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1)  discrete line sources
离散线声源
2)  noise variance
噪声离散<声>
3)  noise variance
噪声离散
4)  Discrete noise
离散噪声
5)  acoustic source separation
声源分离
1.
This paper studies the basic problem of acoustic source separation, the separation of different characteristic frequencies.
文章中研究了知觉性声源分离的最基本的问题,即听觉对于不同频率成分特征声源的分离知觉。
6)  discrete heat sources
离散热源
1.
The conjugated convection-conduction heat transfer from a vertical steel plate with discrete heat sources simulating the heating pipes of the wrapped-type heat exchanger is investigated experimentally and numerically.
通过离散热源模拟板管式换热器的盘管,对竖直钢平板自然对流和导热的耦合传热进行了实验研究。
2.
Heat convection in the two-dimensional rectangle enclosure with asymmetric discrete heat sources are investigated numerically, and drew the conclusions that there are three ways to break off the linkage between the strong and the weak heat source, which are adding adiabatic partition in the enclosure, setting the cold air curtain and adopting cold air impinging jet.
对含有非对称离散热源的二维矩形方腔的对流传热进行数值模拟,得出以下三种方式可以切断强热源对弱热源影响的结论,即在腔体中加入绝热隔板、设置冷空气幕和通入冷空气的冲击射流,因而能够实现室内的非对称热环境。
3.
In this paper the natural convective heat transfer in a rectangle cavity was discussed and the cavity has five discrete heat sources on the vertical wall.
本文对顶部散热的矩形空腔内某一竖侧壁上存在有 5个离散热源时的自然对流换热问题求出了数值解。
补充资料:离散时间周期序列的离散傅里叶级数表示
       (1)
  式中χ((n))N为一离散时间周期序列,其周期为N点,即
  式中r为任意整数。X((k))N为频域周期序列,其周期亦为N点,即X(k)=X(k+lN),式中l为任意整数。
  
  从式(1)可导出已知X((k))N求χ((n))N的关系
   (2)
  式(1)和式(2)称为离散傅里叶级数对。
  
  当离散时间周期序列整体向左移位m时,移位后的序列为χ((n+m))N,如果χ((n))N的离散傅里叶级数(DFS)表示为,则χ((n+m))N的DFS表示为
  

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