光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具...光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具体案例分析该技术在广播中的实际应用,展示其在提升音质、降低成本和增强系统可靠性方面的显著效益。结果表明,光纤共享模式显著优化了音频处理流程,降低了维护成本,提高了广播系统的整体效率和稳定性。展开更多
Multiple cropping index （MCI） is the ratio of total sown area and cropland area in a region, which represents the regional time intensity of planting crops. Multiple cropping systems have effectively improved the ut...Multiple cropping index （MCI） is the ratio of total sown area and cropland area in a region, which represents the regional time intensity of planting crops. Multiple cropping systems have effectively improved the utilization efficiency and production of cropland by increasing cropping frequency in one year. Meanwhile, it has also significantly altered biogeochemical cycles. Therefore, exploring the spatio-temporal dynamics of multiple cropping intensity is of great significance for ensuring food and ecological security. In this study, MCI of Huang-Huai-Hai agricultural region with intensive cropping practices was extracted based on a cropping intensity mapping algorithm using MODIS Enhanced Vegetation Index （EVI） time series at 500-m spatial resolution and 8-day time intervals. Then the physical characteristics and landscape pattern of MCI trends were analyzed from 2000-2012. Results showed that MCI in Huang-Huai-Hai agricultural region has increased from 152% to 156% in the 12 years. Topography is a primary factor in determining more stable in hilly area than in plain area. An the spatial pattern dynamics of MCI, which is increase from 158% to 164% of MCI occurred irplain area while there was almost no change in hilly area with single cropping. The most active region of MCI change was the intersection zone between the hilly area and plain area. In spatial patterns, landscape of multiple cropping systems tended to be homogenized reflected by a reduction in the degree of fragmentation and an increase in the degree of concentration of cropland with the same cropping system.展开更多
文摘光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具体案例分析该技术在广播中的实际应用,展示其在提升音质、降低成本和增强系统可靠性方面的显著效益。结果表明,光纤共享模式显著优化了音频处理流程,降低了维护成本,提高了广播系统的整体效率和稳定性。
基金National Natural Science Foundation of China,No.41430861,No.41471453Strategic Priority Research Program,the Chinese Academy of Sciences(CAS),No.XDA20010202
文摘Multiple cropping index （MCI） is the ratio of total sown area and cropland area in a region, which represents the regional time intensity of planting crops. Multiple cropping systems have effectively improved the utilization efficiency and production of cropland by increasing cropping frequency in one year. Meanwhile, it has also significantly altered biogeochemical cycles. Therefore, exploring the spatio-temporal dynamics of multiple cropping intensity is of great significance for ensuring food and ecological security. In this study, MCI of Huang-Huai-Hai agricultural region with intensive cropping practices was extracted based on a cropping intensity mapping algorithm using MODIS Enhanced Vegetation Index （EVI） time series at 500-m spatial resolution and 8-day time intervals. Then the physical characteristics and landscape pattern of MCI trends were analyzed from 2000-2012. Results showed that MCI in Huang-Huai-Hai agricultural region has increased from 152% to 156% in the 12 years. Topography is a primary factor in determining more stable in hilly area than in plain area. An the spatial pattern dynamics of MCI, which is increase from 158% to 164% of MCI occurred irplain area while there was almost no change in hilly area with single cropping. The most active region of MCI change was the intersection zone between the hilly area and plain area. In spatial patterns, landscape of multiple cropping systems tended to be homogenized reflected by a reduction in the degree of fragmentation and an increase in the degree of concentration of cropland with the same cropping system.
