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毕节地区土地资源的退化及防治对策 被引量:5
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作者 张小林 郭厚祯 《水土保持通报》 CSCD 北大核心 1995年第1期48-53,共6页
位于黔西北云贵高原屋脊地段的贵州省毕节地区,近年来水土流失严重,土地石化、地力减退、下等田土增多,造成农业生产停滞不前。针对这种情况,笔者在分析土地资源退化原因的基础上,提出了实行耕地资源保护政策,改造坡耕地,开展以... 位于黔西北云贵高原屋脊地段的贵州省毕节地区,近年来水土流失严重,土地石化、地力减退、下等田土增多,造成农业生产停滞不前。针对这种情况,笔者在分析土地资源退化原因的基础上,提出了实行耕地资源保护政策,改造坡耕地,开展以小流域为单元的综合治理,调整用地结构和控制人口增长等防治措施。 展开更多
关键词 水土流失 土地资源 退化 防治 毕节地区
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A Program Study of the Union of Semilattices on the Set of Subsets of Grids of Waterloo Language
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作者 Mikhail E. Abramyan Boris F. Melnikov 《Journal of Applied Mathematics and Physics》 2023年第5期1459-1470,共12页
The aim is to study the set of subsets of grids of the Waterloo language from the point of view of abstract algebra and graph theory. The study was conducted using the library for working with transition graphs of non... The aim is to study the set of subsets of grids of the Waterloo language from the point of view of abstract algebra and graph theory. The study was conducted using the library for working with transition graphs of nondeterministic finite automata NFALib implemented by one of the authors in C#, as well as statistical methods for analyzing algorithms. The results are regularities obtained when considering semilattices on a set of subsets of grids of the Waterloo language. It follows from the results obtained that the minimum covering automaton equivalent to the Waterloo automaton can be obtained by adding one additional to the minimum covering set of grids. . 展开更多
关键词 Nondeterministic Finite Automata Universal Automaton Basic Automaton Grid Covering Automaton Equivalent Transformation Algorithms water-loo Automaton
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