Results 51 to 60 of about 826,422 (147)
本文依据黄土高原地区由于水肥二因子不协调而导致大面积低效林这一现状,以水肥耦合为中心,以一龄杨树幼苗为研究对象,采用三因子五水平正交旋转组合回归设计方法,利用盆栽试验和定量分析的手段,研究探讨了不同水肥条件下,水、N、P、三因素对杨树生物量效应、N肥利效率以及水分利用效率的影响。结果表明: 1 在本试验条件下,各因素对杨树生物量影响的作用大小顺序是:含水量>施P量>施N量,含水量是影响杨树生物量的主要因素。各因素对杨树生物量交互作用的影响顺序是 ...
王力
core
ABSTRACT Non‐noble metal oxygen electrocatalysts are essential for low‐cost rechargeable metal‐air batteries and fuel cells, determining their energy conversion efficiency. However, such electrocatalysts are limited by inadequate bifunctional activity and stability toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).
Lixin Sun +14 more
wiley +1 more source
ABSTRACT Regulating oxygen vacancies (Ov) in SnO2 to facilitate high‐efficiency carbon dioxide electroreduction reduction reaction (CO2RR) is still a significant challenge. Therefore, a strategy based on Ag‐induced interfacial electron transfer was proposed to modulate Ov in SnO2 for CO2 electroreduction. The prepared Ag/SnO2 with an optimal Ov content
Haoyu Qi +7 more
wiley +1 more source
能源短缺和环境污染问题的日益严重使得开发和使用清洁能源越来越受到重视,因此开发高活性、高选择性的高效纳米功能材料变的尤为重要。近年来二维(2D)纳米材料的迅速发展为设计合成具有特殊性质和各种功能的新型纳米复合材料提供了新的契机。2D金属氧化物纳米片的高度各向异性和超薄厚度使其具有特殊的电子结构和物化性质,大量暴露的表面原子也使其易于进行修饰、杂化和组装,所获得的复合材料不仅具有可调的物化性质,且各组分间的协同耦合作用还能产生很多奇异的表界面性质和功能。本论文的研究从金属氧化物纳米片入手,将其与石墨烯、
刘鹤
core
ABSTRACT Reflection loss (RL) ≤ −15 dB (corresponding to 96.875% electromagnetic energy absorption), a core metric for moderate‐ to high‐temperature (< 600°C) electromagnetic protection materials, is critical for ensuring the reliability of aerospace high‐temperature structural components.
Chunyan Ding +10 more
wiley +1 more source
ABSTRACT A central challenge in high‐performance photoelectrochemical (PEC) systems is mitigating the intrinsic limitations in photogenerated carrier separation and transport, while enabling efficient broad‐spectrum solar harvesting. Inspired by the synergistic effect between plasmonic resonance and heterojunction built‐in electric fields, a ternary ...
Yuhan Zhang +8 more
wiley +1 more source
ABSTRACT Common methods of lignocellulose pretreatment (such as acid method, alkali method, and organic solvent method) have been severely restricted in their development due to issues such as harsh reaction conditions, high cost of reagents, and heavy environmental burden.
Weirong Li +9 more
wiley +1 more source
ABSTRACT Magnetic particles coated with carbon shells have been considered as promising electromagnetic wave absorption materials with antibacterial features. However, how to precisely control the monodispersed magnetic nanoparticles on a carbon matrix to manipulate impedance matching and antibacterial performances is still a key challenge.
Xiaofei Li +10 more
wiley +1 more source
针对单轴压缩实验,根据颗粒增强金属基复合材料中颗粒和基体两相的局部变形协调条件,并通过简单的位错模型,确定出与变形协调相应的几何必需位错密度,进而导同一种颗粒强化-应变梯度律。从中可以清楚地看出,颗粒增强金属基复合材料的强化由材料的微结构特征几何参数l和基体应变梯度联合控制。对于颗粒含量一定的复合材料,颗粒越小,应变梯度越高,强化效果越好。这一结果揭示了,颗粒强化及尺寸效应主要是通过应变梯度效应来表现的。这也同时说明 ...
白以龙, 戴兰宏, 凌中
core +2 more sources
ABSTRACT Bimetallic structures fabricated by laser powder bed fusion (LPBF) provide an effective strategy for achieving multifunctional integration, yet interfacial structural continuity and the role of lattice defects remain insufficiently understood.
Jinguo Ge, Shuo Yin
wiley +1 more source

