Agricultural University

In order to accurately describe the software require- ments and automatically extract property formulas, the time prop- erty of the live sequence chart （LSC） is focused. For the time- sensitive LSC （TLSC）, the formal syntax and semantic are defined by introducing the formal definitions of clock and timing constraints. The main function of the TLSC is to extract the temporal logic formula, so basic rules and combination rules are proposed to translate the TLSC into the universal fragment of computation tree logic （CTL） formula. To improve the efficiency of model check, transitivity is also used to optimize the formula. The optimization method could reduce the size of the formula under the condition of equivalence. Finally, a case study is introduced to illustrate how to establish the TLSC of requirements. In terms of the proposed transformation rules, the time property formula is extracted from the TLSC, and the design model is assured which is consistent with the property formula. The results show that the method with respect to the automatic extraction of the logic formula from the TLSC can efficiently monitor the time property of software systems.

关键词： live sequence chart (LSC) timing constraint temporallogic transformation rule.

Accelerated and enhanced osteointegration of MAO-treated implants:histological and histomorphometric evaluation in a rabbit model

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International Journal of Oral Science 2018年第2期10卷 81-91页

作者： Xin Li haiyang xu Baodong Zhao Shuai Jiang Department of Oral Implantology the Affiliated Hospital of Qingdao UniversityQingdaoChina School of Stomatology Qingdao UniversityQingdaoChina Department of Oral Implantology of Zibo Central Hospital ZiboChina

Microarc oxidation（MAO） has become a promising technique for the surface modification of implants. Therefore, the aims of this study were to further quantitatively and qualitatively evaluate the osteointegration abilities of MAO-treated and smooth surface（SF） implants in vivo and to investigate the areas in which the superiority of MAO-treated implants are displayed. In a rabbit model,a comprehensive histomorphological, osteogenic, mineralizational, and integrative assessment was performed using light microscopy, fluorescence microscopy, confocal laser scanning microscopy, and radiographic analyses. Compared with the SF groups, the MAO-treated groups exhibited more active contact osteogenesis, as well as distant osteogenesis, under fluorescence examination, the mineral apposition rate was found to be greater for all of the MAO-treated implants, and the osteointegration index（OI） value was greater in the MAO-treated groups at different times. In conclusion, the calcium-rich amorphous layer created by MAO provided a better environment for osteointegration, with more active contact osteogenesis, a more rapid mineral apposition rate and greater OI values.

关键词： MAO Accelerated and enhanced osteointegration MAO-treated implants histological histomorphometric evaluation rabbit model

Seasonal variability of the wind-generated near-inertial energy flux in the South China Sea

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Acta Oceanologica Sinica 2019年第4期38卷 136-145页

作者： Baonan Sun Zhan Lian Yeli Yuan haiyang xu College of Oceanic and Atmospheric Sciences Ocean University of China Key Laboratory of Marine Science and Numerical Modeling First Institute of OceanographyMinistry of Natural Resources Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao)

After validated by the in-situ observation, the slab model is used to study the wind-generated near-inertial energy flux(NIEF) in the South China Sea(SCS) based on satellite-observed wind data, and its dependence on calculation methods and threshold criteria of the mixed layer depth(MLD) is investigated. Results illustrate that the total amount of NIEF in the SCS could be doubled if different threshold criteria of MLD are adopted. The NIEF calculated by the iteration and spectral solutions can lead to a discrepancy of 2.5 GW(1 GW=1×109 W). Results also indicate that the NIEF exhibits spatial and temporal variations, which are significant in the boreal autumn,and in the southern part of the SCS. Typhoons are an important generator of NIEF in the SCS, which could account for approximately 30% of the annual mean NIEF. In addition, deepening of the MLD due to strong winds could lead to a decrease of NIEF by approximately by 10%. We re-estimate the annual mean NIEF in the SCS,which is(10±4) GW and much larger than those reported in previous studies.

关键词： near-inertial energy flux mixed layer depth South China Sea typhoon

Recent progress in ZnO-based heterojunction ultraviolet light-emitting devices

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Chinese Science Bulletin 2014年第12期59卷 1219-1227页

作者： Yichun Liu haiyang xu Chunyang Liu Weizhen Liu Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University

Wide bandgap(3.37 eV)and high excitonbinding energy of ZnO(60 meV)make it a promising candidate for ultraviolet light-emitting diodes(LEDs)and low-threshold lasing diodes(LDs).However,the difficulty in producing stable and reproducible high-quality p-type ZnO has hindered the development of ZnO p–n homojunction *** alternative strategy for achieving ZnO electroluminescence is to fabricate heterojunction devices by employing other available p-type materials(such as p-GaN)or building new device *** this article,we will briefly review the recent progress in ZnO LEDs/LDs based on p–n heterostructures and metal–insulatorsemiconductor *** methods to improve device efficiency are also introduced in detail,including the introduction of Ag localized surface plasmons and single-crystalline nanowires into ZnO LEDs/LDs.

关键词：紫外发光二极管异质结器件 ZnO 光发射器件表面等离子体激元异质结构氧化锌激光二极管

Memristors with organic-inorganic halide perovskites

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InfoMat 2019年第2期1卷 183-210页

作者： Xiaoning Zhao haiyang xu Zhongqiang Wang Ya Lin Yichun Liu Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchunChina

Organic-inorganic halide perovskites(OHPs)have been intensively studied for application in solar cells with high conversion efficiency exceeding 22%.The unique electrical and optical properties of OHPs have led to their use in optoelectronic device applications beyond photovoltaics,such as light-emitting diodes,photodetectors,*** information storage technologies and computing architectures are being researched extensively with the aim of addressing the growing challenge of approaching end of Moore's law and von Neumann *** the fourth basic circuit element,memristor is a leading candidate with powerful capabilities in information storage and neuromorphic computing ***,OHPs have received growing attention as promising materials for *** particular,their mixed ionic-electronic conduction ability paired with light sensitivity provide OHPs with the opportunity to display novel functions such as optical-erase memory,optogenetics-inspired synaptic functions,and lightaccelerated learning *** review covers recent advances in OHP-based memristors development including memristive mechanism and analytical models,universal memristive characteristics for memory and neuromorphic computing applications,and novel *** and future prospects of OHP-based memristors are also discussed.

关键词： memristors neuromorphic computing nonvolatile memory organic-inorganic halide perovskites resistive switching

Advances in memristor based artificial neuron fabrication-materials,models,and applications

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International Journal of Extreme Manufacturing 2024年第1期6卷 27-50页

作者： Jingyao Bian Zhiyong Liu Ye Tao Zhongqiang Wang Xiaoning Zhao Ya Lin haiyang xu Yichun Liu Key Laboratory for UV Light-Emitting Materials and Technology(Northeast Normal University) Ministry of Education5268 Renmin StreetChangchunPeople’s Republic of China

Spiking neural network(SNN),widely known as the third-generation neural network,has been frequently investigated due to its excellent spatiotemporal information processing capability,high biological plausibility,and low energy consumption *** to the working mechanism of human brain,the SNN system transmits information through the spiking action of ***,artificial neurons are critical building blocks for constructing SNN in *** are drawing growing attention due to low consumption,high speed,and nonlinearity characteristics,which are recently introduced to mimic the functions of biological *** have proposed multifarious memristive materials including organic materials,inorganic materials,or even two-dimensional *** advantage of the unique electrical behavior of these materials,several neuron models are successfully implemented,such as Hodgkin–Huxley model,leaky integrate-and-fire model and integrate-and-fire *** this review,the recent reports of artificial neurons based on memristive devices are *** addition,we highlight the models and applications through combining artificial neuronal devices with sensors or other electronic ***,the future challenges and outlooks of memristor-based artificial neurons are discussed,and the development of hardware implementation of brain-like intelligence system based on SNN is also prospected.

关键词： artificial neuron memristor memristive materials neuron model micro-nano manufacturing spiking neural network

Antisense oligonucleotide technology can be used to investigate a circular but not linear RNA-mediated function for its encoded gene locus

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Science China(Life Sciences) 2021年第5期64卷 784-794页

作者： Zhenxing Song Ruirui Jia Mingfeng Tang Fei Xia haiyang xu Zhengguo Li Chuan Huang School of Life Sciences Chongqing UniversityChongqing 400044China Center of Plant Functional Genomics Institute of Advanced Interdisciplinary StudiesChongqing UniversityChongqing 400044China

As a class of powerful molecular tool,antisense oligonucleotides(ASOs)are not only broadly used in protein and RNA biology,but also a highly selective therapeutic strategy for many *** the concept that ASO reagents only reduce expression of the targeted gene in a post-transcriptional manner has long been established,the effect and mechanism of ASO reagents on RNA polymerase II(Pol II)transcription are largely *** raised question is particularly important for the appropriate use of ASOs and the valid interpretation of ASO-mediated *** this study,our results show that linear RNA ASO attenuates transcription of nascent transcripts by inducing premature transcription termination which is combinatorially controlled by Integrator,exosome,and Rat1 in ***,circular RNA(circRNA)ASO transfection does not affect transcription activity of the encoded *** data suggest that the ASO technique can be applied to study a circRNA-mediated but not linear RNA-mediated function for its encoded gene locus.

关键词： antisense oligonucleotide premature transcription termination circular RNA linear RNA

Ultra-broadband metamaterial absorbers from long to very long infrared regime

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Light(Science & Applications) 2021年第8期10卷 1462-1473页

作者： Yu Zhou Zheng Qin Zhongzhu Liang Dejia Meng haiyang xu David R.Smith Yichun Liu State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunJilinChina. University of Chinese Academy of Sciences 100049 BeijingChina. Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education College of PhysicsNortheast Normal University130024 ChangchunChina. Center for Metamaterials and Integrated Plasmonics Duke UniversityP.O.Box 90291DurhamNC 27708USA

Broadband metamaterials absorbers with high absorption,ultrathin thickness and easy configurations are in great demand for many potential *** this paper,we first analyse the coupling resonances in a Ti/Ge/Ti three-layer absorber,which can realise broadband absorption from 8 to 12 *** we experimentally demonstrate two types of absorbers based on the Ti/Ge/Si_(3)N_(4)/Ti *** taking advantage of coupling surface plasmon resonances and intrinsic absorption of lossy material Si_(3)N_(4),the average absorptions of two types of absorbers achieve almost 95%from 8 to 14μm(experiment result:78%from 6.5 to 13.5μm).In order to expand the absorption bandwidth,we further propose two Ti/Si/SiO_(2)/Ti absorbers which can absorb 92%and 87%of ultra-broadband light in the 14-30μm and 8-30μm spectral range,*** findings establish general and systematic strategies for guiding the design of metamaterial absorbers with excellent broadband absorption and pave the way for enhancing the optical performance in applications of infrared thermal emitters,imaging and photodetectors.

关键词： absorber absorption coupling

Fabrication and Pressureless Sintering of Silicon Carbide Refractories

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China's Refractories 2021年第4期30卷 40-44页

作者： GUO Junhua WANG Wenwu CAO Huiyan xu haiyang Sinosteel Luoyang Institute of Refractories Research Co. Ltd.Luoyang 471039China

This work studies the fabrication and pressureless sintering of silicon carbide(SiC)*** particles were adopted as aggregates,introducing different amounts(20%,30%,40%,50%,and 60%,by mass)of submicron SiC powder,adding resin as the binder and the carbon source,and B4C as the sintering *** is found that when the mass ratio of B4C to the submicron SiC powder is 3%,the optimal sintering can be *** the increase of the submicron powder addition,the sintering linear shrinkage increases and the mechanical properties *** optimal sintering temperature is 2050-2100℃.

关键词： silicon carbide refractories submicron silicon carbide powder pressureless sintering