The Research and Application of Concrete Admixture for Shield Segment [PDF]
, 2016 随着我国城市化水平的不断提高，城市交通拥堵问题日益突出，地铁的修建逐渐成为城市发展趋势。目前国内外运用最为广泛的地铁施工方法是盾构施工法，而盾构管片作为盾构施工的主要装配构件，其质量直接关系到隧道的整体质量和安全。目前国内最常用的盾构管片是预制混凝土管片，预制混凝土管片常采用聚羧酸系减水剂。国内常规的聚羧酸减水剂存在振捣时间较长、混凝土收面时间较长等问题，国外公司生产的早强型聚羧酸系减水剂性能良好，但是价格昂贵。因此，开发出性能优良、价格合理的早强型聚羧酸减水剂，具有重要的意义 ...
尹峻
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Expression and Characterization of Xyloglucanase from Paenibacillus borealis and Its Application in the Production of Xylogluco-oligosaccharides from Apple Pomace [PDF]
Apple pomace (AP) is rich in xyloglucan, serves as a substrate to produce xylogluco-oligosaccharides with various functional activities. The hydrolysis of AP by novel xyloglucanases is conducive to the high-value utilization of AP. In this study, a novel
Hang YANG +5 more
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Attainment Pairing Effects on Cognitive Conflict in Technology‐enhanced EFL Cooperative Tasks
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how attainment pairing (high‐high versus high‐low versus low‐low attainment) impacts English as a Foreign Language (EFL) learner engagement during technology‐enhanced cooperative writing tasks. Seventy‐eight Chinese university learners formed 39 dyads (13 pairs per group) via Tencent Meeting.
Ying Liu, Allen Thurston
wiley +1 more source
Characterization of Condensed Tannins from Litchi Seed by Reflectron Modes and Linear Modes of MALDI-TOF MS [PDF]
, 2011 E-mail: zhouhc2010@yahoo.com.cn[中文文摘]利用不同模式的基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)分析荔枝果核缩合单宁.在反射模式(Reflectron modes)下,加速电压20.0 kV,反射电压23.0 kV,延时取出电压16.32 kV,聚焦电压9.45 kV,获得缩合单宁的准确结构单元组成和连接方式信息,其为三聚体至十八聚体组成的A型原花青定多聚物.在线性模式(Linear modes)下,加速电压20.0 kV,延时取出电压16.25 kV,
周海超 +4 more
core +3 more sources
The research on structure and bioactivities of condensed tannins from Ficus altissima leaves [PDF]
, 2016 高山榕（FicusaltissimaBlume）是一种广泛栽培的绿化植物，目前主要用作行道树，园景树和庭荫树，对于其其它方面的开发和利用较少，未使其价值得到充分的体现。本研究通过总酚和可溶性单宁的测定发现两者在高山榕叶片中都具有较为丰富的含量，分别达118.4±3.3mgGAE/gDW和39.61±1.02mg/gDW。单宁结构复杂多样，具有特殊丰富的生物活性，目前已广泛应用于医药、食品、农业、生态等多个方面，逐渐成为植物化学、药理学和食品化学等交叉学科的研究热点 ...
梁戈
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT To address the issues of aluminum (Al) powder agglomeration during combustion and low oxidizer decomposition efficiency in composite solid propellants, this study utilized in situ self‐assembly technology to prepare cobalt‐based hybrid‐coated modified Al powder (Al@CZ).
Chong Chen +11 more
wiley +1 more source
界面电荷注入与积聚行为对直流GIS/GIL绝缘子沿面电场的影响分析
Gaoya dianqi, 2021 气体绝缘组合电器(gas insulated switchgear,GIS)和气体绝缘金属封闭输电线路(gas insulated metalenclosed transmission line,GIL)运行电流大,设备内部存在明显的温度梯度分布,造成高压电极附近电荷的注入与迁移加剧,导致绝缘子内空间及表面电荷的积聚,畸变电场,容易诱发沿面闪络故障。为此文中建立了电—热耦合应力下直流盆式绝缘子内的电荷注入与积聚模型,研究了考虑电荷注入和迁移特性的绝缘子空间电荷及表面电荷积聚情况 ...
胡琦 +4 more
doaj
Controllable Synthesis of Cellulose Esters by Homogeneous Transesterification and Its Application [PDF]
, 2017 随着石油、煤炭等不可再生资源的日益枯竭，为了满足社会经济可持续发展的需要，以纤维素生物质为原料制备高附加值化工品及燃料的研究逐渐成为人们研究的热点。本文以多种来源的纤维素为原料，以N，N-二甲基乙酰胺/氯化锂（DMAc/LiCl）为溶剂体系，建立一种温和快速均相酯交换可控制备纤维素酯的方法，改进了纤维素在DMAc/LiCl体系中的溶解过程，优化了酯交换反应制备工艺，分析了纤维素酯类产物特征，探索了一种SEC测定纤维素分子量的方法，为纤维素酯的后续研究及应用提供理论基础和依据。 研究微晶纤维素在DMAc ...
丁佳佳
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source
Information and Communication Technologies and Informal Scholarly Communication: A Review of the Social Oriented Research [PDF]
, 2009 This article reviews and analyzes findings from research on computer mediated informal scholarly communication. Ten empirical research papers, which show the effects and influences of information & communication technologies (ICTs), or the effects of ...
Lin, Chi-Shiou, Yuan, Da-Yu
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