Results 61 to 70 of about 29,284 (225)

Improving the Electrochemical Properties of SiOx/Graphite Anode for High‐Performance Lithium‐Ion Batteries by Ultrathin Lithium Film Prelithiation

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT High‐capacity SiOx/graphite (SiO/G) anodes offer great potential for advancing lithium‐ion battery technology; however, their practical application is limited by low initial coulombic efficiency (ICE) and rapid capacity decay. These challenges primarily arise from unstable phase transitions and the formation of the solid electrolyte interphase
Wan‐Xing Zhang   +14 more
wiley   +1 more source

Study on Modification of Wave Absorbing Ability of Silicon Carbide [PDF]

open access: yes, 2015
碳化硅具有化学性质稳定、耐高温、耐化学腐蚀、强度高、导热系数高、热膨胀系数小的特点,不仅仅被广泛应用在功能陶瓷、高级耐火材料、磨料及冶金原料等民用领域,还应用于航空航天领域,用作发动机的热端部件。但是,有机先驱体转化法制备的SiC陶瓷电阻率高,对电磁波吸收效率不高。然而,对SiC进行电磁性能改性是该材料具有雷达隐身性能的基础。因此将铁、钴和碳等引入到碳化硅中,提高其介电损耗和磁损耗,进而提高其吸波性能,对发展功能化SiC陶瓷具有重要的意义。 本文选取易石墨化、碳化产率高且价格便宜中间相沥青作为碳源 ...
丁绍楠
core  

Highly Stable Aqueous Zinc Anodes Enabled by Synergistic Modulation of Interface and Solvation Structures

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The stability of aqueous Zn2+ batteries is severely hindered by parasitic reactions at the Zn anode/electrolyte interface. Herein, itaconic acid (IA) is introduced as an effective electrolyte additive to achieve a highly stable zinc anode. Remarkably, IA concurrently modulates both the zinc anode/electrolyte interfacial structure and the Zn2 ...
Chenggang Wang   +5 more
wiley   +1 more source

Volumetric properties of ions in DMF-water mixtures(离子在DMF-水混合溶剂中的体积性质)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2003
利用精密数字密度计测定了298.15 K氯化钾及氯化铵在N,N-二甲基甲酰胺(DMF)-水混合溶剂中的密度,计算了氯化钾及氯化铵的表观摩尔体积和极限偏摩尔体积,得到了相关离子的极限偏摩尔体积和迁移偏摩尔体积.结果表明,当DMF浓度为15%~45%时,K+和的极限偏摩尔体积均表现增加趋势;而Cl的极限偏摩尔体积在同一DMF浓度范围内则表现为逐渐减小.利用溶质溶剂和溶剂-溶剂相互作用对结果进行了讨论.
XULi(许莉), LINRui-sen(林瑞森)
doaj   +1 more source

First-principles calculations of perpendicular magnetic anisotropy in Fe1-xCox/MgO(001) [PDF]

open access: yes, 2015
近年来,垂直磁隧道结由于在磁记录、磁随机存储器、微波探测器以及磁敏传感器等方面的广阔应用前景引起人们广泛的关注。其中由单质Fe或者FeCo基合金与单晶MgO(001)结合形成的垂直磁隧道结具有高隧穿磁电阻、高热稳定性、低临界翻转电流的优点,是人们研究的重点。虽然大量的研究取得了丰硕的成果,但是横亘在FeCo/MgO隧道结应用之前的一个重要问题是铁磁层的垂直各向异性难以在较高厚度下保持,提高了材料制备工艺的难度。为此,本文拟研究Fe/MgO中垂直磁各向异性随Fe厚度变化的内在机制,通过优化Fe ...
蔡官志
core  

聚(偏氟乙烯-三氟乙烯)纳米薄膜极化反转与疲劳特性

open access: yes, 2015
采用旋涂法制备了厚度为140nm的聚(偏氟乙烯一三氟乙烯)[P(VDF-TrFE)1纳米薄膜,研究了不同退火温度以及环境相对湿度对薄膜的极化反转和疲劳性能的影响.运用X射线衍射仪、扫描电子显微镜和傅里叶变换红外光谱仪等测试技术对薄膜的微结构进行了表征.实验结果表明,通过不同温度的退火处理,P(VDF-TrFE)铁电薄膜的结晶度随着退火温度的升高而不断提高,并且一定的温度范围内的退火处理可以提高薄膜的极化性能;此外,P(VDF—TrFE)铁电薄膜性能还表现出一定的环境湿度的敏感特性 ...
杜晓莉, 张修丽, 刘宏波, 季鑫
semanticscholar   +1 more source

Ultrahigh‐Strength Soft‐Magnetic NiFeCoAl Multi‐Principal Element Alloys Enabled by Multiscale Heterostructure Design

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Soft‐magnetic materials (SMMs) are indispensable for electrification and sustainable energy systems, yet their inherent mechanical fragility fundamentally limits applications under severe mechanical stresses. Enhancing the yield strength of SMMs is essential to prevent the degradation in magnetic performance and failure from plastic ...
Nairan Wang   +6 more
wiley   +1 more source

一款工艺编码器控制电路的抗总剂量性能研究

open access: yesHe jishu
针对一款采用环栅加固方法自主设计研制的BCD(Bipolar-CMOS-DMOS)工艺光电编码器控制电路,开展了电离总剂量(Total Ionizing Dose,TID)辐射效应研究。为揭示编码器辐射损伤机理,设计编码器总体电路及电路中的不同模块,通过对总体电路与模块电路的测试,比较电路各部分输出参数受总剂量辐照的影响规律。结果表明,辐照中编码器电路分模块出现不同程度的输出特性退化,但总体输出在总剂量5 Mrad(Si)范围内依旧保持稳定。结合仿真的方法 ...
许 世萍   +9 more
doaj   +1 more source

"fordi før så skreiv æ Å-G". En studie om andreklassingers valg av stavemåter.

open access: yes, 2023
The purpose of this master's thesis has been to look at the choices students in Year 2 make when spelling words. The students participating in this research are in the transition between phonological and orthographic writing, and the study will focus on how these students adopt different spelling strategies. The assignment's data material is taken from
openaire   +1 more source

In situ Laser Raman Spectroscopic Study on the Etching Processes of the Silicon [PDF]

open access: yes, 1998
硅是应用最广泛研究最系统和深入的半导体材料,人们一直进行着不懈的 努力,以便从更深层次上认识硅的性质,进一步发掘其应用的潜力从而得到性 能更好的硅基微光电子器件和微电机械系统.由于硅表面的键合形式如Si: O,Si:H,Si:F)明显影响甚至决定了硅的一系列物理和化学性质以及随后对它 的加工工艺,因此,对硅表面结构和刻蚀过程的正确表征以及有选择性地控制表 面的键合形式成了认识硅和加工硅的关键.谱学技术(如IR,EELS,Raman光谱) 具有表征具体分子的能力,是研究半导体表面的重要手段 ...
刘峰名
core  

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