甘肃省耳叶苔科植物研究小记

回顾了甘肃省耳叶苔科苔类植物的研究历史。通过文献整理和标本鉴定,得出甘肃省耳叶苔科植物15个分类单位:细茎耳叶苔(F.bolanderi)、西南耳叶苔(Frullania consociate)、达乌里耳叶苔(Frullania davurica)、达乌里耳叶苔芽胞变型(F.davuricaf.dorsoblastos)、达乌里耳叶苔凹叶亚种(Frullania davuricasubsp.jackii)、达乌里耳叶苔小叶变型(F.davuricaf.microphylla)、皱叶耳叶苔(F.ericoides)、斜基耳叶苔(F.handel-mazzettii)、盔瓣耳叶苔(Frullania muscicola)、粗萼耳叶苔(F.rhystocolea)、陕西耳叶苔(Frullania schensiana)、中华耳叶苔(F.sinensis)、塔拉大克耳叶苔(F.taradakensis)、欧耳叶苔(Frullania tamarisci)、欧耳叶苔岷山变型(F.tamariscif.minshanensis),其中达乌里耳叶苔(Frullania davurica),达乌里耳叶苔凹叶亚种(F.davuricasubsp.jackii),欧耳叶苔(F.tamarisci)为甘肃省首次报道。将列胞耳叶苔(Frullania moniliata)移除甘肃省苔藓植物区系,编写了甘肃省耳叶苔属植物分种检索表,并对其分布特点作了初步分析。     

迈克尔孙干涉仪中的光程差释疑

本文对迈克尔孙干涉仪等倾干涉时的两条光路进行了深刻的剖析,在光线以任意角度入射盼隋况下,用光路镜像法和直接计算法得到了两光路的光程差公式。     

“里耳”:晚明市民文学的读者定位

晚明市民文学作者将平民读者(即本文之“里耳”)视作主体读者群,以其理解力为作品通俗的标准,对市民文学创作意义深远。这一思想的哲学基础,乃是明代心学的平民性。     

Asian origin for Polystichum （Dryopteridaceae） based on rbcL sequences

Chloroplast rbcL sequences of 60 species of Polystichum sensu lato (s.l.), including 23 new sequences from southwest China, were used to assess the phylogenetic relationships within the genus. On the basis of estimated evolution rate of rbcL gene and the genetic distance data that passed relative-rate tests, we further estimated the divergence times between some clades of the genus. The phylogenetic relationships were inferred using the neighbor-joining and maximum-parsimony methods, both methods producing trees with completely congruent topology. These trees reveal that all species of Polystichum s.l. in this study (including Cyrtomium and Cyrtomidictyum) form a monophyletic group. The basal split in Polystichum s.l. separates a clade with all Asian members from a clade containing other species from all over the world. The phylogenetic and divergence time estimation results lead us to suggest that Polystichum s.l. originated in Asia in the late Late Cretacous (≈76 Ma) and migrated into other places in the world in early Eocene(≈46 Ma).     

菲涅耳圆孔衍射的轴上光强分布

本文从惠更斯－菲涅耳原理出发，在球面波入射的情况下，导出了菲涅耳圆孔衍射的轴上光强分布的解析表达式，并对轴上光强分布进行了定量的分析讨论。     

热释电红外线自动开关的设计

介绍了热释电红外线自动开关的设计步骤及各部分的作用，并给出了实用的电路。该开关接上执行机构就可以直接构成实用系统。