地质灾害信息,尤其是滑坡灾害的多源性、模糊性、非确定性和随机性,使得信息处理和空间综合分析十分复杂。利用ArcG IS Engine的二次开发接口,结合地质灾害专业数学模型,包括模糊综合评判、多元回归分析、神经网络、信息量法4种模型,使...地质灾害信息,尤其是滑坡灾害的多源性、模糊性、非确定性和随机性,使得信息处理和空间综合分析十分复杂。利用ArcG IS Engine的二次开发接口,结合地质灾害专业数学模型,包括模糊综合评判、多元回归分析、神经网络、信息量法4种模型,使用栅格图层叠加方法,得出滑坡危险性评价图。克服了传统危险性评价成果缺乏直观性和可操作性,导致成果可靠程度的降低。本文主要尝试利用4种模型进行滑坡危险性区域评价,以秭归县某区域为原型,得到评价结果包括低、较低、较高、高4种。因此,建立地质灾害危险性评价的G IS系统是十分必要的。展开更多
In this paper,a new type of multi-wavelength fiber laser is proposed and demonstrated experimentally.Superimposed fiber grating(SIFG) and chirp fiber Bragg grating(CFBG) are used for wavelength selection.Based on gain...In this paper,a new type of multi-wavelength fiber laser is proposed and demonstrated experimentally.Superimposed fiber grating(SIFG) and chirp fiber Bragg grating(CFBG) are used for wavelength selection.Based on gain equalization technology,by finely adjusting the stress device in the cavity,the gain and loss are equal,so as to suppress the modal competition and achieve multi-wavelength lasing at room temperature.The experimental results show that the laser can output stable multi-wavelength lasers simultaneously.The laser coupling loss is small,the structure is simple,and it is convenient for integration,so it can be widely used in dense wavelength division multiplexing(DWDM) system and optical fiber sensors.展开更多
文摘地质灾害信息,尤其是滑坡灾害的多源性、模糊性、非确定性和随机性,使得信息处理和空间综合分析十分复杂。利用ArcG IS Engine的二次开发接口,结合地质灾害专业数学模型,包括模糊综合评判、多元回归分析、神经网络、信息量法4种模型,使用栅格图层叠加方法,得出滑坡危险性评价图。克服了传统危险性评价成果缺乏直观性和可操作性,导致成果可靠程度的降低。本文主要尝试利用4种模型进行滑坡危险性区域评价,以秭归县某区域为原型,得到评价结果包括低、较低、较高、高4种。因此,建立地质灾害危险性评价的G IS系统是十分必要的。
基金supported by the National Natural Science Foundation of China(Nos.61205068 and 61475133)the Natural Science Foundation of Hebei Province(No.F2015203270)+1 种基金the Science and Technology Program of Hebei Province(Nos.4273301D,13210409 and 15273304D)the College Youth Talent Project of Hebei Province(No.BJ2014057)
文摘In this paper,a new type of multi-wavelength fiber laser is proposed and demonstrated experimentally.Superimposed fiber grating(SIFG) and chirp fiber Bragg grating(CFBG) are used for wavelength selection.Based on gain equalization technology,by finely adjusting the stress device in the cavity,the gain and loss are equal,so as to suppress the modal competition and achieve multi-wavelength lasing at room temperature.The experimental results show that the laser can output stable multi-wavelength lasers simultaneously.The laser coupling loss is small,the structure is simple,and it is convenient for integration,so it can be widely used in dense wavelength division multiplexing(DWDM) system and optical fiber sensors.
