在一些发达国家,计算机辅助教学(Computer Assisted Instruction,简称 CA I)已走出实验研究阶段,开始在大学基础教育,中小学部分课程的教学和辅导,幼儿学前教育,特别是在职业训练和继续工程教育中广泛应用。许多发展中国家也开始重视开...在一些发达国家,计算机辅助教学(Computer Assisted Instruction,简称 CA I)已走出实验研究阶段,开始在大学基础教育,中小学部分课程的教学和辅导,幼儿学前教育,特别是在职业训练和继续工程教育中广泛应用。许多发展中国家也开始重视开发和应用 CAI 技术。本文就国外一些国家和我国 CAI 的发展情况作简单的介绍。美国:最早开始 CAI 研究的是美国 IBM 公司。展开更多
Stratigraphy, the basis of geological dating was founded in the ⅩⅦ century on the three well known principles assumed by Stenon: superposition, continuity, original horizontality. These three principles came from a ...Stratigraphy, the basis of geological dating was founded in the ⅩⅦ century on the three well known principles assumed by Stenon: superposition, continuity, original horizontality. These three principles came from a postulate in sedimentology: layers of sub soil are strata of ancient successive sediments. Stratigraphy is, therefore,based upon data acquired from sedimentology.On the basis of successive observations and experiments this paper realises and verifies that Stenon’s stratigraphic model was not in line with experimental data because it had “overlooked” the major variable factor of sedimentology: the current and its chronological effects. The sedimentological process can, effectively, be divided into three phases: erosion, transport and deposit of sediments,with the liquid current being the vector of transport. Stenon’s stratigraphy only took into account the third phase of sedimentology, the deposit, implicitly assuming the velocity of current to be nil. The author of this paper simulated the constitution of layers of sediment generated at variable velocities from differing granulometries.He reincorporated the chronology of currents into the field of his scientific investigations, as it was indispensable for modelling all the interlinked sequences in sedimentology, stratigraphy and geological dating.The author introduced paleohydraulics as the new approach to geological dating to integrate the two ends of the chain,and refers to radiometric dating measures of eruptive rocks recognised as aberrant in relation to the date of eruption.Generally speaking,the new approach paleohydraulics brings about the establishment of experimental sedimentology and Stenon’s ⅩⅦ century postulate and principles are no more than interpretations that must be carefully checked with data from observation and the laboratory.展开更多
文摘在一些发达国家,计算机辅助教学(Computer Assisted Instruction,简称 CA I)已走出实验研究阶段,开始在大学基础教育,中小学部分课程的教学和辅导,幼儿学前教育,特别是在职业训练和继续工程教育中广泛应用。许多发展中国家也开始重视开发和应用 CAI 技术。本文就国外一些国家和我国 CAI 的发展情况作简单的介绍。美国:最早开始 CAI 研究的是美国 IBM 公司。
文摘Stratigraphy, the basis of geological dating was founded in the ⅩⅦ century on the three well known principles assumed by Stenon: superposition, continuity, original horizontality. These three principles came from a postulate in sedimentology: layers of sub soil are strata of ancient successive sediments. Stratigraphy is, therefore,based upon data acquired from sedimentology.On the basis of successive observations and experiments this paper realises and verifies that Stenon’s stratigraphic model was not in line with experimental data because it had “overlooked” the major variable factor of sedimentology: the current and its chronological effects. The sedimentological process can, effectively, be divided into three phases: erosion, transport and deposit of sediments,with the liquid current being the vector of transport. Stenon’s stratigraphy only took into account the third phase of sedimentology, the deposit, implicitly assuming the velocity of current to be nil. The author of this paper simulated the constitution of layers of sediment generated at variable velocities from differing granulometries.He reincorporated the chronology of currents into the field of his scientific investigations, as it was indispensable for modelling all the interlinked sequences in sedimentology, stratigraphy and geological dating.The author introduced paleohydraulics as the new approach to geological dating to integrate the two ends of the chain,and refers to radiometric dating measures of eruptive rocks recognised as aberrant in relation to the date of eruption.Generally speaking,the new approach paleohydraulics brings about the establishment of experimental sedimentology and Stenon’s ⅩⅦ century postulate and principles are no more than interpretations that must be carefully checked with data from observation and the laboratory.
