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1.
本文详细的讨述了不同媒体的检索刊物性能及发展模式,探讨了订购不同媒体检索刊物选择方式。 相似文献
2.
对国内检索刊物在检索功能方面存在的缺陷进行了剖析,认为图书馆完善检索刊物检索功能的关键是强化索引工作,并提出了几种具体做法。 相似文献
3.
我国文献检索刊物的数据库化研究 总被引：1，自引：0，他引：1
本文借鉴国外检索刊物数据库的经验及启示,分析了我国检索刊物及其数据库化的现状,并从我国检索刊物数据库化的整个技术处理环节,详细论述了应采取的技术措施,最后指出了我国文献数据库的发展策略。 相似文献
4.
现实数据库中的相关信息总是表现为不同的媒体形态，传统的多媒体信息检索只是集中于单一媒体类型的检索以及关键词匹配方式的检索，为用户充分收集相关信息造成了很大的不便。本文以三国历史知识检索为例，探讨了一种基于OWL本体的多媒体信息描述方法与融合检索方法，使得一次检索并获取多种媒体类型信息，并且这些信息是通过本体推理得出。 相似文献
5.
介绍了利用多媒体各媒体特征及各媒体之间相关性检索的全景检索模型和基于全景检索模型的多媒体检索系统。阐述了用于Web检索的多媒体检索系统的构成及功能。 相似文献
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7.
本文回顾了35年来我国科技文献检索刊物体系的发展过程,总结了我国科技文献检索刊物的现状和特点,指出目前检索刊物发展中存在的主要问题。文章还对我国科技文献检索刊物发展的制约因素进行了分析、研究,并展望其发展前景。 相似文献
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9.
美国《数学评论》是世界上数学科学著名的检索刊物。本文就它的编排和检索方法作了详尽的阐述。可为数学工作者使用它时参考。 相似文献
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11.
在为编写《Flora of China》伞形科而进行的修订工作中，提出了11个新组合，即矮小丝瓣芹Acronema minus (M. F. Watson) M. F. Watson & Z. H. Pan, 短柄丝瓣芹A. brevipedicellatum Z. H. Pan & M. F. Watson, 川西当归Angelica sinensis var. wilsonii (H. Wolff) Z. H. Pan & M. F. Watson, 云南细裂芹Harrysmithia franchetii (M. Hiroe) M. L. Sheh, 钝叶独活Heracleum candicans var. obtusifolium (Wall. ex DC.) F. T. Pu & M. F. Watson, 中华天胡荽Hydrocotyle hookeri ssp. chinensis (Dunn ex R. H. Shan & S. L. Liou) M. F. Watson & M. L. Sheh, 普渡天胡荽H. hookeri ssp. handelii (H. Wolff) M. F. Watson & M. L. Sheh, 锐棱岩风Libanotis grubovii (V. M. Vinogradova) M. L. Sheh & M. F. Watson, 美脉藁本Ligusticum likiangense (H. Wolff) F. T. Pu & M. F. Watson和线叶藁本L. nematophyllum (Pimenov & Kljuykov) F. T. Pu & M. F. Watson, 无管藁本L. nullivittatum (K. T. Fu) F. T. Pu & M. F. Watson和二色棱子芹Pleurospermum bicolor (Franch.) C. Norman ex Z. H. Pan & M. F. Watson.; 发现了1个新种，即短柄丝瓣芹。此外，还为Pleurospermum govanianum var. bicolor Franch.指定了后选模式。 相似文献
12.
本文提出了龙胆属两个种的新名称(Gentiana membranulifera T．N．Ho,G．nudicaulisKurz var. assa-
mensis T．N．Ho)和5个变种的新组合[(Gentiana lateriflora Hemsl．var. uncifolia(H．J．Lam)T．N．Ho,
G．sumatrana Ridl．var．humifusa(S．Moore)T．N．Ho,G. quadrifaria Bl．var．wightii(Kusnez．)T．N．Ho,
G．loerzingii Ridl. var．timida(Kerr)T．N．Ho,G．membranulifera T．N．Ho var．recurvata (Kusnez．)T．N．Ho)〕。 相似文献
13.
卢生莲 《中国科学院研究生院学报》1992,30(6):529-540
Some new taxa of the genus Festuca (Gramineae) are described
from China. They are Sect. Longiglumes S.L. Lu,Sect. Muticae S.L. Lu, Sect.
Sinensis S.L. Lu, Sect, Nitidulae S.L. Lu, and Festuca pubiglumis S.L. Lu, F.
longiglumis S. L. Lu, F.fascinata Keng, F. mutica S.L. Lu, F. sinensis Keng, F.
subalpina Chang et Skvort. ex S.L. Lu, F. chelungkingnica Chang et Skvort. exS.L. Lu. In addition, one new name F. taiwanensis S.L. Lu is included. 相似文献
14.
马炜梁 《中国科学院研究生院学报》1991,29(4):289-314
本文报道了谷精草属3个新系，7个新种、5个新变种、2个新组合、3个新记录、修正了5个种的特征记载，新归并学名15个，共涉及全国32种8变种中的34个。 相似文献
15.
横断山区马先蒿属新分类群 总被引：1，自引：0，他引：1
杨汉碧 《中国科学院研究生院学报》1990,28(2):136-144
Six new species, 1 new subspecies and 1 new variety are described in
this paper. They are P. salviiflora Franch. ex Forbes et Hemsl. var. leiocarpa
H. P. Yang (Ser. Salviiflorae Prain), P. rex C. B. Clarke subsp. zayuensis H. P.
Yang (Ser. Reges Li), P. xiangchengensis H. P. Yang (Ser. Cyathophyllae Li), P.
deqinensis H. P. Yang (Ser. Myriophyllae Maxim.), P. weixiensis H. P. Yang(Ser.
pectinatiformes Tsoong), P. rizhaoensis H. P. Yang (Ser. Lyratae Maxim.), P.
gongshanensis H. P. Yang (Ser. Cernuae Li), P. dulongensis H. P. Yang (Ser.
Wilsoniae Li). 相似文献
16.
本文报道了产自湖南省的轮藻1新种、4新变种、 5个亚洲新记录和8个中国新
记录：四盾轮藻Chara quadriscutula sp．nov., 布氏轮藻柱孢变种 C．braunii Gmelin var．
cylindrospora，var．nov., 松形轮藻湖南变种 C．hydropitys var．hunanensis，var．nov., 腋球丽
藻二型变种 Nitella axilliformis Imahori var．biformis var． nov．, 小果丽藻单果变种N．
microcarpa Braun var．unicarpa，var．nov．以及小果丽藻N．microcarpa Braun，细枝丽藻 N．
leptoclada Braun，安氏丽藻N．annandalei Pal，疏丝丽藻N.confervacea A Braun, 细形丽
藻N．gracilliformis J. Groves，倒置丽藻N．inversa Imahori，武藏丽藻N.musashiensis Mo-
rioka，稀脊丽藻N．paucicostata T. F. Allen，尖头丽藻戈尔梅变种 N． acuminata var．
gollmeriana(A．Br．)Zanev．＆ R．D. Wood，博尔德鸟巢藻Tolypella boldii Sawa，长枝轮
藻Chara longifolia Robinson，匹斯汀轮藻C．pistianensis J．Vilhelm 和格氏轮藻 C.grovesiiPal。 相似文献
17.
The present paper, mainly dealing with phytogeographical, Cytological and Palynolo
gical studies on Chinese Stachyuraceae, is the first part of a series of contributions to systematics of this family. As we know, Stachyuraceae, a monogeneric family, is endemic to
East Asia, with a strong differentiation in China. Systematic position of the family is still uncertain. Undoubtedly, multidisciplinary studies on it wisl give a better understanding of plant differentiation in East-Asiatic floristic region and systematic position of the family.
The distribution of all the 9 Chinese species of Stachyurus have been studied on the basis of morphogeographical method. The status of some taxa has been changed as follows: Stachyurus chinensis Franch. ssp. latus (Li) Y. C. Tang et Y. L. Cao, stat. nov. S. chinen-sis Franch. Ssp. cuspidatus (Li) Y. C. Tang et Y. L. Cao, stat. nov. S. chinensis Franch. ssp. brachystachyus (C. Y. Wu et S. K. Chen) Y. C. Tang et Y. L. Cao, stat. nov. S. salicifolius Franch. ssp. lancifolius (C. Y. Wu) Y. C. Tang et Y. L. Cao, stat. nov., S. yunnanensis Franch. var. pedicellatus Rehd. and S. oblongifolius Wang et Tang being reduced as synonyms of S. yunnanensis Franch. From morphological point of view, we would consider that sect. Callosurus is more primitive and its present area might be the preservation center of the family.
In this paper the chromosome numbers of 5 taxa, i.e. Stachyurus yunnanensis, S. chinensis ssp. chinensis, S. chinensis ssp. cuspidatus, S. salicifolius ssp. salicifolius, S. retusus, are reported for the first time. Along with the chromosome countings of S. himalaicus and S. sigeyosii by S. kurosawa, we come to the conclusion that all the species so far studied have 24 small somatic chromosomes (2n=24).
The pollen grains of 6 taxa, i.e. Stachyurus yunnanensis, S. obovatus, S. himalaicus, S. chinensis ssp. chinensis, S. salicifolius ssp. salicifolius, S. retusus were also examined. Together with the observations of G. Erdman and Huang Tsengchien on S. himalaicus, it seems that the pollen grains of the genus Stachyurus are rather uniform in morphology. The pollen grains of sect. Callosurus are tricolporoidate, while those of sect. Stachyurusare tricolporate. Two pollen types, representeb by the two sections, though not strongly distinct, may be considered as further evidence of the validity of the two taxa as section.
Sexuality of flowers is also disscussed in the paper. According to our observationon six species, i.e. Stachyurus yunnanensis, S. obovatus, S. himalaicus, S. chinensis, S. salicifolius, S. retusus, the plants are dioecious, which supports T. Makino's observation on S. praecox and H. Hara's on S. himalaicus. Female flowers have relatively large pistils and short stamens with empty anthers, while male flowers have smaller sterile pistils and longer stamens with well developed anthers. 相似文献
18.
梁松筠 《中国科学院研究生院学报》1990,28(2):153-158
In addition, two new sections, Echinochlomorphae Y. L. Chang and
Thomsonianae Y. L. Chang, two new combinations, C. duriuscula subsp. rigescens
(Franch.) S. Y. Liang et Y. C. Tang (=C. stenophylla var. rigescens Franch.) and
C. rochebrunii Franch. Subsp. reptans (Franch.) S. Y. Liang et Y. C. Tang (=C.
remotae L. var. reptans Franch.) are made, and C. stenophylloides V. Krecz. is
reduced to C. duriuscula subsp. stenophylloides (V. Krecz.) S. Y. Liang et Y. C.Tang. 相似文献
19.
20.
潘开玉 《中国科学院研究生院学报》1988,26(6):429-442
Ten new species, three new varieties and a new section of the family Ge-
sneriaceae are described from China in the present paper. They are Tremacron urceolatum
K. Y. Pan from Muli of SW Sichuan, T. obliquifolium K. Y. Pan from Miyi and Yanyuan
of SW Sichuan, T. aurantiacum K. Y. Pan from Mabian and Pinshan of S Sichuan, lsometrum
Sect. Chorianthera W. T. Wang et K. Y. Pan (with I. eximium Chun as the section type),
Isometrum eximium Chun ex K. Y. Pan from Jiulong, Muli and Jinyang of SW Sichuan;
Ancylostemon mairei (Levl.) Craib var. emeiensis K. Y. Pan from Mt. Emei of Sichuan, A.
aureus (Franch.) Burtt var. angustifolius K. Y. Pan from Zhenkang of SW Yunnan, A. ga-
mosepalus K. Y. Pan from Hanyuan, Yanyuan and Yuexi of SW Sichuan, A. rhombifolius K.
Y. Pan from Meigu of SW Sichuan, A. ronganensis K. Y. Pan from Rong an of Guangxi;
Corallodiscus flabellatus) (Craib) Burtt var. puberulus K.Y. Pan from Zhongdian and Deqin
of NW Yunnan, Nanchuan of S Sichuan and Zayü of Xizang (Tibet), Beccarinda minima
K. Y. Pan from Jinxiu and Xiangzhou of Guangxi, Boeica stolonifera K. Y. Pan from Fang-
cheng, Shiwandashan, Pingnan and Dongxing of S Guangxi, B. multinervia K. Y. Pan from
Yingjiang of W Yunnan, and Paraboea barbatipes K. Y. Pan from Napo of W Guangxi and
Xichou of SE Yunnan. 相似文献