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Experimental investigation on ice-breaking performance of a novel plasma striker

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Chinese Journal of Aeronautics 2022年第1期35卷 307-317页

作者： tianxiang GAO Zhenbing LUO yan ZHOU Shengke yanG Wenqiang PENG Xiong DENG Pan CHENG College of Aerospace Engineering National University of Defense TechnologyChangsha 410073China China Aerodynamics Research and Development Center Mianyang 621000China

Aircraft icing has long been a plague to aviation for its serious threat to flight ***,researches about a newly proposed deicing method based on Plasma Synthetic Jet Actuator(PSJA)have just *** meet the requirements of in-flight deicing,structure of PSJA needs to be *** paper completed the detailed design and experimental validation of a novel plasma striker,which was a modified version of *** of mass of the moving part and rod shapes on the ice-breaking performances were also ***,a“conical-nosed rod configuration”was *** purpose was to ensure a good ice-breaking performance of the plasma striker on long ice,by generating a splitting *** show that,though mass of the moving part was just several grams,ice-breaking performance was better when the mass was *** rectangular rod could generate an elliptical circumferential crack,whose major axis was parallel to the direction of the long side of the rectangular *** the“conical-nosed rod”concept was verified to be able to generate a splitting crack which can spread completely to the far end of long ice,and the crack direction was parallel to edge line of the *** general,the plasma striker has the advantages of simple structure,low energy consumption,little harm to the flow field and the aircraft *** will be carried out in future works to study in detail the working process of the plasma striker.

关键词： Conical shaped rod Deicing Experimental tests High-speed photography Ice fracture Plasma striker

Morphological characteristics and DNA barcoding of Pampus echinogaster(Basilewsky, 1855)

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Acta Oceanologica Sinica 2017年第12期36卷 18-23页

作者： LI Yuan ZHANG yan GAO tianxiang HAN Zhiqiang LIN Longshan ZHANG Xiumei Third Institute of Oceanography State Oceanic Administration Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences National Engineering Research Center for Marine Aquaculture Zhejiang Ocean University

The morphological similarities of Pampus fishes have led to considerable confusion in species-level identification,and no accurate information on neotype or DNA barcoding of Pampus echinogaster is available. Two hundred and seven specimens of P. echinogaster were collected from the coastal waters of Dandong, Dongying, Qingdao,Nantong, Zhoushan, Wenzhou, Changle, Taiwan, and Wakayama（Japan）, from June 2010 to April 2013. The diagnostic characteristics of P. echinogaster are as follows： dorsal fin VIII-XI-43–51, anal fin V-VIII-43–49, pectoral fin 22–27, caudal fin 19–22, pelvic fin absent; first gill rakers sparse, slender（pointed）, 3–4＋12–16=15–20; vertebrae39–41; transverse occipital canal on top of head moderately small, wavy ridges not reaching upper origin of pectoral fin; ventral branch of lateral line canal spare, shorter than dorsal branch of lateral line canal. By combining congener sequences of the cytochrome oxidase I（COI） gene from Gen Bank, two absolute groups were detected among all specimens, which further indicated that two valid species were present based on genetic differences in amino acid sequences and the distance between the groups. The sequences of Group 1 can be regarded as DNA barcoding of P. echinogaster. The correct morphological redescription and DNA barcoding of *** are presented here to provide a guarantee for efficient and accurate studies, a theoretical basis for classification, and enable appropriate fishery management and conservation strategies for the genus Pampus in the future.

关键词： morphological characteristics DNA barcoding Pampus echinogaster genetic differentiation transverse occipital canal

Parentage determination of black sea bream(Acanthopagrus schlegelii)for stock enhancement:effectiveness and loss of genetic variation

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Acta Oceanologica Sinica 2021年第6期40卷 41-49页

作者： Binbin Shan yan Liu Na Song Changping yang Shengnan Liu tianxiang Gao Dianrong Sun Key Laboratory of South China Sea Fishery Resources Exploitation&Utilization Ministry of Agriculture Rural AffairsGuangzhou 510300China Guangdong Provincial Key Laboratory of Fishery Ecology and Environment Guangzhou 510300China Scientific Observation and Research Field Station of Pearl River Estuary Ecosystem of Guangdong Province Guangzhou 510300China South China Sea Fisheries Research Institute Chinese Academy of Fisheries SciencesGuangzhou 510300China Fishery College Ocean University of ChinaQingdao 266003China Fishery College Zhejiang Ocean UniversityZhoushan 316022China

The stock enhancement programs for black sea bream Acanthopagrus schlegelii have been conducted in China for a ***,little information has been reported concerning the effectiveness and genetic effect of black sea bream stock *** order to detect the contribution of released individuals in Zhujiang River Estuary(ZRE)and Daya Bay(DB),six microsatellite markers were used to identify the hatchery-released *** addition,this pedigree of hatchery populations(broodfish and hatchery-released offspring)was traced to detect the number of effective parents(N_(e)),the inbreeding coefficient and the decrease of genetic variability in the *** pedigree reconstruction showed that at least 69(out of 93)broodfish had *** estimated N_(e) was 54.8,consequently the inbreeding coefficient was 0.91%.The genetic diversity of hatchery-released offspring was lower than that in that of broodfish(heterozygosity alleles,0.727-0.774),some alleles(number of alleles,61-69)and genetic variance were lost during *** was observed that wild samples had higher levels of genetic diversity compared with hatchery populations as well as recaptured samples in releasing area.A total of 128 hatchery-released black sea bream were identified among 487 recaptured samples in ZRE,while a total of 15 samples were identified among 96 samples in *** summary,there was a high survival of released fish.N_(e)vertheless,the results provided evidence to consider a loss of genetic variation in hatcheryreleased stock and a negative genetic effect of the stock enhancement.

关键词： Acanthopagrus schlegelii stock enhancement effectiveness microsatellite maker genetic effect pedigree of hatchery populations

Morphological characters and DNA barcoding of Syngnathus schlegeli in the coastal waters of China

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Journal of Oceanology and Limnology 2018年第2期36卷 537-547页

作者： CHEN Zhi ZHANG yan HAN Zhiqiang SONG Na GAO tianxiang Institute of Evolution and Marine Biodiversity Ocean University of China Qingdao 266003 China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Qingdao 266071 China Fisheries College Zhejiang Ocean University Zhoushan 316022 China

A Syngnathus species widely distributed in Chinese seas was permanently identified as Syngnathus acus by native ichthyologists, but the taxonomic description about this species was inadequate and lacking conclusively molecular evidence. To identify this species, 357 individuals of this species from the coastal waters of Dandong, yantai, Qingdao and Zhoushan were collected and measured. Morphological results showed that these slender specimens were mainly brownish, usually mottled with pale. Standard length ranged from 117 mm to 213 mm with an average length of 180.3 mm. The above characters were consistent with S. schlegeli distributed in Japan but colored differently from and much smaller than typical S. acus reported in Europe. Thus, morphological studies revealed that this species was previously misidentified as S. acus and might be S. schlegeli in reality. In addition, a fragment of cytochrome oxidase subunit I （CO1） gene of mitochondrial DNA was also sequenced for species identification, and 15 COl sequences belonging to different Syngnathus species were also used for the molecular identification. CO1 sequences of our specimens had the minimum genetic distance from recognized S. schlegeli from Japan and clustered with it firstly. The phylogenetic analysis similarly suggested that the species previously identified as S. acus in the coastal waters of China was S. schlegeli actually.

关键词： re-identification cytochrome oxidase subunit I (COO phylogenetics pipefish Chinese taxonomy of fishes

Design,test,and verification of in-situ condition preserved coring and analysis system in lunar-based simulation environment

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International Journal of Mining Science and Technology 2024年第9期34卷 1259-1272页

作者： Haichun Hao Mingzhong Gao yan Wu Zheng Gao Yongcheng Li Xuemin Zhou Peng Chu Xuan Wang Jiahua Li Lang Zhou Jie Song tianxiang Ao Yikun yang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China

The lunar surface and its deep layers contain abundant resources and valuable information resources,the exploration and exploitation of which are important for the sustainable development of the human economy and *** exploration and research in the field of deep space science,especially lunar-based exploration,is a scientific strategy that has been pursued in China and *** and sampling are key to accurate exploration of the desirable characteristics of deep lunar *** this study,an in-situ condition preserved coring(ICP-Coring)and analysis system,which can be used to test drilling tools and develop effective sampling strategies,was *** key features of the system include:(1)capability to replicate the extreme temperature fluctuations of the lunar environment(-185 to 200℃)with intelligent temperature control;(2)ability to maintain a vacuum environment at a scale of 10^(-3) Pa,both under unloaded conditions within Ф580 mm×1000 mm test chamber,and under loaded conditions using Ф400 mm×800 mm lunar rock simulant;(3)application of axial pressures up to 4 MPa and confining pressures up to 3.5 MPa;(4)sample rotation at any angle with a maximum sampling length of 800 mm;and(5)multiple modes of rotary-percussive drilling,controlled by penetration speed and weight on bit(WOB).Experimental studies on the drilling characteristics in the lunar rock simulant-loaded state under different drill bit-percussive-vacuum environment configurations were *** results show that the outgassing rate of the lunar soil simulant is greater than that of the lunar rock simulant and that a low-temperature environment contributes to a reduced vacuum of the lunar-based simulated *** rotary-percussive drilling method effectively shortens the sampling *** increasing sampling depth,the temperature rise of the drilling tools tends to rapidly increase,followed by slow growth or steady *** temperature rise energy accu

关键词： Lunar-based Large temperature difference Vacuum Drilling and coring System design

Preparation and Properties of Vegetable-Oil-Based Thioether Polyol and Ethyl Cellulose Supramolecular Composite Films

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Journal of Renewable Materials 2023年第4期11卷 1937-1950页

作者： Ruyu yan Jian Fang Xiaohua yang Na Yao Mei Li Yuan Nie tianxiang Deng Haiyang Ding Lina Xu Shouhai Li College of Materials Science and Technology Beijing Forestry UniversityBeijing100083China Institute of Chemical Industry of Forestry Products CFANanjing210042China National Engineering Lab.for Biomass Chemical Utilization Nanjing210042China Key Lab.of Chemical Engineering of Forest Products National Forestry and Grassland AdministrationNanjing210042China Key Lab.of Biomass Energy and Material Nanjing210042China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing210042China

Ethyl cellulose(EC),an important biomass-based material,has excellent film-forming ***,the high interchain hydrogen bond interaction leads to a high glass transition temperature of EC,which makes it too brittle to be used *** hydroxyl group on EC can form a supramolecular system in the form of a non-covalent bond with an effective *** this study,an important vegetable-oil-based derivative named dimer fatty acid was used to prepare a novel special plasticizer for ***-fatty-acid-based thioether polyol(DATP)was synthesized and used to modify ethyl cellulose *** supramolecular composite films of DATP and ethyl cellulose were designed using the newly-formed van der Waals *** thermal stability,morphology,hydrophilicity,and mechanical properties of the composite films were all *** EC is fragile,and the addition of DATP makes the ethyl cellulose films more *** elongation at the break of EC supramolecular films increased and the tensile strength decreased with the increasing DATP *** elongation at the break of EC/DATP(60/40)and EC/DATP(50/50)was up to 40.3%and 43.4%,***,the thermal initial degradation temperature of the film with 10%DATP is higher than that of pure EC,which may be attributed to the formation of a better supramolecular system in this composite *** application of bio-based material(EC)is environmentally friendly,and the novel DATP can be used as a special and effective plasticizer to prepare flexible EC films,making it more widely used in energy,chemical industry,materials,agriculture,medicine,and other fields.

关键词： Ethyl cellulose dimeric fatty acid based thioether polyol supramolecular system composite films

A precipitate-free AlCoFeNi eutectic high-entropy alloy with strong strain hardening

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Journal of Materials Science & Technology 2021年第30期89卷 88-96页

作者： Peijian Shi Yi Li Yuebo Wen Yiqi Li yan Wang Weili Ren tianxiang Zheng Yifeng Guo Long Hou Zhe Shen Ying Jiang Jianchao Peng Pengfei Hu Ningning Liang Qingdong Liu Peter K.Liaw Yunbo Zhong State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai200444China Materials Genome Institute Shanghai UniversityShanghai200444China Laboratory for Microstructures Shanghai UniversityShanghai200444China School of Materials Science and Engineering Nanjing University of Science and TechnologyJiangsu210094China Institute of Materials Modification and Modelling School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA

Over recent years,eutectic high-entropy alloys(EHEAs)have intrigued substantial research enthusiasms due to their good castability as well as balanced strength-ductility *** this study,a bulk cast Al_(19.25)Co_(18.86)Fe_(18.36)Ni_(43.53)EHEA is developed with fine in-situ lamellar *** eutectics comprise alternating ordered face-centered-cubic(L1_(2))and ordered body-centered-cubic(B2)phases with semicoherent *** resulting microstructure resembles that of most reported as-cast EHEAs,but the B2 lamellae are devoid of nano-precipitates because of the Cr-element removal in current tailored eutectic ***,the B2 lamellae still feature much higher deformation resistance than the L1_(2) lamellae,so that less lattice defects are detected in the B2 lamellae until the *** interestingly,in the L1_(2) lamellae we identify a dynamic microstructure refinement that correlates to extraordinary strain hardening in *** precipitate-free EHEA consequently shows excellent tensile ductility of~10%and high ultimate strength up to~956 MPa.

关键词： High-entropy alloy Lamellar eutectic Deformation resistance Microstructure refinement Strain hardening

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青藏高原维管植物物种丰富度分布的情景模拟

地理学报 2018年第1期73卷 164-176页

作者：范泽孟黄言岳天祥中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室北京100101 中国科学院大学北京100039

如何充分利用离散的观测数据,通过对维管植物物种分布丰富度及其与生境因子之间的相互作用和影响机理的定量分析,实现维管植物物种丰富度的空间分布及其情景模拟,是目前生物多样性研究前沿和核心内容之一。针对这一问题,在实现青藏高原3... 详细信息

如何充分利用离散的观测数据,通过对维管植物物种分布丰富度及其与生境因子之间的相互作用和影响机理的定量分析,实现维管植物物种丰富度的空间分布及其情景模拟,是目前生物多样性研究前沿和核心内容之一。针对这一问题,在实现青藏高原37个国家自然保护区的维管植物物种数量收集和边界数据矢量化的基础上,分别进行维管植物物种数量与土地覆盖类型、环境因子和景观生态指数等三大类生境因子之间的相关关系的定量计算和对比分析,筛选和确定最佳相关分析方程,进而构建青藏高原维管植物物种丰富度的空间模拟分析模型。该模型中,维管植物物种丰富度与生境因子之间的复相关系数为0.94,模型验证结果表明,青藏高原的维管植物物种的平均丰富度为496.79种/100 km^2,其空间分布格局整体上呈东南向西北逐渐减少趋势;另外,除柴达木盆地荒漠区域以外,维管植物物种的空间分布随海拔的升高而减少。基于CMIP5 RCP 2.6、RCP 4.5和RCP 8.5三种气候情景模拟获得的青藏高原维管植物物种丰富度未来情景结果显示,在T0-T4(2010-2100)时段内,青藏高原维管植物物种丰富度整体将呈减少趋势。RCP 8.5情景下青藏高原维管植物物种丰富度的变化幅度最大,而RCP 2.6情景下的维管植物物种丰富度的变化幅度最小。研究表明,本文构建的模型能够对青藏高原维管植物物种丰富度的空间分布格局及其未来情景进行模拟分析,模拟结果可为青藏高原生物多样性及其对气候变化响应的综合评估和情景模拟提供方法和技术支持。

关键词：青藏高原维管植物物种丰富度空间分析模型情景分析

逆变型分布式电源接入配电网单相断线故障零序电压分析

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电力系统保护与控制 2022年第2期50卷 41-51页

作者：徐岩邹南马天祥新能源电力系统国家重点实验室(华北电力大学) 河北保定071003 国网河北省电力有限公司电力科学研究院河北石家庄050021

随着绝缘导线的大量应用,配电网发生断线故障概率增加。针对逆变类分布式电源(Inverter Interfaced Distributed Generation,IIDG)对传统断线故障特性产生影响这一问题,分析并仿真验证了IIDG接入配电网发生断线故障时的故障特征。首先,... 详细信息

随着绝缘导线的大量应用,配电网发生断线故障概率增加。针对逆变类分布式电源(Inverter Interfaced Distributed Generation,IIDG)对传统断线故障特性产生影响这一问题,分析并仿真验证了IIDG接入配电网发生断线故障时的故障特征。首先,建立了含IIDG配电网故障模型,推导得出单相断线不接地、单相断线电源侧接地以及单相断线负荷侧接地三种故障形态下的断口两侧零序电压表达式。其次,通过绘制相量图的方法,分析了故障位置、过渡电阻以及IIDG输出特性对系统侧零序电压分布的影响。最后,分析了IIDG不同额定容量下零序电压的变化情况。理论分析结果表明,只有故障点下游的IIDG才会对零序电压分布轨迹产生影响。仿真结果验证了所述分析方法的合理性以及分析结果的正确性。

关键词：配电网 IIDG 断线零序电压相量图

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