Results 61 to 70 of about 37,606 (171)

隔离涂层防绝缘子铁帽腐蚀的可行性研究

open access: yesDianci bileiqi, 2021
超/特高压直流输电线路瓷和玻璃绝缘子铁帽电腐蚀问题突出,有效的防腐蚀措施对电力系统的安全稳定运行具有重要意义。为了确定绝缘子铁帽表面喷涂隔离涂层的关键参数,本研究建立了绝缘子三维有限元模型,计算了绝缘子铁帽表面隔离涂层不同喷涂情况下的泄漏电流密度和电位分布,并试验验证了隔离涂层防铁帽腐蚀的可行性。研究结果表明:隔离涂层能够有效减小绝缘子铁帽的泄漏电流密度,绝缘子铁帽泄漏电流密度最大值随着隔离涂层高度的增加而增大,隔离涂层高度变化对绝缘子表面电位分布的影响较小;隔离能够对绝缘子铁帽起到有效的防腐蚀作用 ...
唐平   +4 more
doaj  

Cs2SnI6: A Perovskite‐Based Electromagnetic Wave Absorbing Material

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Lead halide perovskites and carbon‐based materials are interesting, high‐performing electromagnetic wave absorbing materials. However, only a few studies have been carried out to examine in detail the electromagnetic wave absorption properties of these materials.
Fei Han   +11 more
wiley   +1 more source

用于脉冲功率技术中的离子束断路开关

open access: yesGaoya dianqi, 1998
介绍用于真空储能装置中的离子束断路开关——IBOS。它是利用高速低密离子束代替低密中速等离子体融蚀断路开关“等离子体”而形成的,从而获得了更短的开断时间(
白峰, 邱毓昌
doaj  

Determination of amine compounds and inorganic cations in beer by ion chromatography with non-suppressed conductivity detector(非抑制电导阳离子色谱法测定啤酒中的阳离子和胺类化合物)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2009
建立了以甲基磺酸(MSA)和乙腈混合淋洗,离子交换色谱分离,非抑制电导检测,分析分离啤酒中阳离子和胺类化合物的方法.色谱条件经优化,在25 min内分离出啤酒中的7种阳离子和胺类化合物,方法的回收率和相对标准偏差分别为94.31%~109.9%和0.10%~1.2%.
HANXiao-jiang(韩小江)   +2 more
doaj   +1 more source

Construction of CoP/Mn2P Heterojunctions via One‐Step Phosphorization Coupled With Hollow Hard Carbon Spheres as Supports: Enabling Ultrastable Long‐Cycle Sodium‐Ion Anodes Over a Wide Temperature Range

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Driven by global energy transition and sustainability, sodium‐ion batteries (SIBs) have emerged as key alternatives to lithium‐ion batteries for low‐to‐medium energy storage, because of abundant sodium resources and low cost. However, their commercialization is hindered by the lack of anodes with high capacity, fast kinetics, and long‐term ...
Shuang‐Lin Cai   +13 more
wiley   +1 more source

平衡态与非平衡态等离子体物性参数计算模型研究

open access: yesGaoya dianqi, 2010
等离子体的宏观特性和内部微观过程紧密联系在一起。研究等离子体粒子组分构成以及对组分有强烈依赖关系的热力学参数、输运参数等物性参数,将为深入了解等离子体的形成机理奠定微观理论基础。笔者从元素化学计量守恒、道尔顿分压定律、质量作用定律、等离子体电荷准中性条件出发,总结了计算平衡态和非平衡态等离子体化学组分的基本方法。在此基础上,介绍了等离子体热力学参数(质量密度、焓值、熵值与比热)和输运参数的计算方法,并阐述了目前等离子体物性参数计算研究中存在的主要问题。
王伟宗   +4 more
doaj  

金星磁尾大尺度等离子体涡流

open access: yesKongjian kexue xuebao
已有研究发现金星磁尾的太阳风氢离子(H+)和金星电离层氧离子(O+)存在大尺度涡流结构, 该涡流从磁尾望向星球是逆时针的. 为了确定该涡流的存在性, 利用金星快车等离子体和高能原子分析仪(Analyzer of Space Plasmas and Energetic Atoms on Venus, ASPERA-4)的Fedorov矫正数据, 分别在金星公转轨道坐标系(VSO)和太阳风电场坐标系(VSE)下对磁尾等离子体流进行了统计分析.
柴 立晖, 郭 梦丹, 唐 晓谆
doaj   +1 more source

Nano-palladium/amphiphilic layered double hydroxides as catalyst for the Suzuki coupling reaction in aqueous media(钯纳米粒子/双亲性水滑石催化的水相中Suzuki偶联反应)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2012
设计合成了一种层间含有表面活性剂分子及纳米钯粒子的水滑石(LDHs)层状材料.设计方法是通过层间含表面活性剂负离子的LDHs与钯络负离子[]进行部分离子交换,得到贵金属络负离子与表面活性剂负离子共同插层的LDHs,再对金属络离子还原处理,最终得到被LDHs主体层板限域的客体纳米金属团簇.所得水滑石层状材料同时具有碱性、双亲性及金属纳米粒子催化位点三重功能,且层间距属于介孔范围,利于中长度有机反应分子的畅通.研究表明该材料对多种卤代芳烃与苯硼酸之间的水相中Suzuki偶联反应表现出优异的催化性能 ...
JINZheng-neng(金正能)   +2 more
doaj   +1 more source

Probing metal complex by mass spectrometry [PDF]

open access: yes, 2016
金属配合物由于具有优异的物理和化学性质,如催化、分子识别、手性拆分、C-H活化、荧光和生物医学等,在最近引起了广泛的研究兴趣。金属配合物的各种物理或化学性质与其结构及化学组成密切相关,目前X-射线单晶衍射是金属配合物结构和化学组成的主要表征方法。然而,X射线衍射的方法无法明确分辨电子数相近的原子,且对于金属配合物结构上的某些无序位置,X射线衍射的方法无法准确地确定其化学组成。而质谱是基于质荷比(m/z)表征化合物在溶液状态下的化学成分的分析仪器。与X射线衍射相比 ...
苏海峰
core  

Achieving Ambient‐Temperature Fast Hydrogenation Properties in Ga‐Doped Mg–Ni Alloy: Dual‐Phase Synergistic Catalysis and Stacking Fault Channels

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The high operating temperatures and sluggish kinetics of Mg‐based hydrogen storage materials (HSMs) are urgently being addressed. In this work, a novel Mg–Ni–Ga HSM with dual‐phase synergistic catalysis is developed, including the fishbone‐like Mg3Ni2Ga1 catalytic phase and the Mg2Ni phase with stacking faults (SFs).
Shiyang Hu   +7 more
wiley   +1 more source

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