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本文研究规划环评在低碳建设中的应用。构建基于低碳理念的环评指标体系,探寻运用层次-灰色关联方法完善规划环评指导性建议的新思路。以广元市"十二五"国民经济和社会发展规划环评为例,运用指标体系综合评价方法判定"十二五"规划对该区域低碳可持续发展的导向性作用。通过对构建低碳产业体系、调整三产结构和优化能源结构三个低碳方案的指标综合评价结果排序,明确广元市在低碳建设过程中,优化能源结构工作促进地区可持续发展的效果将最为显著。 相似文献
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The chromatic dispersion( CD) degrades themodulation-phase relationships of lightwave signals,reducing information-carrying capacity through pulse-broadening in digital networks and distortion in analogsystems[1,2]. The widespread use of dense wavelengthd… 相似文献
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单模光纤的色散和损耗特性测量系统 总被引：1，自引：1，他引：0
光纤的色散引起传输信号的畸变,而损耗则引起光能的衰减,因此色散和损耗在很大程度上决定了光传输系统的通信容量和中继距离.目前长距离、大容量光纤通信系统中多采用单模光纤,故测量单模光纤的色散和损耗特性非常重要.简要分析了光纤的色散和损耗的概念,然后分别介绍了用相位移法和插入法测量单模光纤的色散和损耗的实验方法与系统.该实验系统可以同时满足单模光纤的色散和损耗特性测量需要,设备简单、集成度高、成本低、操作简便. 相似文献
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A discrimination measurement method and demodulation technique for fiber Bragg grating （FBG） sensors were presented using digital filtering technique. The system can control a tunable fiber Fabry-Perot filter with sawtooth wave voltage generated by digital clock to interrogate FBG sensors. Using the analogue digital converter （ADC）, the reflected FBG signals were sampled with synchronous digital clock. With the aid of digital matched filtering technique, the sampled FBG signals were processed to obtain the maximum signal-to-noise ratio （SNR） and the Bragg wavelength shift from the FBG signals was recovered. The results demonstrate that this system has a scanning range of 1 520 nm-1 575 nm,and the wavelength detection accuracy is less than 2 pm with 1.5 Hz scanning frequency. 相似文献
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