Results 41 to 50 of about 10,333 (201)

Impact of Remote Phosphor Shape on LED Luminous Performance [PDF]

open access: yes, 2017
研究了不同驱动电流和光强分布条件下,圆顶形、椭球形以及圆锥形远程荧光粉的发光性能。实验采用蓝光LED激发YAG:Ce3+荧光粉产生白光,并通过恒流源和TEC控温热沉分别控制LED驱动电流和热沉温度,通过对三种不同形状远程封装的荧光粉的光、色指数等进行对比,发现椭球状样品的综合光学特性最佳,光通量最高。同时,三种远程荧光粉分别进行了不同电流下的Yellow-blue Ratio(YBR)空间分布测试,结果显示,圆顶形样品的YBR空间分布均匀性最好,且在不同电流下ACCTD及ACU值在三种样品中最优 ...
党思佳   +5 more
core   +1 more source

Configuration Optimization Design of Magnetic Circuit for Large Magnetostrictive Devices Based on TbDyFe Alloy

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Reliable operation of high‐performance magnetostrictive devices, composed of the giant magnetostrictive material (GMM), that is, the TbDyFe alloy, critically depends on an optimally tailored bias magnetic field. Sufficient intensity and uniformity are essential to induce the ideal initial strain in the GMM, enabling peak reciprocating output ...
Jinan Yu   +12 more
wiley   +1 more source

梭式窑局部对流换热系数的分析

open access: yesDianci bileiqi, 1995
根据空气动力模型的模拟结果,分析了窑炉结构与操作对窑内换热均匀性的影响,提出了改善窑炉换热均匀性的方法。
吴建青, 刘振群
doaj  

均匀平面天线阵列的大规模MIMO系统评估

open access: yesGuangtongxin yanjiu, 2020
针对毫米波和传统蜂窝频段场景下频谱效率和传输可靠性较低的问题,文章提出了一种三维散射簇多天线信道模型以分析大规模多输入多输出(MIMO)系统性能。文章假设仰角和方位角分别遵循拉普拉斯和Von-Mises分布,推导出均匀平面阵列天线各单元之间空间相关系数的解析表达式,最后建立MIMO多天线系统模型并分析其系统性能。研究了仰角功率谱中不同角度扩展对均匀平面阵列衰落相关性和信道容量的影响,以及不同信噪比和天线阵元数对频谱效率的影响。分析结果与传统的均匀线性阵列进行比较表明,在毫米波场景下 ...
周杰, 李豪杰, 刘杨
doaj  

ポスト キンダイ ノ ブンカ ト ディアスポリック チャイニーズ チュウゴクケイ フィリピンジン ノ サイイミン ヲ メグッテ [PDF]

open access: yes, 2010
大阪大學中國文化論壇 討論文件Discussion Papers in Contemporary China Studies, Osaka University Forum on ...
Miyabara, Ryo   +2 more
core  

Oxygen Vacancy Engineering of Ultrafine ZnAl2O4 Nanoparticles as a Robust Protective Layer for Dendrite‐Free and Long‐Lifespan Aqueous Zn Metal Anodes

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Aqueous zinc‐ion batteries (AZIBs) hold great promise for safe and sustainable energy storage, but their commercialization is impeded by severe Zn dendrite growth and interfacial instability. To address these challenges, we propose a defect engineering strategy employing ultrafine ZnAl2O4 (ZAO) nanoparticles (∼5 nm) with oxygen vacancy defects
Yilun Ren   +9 more
wiley   +1 more source

Pattern recognition based high-resolution NMR spectroscopy under inhomogeneous magnetic fields [PDF]

open access: yes, 2015
核磁共振(NMR)波谱技术具有非侵入、无损伤以及高分辨率(提供化学位移及标量偶合等分子水平信息)的特点,被广泛应用于化学结构鉴定、生物蛋白分子三维结构解析及医药检测等众多领域。然而,高分辨的核磁共振波谱通常要求高度均匀且稳定的磁场条件。这种要求在很多时候是无法满足的,例如存在磁化率不连续的生物组织内部及不同组织的分界面。因此,不均匀磁场条件下的高分辨核磁共振波谱方法研究具有重要的意义。本文利用局部磁场均匀性、谱线增宽相干及时空编码技术在不均匀磁场下获取谱图,进而以模式识别为基础设计相应的校正算法 ...
韦芝良
core  

Electrolyte With Functionalized Boron Nitride Nanosheets for Dendrite‐Free Lithium Metal Anodes

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Lithium metal batteries (LMBs) are regarded as promising candidates for the next‐generation high‐energy‐density storage systems due to their unparalleled theoretical energy density and low redox potential. However, the commercialization of LMBs is tremendously plagued by the barbaric growth of lithium dendrite and the intricate decomposition ...
Ji Zhou   +5 more
wiley   +1 more source

Engineering on Iron-Oxide-Based Nanoparticles for High-Performance Magnetic Resonance Imaging [PDF]

open access: yes, 2015
第一章,我们简要介绍了MRI的技术背景、MRI造影剂的研究背景以及基于磁性氧化铁纳米材料的合成和生物功能化应用,主要探讨了MRI造影剂材料的研究现状和潜在问题。我们分析了磁性材料(包括分子螯合物配合物类和纳米颗粒类)作为MRI造影剂的关键因素,勾勒出了对于磁性材料的优化设计及其MRI应用的重要切入点。最后,我们简单探讨了氧化铁纳米材料的合成以及表面生物功能化对于其生物医学应用的重要性。 第二章,我们研究了一种独特磁铁矿型超顺磁氧化铁纳米片,这种纳米片可以通过合成调控得到厚度不同的样品 ...
周子健
core  

Coalescence‐Ripening Mechanism of γ′−Ni3(Al, Ti) During Long‐Term/High‐Temperature Operation of Ni‐Based Superalloy Discs

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT The evolution of the γ′−Ni3(Al, Ti) phase in superalloys is governed by a coupled coalescence‐ripening mechanism driven by elemental diffusion. In this study, thermal exposure experiments were performed at 750°C and 800°C for durations ranging from 100 to 20,000 h.
Zhaotian Wang   +5 more
wiley   +1 more source

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