Results 21 to 30 of about 11,958 (123)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Lightweight and lead‐free radiation shielding materials remain urgently needed. This work designed a fluorite high‐entropy oxide (FHEO) system through a combined computational–experimental route. Density functional theory based on special quasi‐random structures was used to identify thermodynamically stable fluorites from a wide compositional ...
Xiangjie Duan +9 more
wiley +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Ceramic reinforcement is crucial for crafting ultrastrong and wear‐resistant metallic components. However, pronounced stress concentration and strain incompatibility at ceramic–metal interfaces often trigger microcrack initiation and ceramic spalling exacerbating friction under sliding conditions.
Dongting Li +8 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2019 【目的】观察miR-34a在低氧诱导的大鼠肺动脉平滑肌细胞增殖中的作用并探讨其可能的机制。【方法】原代分离和培养大鼠肺动脉平滑肌细胞（PASMC），并给予3%低氧处理后，用Real-time PCR法检测miR-34a和Notch1mRNA在大鼠PASMC中的表达；低氧条件下用细胞转染法过表达和抑制miR-34a、沉默Notch1基因的表达后用EDU法观察细胞增殖情况，并用Real-time PCR和Western blot法检测细胞核增殖抗原PCNA的表达。【结果】分离和培养大鼠PASMC并给予3 ...
马兰
doaj
Dianci bileiqi, 2020 通过改变氧化锑的含量,分析不同含量对氧化锌电阻片电位梯度、泄漏电流等性能的影响。氧化锑在烧结过程中与氧化锌可以形成尖晶石相,可以抑制氧化锌晶粒尺寸的大小,进而调整电阻片电位梯度。在传统五元配方体系中,通过改变氧化锑的增加,电阻片收缩率逐渐增大,致密度逐渐增加;掺杂适量的氧化锑可以提高电位梯度,降低泄漏电流;掺杂过量的氧化锑会降低电位梯度。
刘亚芸, 厍海波, 杨军, 刘明新
doaj
Cu‐Based Catalysts Design Toward Electrochemical CO2 Reduction to Valuable Multi‐Carbons Products
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Electrochemical reduction of CO2 to multi‐carbon products (e.g., C2+, ethene, ethanol, etc.) not only effectively decreases the CO2 concentration in atmosphere but also shows great potential economic benefits due to these exploitable value‐added products. The Cu‐based catalysts have caught much attention in CO2 electroreduction due to the good
Li‐Qing Li +5 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban目的应用纳米孔长读长测序技术，深入分析正常肝实质细胞和肝癌细胞在低氧环境下的特异性转录组变化，以期阐明肿瘤细胞在低氧条件下生存与转移的内在机制，从而为肿瘤的精准靶向治疗开辟新的视角与策略。方法实验选取正常肝实质细胞系THLE-3与肝癌细胞系Hep3B作为研究对象，分别置于常氧与低氧条件下培养48 h后，提取其总RNA。随后，采用纳米孔测序技术，对这两种细胞系在不同氧浓度下的转录组进行高通量、高精度的测序分析。结果本研究成功构建了基于纳米孔三代测序技术的低氧转录本数据集，展现了前所未有的测序精度。通过GO（
高力, 沈晟齐, 高平
doaj +2 more sources
Zhongguo shiyan zhenduanxue, 2004 目的研究亚低温状态下,大鼠急性脑缺血时氧自由基超氧化物歧化酶（SOD）和一氧化氮（NO）、一氧化氮合酶（NOS）的改变,探讨亚低温对缺血脑组织的保护机制。方法将45只Wistar大鼠随机分为9组,假手术组5只,缺血组及亚低温组又根据缺血、亚低温时间不同分为3h、24h、48h、72h亚组（各组均为5只）。动物模型参照Longa、Koizumi和刘亢丁等人的方法,采用颈内动脉线栓法制备大脑中动脉闭塞（MCAO）模型。结果比较缺血组和亚低温组,可见亚低温组栓塞侧脑组织SOD的生成和释放明显增加 ...
孙宏霞, 付铁娟, 刘亢丁
doaj
Zhejiang Daxue xuebao. Lixue ban利用欧洲中期天气预报中心（ECMWF）第五代再分析资料ERA5，通过统计分析与合成分析方法，研究了不同季节青藏高原臭氧的垂直输送特征及其对臭氧分布的影响。结果表明：夏季，高原地区臭氧主要呈向上输送特征，垂直通量约为1×10⁻9 kg·m⁻²·s⁻¹；冬季，臭氧输送方向反转，表现为从平流层向近地面的向下输送，垂直通量约为3×10⁻9 kg·m⁻²·s⁻¹。在空间分布上，夏季同一高度臭氧浓度随纬度的增加而逐渐升高；冬季，在300 hPa以上高度，臭氧浓度随纬度的增加而升高，而在300 ...
金展(JIN Zhan) +5 more
doaj +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Sodium metal batteries (SMBs) are regarded as promising candidates for next‐generation energy storage systems owing to their high theoretical energy density and low cost. However, their practical development is hindered by the instability of the electrode–electrolyte interphase (EEI), particularly under high‐voltage operation.
Xingyu Yang +10 more
wiley +1 more source