Abstract: The invention provides a composite polymer film material based on a tungsten/copper/sulfur cluster compound, a preparation method and use thereof. The cluster compound has a chemical formula of: [RWS3Cu2(La)]n(M)n, wherein R is tris(3,5-dimethylpyrazolyl)hydroborate, tris(pyrazolyl)hydroborate, or pentamethylcyclopentadienyl; La has a structural formula of: when M is perrhenate, n is 4; and when M is triflate, n is 6. The synthesis process of the cluster compound is simple and controllable. A tetrahedral and an octahedral tungsten/copper/sulfur cluster compound that are good third-order nonlinear optical (NLO) active species are selectively synthesized by using different cuprous salts. Composite polymer films of various layers are prepared by spin coating. Such films, as flexible, portable and easy-to-process solid materials, are applicable to third-order NLO devices.

Abstract: The invention discloses a multi-version control method for data documents, and a device thereof. The method comprises generating data-block fingerprints for all data blocks of a benchmark version; determining common data contents common between a newer version and the benchmark version according to the data-block fingerprints, and indexing the common data contents; determining the data contents peculiar to the newer version, i.e. not contained in the benchmark version according to the indexes, and indexing these particular data contents; determining positions of these data contents in the newer version according to the indexes; determining the data blocks with identical data contents between the two versions through the comparisons of data-block fingerprints and data contents; extracting the data contents common between the two versions, the data contents peculiar to the newer version, as well as the positions of the data contents in the newer version.

Abstract: The invention discloses a multi-version control method for data documents, and a device thereof. The method comprises generating data-block fingerprints for all data blocks of a benchmark version; determining common data contents common between a newer version and the benchmark version according to the data-block fingerprints, and indexing the common data contents; determining the data contents peculiar to the newer version, i.e. not contained in the benchmark version according to the indexes, and indexing these particular data contents; determining positions of these data contents in the newer version according to the indexes; determining the data blocks with identical data contents between the two versions through the comparisons of data-block fingerprints and data contents; extracting the data contents common between the two versions, the data contents peculiar to the newer version, as well as the positions of the data contents in the newer version.