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Updated: Jun 28, 2026

Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
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在2022年北京冬季奥运会期间,利用LiDAR垂直观测网络和机器学习模型构建PM2.5度的3D空间分布

Zenan Wang1, Yan Xiang1, Ying Pan2

  • 1State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601 Anhui, China.

Environment international
|October 23, 2025
PubMed
概括

中国的区域空气污染,特别是PM2.5,在中国.

关键词:
深度学习是一种深度学习.激光雷达测试 (LiDAR) 网络可以机器学习是机器学习.在PM中{2.5)量化传输是一种量化传输.三维的反转变形.

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Linear Approximations01:23

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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...