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1. The recent advances of photochromism in optical storage field are summarized with the examples of organic and biological materials.

2. The photochromism were signed by UV-Vis spectrum. Meanwhile the influences for the structures of phenoxyanthraquinones to the photochromism were discussed.

3. Mechanism of reaction and photochromism of the radical is also introduced.

4. Specification: Good photochromism, needless to use additional ballast and used as a substitute for incandescent bulb.

5. The photochromism and the application of photochromic material in military field as optical information storage materials and camouflage material etc.

6. Photochromism of complex undergoes electron transfer reaction on light to form multivalent molybdenum complex and accompanied by a color change from purple to blue.

7. The photochromism was reviewed and several preparation methods of nanostructured WO3 thin films were compared.

8. This chapter simply introduces the application of pyrrole and pyrrole' derivatives in medicine, pesticide, biology, polymer material and photochromism.

9. So it was necessary to avoid the interference of thermal energy when test azo compound's photochromism.

10. Two kinds of chromic material, reversible thermochromism material and reversible photochromism material were introduced and summarized.

11. Multilevel laser power modulation is a key technology in multilevel optical data storage systems based on photochromism.

12. The sample solutions were irradiated by light from a high pressure mercury lamp(125 W). Photochromism property in solution was investigated by UV-Vis spectroscopy.

13. These successful applications demonstrate that two-dimensional FTIR spectroscopy may be a convenient and effective means in the study of the mechanism of photochemical photochromism.

14. They can be applied to molecular optical switches of high storage density, high switching rate, and high write erase cycle times based on their photochromism.

15. The photochromic properties and the effect factor of the photochromism and photochromic mechanism of hybrid material had been studied.

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16. The recent application of Schiff bases in medicine, catalytic chemistry, analytical chemistry, corrosion and photochromism are all briefly summarized.

17. The studies on the thin films containing polyoxometalates have drawn more and more attention owing to their potential applications in luminescence, photochromism, magnetism, electrics and catalysis.