An Explanation of the Liesegang Phenomenon     

VAN Oss CJ  Hirsch-Ayalon P 《Science (New York, N.Y.)》1959,129(3359):1365-1366

Periodic band precipitation in porous media is explained by means of the Hirsch effect (specific semipermeability of the precipitate occurring only as long as both the precipitate-forming ions are present). The possibility of getting Liesegang bands in immunological precipitates is underlined, and a suggestion is made how to avoid them.  相似文献   

IMPROVEMENT OF DEW-POINT DETERMINATION     

VAN DEN Akker JA  Wink WA 《Science (New York, N.Y.)》1943,97(2526):494

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一种测定土壤水分迁移率的方法研究     

M. P. C. ENGLER  R. CICHOTA  Q. DE JONG VAN LIER  E. M. BLOEM  G. SPAROVEK  E. SCHNUG 《土壤圈》2008,18(3):328-334

A new laboratory method was proposed to establish an easily performed standard for the determination of mobile soil water close to real conditions during the infiltration and redistribution of water in a soil. It consisted of applying a water volume with a tracer ion on top of an undisturbed ring sample on a pressure plate under a known suction or pressure head. Afterwards, soil water mobility was determined by analyzing the tracer-ion concentration in the soil sample. Soil water mobility showed to be a function of the applied water volume. No relation between soil water mobility and applied pressure head could be established with data from the present cxperiment. A simple one- or two-parameter equation can be fitted to the experimental data to parameterize soil water mobility as a function of applied solute volume. Sandy soils showed higher mobility than loamy＂ soils at low values of applied solute volumes, and both sandy and loamy soils showed an almost complete mobility at high applied solute volumes.  相似文献