How to calculate the synthesis operator is the key problem of controlled illumination prestack depth migration. In this paper the inverse time focusing operator is synthesized based on the traveltime calculation method of finite difference approach, and with this synthesis operator the authors calculate the focusing point controlled illumination prestack depth migration using Fourier finite difference. The test results of Marmousi model show its effectiveness and the great advantage of improving computational efficiency.

進行控制照明疊前深度偏移的關鍵是合成算子的選擇，筆者基于有限差分的走時計算方法合成了逆時聚焦算子，基于該合成算子利用傅里葉有限差分法進行了聚焦點控制照明疊前深度偏移，針對Marmousi模型的試算結果表明了該方法的有效性及其在提高計算效率方面的巨大優(yōu)勢黄色免费黄色网站。

Recent developments in the synthesis,modification and catalytic properties of titanium silicalite molecular sieve are reviewed,including the developments in the synthesis of TS-1 with hydrothermal and isomorphous replacement methods,the modification of TS-1,as well as applications in catalytic oxidation and acid catalysis systems.

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The experimental results indicate that methanol synthesis gas can be produced by steam gasification of lauan sawdust at 680℃ without catalyst addition. However, in the presence of steam reforming catalyst (RKNR+RKS-1), weight ratio of catalyst to dry wood sawdust =1, methanol synthesis gas can be produced at 580℃.

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In the paper the effects and main differences of maleic anhydride and acrylic acid in the synthesis of polycarboxylate superplasticizers are analyzed according to their respective characteristics and technical requirements for synthesis.

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Uses: Suitable for gas adsorption, the decolorization and refining of catalyst carriers and monosodium glutamate, citric acid and oil; used in catalyst of phosgene synthesis; as catalyst carrier for high mercury chloride, vinyl acetate synthesis, etc.

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Synthesis of mesitylene by catalytic alkylation of mixed C9 arenes and isobutene;2. Synthesis of trimesic from liquid phase oxidation of mesitylene by air

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Utilization of carbon dioxide and propylene as starting material for direct synthesis of methacrylic acid has an attractive alternative to organic synthesis, environmental protect and utilization of carbon.

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The majority of them are produced by fermentation using microorganisms of different species identified as species belonging to Aspergillus, Monascus, Nocardia, Amycolatopsis, Mucor or Penicillium genus, and some are obtained by treating the fermentation products using the methods of chemical synthesis or they are the products of total chemical synthesis.

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But because of the complexity and multiformity of the separation process synthesis itself, the actual theory and method can only solve some simple problems relatively, which exist lots of difficulties and deficiencies in the research of the separation process synthesis.

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But because of the complexity and multiformity of the separation-network synthesis itself,the actual theory and method can only solve some simple problems relatively,which exist lots of difficulties and deficiencies in the research of the separation-network synthesis.

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