Bu’s gold deposit is geographically situated in the northern side of Sawuer Mt., Western Jungar. Magmatites in Bu’s deposit including extrusive and intrusive rocks are widespread and have genetic relationship with t...Bu’s gold deposit is geographically situated in the northern side of Sawuer Mt., Western Jungar. Magmatites in Bu’s deposit including extrusive and intrusive rocks are widespread and have genetic relationship with the deposit. One volcanic suite and two intrusives are studied here. Extrusive products were formed in the Early Carboniferous with a whole-rock Rb-Sr isochron age of 347 Ma and fossil ages, while intrusions have Rb-Sr isochron ages from 310 to 329 Ma and are intrusive into the Lower Carboniferous and Upper Devonian.The isotope parameters I ranges from 0. 7037 to 0. 7046, from -5. 65^+6.67 and more,goes from +5. 65~ +7. 96, displaying that they have similar material sources and are derived from mantle magmas or their derivatives. The continental crust of Zhaisang diwa region may be initially formed in the Late-Proterozoic or even more earlier and grew probably in terms of non-proportionated model like S. China, N. American and other parts in the world.展开更多
为了减小能耗,提高效率,实现电路贴片化,同时又能获得比较理想的音质,提出了一种D类功率放大器设计方案。以STA335BW为主芯片,配以优质的二阶低通滤波器,就能构成高性能的D类功率放大器。实践表明,此功率放大器的输出功率可达2×16...为了减小能耗,提高效率,实现电路贴片化,同时又能获得比较理想的音质,提出了一种D类功率放大器设计方案。以STA335BW为主芯片,配以优质的二阶低通滤波器,就能构成高性能的D类功率放大器。实践表明,此功率放大器的输出功率可达2×16 W,总谐波失真度(THD)在1%以下,电路效率可达90%,频响范围可达20 Hz^20 k Hz。该放大器可用于数字声像设备中,具有广阔的应用前景。展开更多
随着采集技术的更新,生态水文数据采集系统不断向网络化、微型化和智能化的方向发展。近年来,在水文监测领域的推广下,SDI-12总线(Serial Digital Interface with 1200 band)作为一种新型串行数据通讯接口协议,是为采集环境数据的传感...随着采集技术的更新,生态水文数据采集系统不断向网络化、微型化和智能化的方向发展。近年来,在水文监测领域的推广下,SDI-12总线(Serial Digital Interface with 1200 band)作为一种新型串行数据通讯接口协议,是为采集环境数据的传感器所设计的标准总线。它在对比了传统监测手段与现代化自动监测手段的基础上,设计了一种基于SDI-12总线的地下水监测系统,将传感器技术、数据通信技术和计算机技术相结合,完成了实验室的初步设计,实现对水位、水温及p H值等参数的实时采集、无线传输以及远程管理。展开更多
文摘Bu’s gold deposit is geographically situated in the northern side of Sawuer Mt., Western Jungar. Magmatites in Bu’s deposit including extrusive and intrusive rocks are widespread and have genetic relationship with the deposit. One volcanic suite and two intrusives are studied here. Extrusive products were formed in the Early Carboniferous with a whole-rock Rb-Sr isochron age of 347 Ma and fossil ages, while intrusions have Rb-Sr isochron ages from 310 to 329 Ma and are intrusive into the Lower Carboniferous and Upper Devonian.The isotope parameters I ranges from 0. 7037 to 0. 7046, from -5. 65^+6.67 and more,goes from +5. 65~ +7. 96, displaying that they have similar material sources and are derived from mantle magmas or their derivatives. The continental crust of Zhaisang diwa region may be initially formed in the Late-Proterozoic or even more earlier and grew probably in terms of non-proportionated model like S. China, N. American and other parts in the world.
文摘为了减小能耗,提高效率,实现电路贴片化,同时又能获得比较理想的音质,提出了一种D类功率放大器设计方案。以STA335BW为主芯片,配以优质的二阶低通滤波器,就能构成高性能的D类功率放大器。实践表明,此功率放大器的输出功率可达2×16 W,总谐波失真度(THD)在1%以下,电路效率可达90%,频响范围可达20 Hz^20 k Hz。该放大器可用于数字声像设备中,具有广阔的应用前景。
文摘随着采集技术的更新,生态水文数据采集系统不断向网络化、微型化和智能化的方向发展。近年来,在水文监测领域的推广下,SDI-12总线(Serial Digital Interface with 1200 band)作为一种新型串行数据通讯接口协议,是为采集环境数据的传感器所设计的标准总线。它在对比了传统监测手段与现代化自动监测手段的基础上,设计了一种基于SDI-12总线的地下水监测系统,将传感器技术、数据通信技术和计算机技术相结合,完成了实验室的初步设计,实现对水位、水温及p H值等参数的实时采集、无线传输以及远程管理。
