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Defence Technology（防务技术） 2024年第1期31卷 242-261页

作者： Junbo Yan qiyue zhang Yan Liu Yingliang Xu Zhenqing Shi Fan Bai Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Limited research has been conducted on the influences of fiber content on close-in blasting characteristics for ultrahigh-performance fiber-reinforced concrete(UHPFRC)*** paper aims to address this knowledge gap through experimental and mesoscale numerical *** were conducted on ten UHPFRC beams built with varying steel fiber volumetric fractions subjected to close-in explosive ***,this study considered other parameters,such as the longitudinal reinforcement type and *** the case of UHPFRC beams featuring normal-strength longitudinal reinforcement of diametersΦ12,Φ16,andΦ20,a reduction in maximum displacement by magnitudes of19.6%,19.5%,and 17.4%was observed,respectively,as the volumetric fractions of fiber increased from1.0%to 2.5%.In addition,increasing the longitudinal reinforcement ratio and using high-strength steel longitudinal reinforcement both significantly reduced the deformation characteristics and increase the blasting resistances of UHPFRC ***,the effects on the local crushing and spalling damage were not significant.A mesoscale finite element model,which considers the impacts of fiber parameters on UHPFRC beam behaviors,was also established and well correlated with the test ***,parametric analyses were further conducted to examine the impacts of the steel fiber content and length and the hybrid effects of various types of microfibers and steel fibers on the blasting performance of UHPFRC beams.

关键词： Blast performance Close-in blast Fiber content Mesoscale approach UHPFRC beams

Enhanced Corrosion Resistance and Biofilm Inhibition of Functionally Graded TC4/TC4-5Cu Fabricated by Selective Laser Melting against Streptococcus mutans

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Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 1961-1978页

作者： Xing Zhou qiyue zhang Jiarui Lu Ying Zheng Lin Wu Dake Xu Xue zhang Qiang Wang Savaid Stomatology School Hangzhou Medical CollegeHangzhou 311399China Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China

Ti-6Al-4V(TC4)used in dentistry and orthopedics as implant biomaterial faces the risk of microbiologically influenced corrosion(MIC)owing to the residence of diverse oral ***,Streptococcus mutans is a critical pathogenic microorganism that causes dental *** work investigated the corrosive effects of *** on TC4 and functional gradient TC4/TC4-5Cu coupons fabricated by selective laser melting(SLM)through various electrochemical measurements,surface examination,observation of biofilm and corrosion *** results indicated that the Cu-bearing alloy showed an inhibitory effect on the biofilms due to the release of Cu element,thereby reducing the corrosion rate of *** corrosion current density(icorr)of TC4(11.7±0.8)nA cm−2 is higher than that of TC4/TC4-5Cu(7.4±0.4)nA cm−2 in the presence of ***,while the maximum pit depth of TC4 is 1.6 times that of TC4/***,metal modification through Cu alloying is an effective strategy to improve the MIC resistance.

关键词： Microbiologically influenced corrosion-Streptococcus mutans Selective laser melting TC4/TC4-5Cu:Biofilm

Ablative behavior and mechanism of SiC_(f) /SiBCZr composites prepared by PIP process

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Journal of Advanced Ceramics 2024年第1期13卷 124-134页

作者： Mingwei Chen Yuliang Zhao Haipeng Qiu Shijian Liu Weijie Xie Yi Chen qiyue zhang AVIC Manufacturing Technology Institute Beijing 100130China

SiC_(f)/SiBCZr composites were prepared by polymer precursor impregnation and pyrolysis process with near stoichiometric ratio SiC fiber preform as reinforcement phase and SiBCZr multiphase ceramic precursor as impregnating *** results highlighted that the SiC_(f)/SiBCZr composites exhibited excellent ablative properties after ablative tests at 1200℃/3600 s and 1400℃/3600 s,and the strength retention rates of the composites reached 90%and 85%,*** was mainly due to the liquid sealing effect of the ablative products represented by B2O_(3) and SiO_(2)∙B_(2)O_(3),which inhibited the ablative reaction by reducing the diffusion rate of the oxidation medium,and the solid pinning effect of the substances represented by SiO_(2),ZrO_(2),and ZrSiO_(4),which could play high viscosity and high strength characteristics to improve anti-erosion *** above-mentioned SiC_(f)/SiBCZr composites with corrosion resistance,oxidation resistance,and ablative resistance provided a solid material foundation and technical support for the development of reusable spacecraft hot-end components.

关键词： near stoichiometric ratio SiC fiber SiC_(f)/SiBCZr composite liquid sealing effect solid pinning effect

Microbially Induced Carbonate Precipitation in a Middle Triassic Microbial Mat Deposit from Southwestern China:New Implications for the Formational Process of Micrite

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Journal of Earth Science 2021年第3期32卷 633-645页

作者： Mao Luo Jitao Chen Wenkun Qie Jinyuan Huang qiyue zhang Changyong Zhou Wen Wen State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PalaeoenvironmentChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Institute of Geological Survey China University of GeosciencesWuhan 430074China Chengdu Center of China Geological Survey Chengdu 610081China

Lime mud(i.e.,micrite)is a major component of carbonate *** mechanisms(biotic versus abiotic)have been proposed for the formation of lime mud in Earth’s ***,the detailed role that microbes play in the nucleation and subsequent precipitation of micrites remains to be *** we undertook a detailed geobiological characterization of laminated lime mudstone from the Middle Triassic Guanling Formation in Yunnan Province,southwestern *** features,together with previous geobiological investigations,suggest that the laminated lime mudstones represent the former presence of microbial *** lime mudstones consist mainly of calcite,dolomite and quartz,with clay minerals and pyrites as subordinate *** particular,micro-analysis shows copious nano-globules(65–878 nm)and capsule-shaped nano-rods in *** low-Mg calcite nano-globule aggregates are closely associated with mucilaginous biofilms resembling extracellular polymeric substances(EPS).Nano-sized globules coalesce to form semi-euhedral micrite *** suggest that a decaying hydrolytic destruction of the EPS by microbial communities within microbial mat leads to the precipitation of the nano-globules by enhancing alkalinity in local *** an intermediate,these nano-globules further aggregate to form micrite crystals possibly through a dissolution-reprecipitation process.

关键词： nano-globule EPS micrite microbial mat Middle Triassic Luoping Biota

A conodont-based Middle Triassic age assignment for the Luoping Biota of Yunnan, China

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Science China Earth Sciences 2009年第10期52卷 1673-1678页

作者： zhang qiyue ZHOU ChangYong LU Tao XIE Tao LOU XiongYing LIU Wei SUN YuanYuan HUANG JinYuan ZHAO LaiShi Chengdu Intitute of Geology and Mineral Resources Geological Survey of ChinaChengdu 610081China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

The Luoping Biota consists of abundant and well-preserved marine fishes, reptiles, invertebrates, and plants. It occurs in the Middle Triassic Guanling Formation in Daaozi Village of Luoping County, Yun-nan Province, China. Based on conodonts, the Luoping Biota is determined to lie within the Nicoraella kockeli Zone, which is assigned to the Pelsonian substage of the Anisian.

关键词： Luoping Biota Anisian Guanling Formation conodont

Exceptionally Preserved Conodont Natural Assemblages from the Middle Triassic Luoping Biota,Yunnan Province,China:Implications for Architecture of Conodont Feeding Apparatus

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Journal of Earth Science 2023年第6期34卷 1762-1776页

作者： Jinyuan Huang Carlos Martinez-Perez qiyue zhang Kexin zhang Mao Luo Wen Wen Changyong Zhou Xiao Min Zhixin Ma Tao Xie Michael J.Benton Philip C.J.Donoghue Chengdu Center China Geological Survey(Geosciences Innovation Center of Southwest China)Chengdu 610081China Cavanilles Institute of Biodiversity&Evolutionary Biology University of Valencia46980 ValenciaSpain Institute of Geological Survey China University of GeosciencesWuhan 430074China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China School of Ocean Sciences China University of GeosciencesBeijing 100083China School of Earth Sciences University of BristolBristol BS81TQUK

Articulated natural assemblages contain direct evidence of the element numbers,morphologies,positions and structures for reconstructing the feeding apparatuses of conodont animals,but these kind of materials are very rare in fossil *** we report ten new conodont natural assemblages from Member II of the Guanling Formation in Luoping County,eastern Yunnan Province,southwestern *** assemblages were obtained from the fossil-bearing layers of the Luoping Biota,dated to the early Middle Triassic Anisian stage(Pelsonian substage).These fossiliferous laminated limestones mainly consist of calcites and dolomites,with platy clay minerals and pyrites as subordinate components,indicating that the conodont assemblages were preserved in a lower energy and anoxic sedimentary *** new natural assemblages preserve the primary collapse orientations of the Nicoraella feeding apparatus from the Luoping Biota,showing the relative original positions of the S,M and P elements,that could be further used to refine the architecture of this apparatus in space variable M elements and the position unclear P1 *** previously reported three-dimensional and bilaterally symmetrical fused clusters,we statistically analyze the size of the positional homogenous elements within different sized materials,in particular S4,S3,or S2 elements,indicates that elements ontogenic changes do not affect the apparatus *** of Nicoraella apparatus remains stable in the process of ontogeny,so our reconstructed model is *** is the first time that ample types of materials have been used to restore a conodont apparatus within one genus,namely natural assemblages(articulated and disarticulated),fused clusters(articulated,disarticulated,compressed,and relatively three-dimensional),and abundant discrete elements,*** materials together record the most complete information on architecture in the gondolelloid apparatuses,thus enabling us

关键词： conodont natural assemblage architecture fused cluster size variation limestone MiddleTriassic southwestern China

Palaeoecological Analysis of Trace Fossil Sinusichnus sinuosus from the Middle Triassic Guanling Formationin Southwestern China

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Journal of Earth Science 2018年第4期29卷 854-863页

作者： Mao Luo Yi-Ming Gong G. R. Shi Zhong-Qiang Chen Jinyuan Huang Shixue Hu Xueqian Feng qiyue zhang Changyong Zhou Wen Wen School of Life and Environmental Sciences (Melbourne Burwood Campus) Deakin University Burwood VIC 3125 Australia State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan 430074 China Chengdu Center of China Geological Survey Chengdu 610081 China

The Luoping Biota discovered from the early Middle Triassic （Anisian） Guanling Formation of southwestern China represents a fully recovered shallow marine ecosystem, marking the end point of Early Triassic biotic recovery following the end-Permian mass extinction. Contemporaneously preserved are prolific trace fossils, which offer good opportunities to understand the palaeoecology of marine invertebrates from a fully recovered shallow marine ecosystem. Here we present a newly discovered sinuous branching burrow from the fossil-bearing unit in Member II of the Guanling Formation. Several features, including the horizontal regular sinuous nature, the branching pattern, typical H-junction, and the small wavelength/amplitude ratio of these sinuous structures within the burrow systems justify assignment of these traces as Sinusichnus sinuosus, a trace possibly produced by decapod crustaceans. Close association ofS. sinuosus with Rhizocorallium commune suggests a deposit-feeding strategy of these trace makers. The newly reported Anisian material from the Guanling Formation in Luoping represents first report of Sinusichnus from South China. The global record of Sinusichnus occurrence suggests that these burrows might have an older history than Early Middle Triassic.

关键词： Sinusichnus sinuosus decapod crustacean trace fossil Middle Triassic Luoping southwestern China

Polyakov-loop拓展的夸克介子模型中的Roberge-Weiss相变研究

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原子核物理评论 2020年第3期37卷 713-719页

作者：张啟玥张昭华北电力大学数理学院北京102206

Z_(3)-QCD是具有严格中心对称性的类QCD理论,研究其在特殊条件下的性质有助于理解QCD退禁闭相变。本文应用三种味道的Polyakov-loop拓展的夸克介子模型作为Z_(3)-QCD的低能有效理论,研究了不同中心对称性破缺模式下的Roberge-Weiss(RW)... 详细信息

Z_(3)-QCD是具有严格中心对称性的类QCD理论,研究其在特殊条件下的性质有助于理解QCD退禁闭相变。本文应用三种味道的Polyakov-loop拓展的夸克介子模型作为Z_(3)-QCD的低能有效理论,研究了不同中心对称性破缺模式下的Roberge-Weiss(RW)相变。为保证RW周期性,本文采用味道依赖的虚化学势(μu,μd,μs)=iT(θ2Cπ/3,θ,θ+2Cπ/3),其中0≤C≤1。传统的和夸克反馈效应改进的两种不同Polyakov-loop势被分别用于相应的计算。研究表明,当N_(f)=3,C≠1时,RW相变出现在θ=π/3(mod2π/3)处,其强度随C值的减小而加强;当C=1,N_(f)=2+1时,RW相变位置出现反常,变为θ=2π/3(mod 2π/3);而当C=1,N_(f)=1+2时,RW相变点又返回θ=π/3 (mod 2π/3)。上述几种情形的RW相变端点均为三相点。研究发现,夸克反馈效应使得RW相变强度减弱,退禁闭相变温度变低,但并未改变前述的定性结论。

关键词： PQM模型夸克反馈作用 RW相变退禁闭相变

国际法院针对俄乌冲突“防止争端加剧”临时措施分析

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国际展望 2022年第4期14卷 114-131,157,158页

作者：张琪悦上海国际问题研究院全球治理研究所上海200233

国际法院在乌克兰诉俄罗斯案中做出采取临时措施的指示,将“防止争端加剧”义务施予双方。“防止争端加剧”作为本案法官达成一致意见的临时措施,相较于国际法院的其他临时措施具有相对独立性与特殊性。国际法院对这项临时措施的论证持... 详细信息

国际法院在乌克兰诉俄罗斯案中做出采取临时措施的指示,将“防止争端加剧”义务施予双方。“防止争端加剧”作为本案法官达成一致意见的临时措施,相较于国际法院的其他临时措施具有相对独立性与特殊性。国际法院对这项临时措施的论证持较宽松的标准,并可以根据实际需要适当调整义务主体与内容,反映出国际法院拥有自由裁量权及其作为联合国和国际社会最重要的司法机构承担的重要职责。国际法院在本案中及时采取临时措施,对于避免争端加剧或扩大,以及促进国际争端的和平解决具有积极意义。但“防止争端加剧”临时措施的执行面临困难,原因在于《国际法院规约》和《国际法院规则》未对不执行临时措施的后果予以明确,通过联合国安理会保障本案临时措施实施不具有可行性,国际法院不存在执行机制也直接影响执行效果,国际法院的职责定位导致其难以解决引发俄乌冲突的本质争议。未来,当事双方应当明确临时措施的法律约束力,充分发挥联合国体系及其各机构的职能,并综合运用法律、政治、外交等多重途径,共同推动争端的和平解决。

关键词：俄乌冲突国际法院临时措施防止争端加剧

Aneuploidy of chromosome 8 in circulating tumor cells correlates with prognosis in patients with advanced gastric cancer

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Chinese Journal of Cancer Research 2016年第6期28卷 579-588页

作者： Yilin Li Xiaotian zhang Jifang Gong qiyue zhang Jing Gao Yanshuo Cao Daisy Dandan Wang Peter Ping Lin Lin Shen Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Department of Gastrointestinal Oncology Peking University Cancer Hospital & Institute Cytelligen San Diego

Objective： Previous work indicated that aneuploidy of chromosome 8 in circulating tumor cells（CTCs）correlated with therapeutic efficacy for advanced gastric cancer（AGC） patients. In this follow-up study performed on the same population of AGC patients, we investigated whether and how aneuploidy of chromosome 8 in CTCs correlates with patients＇ clinical ***： The prospective study was performed on 31 patients with newly diagnosed AGC. Previously established integrated subtraction enrichment（SE） and immunostaining-fluorescence in situ hybridization（i FISH）platform was applied to identify, enumerate and characterize CTCs. Quantification of CTCs and analysis of their aneuploidy of chromosome 8 were performed on patients before and after ***： CTCs were measured in 93.5% of AGC patients, and two CTC subtypes with diverse threshold values were identified, multiploid CTCs with the threshold of ≥2 per 7.5 m L and multiploid plus triploid CTCs with the threshold of ≥4, which were found to significantly correlate with poor progression-free survival（PFS） and overall survival（OS）. In particular, patients with ≥10% increased multiploid CTCs after an initial 6 weeks of therapy had poor PFS and OS, whereas improved PFS and OS were observed on those who had ≥10% decreased multiploid CTCs. After adjusting for clinically significant factors, ≥10% increased post-therapy multiploid CTCs was the only independent predictor of PFS and ***： Aneuploidy of CTCs correlates with prognosis of AGC patients. Quantitative comparison monitoring multiploid CTCs before and after therapy may help predict improved or inferior prognosis and chemoresistance.

关键词： Circulating tumor cells advanced gastric cancer aneuploidy i FISH prognosis