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相关概念视频

Precipitation Gravimetry01:03

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...

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相关实验视频

Updated: Jul 12, 2026

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
11:49

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

Published on: April 10, 2019

关于中层层层金属流星沉积的Lidar观测.

T J Kane, C S Gardner

    Science (New York, N.Y.)
    |February 26, 1993
    PubMed
    概括

    大气物理学家使用激光雷达研究流星轨迹,发现它们的垂直分布与现有模型不同. 这表明实际流星流入中层可能高于此前估计的水平.

    科学领域:

    • 大气物理大气物理学
    • 地质化学 地质化学
    • 星球科学 星球科学

    背景情况:

    • 地中层的和铁层 (80-110公里) 是中断期化学和动态的关键标志物.
    • 这些金属起源于流星蚀,现有的资料基于模型和对电离轨迹的雷达观测.

    研究的目的:

    • 从单个石中直接测量中性金属原子的剥离概况.
    • 为了将激光雷达观察到的废弃形状与现有模型和雷达数据进行比较.
    • 为了估计流星碎片的流入到中层层.

    主要方法:

    • 使用高功率共振光激光雷达技术观察中性金属原子轨迹.
    • 在多个地点分析了101个和5个铁流星轨道在4年的垂直分布.
    • 计算的废弃形状和估计的流星流入速度.

    主要成果:

    • 观测到的流星轨迹呈现高斯垂直分布,中心高度为89.0公里,RMS宽度为3.3公里.
    • 直接测量到的废弃形状与平均铁层形状非常相似,但与现有的模型和雷达数据有很大的差异.
    • 石流入的下限估计为每年2.0 (+/-0.6) 千兆克.

    结论:

    更多相关视频

    Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
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    Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

    Published on: September 11, 2016

    相关实验视频

    Last Updated: Jul 12, 2026

    A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
    11:49

    A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

    Published on: April 10, 2019

    Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
    10:30

    Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations

    Published on: September 11, 2016

    • 直接的激光雷达测量提供了比当前模型更准确的剥离概况.
    • 这项研究表明,最近的报道可能低估了年度流星流入中层的总量.
    • 利达观测突显了考虑更大的流星对于准确的流入估计的重要性.