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取定具下述性质的函数r(x)∈C∞(R):(i),τ(x)=τ(-x),(ii)0≤τ(x)≤1,(iii)τ(x)=1,当|x|≤1/2,(iv)τ(x)=0,当|x|≥1.单位序列{τn(x)},x∈Rm和n∈Im,定义作τm(x)=τ(x1/n1)…τ(xm/nm),n1,…,nm=1,2,….空间D’(Rm)中分布f和g的中性卷积fg定义作序列{fn*g}的极限,其中fn=f·τn.作者给出了一些新的卷积. 相似文献
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Microwave magnetic properties are studied for rhombohedral structure Nd2Fe17N3-δ with planar magnetic anisotropy. Its resin composites show the permeability μ'0 = 4.15 at low frequency, the natural resonance frequency fT = 1.71 GHz and the resonance bandwidth 6.66 GHz. The calculated static permeability of Nd2Fe17N3-δ reaches 133. The microwave magnetic properties are determined by the c-axis anisotropy field, basal plane anisotropy field and high saturation magnetization. Based on microwave measurement and theoretical fitting on complex permeability spectra, Nd2Fe17N3-δ may be a promising microwave absorber with bandwidth wider than traditional hexaferrites materials in GHz ranges. 相似文献
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