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variations on electrical behavior of a neocortical neuron model . Acta Biol. Hung. 65 , 379 – 384 . 6. Shirahata , T. ( 2015 ) Numerical study of a mathematical

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384 Chase, R. (2002) Behavior and its neural control in gastropod mollusks. Oxford Univ. Press. Crozier, S., Trakic, A., Wang, H., Liu, F. (2007) Numerical study of

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Spencer, H. G. and Marks, R. W. (1988): The maintenance of single-locus polymorphism. I. Numerical studies of a viability selection model. Genetics 120 :605-613. The maintenance of single-locus polymorphism. I. Numerical studies

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): Numerical study of pulsating flow through a tapered artery with stenosis . Chinese J. Phys. , 42 , 401 – 409 . Lorenz , E.N. ( 1987

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The current Hungarian Soil Classification System (HSCS) was elaborated during the 1960s, based on the genetic principles of Dokuchaev. It was developed before sufficient data and modern data processing tools were available and served different purposes than current users need or apply it for.The central unit is the soil type, grouping soils that were believed to have developed under similar soil-forming factors and processes. The major soil type is the highest category that groups soils based on climatic, geographical and genetic bases. Subtypes and varieties are distinguished according to the assumed dominance of soil-forming processes and observable/measurable morphogenetic properties. STEFANOVITS (1963) defined the 23 soil-forming processes that have a dominant impact on the differentiation of the 39 soil types of the system.Based on accumulated data and experience, as well as on numerical tools for defining taxonomic relationships a modernization process was carried out. The process included: linking processes to diagnostics, review and numerical study of similarities and dissimilarities of existing units, development of new central units, development of a computer assisted key, and definition of methodology to derive the lower level units. The new, 15 soil types are defined by stronger morphogenetic and measurable criteria, but with the application of legacy data and the developed key, the earlier units can be converted to the new ones, hence the value of legacy data can be preserved.

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