The novel concept of spectral diffusivity is introduced to analyze the dissipative properties of continua. The dissipative components of a linear system of evolution equations are separated into noninteracting parts. This separation is similar to mode analysis in wave propagation. The new modal quantities characterize dissipation and are best interpreted as effective diffusivities, or, in case of the heat conduction, as effective heat conductivities of the material.

中文翻译：

---

耗散的光谱特性

引入光谱扩散率的新概念来分析连续介质的耗散特性。线性演化方程系统的耗散分量被分成不相互作用的部分。这种分离类似于波传播中的模式分析。新的模态量表征耗散，最好将其解释为有效扩散率，或者在热传导的情况下，解释为材料的有效热导率。