排序方式: 共有7条查询结果,搜索用时 0 毫秒
1
1.
Under the background of college entrance examination reform, it becomes imperative to improve the students' interest in chemistry. During the effort to investigate how to present the chemistry knowledge, to cultivate and promote students' interest and professional attitude towards chemistry, we developed the public science education laboratory of College of Chemistry and Materials Science, Northwest University. In the current paper, we introduced the background of setting-up, the missions and targets of the laboratory, as well discussed the construction, evaluation systems and prospection of the laboratory. 相似文献
2.
Influence of intensity on the steady and transient state space—charge fields in photorefractive polymers 下载免费PDF全文
We have proven theoretically that there are sublinear,linear and superlinear relations between the response rates and total incident intensity for different cases of traps in photorefractive polymer materials.These relations were observed in inorganic photorefractive crystals many years ago.Also,the steady-state space-charge field is a function of the total incident intensity,which has also been found in inorganic photorefractive crystals.We have measured the relations of the steady-state diffraction efficiency and the response rate with respect to the total incident intensity in the photorefractive composite consisting of the polymer (N-vinylcarbazole) (PVK) doped with 4,4‘-n-pentylcyanobiphenyl (5CB) and C60.The results obtained show that the composite belongs to the case of low trap density. 相似文献
3.
Grey-grey incoherently coupled spatial soliton pairs in guest-host photorefractive polymers 下载免费PDF全文
We show that incoherently coupled grey-grey spatial soliton pairs can be established in guest-host photorefractive polymers under steady-state conditions, provided that their carrier beams have the same polarization, wavelength, and are mutually incoherent. The properties of these soliton pairs, such as their width and polarization, are discussed in detail. 相似文献
4.
5.
6.
7.
1