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Fatigue shear performance of concrete beams reinforced with hybrid(glass-fiber-reinforced polymer+steel)rebars and stirrups

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Frontiers of Structural and Civil Engineering 2021年第3期15卷 576-594页

作者： Peng ZHU Jiajing XU wenjun qu Department of Structural Engineering Tongji UniversityShanghai200092China School of Transportation and Civil Engineering Nantong UniversityNantong226019China

Reinforced concrete beams consisting of both steel and glass-fiber-reinforced polymer rebars exhibit excellent strength,serviceability,and durability.However,the fatigue shear performance of such beams is unclear.Therefore,beams with hybrid longitudinal bars and hybrid stirrups were designed,and fatigue shear tests were performed.For specimens that failed by fatigue shear,all the glass-fiber-reinforced polymer stirrups and some steel stirrups fractured at the critical diagonal crack.For the specimen that failed by the static test after 8 million fatigue cycles,the static capacity after fatigue did not significantly decrease compared with the calculated value.The initial fatigue level has a greater influence on the crack development and fatigue life than the fatigue level in the later phase.The fatigue strength of the glass-fiber-reinforced polymer stirrups in the specimens was considerably lower than that of the axial tension tests on the glass-fiber-reinforced polymer bar in air and beam-hinge tests on the glass-fiber-reinforced polymer bar,and the failure modes were different.Glass-fiber-reinforced polymer stirrups were subjected to fatigue tension and shear,and failed owing to shear.

关键词： fatigue shear hybrid stirrups hybrid reinforcement fiber-reinforced polymer

Model of Underground Ant Nest Structure Using Static and Dynamic Finite Element Analysis

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Acta Mechanica Solida Sinica 2018年第6期31卷 717-730页

作者： wenjun qu Wei Zhou Peng Zhu Zhi Zhang Department of Structural Engineering Tongji University Shanghai 200092 China The High School Affiliated with Shanghai University Shanghai 200444 Chinch

This paper focuses on the structural characteristics of ant nests,which are complex structures.Natural underground ant nests generally have good air circulation,pressure resistance, waterproof properties,thermal insulation and a favorable temperature and relative humidity. Additionally,ant nests are often surrounded by trees and other natural barriers.In this study, the natural underground ant nests of Iridomyrmex anceps were gathered from different collection sites.Manual cutting and frozen computer numerical control milling were performed on the ant nests in a laboratory.The internal structure of each nest was measured and recorded,and then, the 2D and 3D numerical structure models of the Iridomyrmex anceps nest were created.The static and dynamic simulation analysis of an underground ant nest structure was performed by using finite element analysis software (ABAquS),and the mechanical properties of the ant nest were discussed.The underground ant nest structure effectively resisted the additional stress due to external static and live loads,and the ant nest was not completely destroyed.

关键词： Underground ant nest Iridomyrmex anceps Frozen CNC milling Finite element analysis Static simulation Dynamic simulation

New Re-Os Isotopic Constrains on the Formation of the Metalliferous Deposits of the Lower Cambrian Niutitang Formation

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Journal of Earth Science 2016年第2期27卷 271-281页

作者： Yong Fu Lin Dong Chao Li wenjun qu Haoxiang Pei Wenlang Qiao Bing Shen College of Resource and Environmental Engineering Guizhou University Guiyang 550012 China Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Key Laboratory of Orogenic Belts and Crustal Evolution MOE School of Earth and Space Science Peking University Beijing 100871 China Re-Os lab National Research Center for Geoanalysis Chinese Academy of Geological Sciences Beijing 100037 China Institute of Guizhou Geological Survey Guiyang 550004 China

The Terreneuvian Epoch（541-521 Ma）is also an important period for metallogenesis in South China, as was represented by the widespread occurrences of Ni-Mo polymetallic layers on the antecedent shallow platform margin and the V-enriched black shales in deeper slope-basin settings. In this study, we have measured Re-Os isochron ages of Ni-Mo polymetallic layers（Songlin, Niuchang, Sancha, Chuanpengwan）, V-rich black shales（Bahuang）, and non-metalliferous black shales（Shuidong） in the basal Niutitang Formation in Guizhou and Hunan province, South China. The Ni-Mo polymetallic layers and V-enriched black shales have similar Re-Os isochron ages, suggesting concurrent deposition of these two types of metalliferous ores. This suggestion is consistent with the traditional stratigraphic correlation by using the nodular phosphorite bed directly underlying these metalliferous layers as a stratigraphic marker. Furthermore, the metalliferous ores and non-metalliferous black shales have similar initial ^（187）Os/^（188） Os ratios of 0.8-0.9, arguing for a dominant seawater origin with minor contribution of hydrothermal activity. Furthermore, Re-Os isotopic data also imply that Ni-Mo and V ore might have derived from the same source. We suggest that the spatial distribution of metalliferous ores can be explained by the development of non-sulfidic anoxic-suboxic wedge（NSASW） in the slope-basin and sulfidic wedge in the previous platform margin. Upwelling of deep water first transects the mildly reduced, organic rich NSASW, in which V（V） is reduced to V（IV）, and is preferentially removed from seawater by organometallic complex formation. As a result, V-rich black shale deposits in the slope-basin of Yangtze Platform. Further movement of deep water into the sulfidic platform margin results in Ni-Mo polymetallic layer formation.

关键词： Niutitang Formation South China Ni-Mo polymetallic layer V-rich black shale Re-Osisochron ages.

新民主主义革命时期中国共产党政治忠诚培育及经验研究

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浙江理工大学学报（社会科学版） 2024年第3期52卷 336-343页

作者：汤文俊渠长根浙江开放大学机关党总支杭州310012 浙江理工大学马克思主义学院杭州310018

马克思主义政治观蕴含着忠诚于共产主义、忠诚于无产阶级政党、忠诚于劳动人民、忠诚于国家等政治忠诚思想。新民主主义革命时期,中国共产党继承和发展了马克思主义政治忠诚思想,中国共产党在这一历史时期的政治忠诚内容包括对党忠诚、... 详细信息

马克思主义政治观蕴含着忠诚于共产主义、忠诚于无产阶级政党、忠诚于劳动人民、忠诚于国家等政治忠诚思想。新民主主义革命时期,中国共产党继承和发展了马克思主义政治忠诚思想,中国共产党在这一历史时期的政治忠诚内容包括对党忠诚、坚定马克思主义信仰、投身人民解放事业和为工农群众服务。党通过强化党性教育、加强基层组织建设、进行马克思主义学习宣传以及领导农村土地革命,不断培育共产党员的政治忠诚。新民主主义革命时期中国共产党的政治忠诚建设经验,为新时代加强党员政治忠诚教育和党的建设提供了有益借鉴。

关键词：新民主主义革命时期中国共产党政治忠诚马克思主义对党忠诚

芍药甘草颗粒对斑秃样小鼠毛发生长、行为学及下丘脑-垂体-肾上腺轴的影响

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中国比较医学杂志 2024年第5期34卷 46-54页

作者：曲保全吕书影林文君杨顶权北京中医药大学北京100029 首都医科大学附属北京中医医院北京100010 中日友好医院北京100029

目的探讨芍药甘草颗粒对斑秃样小鼠毛发生长、行为学及下丘脑-垂体-肾上腺轴的影响。方法C3H/HeJ小鼠42只,随机分为空白对照组、模型组、芍药甘草颗粒高、中、低剂量组、促肾上腺皮质激素释放激素1型受体拮抗剂组、复方甘草酸苷片组,每... 详细信息

目的探讨芍药甘草颗粒对斑秃样小鼠毛发生长、行为学及下丘脑-垂体-肾上腺轴的影响。方法C3H/HeJ小鼠42只,随机分为空白对照组、模型组、芍药甘草颗粒高、中、低剂量组、促肾上腺皮质激素释放激素1型受体拮抗剂组、复方甘草酸苷片组,每组6只,分别予以不同药物干预。进行照片和毛发镜拍摄、体重称量、行为学测定,以及促肾上腺皮质激素释放激素、促肾上腺皮质激素、皮质醇、糖皮质激素受体、脑源性神经营养因子检测。结果与模型组比较,高剂量芍药甘草颗粒可加速斑秃样小鼠毛发再生及体重增长(P<0.05),增加旷场实验运动总路程及中央区运动路程占总路程百分比(P<0.05),减少强迫游泳实验及悬尾实验不动时间(P<0.05),降低外周血促肾上腺皮质激素释放激素、促肾上腺皮质激素、皮质醇水平(P<0.05),增加海马体糖皮质激素受体及脑源性神经营养因子表达(P<0.05)。结论芍药甘草颗粒能促进斑秃样小鼠毛发生长、改善其行为学表现,其作用的发挥可能与下调促肾上腺皮质激素释放激素、促肾上腺皮质激素、皮质醇水平,上调糖皮质激素受体、脑源性神经营养因子表达,抑制下丘脑-垂体-肾上腺轴过度活化相关。

关键词：芍药甘草颗粒斑秃下丘脑-垂体-肾上腺轴

IMLS《2018-2022战略规划》与《2022-2026战略规划》的对比分析及对我国图书馆事业发展的思考

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图书馆杂志 2024年第2期43卷 12-21,48页

作者：高春玲张熙茁沈文君曲悠扬辽宁师范大学管理学院辽宁大连116029 辽宁医药职业学院图书馆

文章采用网络调研法,对美国博物馆和图书馆服务署《2018–2022战略规划》与《2022–2026战略规划》进行内容分析和解读,研究发现,《2022–2026战略规划》在主张终身学习、强化基层参与、科技赋能馆藏建设、全方位优化公共服务提供水平... 详细信息

文章采用网络调研法,对美国博物馆和图书馆服务署《2018–2022战略规划》与《2022–2026战略规划》进行内容分析和解读,研究发现,《2022–2026战略规划》在主张终身学习、强化基层参与、科技赋能馆藏建设、全方位优化公共服务提供水平等主要内容上具有显著变化。借鉴其经验,我国在发展图书馆事业的过程中,可从(1)发布贴近图书馆事业发展的预算规划,提高财政经费利用效率;(2)承担图书馆社会教育使命,响应全球终身教育号召;(3)推进馆藏数字化和文化遗产保护,共塑民族记忆;(4)重视数据公开和成果转化,提升服务效能;(5)强化行业内、行业间合作,畅通交流渠道方面寻求进步,以提供更为优质的公共文化服务。

关键词：美国博物馆和图书馆服务署战略规划公共图书馆

Surface protection method for the magnetic core using covalent organic framework shells and its application in As(Ⅲ)depth removal from acid wastewater

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Journal of Environmental Sciences 2022年第5期34卷 1-9页

作者： wenjun Huang Haomiao Xu Xiaoshuang Liu Longlong Wang Shutang Li Leipeng Ji Zan qu Naiqiang Yan School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Fe_(3)O_(4)-based materials are widely used for magnetic separation from wastewater.However,they often suffer from Fe-leaching behavior under acidic conditions,decreasing their ac-tivity and limiting sustainable practical applications.In this study,covalent organic frame-works(COFs)were used as the shell to protect the Fe_(3)O_(4) core,and the Fe_(3)O_(4)@COF core-shell composites were synthesized for As(Ⅲ)removal from acid wastewater.The imine-linked COFs can in situ grow on the surface of the Fe_(3)O_(4) core layer by layer with[COFs/Fe_(3)O_(4)]mol ratio of up to 2∶1.The Fe-leaching behavior was weakened over a wide pH range of 1-13.Moreover,such composites keep their magnetic characteristic,making them favorable for nanomaterial separation.As(Ⅲ)batch adsorption experiments results indicated that,when COFs are used as the shell for the Fe_(3)O_(4) core,a balance between As(Ⅲ)removal efficiencies and the thickness of the COF shell exists.Higher As(Ⅲ)removal efficiencies are obtained when the[COFs/Fe_(3)O_(4)]mol ratios were<1.5∶1,but thicker COF shells were not beneficial for As(Ⅲ)removal.Such composites also exhibited better As(Ⅲ)removal performances in the pH range of 1-7.Over a wide pH range,the zeta potential of Fe_(3)O_(4)@COF core-shell compos-ites becomes more positive,which benefits the capture of negative arsenic ions.In addition,thinner surface COFs were favorable for mass transfer and facilitating the reaction of Fe and As elements.Our study highlights the promise of using COFs in nanomaterial surface protection and achieving As(Ⅲ)depth removal under acidic conditions.

关键词： Arsenic ions Covalent Organic Framework Core-shell structure Surface protectionLayer Thickness

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大语言模型评估技术研究进展

数据采集与处理 2024年第3期39卷 502-523页

作者：赵睿卓曲紫畅陈国英王坤龙徐哲炜柯文俊汪鹏北京计算机技术及应用研究所北京100854 东南大学计算机科学与工程学院南京211189

随着大语言模型的广泛应用,针对大语言模型的评估工作变得至关重要。除了大语言模型在下游任务上的表现情况需要评估外,其存在的一些潜在风险更需要评估,例如大语言模型可能违背人类的价值观并且被恶意输入诱导引发安全问题等。本文通... 详细信息

随着大语言模型的广泛应用,针对大语言模型的评估工作变得至关重要。除了大语言模型在下游任务上的表现情况需要评估外,其存在的一些潜在风险更需要评估,例如大语言模型可能违背人类的价值观并且被恶意输入诱导引发安全问题等。本文通过分析传统软件、深度学习模型与大模型的共性与差异,借鉴传统软件测评和深度学习模型评估的指标体系,从大语言模型功能评估、性能评估、对齐评估和安全性评估几个维度对现有工作进行总结,并对大模型的评测基准进行介绍。最后依据现有研究与潜在的机遇和挑战,对大语言模型评估技术方向和发展前景进行了展望。

关键词：大语言模型功能评估性能评估对齐评估安全性评估

Enhanced simultaneous absorption of NO_(x) and SO_(2) in oxidation-reduction-absorption process with a compounded system based on Na_(2)SO_(3)

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Journal of Environmental Sciences 2022年第1期34卷 1-10页

作者： Sichao Li wenjun Huang Haomiao Xu Kai Liu Jia-nan Wang Yaning Sun Zan qu Naiqiang Yan School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Jinan Motor Vehicle Pollution Prevention and Control Center(Jinan Ecological Environment Information Center) Jinan 250000China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Oxidation of sulfite and competitive absorption existed in Na_(2)SO_(3) solution for simultaneous removal of NO_(x) and SO_(2),inhibited the long-term high-efficiency when used for practical applications.A matching strategy was developed to solve these problems.Antioxidants combination was used to retard the oxidation of antioxidant and enhance inhibition of S(IV)(tetravalent sulfur)oxidation.Hydroquinone(HQ)and sodium thiosulfate(ST)showed a positive synergistic effect on inhibition of S(IV)oxidation.When SO_(2) concentration was 500 and 2000 ppmV,the addition of 0.1 wt.%HQ and 1 wt.%ST decreased the percentage of S(IV)oxidized by oxygen by over 30%and 40%,respectively.Alkali(Na_(2)CO_(3))alleviated the competitive absorption between NO_(x) and SO_(2).Moreover,Na_(2)CO_(3) exhibited an enhancement effect on the absorption of NO_(x) and SO_(2) when coupled with anti-oxidants.While the increase of oxygen pressure accelerated the oxidation of S(IV),the anti-oxidants can retard the oxidation.The measurement of pH suggested the removal efficiency of NO_(x) highly depended on SO_(3)^(2-) concentration rather than pH.The further investigation of the mechanism suggested the match effect was related to the interaction between ST and the intermediate product of HQ.The match strategy holds a potential for application of SO_(3)^(2-) to denitration.

关键词： Denitration Non-ferrous metal smelting flue gas Oxidation inhibition Oxidation-reduction-absorption Synergistic effect