共查询到20条相似文献,搜索用时 15 毫秒
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When a strong electric field is applied to nonconducting matter, narrow channels of plasma called streamers may form. Branchlike patterns of streamers have been observed in anode directed discharges. We explain a mechanism for branching as the result of a balance between the destabilizing effect of impact ionization and the stabilizing effect of electron diffusion on ionization fronts. The dispersion relation for transversal perturbation of a planar negative front is obtained analytically when the ratio D between the electron diffusion coefficient and the intensity of the externally imposed electric field is small. We estimate the spacing lambda between streamers and deduce a scaling law lambda approximately D(1/3). 相似文献
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Gray WG Miller CT 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》2000,61(2):2150-1;discussion 2152-3
A new method to model unsaturated flow in porous media was presented in Phys. Rev. E 58, R5245 (1998). We analyze the proposed approach and illustrate some significant shortcomings. 相似文献
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Mitkov I Tartakovsky DM Larrabee Winter C 《Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics》2000,61(2):2152-2153
In our work [Phys. Rev. E 58, R5245 (1998)] we introduced a dynamic phenomenological approach to model propagation of localized wetting fronts in porous media. Gray and Miller in their Comment [Phys. Rev. E 61, 2150 (2000)] criticize our approach on several issues. The main criticism addresses the problem of mass conservation in our model. In this Reply we argue that their criticism is incorrect. 相似文献
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Kulikovsky AA 《Physical review letters》2002,89(22):229401; author reply 229402
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Berakdar J 《Physical review letters》2004,92(14):149301; author reply 149302
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Gamero-Castaño M 《Physical review letters》2008,101(5):059401; author reply 059402
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Using laser-induced fluorescence-dip Stark spectroscopy, we performed time-resolved, direct measurements of electric-field strengths during the breakdown phase of a low-pressure, pulsed discharge in xenon. With this experimental technique we could for the first time quantitatively measure the time evolution of the driving force of the plasma breakdown process: the electric field. Moving ionization fronts were measured with submicrosecond resolution. These ionization fronts were sustained by a spatially narrow, rapidly moving region of strong electric field. 相似文献
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Comment on "negative refraction at optical frequencies in nonmagnetic two-component molecular media"
Ramakrishna SA 《Physical review letters》2007,98(5):059701; discussion 059702
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Plenz D 《Physical review letters》2005,95(21):219801; author reply 219802
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