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光可变衰减器（VOA）作为波分复用（WDM）网络中关键的功率管理器件,能够实现信道均衡和自动增益控制功能.微电机械系统（MEMS）型和热光型VOA以其衰减范围宽、功耗低、体积小、易于集成等优点成为研究重点,热光特性极佳的聚合物材料则成为最引人注目的热光材料.文章对已有的VOA器件作了概括分类,介绍了各种MEMS型VOA,还从热光材料的角度,总结了聚合物材料的研究成果,对已见报道的基于聚合物的各种热光型VOA进行了重点的描述和分析.最后给出了VOA的两种网络实例.

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rock & Mineral Analysis is the property of Editorial Board of Rock & Mineral Analysis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Forensic Science & Technology is the property of Institute of Forensic Science, Ministry of Public Security and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rock & Mineral Analysis is the property of Editorial Board of Rock & Mineral Analysis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To evaluate the effeet of microRNA (miR)-200e on regulating cell proliferation, apoptosis and invasion by targeting ephrin Al (EFNA1) in gastric cancer cells. Methods SGC7910 cells were cultivated and randomly divided into miR-200c mimics group and mimics control group. which were then transfected by miR-200c mimics and mimics oligonucleotides. Cell proliferation was detected by CCK-8, apoptosis was determined by flow cytometry, and cell invasion was assessed using Transwell assay. The target relationship between miR-200e and EFNA1 was measured by the dual luciferase reporter gene system. Cancer and adjacent non-cancerous tissues were obtained from 48 patients who underwent gastrectomy at Guangzhou First Peopled Hospital, and the protein expression of EFNA1 was tested by immunohistoehemis-try. The relationship between EFNA1 expression and gender, age, smoking status, alcohol drinking, histological type, depth of invasion, lymph node and liver metastasis was assessed. Results Compared with the mimics control group, the proliferative activity of SGC7910 cells in the miR-200c mimics group was decreased, the whole apoptosis rate was increased and the invasive ability was decreased (all P <0. 05). The luminescence intensity was significantly decreased in miR-200e mimic transfected cells than in mimics control cells (P <0.05). and the luminescence intensity was significantly increased in miR-200c inhibitor transfected cells than in inhibitor control cells (P<0.05). EFNA1 was significantly up-regulated in the gastric cancer tissues as compared with that noted in the adjacent non-cancerous tissues. The high expression of EFNA1 was associated with lymph node metastasis (P <0.05), hut not associated with other clinicopathological characteristics (all P > 0. 05). Conclusion EFNA1 gene was highly expressed in the gastric cancer. miK-200c can inhibit gastric cancer cell proliferation and invasion, and enhance cell apoptosis by targeting EFNA1 gene. [ABSTRACT FROM AUTHOR]

OBJECTIVE: To probe into the effects of BCG polysaccharide nucleic acid on immune function and serum inflammatory factor level in patients with moderate and severe chronic obstructive pulmonary disease( COPD).METHODS: 72 patients with moderate and severe COPD admitted into Pingxiang the Third People’s Hospital from Jan.2015 to Sept. 2017 were extracted to be divided into observation group and control group via the simple randomization method, with 36 cases in each. The control group was given routine treatment such as long-acting β-receptor agonist, while the observation group additionally received BCG polysaccharide nucleic acid injection on the basis of the control group. After treatment of 3 months, changes of the serum inflammatory factor level[IL-8 and TNF-α ] and immune function index level[IgA, IgG and IgM]of two groups were observed. RESULTS: After treatment, the levels of IgA, IgG and IgM of observation group were significantly higher than those of before treatment and control group after treatment, with statistically significant difference( P < 0. 05). After treatment, the levels of IL-8 and TNF-α of observation group were significantly lower than those of before treatment and control group after treatment, with statistically significant difference( P < 0. 05). CONCLUSIONS: BCG polysaccharide nucleic acid injection can significantly improve the immune function in patients with moderate and severe COPD, reduce serum inflammatory factor level, reduce inflammation and help to improve the prognosis of patients. [ABSTRACT FROM AUTHOR]