苦苣苔亚科的地理分布   总被引：5，自引：0，他引：5  

李振宇 《中国科学院研究生院学报》1996,34(4):341-360

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中国车前属植物一新记录     

李振宇  张永田  依布拉音·艾尔西丁 《中国科学院研究生院学报》2002,40(5):470-472

首次报道圆苞车前Plantago ovata Forsk．在中国的归化新记录，并提供该种的详细描述。  相似文献   

重视医学生心理健康教育的思考     

李振宇  王海涛 《华章》2011,(15)

心理素质是当代医学生综合素质的重要组成部分,重视心理健康教育是新形势下做好医学生思想政治教育工作的重要内容,医学高等教育不仅要重视对医学生文化素质、身体素质的培养,还要重视心理素质的培养.重视医学生心理健康教育,对加强医学院校思想政治工作,为国家培养合格的高素质医学人才具有十分重要的意义.  相似文献   

半蒴苣苔属的研究(续)   总被引：1，自引：0，他引：1  

李振宇 《中国科学院研究生院学报》1987,25(3):220-230

The genus Hemiboea is a curious genus of the tribe Didymocarpeae (Cyrtandroi- deae), characterized by its peculiar pistil with one fertile carpel and its follicle-like capsule. This genus has not yet been thoroughly studied since its establishment by C. B. Clarke in 1888.  In the present paper, the taxonomic history is briefly reviewed; the external morphology, leaf his- tology, pollen morphology and geographical distribution are discussed; a key to the 21 species recognized by the author is provided; and the economic uses reported in various publications are summarized.       I.  Morphology       (1)  Sclereids  The foliar sclereids, occurring in this genus and defined by their forms, fall into two types.       (A) Vermiform selereids  This type of sclereids is noted in 15 species and may be clas- sified into two groups according to their positions in leaf tissues.  Those of the first group are interspersed in the ground tissue around the vascular bundles of leaves and noted in 12 species, i.e.H. longisepala, H. cavaleriei, H. bicornuta, H. fangii, H. omeiensis, H. gracilis, H. glandulosa, H. mollifolia, H. pingbianensis, H. parviflora, H. strigosa and H. gamosepala, and those of the second group are dispersed in the mesophyll, occurring in H. subcapitata, H. henryi and H. latisepala.       (B) Astrosclereids The sclereids of this type are discovered for the first time in Hemiboea, dispersed in the mesophyll of a single species, i.e.H. lungzhouensis.      No foliar sclereids are found in the remaining 5 species, i.e.H. integra, H. flaccida, H. longgangensis, H. subacaulis and H. follicularis.      The differences in forms and positions of the foliar sclereids and their absence or pre- sence are of great help in understanding the relationship between the infrageneric taxa.    (2)  Pollen grains  The pollen grains of 19 species were examined with LM and SEM. They are 3-colporate, subglobose or prolate, 20-38.8×22-28μm.  The exine  is  1.3-2μm thick and the sculpture is foveolate (e.g.H. cavaleriei) to reticulate (e.g.H. omeiensis).  In Sect. Subcapitatae the pollen grains are subglobose or prolate, while those of Sect. Hemiboea are prolate.       No pollen grains are observed in anthers of 13 speciemens of H. subacaulis var. subacaulis and var. jiangxiensis.        (3)  Seed-coat Under SEM the seed-coat exhibits considerable diversity in the genus, fur- nishing useful characters for explaining the relationship between the two sections.       2.  Geographical distribution  The genus Hemiboea ranges from the eastern border of the Xizang Plateau and Yunnan Plateau eastwards to Ryu Kyu Islands, and from the southern slope of the Qinling Range southwards to northern Vietnam.  The karst region of S. E. Yun- nan and W. Guangxi is the centre of maximum variation of the genus and is probably its origin centre, where the most primitive taxon exists, and where more species (13 species, i.e. 61.9 per cent of the sum total) and more endemic species (8 species) are found than elsewhere.       3.  Classification  The genus consists of 21 species and 6 varieties which are classified into 2 sections.  The Clarke's classification is accepted, but emended here as follows:       Sect. 1. Subcapitatae Clarke Sepals free or posterior ones connate.  Muri of the seed-coat laevigate or rugose; bottom of meshes flat, smooth or with few verrucae.  Pollen grains subglo- bose or prolate.       Sect. 2. Hemiboea Sepals connate.  Muri of the seed-coat tuberculate or aliform-tuberculate; bottom of meshes flat or concave, with dense verrucae.   Pollen grains prolate.       Based on the analysis of external and internal morphological characters, the main evolu- tionary trends in the genus are discussed and enumerated, and a hypothesis indicating the re- lationships between the two sections is given.  相似文献   

大学生政治信仰的形成机制及教育体系构建研究     

李振宇 《出国与就业》2011,(2)

鉴于社会转型期的大学生政治信仰教育面临着很多问题与挑战,本文对大学生政治信仰与研究现状进行了综述,系统地分析了其形成机制,并结合国际(内)局势、高等教育理论与大学生思想政治教育现状,构建了政治信仰教育体系,为解决转型期所出现的大学生政治信仰问题提供对策参考。  相似文献   

半蒴苣苔属的研究   总被引：3，自引：0，他引：3  

李振宇 《中国科学院研究生院学报》1987,25(2):81-92

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关于当前我国动画教育模式的思考   总被引：2，自引：0，他引：2  

李振宇 《内江科技》2009,30(7):26-27

如何最大限度地运用我们现有的动画教学资源,加强我国动画中高级人才的培养,以满足动画人才的市场需求,推动我国动画产业的发展,是我们动画教育事业和动画产业共同面临的一项重大课题。本文对此进行了一些分析和思考。  相似文献   

基于多传感器数据融合技术的烧结矿碱度预报模型的研究     

李振宇 《安阳工学院学报》2006,(1):33-36

烧结矿碱度的测量是钢铁工业中的关键和难点,况且又容易受到烧结几乎每一个操作环节的影响。利用BP神经网络进行多传感器数据融合的烧结矿碱度的预报模型,可对现场实际数据进行仿真,该方法准确性高,泛化能力广,具有很强的实用性和推广价值。  相似文献   

位置     

李振宇 《军事记者》1999,(4)

没有辉煌的光没有明媚的脸我的位置很平凡我——是一名报道员白天我的足迹在乡间的小路寻觅在绿色的军营扎根在火热的工地穿梭我找到了我的位置在人民中间夜晚寂寞为友汗水为伴笔端淌出心泉墨迹耕出心田我找到了我的位置在方寸之间位置@李振宇  相似文献   

另一种收获     

李振宇 《军事记者》1999,(7)

做为一名报道员,由工作性质,决定了要同形形色色的人打交道。在艰辛的工作中,我常常于不经意间得到另一种收获,那是世间最美的瑰宝,它来自生活在最底层一颗颗纯朴的心灵,那就是高尚的人格力量,它指引我感受纯真,鞭策我做一个正直的人。一次,我去采访过一位百岁拥军老人──赵德武,恰巧当时武装部正在进行利益观教育,从老人身上我找到了最生动的教材。老人出生于１９０５年,７岁就在矿井做苦工,口叼一盏煤油灯,用绳子拖着小煤筐在狭窄的矿坑爬着拉煤,毫不夸张地说,他是用膝盖养活了一家老小,以至晚年双腿落下了残疾。１９４…  相似文献