检索结果-南通市图书馆

Seismic responses of an intensively constructed metro station-passageway-shaft structure system

Frontiers of Structural and Civil Engineering 2024年第5期18卷 760-775页

作者： Ruohan li yong YUAN hong CHEN Xinxing li Emilio BILOTTA Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Department of Civil Architectural and Environmental EngineeringUniversity of Naples Federico IINaples 80125Italy State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Shanghai Tunnel Engineering&Rail Transit Design and Research Institute Shanghai 200235China

Intensive construction methods offer benefits for metro station development,yet they present challenges for seismic design due to the spatially asymmetric configuration of passageway-shaft *** this study,a detailed numerical model of a station-passageway-shaft structure system built using intensive construction methods was developed and the deformation and damage modes under seismic loadings were *** results indicate that inconsistent deformation between the shaft and the station generates interaction through the connecting passageway,leading to damage near the opening of the station structure and both ends of the connecting passageway Damage is more severe under longitudinal *** with the opening plan that spans four segments,the opening plan that spans five segments exacerbates the overall degree of damage to the structure *** transverse excitation,the presence of interior structures intensifies the damage to the station and connecting passageway,while with such internal structure in place the impact is relatively minor under longitudinal *** with steel segments near the station opening can appreciably attenuate the *** contrast,introducing flexible joints at both ends of the connecting passageway intensifies the ***,reinforcement using steel segments emerges as an optimal seismic mitigation strategy.

关键词： earthquake intensive construction metro station numerical simulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis and Herbicidal Activity of Novel Sulfonylureas Containing Thiadiazol Moiety

引用

Chemical Research in Chinese Universities 2008年第1期24卷 32-35页

作者： GUO Wan-cheng liU Xing-hai li yong-hong WANG Su-hua li Zheng-ming Institute of Elemento-Organic Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 P. R. China

Thirteen novel sulfonylureas containing thiadiazole moiety were synthesized in a two-step reaction. Their structures were determined using IR, ^1H NMR, HRFTMS, and elemental analysis. Herbicidal activities of these compounds were determined in the green house bio-assay. The results show that four compounds among them exhibit some activity toward four tested herbs.

关键词： Sulfonylurea Synthesis Herbicidal activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Herbicidal Activity of Novel Sulfonylurea Derivatives

引用

Chemical Research in Chinese Universities 2011年第1期27卷 60-65页

作者： CAO Gang WANG Mei-yi WANG Ming-zhong WANG Su-hua li yong-hong li Zheng-ming State Key Laboratory of Elemento-Organic Chemistry Research institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 P. R. China College of Chemistry and Chemical Engineering North University for Ethnics Yinchuan 750021 P. R. China

Sulfonylurea herbicides have been applied worldwide in agriculture. Some sulfonylurea residues might exist in soil longer than that people expected. However, flupyrsulfuron-methyl-sodium which was firstly reported as a new 5-substituted sulfonylurea herbicide has less than one month residual life. Therefore, 5-substituted benzenesulfonylureas are potential molecules to regulate its residual situation. In order to develop new sulfonylurea derivatives, the substituent on the critical 5-posotion of the benzene ring was optimized. On the basis of our former work on sulfonylureas which contains a characteristic mono-substituted pyrimidine moiety, twenty-six new sulfonylurea deriva- tives were synthesized and their structures were confirmed by 1H NMR, 31p NMR and elemental analysis. The greenhouse bioassay tests show that some title compounds exhibit potent herbicidal activity.

关键词： Sulfonylurea 5-Substituted phenyl ring Herbicidal activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Evapotranspiration on Mitigation of Urban Temperature by Vegetation and Urban Agriculture

引用

Journal of Integrative Agriculture 2013年第8期12卷 1307-1315页

作者： QIU Guo-yu li hong-yong ZHANG Qing-tao CHEN Wan liANG Xiao-jian li Xiang-ze Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and EnergyShenzhen Graduate SchoolPeking University

The temperature difference between an urban space and surrounding non-urban space is called the urban heat island effect （UHI）. Global terrestrial evapotranspiration （ET） can consume 1.4803x1023joules （J） of energy annually, which is about 21.74% of the total available solar energy at the top of atmosphere, whereas annual human energy use is 4.935× 1020 J, about 0.33% of annual ET energy consumption. Vegetation ET has great potential to reduce urban and global temperatures. Our literature review suggests that vegetation and urban agricultural ET can reduce urban temperatures by 0.5 to 4.0℃. Green roofs （including urban agriculture） and water bodies have also been shown to be effective ways of reducing urban temperatures. The cooling effects on the ambient temperature and the roof surface temperature can be 0.24-4.0℃ and 0.8-60.0℃, respectively. The temperature of a water body （including urban aquaculture） can be lower than the temperature of the surrounding built environment by between 2 and 6℃, and a water body with a 16 m2 surface area can cool up to 2 826 m3 of nearby space by 1℃. Based on these findings, it can be concluded that the increase of evapotranspiration in cities, derived from vegetation, urban agriculture, and water body, can effectively mitigate the effect of urban heat islands.

关键词： evapotranspiration urban heat island vegetation temperature

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

首批1型单纯疱疹病毒溶瘤活性测定国家候选标准品的研制

引用

药物分析杂志 2024年第4期44卷 663-670页

作者：秦玺胡金盼李永红史新昌丁有学毕华韩春梅郑红梅饶春明梁成罡中国食品药品检定研究院北京100050 厦门大学公共卫生和生命科学学院厦门361005

目的:研制首批1型单纯疱疹病毒(herpes simplex virus 1,HSV-1)溶瘤活性测定国家标准品。方法:按2020年版《中华人民共和国药典》三部相关要求,分别进行HSV-1溶瘤活性测定液体标准品和冻干标准品的制备和质量检测,并使用热加速试验进行... 详细信息

目的:研制首批1型单纯疱疹病毒(herpes simplex virus 1,HSV-1)溶瘤活性测定国家标准品。方法:按2020年版《中华人民共和国药典》三部相关要求,分别进行HSV-1溶瘤活性测定液体标准品和冻干标准品的制备和质量检测,并使用热加速试验进行稳定性考察,以U-2 OS细胞/CCK-8法分别在3家实验室对标准品的溶瘤活性进行协作标定。对比研究液体标准品和冻干标准品,选择其中更为适用的1种作为国家标准品。结果:制备的2种HSV-1溶瘤活性测定标准品的质量检测结果均符合要求,其中冻干标准品水分含量为1.09%,分装精度为0.15%。稳定性试验结果用阿伦尼乌斯公式计算,初步预测液体标准品溶瘤活性在-70℃下降低10%需7.7年;冻干标准品溶瘤活性在-70℃下降低10%需6.1×10^(5)年,其稳定性得到很大提高。3个实验室协作标定进行了共21次测定,液体标准品的溶瘤活性值几何均数为7.08×10^(4)U·mL^(-1),冻干标准品的溶瘤活性值几何均数为1.82×10^(4)U·支^(-1)。HSV-1标准品原液在冻干后溶瘤活性由7.08×10^(4)U·mL^(-1)下降至3.03×10^(4)U·mL^(-1),但因其溶瘤活性在预稀释100倍后仍然出现良好的S型量效关系曲线,并不影响它作为标准品使用的要求。将液体标准品作为样品,用冻干标准品作为标准品进行校准后,3家实验室结果的几何变异系数(GCV)由64.4%下降到29.2%,实验的精密度得到较大提高。结论:该批HSV-1溶瘤活性测定冻干标准品各项指标均符合相关要求,与液体标准品相比更适合作为国家标准品使用,其溶瘤活性赋值为1.82×10^(4)U·支^(-1)。

关键词： 1型单纯疱疹病毒(HSV-1) U-2 OS细胞/CCK-8法溶瘤活性标准品冻干稳定性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

脉冲星J2313+4253的周期性消零和奇偶调制特性的研究

引用

中国科学：物理学、力学、天文学 2024年第4期54卷 185-198页

作者：陈建玲温志刚王洪光王娜袁建平 Rai Yuen 闫文明韩伟李永宏王金鹏项斌斌运城学院物理与电子工程系运城044000 中国科学院新疆天文台乌鲁木齐830011 广州大学天体物理中心广州510006 新疆大学机电工程学院乌鲁木齐830017

脉冲星子脉冲的强度调制特征对揭示脉冲星辐射过程和磁层几何具有重要意义.前人研究表明,PSR J2313+4253的单脉冲序列具有44倍和2倍自转周期的强度调制.其中2倍周期的调制周期被称为奇偶性调制,其物理起源并不清晰.本文利用佳木斯66 m... 详细信息

脉冲星子脉冲的强度调制特征对揭示脉冲星辐射过程和磁层几何具有重要意义.前人研究表明,PSR J2313+4253的单脉冲序列具有44倍和2倍自转周期的强度调制.其中2倍周期的调制周期被称为奇偶性调制,其物理起源并不清晰.本文利用佳木斯66 m射电望远镜的观测数据,对脉冲星J2313+4253在2250 MHz的单脉冲辐射特性进行了详细研究.通过相位分离涨落谱(LRFS)、谐频分离的涨落谱(HRFS)和二维涨落谱(2DFS)的分析方法,发现PSR J2313+4253的奇偶性调制来自于其短周期子脉冲漂移,并且调制现象展现出了时间依赖性.分析表明,旋转木马模型下,奇偶性调制可能起源于脉冲星火花放电过程中,辐射区子辐射束间边界不清晰而发生的混叠效应.

关键词：脉冲星单脉冲消零

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of Mo/Ni alloying on microstructural modulation and low-temperature toughness of high-strength low-alloy steel

引用

Journal of Iron and Steel Research International 2024年第7期31卷 1746-1762页

作者： Wei liu hong-li Zhao Bing-xing Wang yong Tian State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The high-strength low-alloy steel plates with varying Ni/Mo contents were manufactured using the thermos-mechanical control *** investigation was conducted to explore the effect of Ni/Mo microalloying on microstructure evolution and mechanical properties of the *** results revealed that the increase in Ni content from 1 to 2 wt.%reduced the transition temperature of ferrite and the growth range of ferritic grain was narrowed,which promoted grain *** optimized combination of grain size,high-angle grain boundaries(HAGBs),and martensite-austenite(M-A)islands parameter contributed to the excellent impact toughness of S1 steel at-100℃(impact absorbed energy of 218.2 J at-100℃).As the Mo increases from 0 to 2 wt.%,the matrix structure changes from multiphase structure to granular bainite,which increases the average effective grain size to~4.62 pm and reduces HAGBs proportion to~36.22%.With these changes,the low-temperature impact toughness of S3 steel is *** addition,based on the analysis of the characteristics of crack propagation path,it was found that M-A islands with low content(~2.21%)and small size(~1.76 pm)significantly retarded crack propagation,and the fracture model of M-A islands with different morphologies was further ***,correlation between behaviour of delamination and toughness was further analysed by observing delamination size and impact energy parameters.

关键词： High-strength low-alloy steel Microstructural regulation Ni addition Mo addition Crack propagation Low-temperature toughness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Granularity-Aware Parallel Aggregation Method for Data Streams

引用

Wuhan University Journal of Natural Sciences 2006年第1期11卷 133-137页

作者： WANG yong-li XU hong-bing XU li-zhen QIAN Jiang-bo liU Xue-jun Department of Computer Science and Engineering Southeast University Nanjing 210096 Jiangsu China

This paper focuses on the parallel aggregation processing of data streams based on the shared-nothing architecture. A novel granularity-aware parallel aggregating model is proposed. It employs parallel sampling and linear regression to describe the characteristics of the data quantity in the query window in order to determine the partition granularity of tuples, and utilizes equal depth histogram to implement partitio ning. This method can avoid data skew and reduce communi cation cost. The experiment results on both synthetic data and actual data prove that the proposed method is efficient, practical and suitable for time-varying data streams processing.

关键词： data streams parallel processing linear regression aggregation data skew

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于氮掺杂介孔碳修饰玻碳微球糊电极的双酚A电化学传感器的构建及性能研究

引用

广州化工 2024年第14期52卷 35-38,81页

作者：贺嘉夫茹孜马伟平李永红宁夏医科大学中医学院宁夏银川750004 宁夏医科大学公共卫生学院宁夏银川750004 宁夏环境因素与慢性病控制重点实验室宁夏银川750004

制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应... 详细信息

制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应过程。在最优的实验条件下,双酚A的响应电流与浓度在0.3~2μM和2~30μM范围内时呈线性关系,检测限是0.01μM(S/N=3)。该方法具有良好的重现性和抗干扰性,可用于实际样品的检测,样品回收率为97.5%~101.5%。

关键词：双酚A 氮掺杂介孔碳玻碳微球糊电极方波伏安法循环伏安法电化学传感器

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Antitumor Effect of Apcin on Endometrial Carcinoma via p21-Mediated Cell Cycle Arrest and Apoptosis

引用

Current Medical Science 2024年第3期44卷 623-632页

作者： Ke NI Zi-li li Zhi-yong HU li hong Department of Obstetrics and Gynecology Renmin Hospital of Wuhan UniversityWuhan430060China Institute of Reproductive Health Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Objective Endometrial carcinoma(EC)is a prevalent gynecological malignancy characterized by increasing incidence and mortality *** underscores the critical need for novel therapeutic *** such potential target is cell division cycle 20(CDC20),which has been implicated in *** study investigated the effect of the CDC20 inhibitor Apcin on EC and elucidated the underlying mechanism *** The effects of Apcin on EC cell proliferation,apoptosis,and the cell cycle were evaluated using CCK8 assays and flow *** sequencing(RNA-seq)was subsequently conducted to explore the underlying molecular mechanism,and Western blotting and coimmunoprecipitation were subsequently performed to validate the *** studies were performed to evaluate the antitumor effects in *** analysis was also conducted to identify CDC20 as a potential therapeutic target in *** Treatment with Apcin inhibited proliferation and induced apoptosis in EC cells,resulting in cell cycle *** associated with apoptosis and the cell cycle were activated following treatment with ***,Apcin treatment led to the upregulation of the cell cycle regulator p21,which was verified to interact with CDC20 and consequently decrease the expression of downstream cyclins in EC *** vivo experiments confirmed that Apcin treatment significantly impeded tumor *** CDC20 expression was observed in EC tissue than in nonmalignant tissue,and increased CDC20 expression in EC patients was associated with shorter overall survival and progress free *** CDC20 is a novel molecular target in EC,and Apcin could be developed as a candidate antitumor drug for EC treatment.

关键词： endometrial carcinoma CDC20 apoptosis cell cycle arrest p21 BBC3

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：