Results 91 to 100 of about 83,678 (232)

大气压等离子体助燃DBD激励器放电特性实验研究

open access: yesGaoya dianqi, 2010
等离子体DBD激励器可以在大气压或高于大气压的条件下产生等离子体。激励器的放电特性作为等离子体密度的决定因素,控制着等离子体助燃的作用及其效果。笔者在大气压条件下对不同电极距离、介质层厚度、激励器电极布局下的等离子体气体放电特性进行了实验研究。实验结果表明:可以通过减小介质层厚度、在合适范围内减小电极间距、优化激励器电极布局来提高电场场强、等离子体助然的效果。
兰宇丹   +3 more
doaj  

Modification of Lithium Rich Mn-based Layered Cathode Material for Lithium-ion Batteries [PDF]

open access: yes, 2016
富锂层状锰基正极材料具有比容量高、低成本和良好的安全性能等特点,是下一代高容量锂离子二次电池关键材料之一。本论文主要从材料合成、晶格修饰和表面修饰方面出发,系统探讨它们对富锂层状锰基正极材料的电化学性能的影响,从而深入的理解电化学反应过程的机理和结构变化,尤其是对“电压降”现象的影响。具体内容如下: 1.
李冰
core  

Surface‐Embedded Ag@Multilayer Graphene for Photothermal‐Enhanced Superhydrophobic Anti‐Icing Coatings

open access: yesRare 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

Preparation and Photoluminescence of Praseodymium-Doped Silicon Aluminum Oxynitride Phosphors by Polymer-Derived Method [PDF]

open access: yes, 2016
应用先驱体转化法制备稀土掺杂硅基氮氧化物荧光粉,可以改善传统的固相反应法所需要的高温高压等苛刻条件。掺镨含铝硅基氮氧化物红色荧光粉具有较好的发光稳定性及化学稳定性,在显示照明领域具有潜在的应用价值。目前,尚没有先驱体转化法制备掺镨含铝硅基氮氧化物红色荧光粉的报道,因此,有必要探讨先驱体转化法制备该荧光粉的合成工艺及参数。本论文采用聚碳硅烷、乙酰丙酮镨和乙酰丙酮铝为原料,通过聚合反应得到先驱体,在氨气中经氮化实现有机-无机转化,再经结晶制备掺镨含铝硅基氮氧化物荧光粉。系统研究了烧结温度、投料原子比 ...
余辉
core  

Electrospun Carbon Nanofiber‐Based Multifunctional Electrocatalysts for Zinc‐Air Batteries and Overall Water Splitting: Fabrication, Progress, and Perspective

open access: yesRare Metals, EarlyView.
ABSTRACT The development of high‐performance and stable electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) plays a critical role in advancing clean energy technologies, including metal‐air batteries and hydrogen production through overall water splitting.
Chen‐Yu Cai   +4 more
wiley   +1 more source

Enhanced Upconversion Luminescence of Metal-Capped NaGd0.3Yb0.7F4:Er Submicron Particles [PDF]

open access: yes, 2016
镧系掺杂上转换发光材料因其独特的发光性质在太阳能电池、生物医学等众多领域都具有广阔的应用前景,但其相对较低的发光效率一直是阻碍大规模应用的主要原因。因此寻找合适的手段来高效地提高材料的上转换发光效率是目前的研究热点。研究表明,通过金属微纳结构的表面等离激元可以有效提高材料的上转换发光效率。理论计算显示,当等离激元微腔的尺寸在约200~350nm之间时会形成可见光区的腔模,有可能进一步增强镧系离子的上转换发光。而目前通过主流合成方法获得的上转换发光材料的尺寸通常在10~50nm之间 ...
吕梦云
core  

Multiscale Study of a Synergistic System in Carbon‐Coated Multimetal‐Based Selenides Toward Rapid and Highly Stable Sodium Storage

open access: yesRare 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

直流盘形悬式绝缘子离子迁移测试系统的研制

open access: yesGaoya dianqi, 2015
针对高压直流盘形悬式瓷或玻璃绝缘子离子迁移问题,以直流绝缘子离子迁移试验标准为基础,对国内外直流绝缘子离子迁移的机理研究和开发的试验系统进行了分析和调研,设计了完整的直流绝缘子离子迁移试验系统和方案,并开发了一套基于MSP430单片机的直流绝缘子体电流采集处理系统,实现了50路体电流信号和1路电压信号的的循环测量和数据采集,体电流测量结果自动量程转换。整套系统满足直流绝缘子离子迁移试验标准要求,具有一定的工程实用性。
骆晓龙, 张晋寅, 张源斌
doaj  

Interface Issues of Inorganic Solid‐State Electrolytes in Secondary Magnesium Batteries

open access: yesRare Metals, EarlyView.
ABSTRACT Solid‐state magnesium batteries (SSMBs) have gained significant attention as promising candidates for next‐generation safe energy storage systems because of the abundance of magnesium (Mg) in the earth's crust, superior energy density, and inherent nonflammability.
Jiren Wang   +9 more
wiley   +1 more source

Study on the relationship of antioxidant activity with structure on flavonoids as scavengers of superoxide anion(黄酮类化合物抗氧化性能与其结构的关系)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2006
以邻苯三酚自氧化体系产生超氧阴离子(),用微量热法测定了 13种黄酮单体清除超氧阴离子的摩尔反应焓.以摩尔反应焓的大小作为比较指标,对黄酮体的结构与清除超氧阴离子活力之间的关系进行了探讨.实验结果表明随着苯环上羟基数目的增加,黄酮类化合物抑制超氧阴离子的能力增强;同时C环中C2 —3双键和B环中邻二羟基(3,4-二羟基)是清除超氧阴离子的主要活性部位.
ZHANGLin(张琳), LUWei-min(陆维敏)
doaj   +1 more source

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