检索结果-南通市图书馆

Two-stage aging treatment to accelerate aging kinetics without impairing strength in BC/7A04Al composite

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2024年

作者： CHEN yuntao MA GuoNan zhu ShiZe WANG Dong XIAO BoLü MA ZongYi Shi-Changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China Centre of Excellence for Advanced Materials

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage （SS） aging is time-consuming to reach a peak strength condition. In this study, an efficient 120℃+160℃ two-stage（TS） aging treatment was proposed on a B4C/7A04Al composite fabricated via powder metallurgy （PM） technology, which could acquire similar peak-aging strength but only took about 15%of the time compared to traditional 120℃ SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitatefree zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

关于艺术形态学新建构的设想

南京艺术学院学报（美术与设计） 2009年第3期 105-109页

作者：朱云涛东南大学艺术学院江苏南京210096

传统的艺术形态研究或集中于艺术作品的形式,或集中于由艺术门类构成的系统,这两种意义上的艺术形态研究显然是不全面的。新的艺术形态学建构应该在对象化的生活世界中辨认艺术的身影,应该从整体上描述艺术的状态、特征及其演变。

关键词：艺术形态学艺术门类新建构

Quantitative Profiling of Protein O-GlcNAcylation Sites by an Isotope-Tagged Cleavable Linker

在线全文

学校读者我要写书评

暂无评论

Quantitative Profiling of Protein O-GlcNAcylation Sites by a...

第十一届全国化学生物学学术会议

作者： Ke Qin yuntao zhu Wei Qin Jinjun Gao Chu Wang Xing Chen College of Chemistry and Molecular Engineering Peking University

Large-scale quantification of protein O-linked β-N-acetylglucosamine（O-GlcNAc） modification in a site-specific manner remains a key challenge in studying O-GlcNAc ***,we developed an isotope-tagged cleavable linker（isoTCL） strategy,which enabled isotopic labeling of O-GlcNAc through bioorthogonal conjugation of affinity *** demonstrated the application of the isoTCL in mapping and quantification of O-GlcNAcylation sites in HeLa ***,we investigated the O-GlcNAcylation sensitivity to the sugar donor by quantifying the levels of modification under different concentrations of the O-GlcNAc labeling probe in a site-specific *** addition,we applied isoTCL to compare the O-GlcNAcylation stoichiometry levels of more than 100 modification sites between placenta samples from male and female mice and confirmed site-specifically that female placenta has a higher O-GlcNAcylation than its male *** isoTCL platform provides a powerful tool for quantitative profiling of O-GlcNAc modification.

关键词： O-GlcNAc Click chemistry ETD Chemoproteomics

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

熊佛西戏剧理论的独特贡献及其现实意义

江西社会科学 2005年第2期25卷 230-239页

作者：朱云涛李伟东南大学艺术学系上海戏剧学院

熊佛西是中国话剧的拓荒者之一,是我国现代著名的戏剧活动家、剧作家、导演和戏剧教育家,同时也是颇有建树的戏剧理论家。他在实践和理论上的开拓,不仅在当时产生巨大的影响,而且对今日中国戏剧事业的发展也同样具有借鉴价值和指导意义... 详细信息

熊佛西是中国话剧的拓荒者之一,是我国现代著名的戏剧活动家、剧作家、导演和戏剧教育家,同时也是颇有建树的戏剧理论家。他在实践和理论上的开拓,不仅在当时产生巨大的影响,而且对今日中国戏剧事业的发展也同样具有借鉴价值和指导意义,是一笔不可多得的宝贵财富。熊佛西戏剧理论的核心是:戏剧是大众的艺术。围绕这个核心,他对戏剧作出全面考察,在戏剧本体上强调动作,在戏剧美学特征上倚重“趣味”和“单纯”,在戏剧功能上致力于社会教育、增强民族凝聚力。熊佛西的戏剧理论具有视野开阔、重实践、社会时代感强等鲜明特征。

关键词：熊佛西戏剧理论大众艺术趣味中心论单纯主义教育功能

右美托咪定静脉维持麻醉在老年风湿性心脏病患者瓣膜置换术中的应用价值

在线全文

学校读者我要写书评

暂无评论

中华心脏与心律电子杂志 2019年第3期7卷 129-131页

作者：朱允涛濮阳市第三人民医院麻醉科

目的探讨麻醉诱导后右美托咪定静脉维持在老年风湿性心脏病患者瓣膜置换术中应用效果。方法选取2016年7月至2018年8月于濮阳市第三人民医院接受瓣膜置换术治疗的86例老年风湿性心脏病患者,按随机数表法分为对照组和观察组,每组43例。观... 详细信息

目的探讨麻醉诱导后右美托咪定静脉维持在老年风湿性心脏病患者瓣膜置换术中应用效果。方法选取2016年7月至2018年8月于濮阳市第三人民医院接受瓣膜置换术治疗的86例老年风湿性心脏病患者,按随机数表法分为对照组和观察组,每组43例。观察组在麻醉诱导后静脉滴注右美托咪定维持麻醉,对照组输注等量生理盐水。比较两组患者注药前、切皮后、术毕时平均动脉压(MAP)、心率(HR)、血浆二胺氧化酶(DAO)水平。结果观察组切皮后、术毕时HR均低于对照组,切皮后MAP低于对照组,差异有统计学意义(均P<0.05)。切皮后、术毕时观察组血浆DAO水平均低于对照组,差异有统计学意义(均P<0.05)。结论在老年风湿性心脏病患者瓣膜置换术麻醉诱导后采用右美托咪定静脉维持,有助于维持血流动力学稳定,减轻肠黏膜损伤。

关键词：风湿性心脏病瓣膜置换术右美托咪定麻醉

Few-shot incremental radar target recognition framework based on scattering-topology properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第8期37卷 246-260页

作者： Chenxuan LI Weigang zhu Bakun zhu Yonggang LI Graduate School Space Engineering UniversityBeijing 101400China Department of Electronic and Optical Engineering Space Engineering UniversityBeijing 101400China

The continuous emergence of new targets in open scenarios leads to a substantial decrease in the performance of Inverse Synthetic Aperture Radar(ISAR)recognition ***,data scarcity further exacerbates the challenge of identifying new classes of ISAR *** this paper,a few-shot incremental target recognition framework based on Scattering-Topology Properties(STPIL)is ***,STPIL extracts scattering-topology properties of ISAR targets as recognition ***,the pseudo-incremental training strategy effectively alleviates the algorithm’s forgetting of old knowledge,and improves compatibility with new ***,a feature embedding network,with few parameters,is designed based on the graph neural *** embedding network is highly adaptable to changes in data ***,STPIL fully considers the joint distribution and marginal distribution in scattering features,and uses the Brownian distance metric module to make the scattering-topology features more *** results on both the simulation dataset and the public measured data indicate that STPIL can effectively balance new classes with old classes,and has superior performance to other advanced methods in the incremental recognition of targets.

关键词： Brownian distance metric Graph neural networks Incremental learning Inverse Synthetic Aperture Radar(ISAR) Scattering

Stress-strain relationship for reactive powder concrete with recycled powder under uniaxial compression

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

Frontiers of Structural and Civil Engineering 2024年第7期18卷 1015-1027页

作者： Peng zhu Yunming zhu Wenjun QU Liyu XIE College of Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education Tongji UniversityShanghai 200092China

The recycled powder(RP)from construction wastes can be used to partially replace cement in the preparation of reactive powder *** this paper,reactive powder concrete mixtures with RP partially replacing cement,and natural sand instead of quartz,are *** curing is used,instead of steam curing that is normally requested by standard for reactive powder *** influences of RP replacement ratio(0%,10%,20%,30%),silica fume proportion(10%,15%,20%),and steel fiber proportion(0%,1%,2%)are *** effects of RP,silica fume,and steel fiber proportion on compressive strength,elastic modulus,and relative absorption energy are analyzed,and theoretical models for compressive strength,elastic modulus,and relative absorption energy are established.A constitutive model for the uniaxial compressive stress-strain relationship of reactive powder concrete with RP is *** the increase of RP replacement ratio from 0% to 30%,the compressive strength decreases by 42% and elastic modulus decreases by 24%.

关键词： recycled powder reactive powder concrete elastic modulus relative absorbed energy stress-strain relationship

Quantitative time-resolved chemoproteomics reveals stable O-GlcNAc regulates box C/D snoRNP biogenesis

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

Quantitative time-resolved chemoproteomics reveals stable O-...

Carbon Emission Effects Driven by Evolution of Chinese Dietary Structure from 1987 to 2020

第十届全国化学生物学学术会议

作者： Wei Qin Pinou Lv Xinqi Fan Baiyi Quan yuntao zhu Ke Qin Ying Chen Chu Wang Xing Chen College of Chemistry and Molecular Engineering Peking University Peking-Tsinghua Center for Life Sciences Peking University Beijing National Laboratory for Molecular Sciences Peking University Synthetic and Functional Biomolecules Center Peking University Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Peking University

O-GlcNAcylation, a ubiquitous posttranslational modification on intracellular proteins, is dynamically regulated in cells. To analyze the turnover dynamics of O-GlcNAcylated proteins, we developed a quantitative time-resolved O-GlcNAc proteomics（qTOP） strategy based on metabolic pulse-chase labeling with an O-GlcNAc chemical reporter and stable-isotope labeling with amino acids in cell culture（SILAC）. Applying qTOP, we quantified the turnover rates of 533 O-GlcNAcylated proteins in NIH3T3 cells and discovered that about 14% exhibited minimal removal of O-GlcNAc or degradation of protein backbones. The stability of those hyper-stable O-GlcNAcylated proteins was more sensitive to O-GlcNAcylation inhibition as compared to the more dynamic populations. Among the hyper-stable population were three core proteins of box C/D small nucleolar ribonucleoprotein complexes（snoRNPs）, fibrillarin（FBL）, NOP56, and NOP58. We showed that O-GlcNAcylation stabilized these proteins and was essential for snoRNP assembly. Blocking O-GlcNAcylation on FBL altered the 2’-O-methylation of ribosomal RNAs, and impaired cancer cell proliferation and tumor formation in vivo.

关键词： O-GlcNAcylation metabolic labeling proteomics protein stability snoRNP

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Geographical Science 2024年第1期34卷 181-194页

作者： zhu Yuanyuan ZHANG Yan zhu Xiaohua Key Laboratory of Geographic Process Analysis&Simulation Hubei Province Central China Normal UniversityWuhan430079China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China

Exploring carbon emission effects based on the evolution of residents’ dietary structure to achieve the carbon neutrality goal and mitigate climate change is an important *** study took China as the research object(data excluding Hong Kong,Macao and Taiwan) and used the carbon emission coefficient method to quantitatively measure the food carbon emissions from 1987–2020,then analyzed the carbon emission effects under the evolution of dietary *** results showed that during the study period,the Chinese dietary structure gradually changed to a high-carbon consumption *** dietary structure of urban residents developed to a balanced one,while that of rural residents developed to a high-quality *** the study period,the per capita food carbon emissions and total food consumption of Chinese showed an increasing *** per capita food carbon emissions of residents in urban and rural showed an overall upward *** total food carbon emissions in urban increased significantly,while that in rural increased first and then *** influence of beef and mutton on carbon emissions is the highest in dietary *** with the balanced dietary pattern,the food carbon emissions of Chinese residents had not yet reached the peak,but were evolving to a high-carbon consumption pattern.

关键词： dietary structure structural evolution carbon emission effects carbon neutrality China