Results 101 to 110 of about 22,800 (217)
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
Gaoya dianqi, 2018 气体绝缘金属封闭开关（GIS）在电力系统中应用广泛,其中盆式绝缘子长期在电热应力作用下不断发生老化降解,严重情况下可能会引发重大事故。盆式绝缘子的老化降解实际上是化学反应过程,因此研究盆式绝缘子的热分解过程具有重要意义。文中基于热分析动力学原理,采用热失重法分析了盆式绝缘子在5种不同升温速率下的热分解过程,采用Flynn-Wall-Ozawa法和Kissinger法计算了盆式绝缘子的活化能。研究结果表明,采用Flynn-Wall-Ozawa第1种方法和Kissinger方法计算结果基本一致,由Flynn-
金虎 +5 more
doaj
Tert-butylation of p-methoxyphenol over dealuminated Y zeolite(H-DAY分子筛催化对甲氧基苯酚的叔丁基化反应)
Zhejiang Daxue xuebao. Lixue ban, 2012 研究了 H-ZSM-5、H-MCM-41和氢型脱铝Y分子筛（简称H-DAY）在对甲氧基苯酚和甲基叔丁基醚反应合成3-叔丁基羟基茴香醚中的催化性能.研究表明，催化性能主要和催化剂的酸量、酸强度以及孔大小有关.其中，H-DAY由于其相对较大的总酸量和可容纳产物分子的孔径，在所考察的分子筛中表现出最高的反应活性，因此进一步考察了 H-DAY催化作用下反应时间、反应温度、催化剂用量和原料配比等反应条件对反应活性和选择性的影响以及催化剂的重复使用性能.
LOUYun(罗云) +3 more
doaj +1 more source
Rare Metals, EarlyView.ABSTRACT Developing Cu‐based composites that simultaneously achieve ultra‐high strength, ductility, and electrical conductivity remains critical for advanced electrical contact applications. In this work, multiphase AlCrCuFeNi2.5 high‐entropy alloy (HEA) reinforcements are incorporated into CuCrZr matrix via spark plasma sintering (SPS) and annealing ...
Tao Hong +8 more
wiley +1 more source
Gaoya dianqi, 2010 比较了不同的放电方式,即单纯脉冲火花放电、脉冲流光放电（针-板式、线-筒式）、介质阻挡放电（正脉冲、交流）对NO和CH4的活化转化能力。其中脉冲火花放电和针-板式脉冲流光放电对CH4的活化能力较强,CH4的最大转化率分别为100%和36%,但是在N2+O2体系中NOx的合成加剧。如在针-板式脉冲流光放电中,在O2体积分数为9.8%时,NO的体积分数为449μL/L。线-筒式脉冲流光放电中,即使在输入功率为14.4W时,CH4的最大转化率小于3%,而NO的最大转化率为25%。正脉冲介质阻挡放电中,在21 ...
牛金海, 张志慧, 刘东平
doaj
Rare Metals, EarlyView.ABSTRACT Periodontitis is a chronic infectious oral disease triggered by periodontopathogenic bacteria, resulting in the progressive inflammation and destruction of the tissues surrounding teeth. To achieve reprogramming of the infectious microenvironment for periodontitis therapy, a nanoformulation was proposed by loading polydopamine (PDA) with ...
Hao Liang +14 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2016 激活素是胞外信号蛋白TGF-超家族的成员。它具有多种调控功能,如细胞增殖和分化、细胞凋亡,代谢的动态平衡,免疫反应,创伤修复及各种内分泌功能[1,2]。激活素诱导胞内信号分子Smad蛋白磷酸化,Smad蛋白包括Ⅰ型和Ⅱ型受体。以往的研究表明 ...
李占东 +7 more
doaj
On the Damage Tolerance of Diffusion Bonded Titanium–Aluminum Phase Biomimetic Composites
Rare Metals, EarlyView.ABSTRACT The biomimetic design principles of natural structures involve the strategic integration of stiff and compliant phases to synergistically enhance strength and toughness. Its evolutionary refined natural armor, characterized by a specialized microarchitecture, enables superior damage tolerance.
Shuai Tong +10 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
Poly-Ge film with high quality fabricated by metal induced crystallization [PDF]
, 2015 Ge材料在光电子以及微电子领域有重要的应用。a-Ge晶化的方法可以将廉价的a-Ge转化为高质量的多晶Ge甚至单晶Ge，因而受到人们重视。然而传统a-Ge晶化的制备方法面临一些挑战，如晶化温度过高，形成的晶向不能高度单一化，形成的晶粒尺寸大小不能满足应用需求等，而金属诱导晶化的方法可以在低温下制得高质量的Ge薄膜，是人们近几十年中研究的一个热点。 本文采用金属诱导晶化的方法在石英衬底上制备出了高质量的多晶Ge薄膜，并围绕两个方面展开研究：一是a-Ge的有序度对a-Ge金属诱导晶化的影响 ...
王鹏
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