全文获取类型
收费全文 | 183篇 |
免费 | 0篇 |
专业分类
系统科学 | 24篇 |
理论与方法论 | 1篇 |
现状及发展 | 36篇 |
研究方法 | 12篇 |
综合类 | 107篇 |
自然研究 | 3篇 |
出版年
2019年 | 1篇 |
2018年 | 1篇 |
2016年 | 2篇 |
2013年 | 5篇 |
2012年 | 7篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2008年 | 6篇 |
2007年 | 10篇 |
2006年 | 12篇 |
2005年 | 15篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 3篇 |
1974年 | 6篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1970年 | 3篇 |
1969年 | 5篇 |
1968年 | 3篇 |
1967年 | 3篇 |
1966年 | 6篇 |
1963年 | 1篇 |
排序方式: 共有183条查询结果,搜索用时 15 毫秒
1.
How People Use Rich Pictures to Help Them Think and Act 总被引:1,自引:1,他引:0
Groups of all kinds are complex organisations. To understand them and to facilitate them in process terms is a matter of rich and diverse discourse in varied fields from sustainable development to coastal ecology; from bandwidth in rural communities to health service provision. How to allow groups to discourse, problem solve and review their own issues and concerns? Diagrams in general and rich pictures in particular can be great means to allow groups to explore their subconscious, their occult sentiments and conflicted understandings. This paper explores and explains diverse use of pictures and shows how they can be applied and understood in group processes of all kinds. 相似文献
2.
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Construction of a 10-MWe solar thermal power plant in Daggett, California, involved clearing and leveling 53 ha of desert land. Transient offsite effects of this construction were apparent as a reduced density of annual plants within 100 m downwind of the edge of the cleared area. Schismus arabicus populations recovered within four years, but Erodium cicutarium populations did not. The effects appeared to be related more to an interaction of seed-dispersal mechanisms with the large, open space than to the obvious sand movement and deposition associated with the clearing operations. 相似文献
3.
M A Bell 《Experientia》1969,25(8):837-841
4.
5.
中文文本压缩的LZW算法 总被引:8,自引:0,他引:8
本文报告两个关于中文信息处理研究的结果:(1)采用Cover的方法,猜估中文信息熵,实验表明,中文信良熵不大于4.1bits/字。(2)根据中文的结构特性,选择Welch型的Lemple-Ziv数据压缩算法,把它移植、扩展于中文文本压缩上。应用该算法于不同类型的中文文本,本文获得一些中文文本压缩实际性能值。 相似文献
6.
Pengfei Hu Kai Xing Liusheng Huang Yang Wang Dapeng Wang Pei Li.School of Computer Science Technology University of Science Technology of China Hefei China .Suzhou Institute for Advanced Study University of Sciences Technology of China Suzhou .Alcatel-Lucent Shanghai Bell Shanghai .College of Information Systems Management National University of Defense Technology Changsha 《清华大学学报》2011,16(5):553-558
This paper proposes a multi-axis projection (MAP) based giant component formation strategy via the Maximal Independent Set (MIS) in a random unit-disk graph.We focus on the problem of virtual back-bone construction in wireless ad hoc and sensor networks,where the coverage areas of the nodes are disks with identical radii.In the simulation,we show that the MAP-based giant component has the ability to connect most nodes and serves as a backbone in the network.The algorithm is localized and may play an important role in efficiently constructing a virtual backbone for ad hoc and sensor networks. 相似文献
7.
Insulin-like growth factor-II gene expression in Wilms' tumour and embryonic tissues 总被引:4,自引:0,他引:4
J Scott J Cowell M E Robertson L M Priestley R Wadey B Hopkins J Pritchard G I Bell L B Rall C F Graham 《Nature》1985,317(6034):260-262
Wilms' tumour (nephroblastoma) is an embryonal neoplasm occurring in hereditary and spontaneous forms. Both types show rearrangements of the short arm of chromosome 11. The germ line of children with the rare inherited triad of aniridia, genito-urinary abnormality and mental retardation carry a chromosome 11 that has a deletion in its short arm (band 11p13) and these children are at increased risk of developing Wilms' tumour. Neonates with the Beckwith-Wiedemann syndrome, in which there may be duplication of the 11p13-11p15 region, are similarly predisposed. In the spontaneous form of the tumour a deletion of the 11p14 band in tumour cells, but not in normal cells, has been reported, and the development of homozygosity for recessive mutations in the 11p region is implicated in the aetiology of Wilms' tumour. In view of these chromosomal rearrangements and because Wilms' tumour is histologically indistinguishable from the early stages of kidney development, we have now examined the expression of genes localized to 11p in Wilms' tumour and human embryonic tissue. In 12 sporadic tumours examined, the expression of the gene coding for insulin-like growth factor-II (IGF-II), localized to the 11p15 region, was markedly increased relative to adult tissues, but was comparable to the level of expression in several fetal tissues including kidney, liver, adrenals and striated muscle. This may reflect the stage of tumour differentiation, but could also contribute to the malignant process, as IGF-II is an embryonal mitogen. 相似文献
8.
9.
10.