《天文学基础》校本课程着重体现对地理信息技术的应用和地理实践力的培养。课程以《诗经》为依托,借助星图软件(星图App、Solar Walk App、Stellarium等)分析某些诗句中蕴含的天文学原理,为学生搭建模拟观星的平台,提供接触现代科技手...《天文学基础》校本课程着重体现对地理信息技术的应用和地理实践力的培养。课程以《诗经》为依托,借助星图软件(星图App、Solar Walk App、Stellarium等)分析某些诗句中蕴含的天文学原理,为学生搭建模拟观星的平台,提供接触现代科技手段、了解优秀传统文化的机会,达到增强学习兴趣、提高地理实践能力、满足学生的多元化需求的目标。展开更多
A 10-pole quasi-elliptic bandpass filter （BPF） with a relatively wide passband in the very high frequency （VHF） band was de- signed and fabricated using YBCO thin films deposited on both sides of a LaAIO3 substrat...A 10-pole quasi-elliptic bandpass filter （BPF） with a relatively wide passband in the very high frequency （VHF） band was de- signed and fabricated using YBCO thin films deposited on both sides of a LaAIO3 substrate. Single-spiral resonators were modified to generate strong coupling and reduce the parasitic coupling, We analysed the coupling polarities between the modi- fied resonators. Two pairs of attenuation poles were introduced in the filter for sharp cut-off response. The measurements showed that the filter has a centre frequency of 255.8 MHz, fractional bandwidth of about 12.3%, insertion loss of smaller than 0.265 dB, and the return loss in the passband of better than 17.5 dB, in zood a^reement with computer simulations.展开更多
文摘《天文学基础》校本课程着重体现对地理信息技术的应用和地理实践力的培养。课程以《诗经》为依托,借助星图软件(星图App、Solar Walk App、Stellarium等)分析某些诗句中蕴含的天文学原理,为学生搭建模拟观星的平台,提供接触现代科技手段、了解优秀传统文化的机会,达到增强学习兴趣、提高地理实践能力、满足学生的多元化需求的目标。
基金supported by the External Cooperation Program of theChinese Academy of Sciences (Grant No. GJHZ1007)the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No.KJCX2-YW-W16)
文摘A 10-pole quasi-elliptic bandpass filter （BPF） with a relatively wide passband in the very high frequency （VHF） band was de- signed and fabricated using YBCO thin films deposited on both sides of a LaAIO3 substrate. Single-spiral resonators were modified to generate strong coupling and reduce the parasitic coupling, We analysed the coupling polarities between the modi- fied resonators. Two pairs of attenuation poles were introduced in the filter for sharp cut-off response. The measurements showed that the filter has a centre frequency of 255.8 MHz, fractional bandwidth of about 12.3%, insertion loss of smaller than 0.265 dB, and the return loss in the passband of better than 17.5 dB, in zood a^reement with computer simulations.
