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中国淡水硅藻新记录——偏肿内丝藻兴凯变种 被引量:5
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作者 王婷 鲍明艳 +4 位作者 卢剑轲 王先云 王振方 张瑞雷 张玮 《西北植物学报》 CAS CSCD 北大核心 2019年第10期1884-1891,共8页
于2016年5月对浙江省仙居国家公园进行藻类多样性调查时,发现了中国淡水硅藻的1个新记录种--偏肿内丝藻兴凯变种[Encyonema ventricosum var.hankensis(Skvortzov) Rodionova&Pomazkina]。该文采用光镜和扫描电镜对偏肿内丝藻兴凯... 于2016年5月对浙江省仙居国家公园进行藻类多样性调查时,发现了中国淡水硅藻的1个新记录种--偏肿内丝藻兴凯变种[Encyonema ventricosum var.hankensis(Skvortzov) Rodionova&Pomazkina]。该文采用光镜和扫描电镜对偏肿内丝藻兴凯变种浙江种群的形态特征进行了观察和描述,并将其与该种的其他地理种群及内丝藻属其他相似物种的形态特征进行比较,同时讨论了该物种的生境特征。结果表明:(1)偏肿内丝藻兴凯变种壳面均具明显背腹之分,背缘明显拱起,腹缘轻微波曲;端部呈头状至喙状。(2)偏肿内丝藻兴凯变种浙江地理种群在背部中央区域具一孤点,而其兴凯种群对孤点这一特征未有描述。(3)偏肿内丝藻兴凯变种在俄罗斯的兴凯湖和贝加尔湖等地有分布,该种在中国是首次报道。 展开更多
关键词 内丝藻 新记录种 偏肿内丝藻兴凯变种 仙居国家公园 淡水硅藻
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On Cyclically Symmetric Crack Problems 被引量:1
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作者 lu jianke 《Wuhan University Journal of Natural Sciences》 CAS 1997年第2期6-12,共7页
The first fundamental problems in the infinite plane with cracks and boundary values cyclically symmetric are considered. They are reduced to singular integral equations on a single crack, which would considerably sim... The first fundamental problems in the infinite plane with cracks and boundary values cyclically symmetric are considered. They are reduced to singular integral equations on a single crack, which would considerably simplify the process of method of solution for such problems. Some special cases are illustrated. 展开更多
关键词 basic region of cyclic symmetry cyclic constant Kolosov functions plane crack problems singular integral equations
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On Convergence of Singular integral Operators With Respect to Path of Integration
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作者 Wang Xiaolin lu jianke 《Wuhan University Journal of Natural Sciences》 CAS 1996年第2期144-148,共5页
Given f being Holder continuous in a region GC. For the Cauchy principal integral where G is a smooth closed contour,lt is established that,if a sequence or smooth closed contours G(n ∈N ) smoothly convergent top,the... Given f being Holder continuous in a region GC. For the Cauchy principal integral where G is a smooth closed contour,lt is established that,if a sequence or smooth closed contours G(n ∈N ) smoothly convergent top,then the corresponding sequence I(Γm,f)is convergent to I (,f). Furthermore,when Γ is approximated by a sequence of complex cubic splines(Γ)interpolatory to Γ,the error is estimated. 展开更多
关键词 singular integral operator smooth convergence complex interpolatory spline
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