Results 21 to 30 of about 45,674 (256)
Rare Metals, EarlyView.ABSTRACT To break electromagnetic wave absorption (EMA) tech's single‐attenuation bottleneck, enhancing multi‐wave absorption synergy in composites is key for microstructure design. This study uses mesoporous hollow carbon spheres to make metal nanospheres with cobalt, iron, and nickel nanoparticles, then encapsulates them via electrospinning into a ...
Wei‐Lian Zhang +10 more
wiley +1 more source
野生动物学报, 2022 为有效保护浙江长兴尹家边扬子鳄保护区扬子鳄(Alligator sinensis)种群,丰富野放扬子鳄的遗传多样性,利用13个微卫星标记分析了该种群的遗传多样性,比较核心区和野放区种群的遗传多样性差异。结果显示:保护区扬子鳄种群共检测到31个等位基因,其中含2个稀有等位基因。野放区种群的平均有效等位基因数量(1.82)、平均观测杂合度(0.49)、平均期望杂合度(0.43)、平均多态信息含量(0.34)和平均香农信息指数(0.64)均低于核心区(1.89、0.52、0.46、0.37和0.70 ...
方黎明 +8 more
doaj
Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
wiley +1 more source
Biodiversity conservation needs more research
Guangxi Zhiwu, 2023 联合国《生物多样性公约》第十五次缔约方大会（以下简称COP15）通过了《昆明-蒙特利尔全球生物多样性框架》（以下简称《昆蒙框架》），包括4个长期目标和23个行动目标（马克平，2023），为全球2030年前应对生物多样性丧失问题明确了目标和路径。近年来，中国实施了一系列生态文明建设的举措，包括国土空间规划、生态保护红线划定和管控、以国家公园为主体的自然保护地体系的建设等，率先实现了《昆蒙框架》中关于通过全域空间规划实现生物多样性主流化（行动目标1）、保护30%陆地面积（行动目标3）等重要目标，为国际社会 ...
Keping MA, Hai REN, Chunlin LONG
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Rare Metals, EarlyView.ABSTRACT Rare earth elements (REEs) play an irreplaceable role in modern technology and industry. However, due to the highly similar physicochemical properties among REEs, their separation remains a significant challenge. Additionally, REEs often exist in low‐concentration solutions, making efficient REE recovery an urgent task.
Miao‐Miao Huang +6 more
wiley +1 more source
Distribution Pattern of Taxonomic Diversity of Fish Community in Four Typical Mangrove Areas, China [PDF]
, 2016 红树林区不仅能为许多海生和陆生生物提供栖息地和食物，还是许多鱼类的育幼场和产卵场，因此红树林区生物多样性成为当今生态学研究热点之一。过去对红树林区鱼类群落的研究多采用传统生物多样性指数，然而传统生物多样性指数在实际运用过程具有过多注重物种丰富度、未考虑物种在分类学上的差异等缺陷。分类多样性指数既考虑了群落中物种数量和均匀程度，也考虑了物种分类地位和生态学上的差异，更全面更有说服力。 为全面了解中国红树林区鱼类物种多样性分布格局，本研究选取福建漳江口、广西茅尾海、广西山口、海南东寨港四个典型的红树林区 ...
陈杰
core
Rare Metals, EarlyView.ABSTRACT SnTe is considered a potential alternative to PbTe for thermoelectric applications. However, excessive carrier concentration and thermal conductivity result in poor thermoelectric performance. Herein, p‐type SnTe‐based materials Sn0.8‐xMn0.1Pb0.1SbxTe were synthesized, and the combined effects of Sb, Mn, and Pb were systematically investigated.
Jun‐Xiang Zhang +10 more
wiley +1 more source
, 2009 银鲫(Carassius auratus gibelio Bloch)由于其独特的遗传背景和繁殖方式而成为研究进化遗传学和选择育种的一个独特的模式生物。到目前为止,我们对新疆额尔齐斯河水系银鲫群体的多样性状况一直知之甚少。为了更好地了解额尔齐斯河水系银鲫群体的克隆多样性状况,本研究中,我们采集了来自新疆额尔齐斯河水系的4个鲫鱼群体。通过流式细胞术分析血细胞样品,结果证实这些鲫鱼均为三倍体银鲫。通过血清转铁蛋白电泳表型分析,我们从这些银鲫群体中鉴定出总共8个不同的克隆。在这些鉴定的克隆中,有4个克隆 ...
周莉, 李风波, 桂建芳
core
Novel Non‐Equimolar High‐Entropy Zirconates With Superior Thermophysical Properties
Rare Metals, EarlyView.ABSTRACT Rare‐earth zirconates (RE2Zr2O7) are promising candidates for topcoat materials in thermal barrier coatings (TBCs). However, their practical application in TBCs is limited by poor fracture toughness and low thermal expansion coefficient (TEC).
Taoyi Lu +7 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2014 城市湿地水质受人类活动影响，其水系浮游细菌群落多样性也因水质状况不同而变化.以杭州西溪湿地国家公园为研究区，分析人类活动特征差异对河道水质及浮游细菌群落多样性的影响，测定溶解氧、氨氮、硝氮、总氮、总磷等主要理化指标，运用聚合酶链式反应与变性梯度凝胶电泳(PCR-DGGE)技术，分析各水样中浮游细菌群落多样性，通过主成分分析与典型对应分析等统计手段，比较各项理化指标与细菌群落结构的相关性.研究结果表明：湿地河道水质受人类活动影响显著，呈中度~重度富营养化；河道水域内细菌群落总体多样性较高 ...
NIYanyan(倪燕燕) +6 more
doaj +1 more source