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Updated: Jun 10, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
07:14

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Published on: December 20, 2016

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使用融合技术和机器学习框架,对中国大陆高分辨率地面NO2度的长期时空模式进行定量重建

Zhen Li1, Heng Dong2, Sicong He2

  • 1School of Resources and Environment Engineering, Wuhan University of Technology, Wuhan 430070, China; State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430079, China.

Environment international
|July 18, 2025
PubMed
概括

这项研究融合了卫星数据,为中国创建了一个高分辨率的二氧化 (NO2) 估计模型. 该模型准确地跟踪NO2污染,揭示城市和季节性差异.

关键词:
累积分布函数 (CDF) 是一个累积分布函数.数据融合数据融合长时间序列长时间序列.机器学习 (ML) 是指机器学习.接近表面的NO2地区划分区域划分

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Linear Approximations01:23

Linear Approximations

For a differentiable function of two variables, linear approximation estimates values near a known point by replacing the curved surface with its tangent plane. Consider the function\begin{equation*}f(x,y)=x^2+3y^2\end{equation*}near the point (2, 1). The exact value at this point is f(2, 1) = 22 + 3(1)2 = 4 + 3 = 7.The linear approximation of f(x, y)) near (a, b) is\begin{equation*}L(x,y)=f(a,b)+f_x(a,b)(x-a)+f_y(a,b)(y-b)\end{equation*}First, compute the partial derivatives: fx(x, y) = 2x and...