Results 21 to 30 of about 9,698 (123)
Network Public Opinion Analysis and Its Application Research Based on Topic Model [PDF]
, 2017 随着“互联网+”战略的深入贯彻，网络舆情已经成为把握时下舆论热点的先锋战场。鉴于网络舆情的重要地位，本文在研读有关网络舆情发展现状和主题模型应用的基础上，提出自适应标签主题模型（ALS-TM）与自适应时间窗动态主题模型（ATS-DTM）两个主题模型，分别从静态和动态两个角度捕捉舆情热点及其演化方向。第一部分，本文提出基于静态视角下的主题模型：自适应标签主题模型，用以提高主题解释力。ALS-TM模型结合主题聚合度指标与K-Means聚类算法，寻找最优分类标签，以此增强主题提取效率。实验结果表明：第一 ...
于学伟
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Rare Metals, EarlyView.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 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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Rare Metals, EarlyView.ABSTRACT Considering the multiple challenges faced by stealth coatings in complex service environments, the development of multifunctional integrated microwave absorbing materials (MAMs) that combine efficient electromagnetic (EM) attenuation with environmental tolerance has become an urgent need. In this work, coral‐like CoNi@Void@C microparticle (MP)
Jiale Wu +8 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Single‐atom catalysis hinges on fundamental challenges in precisely controlling metal‐support interactions and rationally regulating metal–adsorbate relationships. Herein, we report a universal strategy for constructing highly efficient and well‐defined Cu(I) single‐atom catalysts based on a trifurcate AlL3 molecular support.
Donghui Zhang +9 more
wiley +1 more source
Study on Structure of Tannin in Prunus salicina Lindl.Fruits and Its Antioxidant Activity [PDF]
, 2008 对李子果肉的总酚含量与可溶性缩合单宁含量进行了测定,并利用基质辅助激光解吸附离子化飞行时间质谱(MALDI-TOF MS)联合核磁共振(NMR)技术详细研究了李子果肉单宁的类型、聚合度及平均分子质量。同时用二苯基苦基肼自由基(DPPH·)法研究了李子果肉单宁的抗氧化活性。结果表明:李子果肉中总酚质量分数为8.29%±1.30%,可溶性缩合单宁质量分数为1.43%±0.93%;构成该单宁的黄烷-3-醇结构单元主要是表儿茶酚,在化学结构上属于原花青定类型 ...
张亮亮, 李敏, 林益明, 林鹏
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Comprehensive Evaluation of Starch and Noodles Quality of Different Sweet Potato Varieties Based on Principal Component Analysis and Cluster Analysis [PDF]
To scientifically evaluate the starch quality of different sweet potato varieties and establish the sweet potato starch quality evaluation system, 10 starchy sweet potato varieties were used as experimental materials.
Mei FU +6 more
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Rare Metals, EarlyView.ABSTRACT The development of sodium‐ion batteries (SIBs) is limited by slow charge transfer kinetics and large material volume changes caused by the large radius of Na+. Leveraging the excellent physicochemical properties and unique heterostructures of metal selenides, ultrafine hetero‐CuFeSe2‐CoSe2 nanoparticles are in situ wrapped by ...
Ying Zhu +5 more
wiley +1 more source
Contents and Structure Analysis of Tannins in Leaves of Three Cultivars of Camellia sinensis [PDF]
, 2009 测定了本山、黄旦和铁观音三个品种茶树成熟叶片的总酚及可溶缩合单宁含量,并通过基质辅助激光解吸附飞行时间质谱(MAldI-TOfMS)研究了茶叶缩合单宁的基本结构。结果显示,三种茶叶均具有较高的总酚含量,大约为200Mg/g;三种茶叶的缩合单宁是以(表)儿茶素(EC/C)和(表)棓儿茶素(EgC/gC)为基本结构单元的均聚物和杂聚物,且大部分聚合物的结构单元之间存在A型和b型两种连接方式,其中本山和黄旦缩合单宁的最高聚合度要大于铁观音。The contents of total polyphenols ...
李敏 +4 more
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Rare Metals, EarlyView.ABSTRACT Efficient and durable bifunctional electrocatalysts are vital for scalable water electrolysis. Here, we realize cobalt‐vacancy (Covac) engineering in CoFeP supported on N,P‐codoped carbon nanocages (Co1‐vacFeP/NPC) through a simple route comprising a CoFe Prussian blue analog precursor, phosphidation–pyrolysis, tannic‐acid etching, and a ...
Yuan‐Liang Yuan +6 more
wiley +1 more source