随着天文技术的不断发展,远程观测和自主观测逐渐成为天文观测的主流趋势,自动调焦技术也越来越受到重视。电动调焦器是天文望远镜不可或缺的附属设备,是实现自动调焦的关键设备。为实现云南天文台丽江观测站10英寸米德望远镜的自动调焦...随着天文技术的不断发展,远程观测和自主观测逐渐成为天文观测的主流趋势,自动调焦技术也越来越受到重视。电动调焦器是天文望远镜不可或缺的附属设备,是实现自动调焦的关键设备。为实现云南天文台丽江观测站10英寸米德望远镜的自动调焦,自行研发了一套天文电动调焦器,设计相关控制电路,制定串口通信协议,并编写了一套开源天文公共对象模型(Astronomy Common Object Model,ASCOM)驱动程序SS Focuser,详细介绍了该电动调焦器的结构原理和实现方法,实测结果表明,电动调焦器具有很好的稳定性,完全满足设计要求,为天文电动调焦器设计提供了可借鉴的经验和方法。展开更多
The phylogenetic relationships of Lasiosphaeriaceae are complicated in that the family is paraphyletic and includes Sordariaceae and Chaetomiaceae,as well as several polyphyletic genera.This study focuses on the phylo...The phylogenetic relationships of Lasiosphaeriaceae are complicated in that the family is paraphyletic and includes Sordariaceae and Chaetomiaceae,as well as several polyphyletic genera.This study focuses on the phylogenetic relationships of the coprophilous genera,Anopodium,Apodospora,Arnium,Fimetariella and Zygospermella.They are traditionally circumscribed based on ascospore characters,which have proven homoplasious in other genera within the family.Our results based on LSU nrDNA andß–tubulin sequences distinguish four lineages of Lasiosphaeriaceae taxa.Anopodium joins the clade of mor-phologically similar,yellow-pigmented species of Cercophora and Lasiosphaeria.Apodospora is monophyletic and joins a larger group of taxa with unclear affinities to each other,while Arnium is polyphyletic being scattered throughout three of the four major clades of Lasiosphaeriaceae.Fimitariella is represented by a single collection and joins the clade containing Cercophora scortea and Podospora appendiculata.Zygospermella shows affinities to the Lasiosphaeris clade.Based on a combination of morphological and molecular data,Echria stat.nov.is recognized at the genus level for the former Arnium section and two new combinations are proposed:E.gigantospora and E.macrotheca.展开更多
文摘随着天文技术的不断发展,远程观测和自主观测逐渐成为天文观测的主流趋势,自动调焦技术也越来越受到重视。电动调焦器是天文望远镜不可或缺的附属设备,是实现自动调焦的关键设备。为实现云南天文台丽江观测站10英寸米德望远镜的自动调焦,自行研发了一套天文电动调焦器,设计相关控制电路,制定串口通信协议,并编写了一套开源天文公共对象模型(Astronomy Common Object Model,ASCOM)驱动程序SS Focuser,详细介绍了该电动调焦器的结构原理和实现方法,实测结果表明,电动调焦器具有很好的稳定性,完全满足设计要求,为天文电动调焦器设计提供了可借鉴的经验和方法。
基金financed by the Swedish Taxonomy Initiative(dha 34/071.4)and the Helge Ax:son Johnson foundationsupported in part by a NSF PEET Grant(DEB–9,521,926)to SMH and some sequences were generated in the Pritzker Laboratory for Molecular Systematics and Evolution at The Field Museum of Natural History.
文摘The phylogenetic relationships of Lasiosphaeriaceae are complicated in that the family is paraphyletic and includes Sordariaceae and Chaetomiaceae,as well as several polyphyletic genera.This study focuses on the phylogenetic relationships of the coprophilous genera,Anopodium,Apodospora,Arnium,Fimetariella and Zygospermella.They are traditionally circumscribed based on ascospore characters,which have proven homoplasious in other genera within the family.Our results based on LSU nrDNA andß–tubulin sequences distinguish four lineages of Lasiosphaeriaceae taxa.Anopodium joins the clade of mor-phologically similar,yellow-pigmented species of Cercophora and Lasiosphaeria.Apodospora is monophyletic and joins a larger group of taxa with unclear affinities to each other,while Arnium is polyphyletic being scattered throughout three of the four major clades of Lasiosphaeriaceae.Fimitariella is represented by a single collection and joins the clade containing Cercophora scortea and Podospora appendiculata.Zygospermella shows affinities to the Lasiosphaeris clade.Based on a combination of morphological and molecular data,Echria stat.nov.is recognized at the genus level for the former Arnium section and two new combinations are proposed:E.gigantospora and E.macrotheca.
