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搭建一个双向拉曼放大超长跨距光纤传输系统,在接收端采用非线性补偿算法来补偿因传输距离长和入纤光功率高所带来的光纤非线性效应,并通过实验成功实现了10Gbaud/s 16正交幅度调制（QAM）信号的传输,传输距离为300km。仿真和实验结果表明,通过采用非线性补偿算法,接收端信号的性能相比未使用非线性补偿算法时提高了2dB。证明了非线性补偿技术在超长跨距光纤传输系统中是非常有效且必要的。

本文评述了国内外分布反馈激光器、半导体光波导调制器及其单片集成器件的研究现状、发展趋势和应用情况。

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LaFe0.5Co0.5O3 catalyst was synthesized by sol-gel method. The catalytic performance and mechanism of LaFe0.5Co0.5O3 for Orange Ⅱ degradation in the present of H2O2 were studied under the condition of pH=3 and 254 nm UV irradiation. The results showed that the decolorization rate of Orange Ⅱ reached 99. 5% after 60 min reaction, the "first" kinetic rate constant of Orange Ⅱ decolorization was 0. 078 min-1, and the TOC removal efficiency was 81. 60% after 180 min treatment. The results of cyclic experiments and physical and chemical characterization of catalyst showed that LaFe0.5Co0.5O3 had high catalytic ability and good structural stability. Based on the results of free radical quenching experiment and analysis of concentration change of total iron ion, ferrous ion, H2O2 and ·OH, it was proved that the catalytic mechanism of LaFe0.5Co0.5O3 included photo-excitation, hole oxidation, superoxide radical oxidation, photoelectron reduction of iron ion, ferrous ion release, homogeneous Fenton reaction and iron ion readsorption processes. In this system, Orange Ⅱ was degradated through synergistic action of Fenton reaction and photocatalytic reaction. [ABSTRACT FROM AUTHOR]

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Based on the analysis of Orange II degradation in the heterogeneous UV-Fenton system with poly-silicate-ferric as catalyst, the accuracy between full-process linear fitting method and piecewise linear fitting method in calculating kinetic constant were compared．A kinetic model of Orange II decoloration was established and verified in terms of catalyst amount and hydrogen peroxide concentration．The results showed that in this heterogeneous UV-Fenton system, the decolorization process of OrangeII could be divided into two stages: rapid and slow decolorization stages using 15min as the dividing line．The rapid decolorization stage was mainly dominated by nitrogen double bonds breaking, and chromophore degradation as a supplement．While the slow decolorization stage was mainly dominated by chromophore mineralization, and nitrogen double bonds breaking as a supplement．The kinetic model based on two-stage linear fitting method had higher accuracy and smaller error in simulation, which could successfully predict Orange II degradation in this heterogeneous UV-Fenton system through theoretical calculation．This study would provide theoretical basis and technical support for the application of heterogeneous UV-Fenton system with poly-silicate-ferric as catalyst． [ABSTRACT FROM AUTHOR]

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The application of informatization technology to university laboratory management is an inevitable trend of the development of colleges and universities, and it is also an important symbol to measure the management level of colleges and universities. The information becomes the new support for the efficiency improvement of university laboratory management, and some innovations are brought. Under the background of informatization, based on the practical experience of the management of university laboratory low-value materials, this paper analyzes the present situation of laboratory low-value material shortage in universities, and deals with the significance of establishment of informatization management system. Combining with the exploration and the practice in Huaqiao University, this paper illustrates how to use advanced information technology, to regulate the management and build the information management platform such that the decentralized procurement of low-value materials can be concentrated checked and restored. By optimizing the management process, improving the efficiency of management, the standardization of laboratory low-value material, intensive and fine management are realized. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Chongqing University of Posts & Telecommunications (Natural Science Edition) is the property of Chongqing University of Posts & Telecommunications 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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With the expansion of the scale and scope of government procurement in colleges and universities, how to improve the competitive in the process of purchasing and embody the principle of openness, fairness and justice become the primary issue. From the conventional process of government procurement in colleges and universities, factors that affecting the principles of openness, fairness and justice including the division purchasing, set the orientation or exclusion clause, illegal interference review, malicious bid low,manipulation and so on are analyzed. Considering the feature of complex and specific of equipment in colleges and universities procurement, countermeasures including concrete elaboration of the government procurement system in colleges and universities, the purchase documents by experts to question formulation, dark mark audit, information-based measures during the procurement process are taken out. Practice shows that a series of measures to effectively curb the manipulation in the bidding, make up for the inadequacy of purchasing personnel quality, promote the procurement regulation. All the procurements for colleges and universities enter a more sunshine fair competition environment. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Veterinary Science / Zhongguo Shouyi Xuebao is the property of Chinese Society of Veterinary Science 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.)