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预制-后浇型混凝土双面叠合连梁受剪性能研究

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武汉理工大学学报 2024年第4期46卷 47-55页

作者：汤明生谷倩吴兴民王翔程健飞田水武汉理工大学土木工程与建筑学院武汉430070

为更好满足建筑工业化要求,基于叠合剪力墙结构体系提出一种预制-后浇型混凝土双面叠合连梁,该叠合连梁可与叠合墙肢在工厂整体预制,为提高生产效率,采用钢筋桁架替代箍筋作为抗剪钢筋。对5根连梁进行受剪性能试验,包括3根新型双面叠合... 详细信息

为更好满足建筑工业化要求,基于叠合剪力墙结构体系提出一种预制-后浇型混凝土双面叠合连梁,该叠合连梁可与叠合墙肢在工厂整体预制,为提高生产效率,采用钢筋桁架替代箍筋作为抗剪钢筋。对5根连梁进行受剪性能试验,包括3根新型双面叠合连梁(剪跨比λ分别为1.2.1.5,1.8)、1根叠合连梁以及1根现浇对比连梁。结果表明,所有连梁均发生剪压破坏。双面叠合连梁的受剪承载力、位移延性系数分别为现浇连梁的81.3%、92.3%,同时观察到极限破坏时叠合面未出现相对滑移,钢筋桁架的上、下弦筋均发生屈服。随着剪跨比增大,双面叠合连梁受剪承载力降低但变形能力提高。基于ABAQUS有限元软件建立了精细化数值模型,计算结果与试验结果拟合良好。参数分析表明,双面叠合连梁预制板完全由箍筋连接时较完全由钢筋桁架连接时,受剪承载力提高了10.0%,极限挠度提高了2..3%,增大预制-后浇混凝土叠合面摩擦系数可有效提高新型连梁的受剪承载力。

关键词：混凝土双面叠合连梁钢筋桁架受剪性能剪跨比数值模拟

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风荷载作用下中空玻璃的挠度研究

工业建筑 2024年第10期54卷 153-159页

作者：潘应桂田水谷倩梅裕安胡飞成鹏武汉理工大学土木工程与建筑学院武汉430070 中建三局集团有限公司工程总承包公司武汉430070

利用静力平衡方程,求解了外荷载作用下双模量矩形玻璃的中面位置,考虑了单层玻璃受力时的中面拉力;同时研究了外荷载作用下中空玻璃空腔体积改变与空腔内气体压强的关系;利用静力平衡方程、几何变形方程及物理方程,推导出了内、外层玻... 详细信息

利用静力平衡方程,求解了外荷载作用下双模量矩形玻璃的中面位置,考虑了单层玻璃受力时的中面拉力;同时研究了外荷载作用下中空玻璃空腔体积改变与空腔内气体压强的关系;利用静力平衡方程、几何变形方程及物理方程,推导出了内、外层玻璃的挠度微分方程,建立了反映中空玻璃内、外层之间传力性能的中空玻璃的挠度计算公式,并将考虑中空玻璃内、外层之间传力的理论计算结果、规范公式计算结果与有限元计算结果进行比较。研究结果表明:考虑中空玻璃内、外层之间传力的理论计算结果是可靠的。

关键词：中空玻璃中面空腔挠度

The intestinal microbiome of an Indo-pacific humpback dolphin(Sousa chinensis)stranded near the pearl river Estuary,china

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Integrative Zoology 2021年第3期16卷 287-299页

作者： Xiaoling WAN Jia LI Zhaolong cheng Mengxue AO renmao tian richard William MCLAUGHLIN Jinsong ZHENG Ding WANG The Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences Institute of HydrobiologyChinese Academy of SciencesWuhanChina university of Chinese Academy of Sciences BeijingChina Yellow Sea Fisheries research Institute Chinese Academy of Fishery SciencesQingdaoChina Institute for Environmental Genomics Department of Microbiology and Plant BiologySchool of Civil Engineering and Environmental SciencesUniversity of OklahomaNormanOklahomaUSA Institute for Food Safety and Health Illinois Institute of TechnologyBedford ParkIllinoisUSA General Studies Gateway Technical CollegeKenoshaWisconsinUSA

The mammalian intestinal microbiome is critical for host health and disease ***,the cetacean intestinal microbiota remains relatively *** using high-throughput 16S rrNA gene sequencing,we analyzed intestinal bacterial samples from an Indo-pacific humpback dolphin(Sousa chinensis)stranded near the pearl river Estuary in *** samples included 3 anatomical regions(foregut,midgut,and rectum)and 2.anatomical locations(content and mucus).Our analyses revealed that the dolphin intestinal bacteria contained 139 operational taxonomic units(OTUs),dominated at the phyla level by Firmicutes(47.05%in the content;94.77%in the mucus),followed by Bacteroidetes(2..63%in the content;1.58%in the mucus)and Gammaproteobacteria(14.82.in the content;2.05%in the mucus).The intestinal bacteria had a small core community(15 OTUs,accounting for 99.74%of the reads),some of which could be potentially pathogenic to both human and *** an alternative to sampling the dolphin intestinal bacteria,fecal sampling could be ***,function potentials such as,xenobiotics biodegradation,beta-lactam resistance,and human disease-related pathways,were detected in the dolphin intestinal *** findings provide the first baseline knowledge of the intestinal microbiome of the Indo-pacific humpback dolphin,which may offer new insights into cetacean conservation by using microbial surveillance.

关键词： 16S rrNA gene high-throughput sequencing anthropogenic impact cetacean indo-pacific humpback dolphin intestinal microbiota

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大粒径级配碎石的永久变形研究及模型预测

武汉理工大学学报 2024年第2期46卷 36-43页

作者：伍阳程春谭波粟友良李杰敏广西交通技师学院交通工程系南宁530001 桂林理工大学土木工程学院桂林541004 广西绿色建材与建筑工业化重点实验室桂林541004

为了研究大粒径级配碎石在循环重复荷载作用下的永久变形规律,对大粒径级配碎石混合料开展循环压实试验,研究含水量、级配、重复荷载对大粒径级配碎石累积变形的影响,引入灰色关联理论,通过计算各因素的灰色关联度,确定各因素对永久变... 详细信息

为了研究大粒径级配碎石在循环重复荷载作用下的永久变形规律,对大粒径级配碎石混合料开展循环压实试验,研究含水量、级配、重复荷载对大粒径级配碎石累积变形的影响,引入灰色关联理论,通过计算各因素的灰色关联度,确定各因素对永久变形的影响程度。试验结果表明:当荷载低于2.0kpa时,大粒径级配碎石混合料处于塑性安定状态,当荷载在2.0~300kpa时,试样变形将缓慢累积,试样处于塑性蠕变状态;根据灰色关联分析结果,大粒径级配碎石混合料的永久变形受级配的影响最大,其次是压实荷载和含水量;最后基于试验结果,提出了一种更适用于大粒径级配碎石的累积变形预测模型。

关键词：大粒径级配碎石永久变形灰色关联分析模型预测路基路面

Establishment of a sediment transport capacity equation on loessal slope via experimental investigation

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International Journal of Sediment research 2023年第2期38卷 166-174页

作者： tian Wang Jingsi Li Jingming Hou peng Li Shengdong cheng Feng Wang Wen Wang Zhanbin Li reinhard Hinkelmann State Key Laboratory of Eco-hydraulics in Northwest Arid region of china Xi'an University of Technology Chair of Water resources Management and Modeling of Hydrosystems Department of Civil Engineering Technische Universit at Berlin Shaanxi province Institute of Water resources and Electric power Investigation and Design Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster prevention in Arid regions Xi'an University of Technology

Areliable sediment transport capacity function provides response against challenges of soil erosion prediction on the Loess plateau of china. The popular sediment transport capacity functions are questionable on loess slopes because the experimental conditions from which they were derived, like bed materials, gentle slopes,and surface roughness, are different from soil erosion processes on the loess slopes. Due to the foregoing uncertainty, a suitable sediment transport capacity function was developed based on a flume experiment investigation. The erodible bed experiment was implemented for five unit width discharges(1.3 × 10-4-3.3 × 10-4m2.s) and ten slopes(5.2.-57.7%). The selected sediment transport capacity equations were tested in an applicability evaluation. The results of this evaluation found that the Govers(1990) function had the best performance(p.O.0.5-2.0= 76%, r2. 0.93, rMSE = 0.03 kg/(m·s)), followed by the Yalin(1963) function(p.O.0.5-2.0= 80%, r2. 0.81, rMSE = 0.05 kg/(m·s)), and finally by the Low(1989) function(p.O.0.5-2.0= 72.,r2. 0.79, rMSE = 0.04 kg/(m·s)), where p.O.0.5-2.0is the percentage of estimated values with logarithmic discrepancies with the measured value between 0.5 and 2.0; r2.s the coefficient of determination and rMSE is the roof mean squares error. The cohesive sediment incipient motion velocity is introduced into the Govers(1990) function, and the sediment particle parameter is determined from measured experimental data. The developed sediment transport capacity equation has good performance with predicted values corresponding to measured values(p.O.0.5-2.0= 98%, r2. 0.98, rMSE = 0.006 kg/(m·s)). The research results provide an improved sediment transport capacity function on the basis of experiments for steep loessal slopes.

关键词： Experimental investigation Hydraulic conditions Loessal slope Sediment transport capacity

小叶买麻藤茎化学成分及其黄嘌呤氧化酶抑制活性研究

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中成药 2024年第9期46卷 2994-2999页

作者：陈倩张正宽骆田田曾爱芬徐国波朱勤凤廖尚高贵州医科大学药学院/省部共建药用植物功效与利用国家重点实验室贵州贵阳550025 教育部民族药与中药开发应用工程研究中心/贵州省药物制剂重点实验室贵州贵阳550025

目的研究小叶买麻藤Gnetum parvifolium(Warb.)*** ex chun茎的化学成分及其黄嘌呤氧化酶抑制活性。方法小叶买麻藤茎95%乙醇提取物采用硅胶、MCI、制备HpLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用紫外分光光... 详细信息

目的研究小叶买麻藤Gnetum parvifolium(Warb.)*** ex chun茎的化学成分及其黄嘌呤氧化酶抑制活性。方法小叶买麻藤茎95%乙醇提取物采用硅胶、MCI、制备HpLC进行分离纯化,根据理化性质及波谱数据鉴定所得化合物的结构。采用紫外分光光度法测定黄嘌呤氧化酶的抑制活性。结果从中分离得到17个化合物,分别鉴定为异单叶大黄素(1)、白藜芦醇(2.、对羟基苯甲醛(3)、环桉树醇(4)、(E)-1-(3′,5′-dimethoxyphenyl)-2.(3,4-dimethoxyphenyl)ethene(5)、豆甾-4-烯-3-酮(6)、medioresinol(7)、白杨素(8)、金色酰胺醇酯(9)、(-)-松脂醇(10)、对羟基苯甲酸酯(11)、2.甲氧基对苯二酚(12.、gnetumontain C(13)、丁香脂素(14)、高圣草素(15)、香草醛(16)、β-谷甾醇(17)。化合物1~3、15~16的IC_(50)值分别为(11.4±0.54)、(14.1±1.06)、(32..4±0.75)、(360.6±0.78)、(386.3±0.71)μmol/L。结论化合物3~4为首次从该植物中分离得到,化合物5~13为首次从买麻藤属植物中分离得到。化合物1~3、15~16具有黄嘌呤氧化酶抑制活性。

关键词：小叶买麻藤茎化学成分分离鉴定黄嘌呤氧化酶

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菱铁矿热分解产物及其变化规律的研究

湘潭矿业学院学报 2002年第1期17卷 55-57,82页

作者：张迎春杨秀红施倪承马哲生王英哲黑龙江科技学院土木工程系黑龙江鸡西158105 中国地质大学材料系北京100083

在空气环境下对天然菱铁矿进行热处理 ,XrD分析结果表明菱铁矿热分解产物变化非常复杂 ,其分解产物主要与热处理温度、保温时间及样品本身的结构特征有关 ;随着温度的升高 ,其产物出现的顺序为磁铁矿、磁赤铁矿、赤铁矿 .菱铁矿热分解... 详细信息

在空气环境下对天然菱铁矿进行热处理 ,XrD分析结果表明菱铁矿热分解产物变化非常复杂 ,其分解产物主要与热处理温度、保温时间及样品本身的结构特征有关 ;随着温度的升高 ,其产物出现的顺序为磁铁矿、磁赤铁矿、赤铁矿 .菱铁矿热分解的最终产物是赤铁矿 ,磁铁矿和磁赤铁矿作为菱铁矿分解的中间产物在一定的温度区间稳定存在 .图 3,表2.,参

关键词：菱铁矿热处理分解产物 XrD 空气环境赤铁矿磁铁矿

Association of Meteorological Factors with Labial Adhesions in Children: A 7-year retrospective Analysis with 9,467 Cases

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Biomedical and Environmental Sciences 2019年第9期32卷 715-718页

作者： ZHAO tian Xin LUO Qing WANG Jun Ke HAN Lin Dong WEI Yue Xin SUN Mang LIU Bin SHEN Lian Ju LONG chun Lan YU {2. Jun LIN Tao WU Sheng De WEI Guang Hui Department of Urology Children's Hospital of Chongqing Medical University Chongqing Key Laboratory of Children Urogenital Development and Tissue engineering Ministry of Education Key Laboratory of Child Development and Disorders National Clinical research Center for Child Health and Disorders(Chongqing china International Science and technology Cooperation Base of Child Development and Critical Disorders Chongqing Key Laboratory of pediatrics

Labial adhesions (LA)(also called labial agglutination) are defined as partial or complete agglutination of labia minora. The condition commonly occurs in girls during childhood with an estimated prevalence of 0.6%–5%and a peak incidence in the age-group of 13–2. months[1]. Over half of all patients present with symptoms related to urinary outlet obstruction[2..

关键词： urinary obstruction outlet

Spatio-temporal analysis and simulation on shallow rainfall-induced landslides in china using landslide susceptibility dynamics and rainfall I-D thresholds

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Science china Earth Sciences 2017年第4期60卷 720-732页

作者： LI WeiYue LIU chun Marco SCAIONI SUN WeiWei CHEN Yu YAO DongJing CHEN Sheng HONG Yang ZHANG KaiHang cheng GuoDong Institute of Urban Study Shanghai Normal University Shanghai 200234 China Cold and Arid region Environmental and engineering research Institute Chinese Academy of Sciences Lanzhou 730000 China College of Surveying and Geo-Informatics Tongji University Shanghai 200234 China Department of Architecture Built Environment and Construction Engineering Politecnico Milano Milano 20133 Italy College of Architectural engineering Civil Engineering and Environment Ningbo University Ningbo 315211 China Shandong Academy of Building research Jinan 250031 China Department of Geography Shanghai Normal University Shanghai 200234 China School of Atmospheric Sciences Sun Yat-sen University Guangzhou 510275 China Key Laboratory of Beibu Gulf Environmental Evolution and resources Utilization Guangxi Teachers Education University Nanning 530001 China School of civil engineering and Environmental Sciences University of Oklahoma OK 73074 USA Department of Hydraulic engineering Tsinghua University Beijing 100084 China Institute of Tourism Shanghai Normal University Shanghai 200234 China

An empirical simulation method to simulate the possible position of shallow rainfall-induced landslides in china has been *** study shows that such a simulation may be operated in real-time to highlight those areas that are highly prone to rainfall-induced landslides on the basis of the landslide susceptibility index and the rainfall intensity-duration(I-D) ***,the study on landslide susceptibility in china is *** entire territory has been classified into five categories,among which high-susceptibility regions(Zone 4-'High' and 5-'Very high') account for 4.15%of the total extension of ***,rainfall is considered as an external triggering factor that may induce landslide ***-time satellite-based TMpA3B42.products may provide real rainfall spatial and temporal patterns,which may be used to derive rainfall duration time and *** using a historical record of 60 significant past landslides,the rainfall I-D equation has been *** rainfall duration time that may trigger a landslide has resulted between 3 hours and 45 *** combination of these two aspects can be exploited to simulate the spatiotemporal distribution of rainfall-induced landslide hazards when rainfall events exceed the rainfall I-D thresholds,where the susceptibility category is 'high' or 'very high'.This study shows a useful tool to be part of a systematic landslide simulation methodology,potentially providing useful information for a theoretical basis and practical guide for landslide prediction and mitigation throughout china.

关键词： Surface and subsurface runoff runoff-produced physical and chemical deposits precipitated salts and water circulation Groundwater supply mechanism Badain Jaran Desert