全文获取类型
收费全文 | 2726篇 |
免费 | 199篇 |
国内免费 | 294篇 |
学科分类
工业技术 | 3219篇 |
出版年
2024年 | 8篇 |
2023年 | 59篇 |
2022年 | 85篇 |
2021年 | 101篇 |
2020年 | 113篇 |
2019年 | 88篇 |
2018年 | 62篇 |
2017年 | 95篇 |
2016年 | 85篇 |
2015年 | 95篇 |
2014年 | 154篇 |
2013年 | 179篇 |
2012年 | 178篇 |
2011年 | 213篇 |
2010年 | 169篇 |
2009年 | 153篇 |
2008年 | 97篇 |
2007年 | 142篇 |
2006年 | 116篇 |
2005年 | 125篇 |
2004年 | 119篇 |
2003年 | 106篇 |
2002年 | 103篇 |
2001年 | 65篇 |
2000年 | 52篇 |
1999年 | 45篇 |
1998年 | 46篇 |
1997年 | 43篇 |
1996年 | 33篇 |
1995年 | 36篇 |
1994年 | 28篇 |
1993年 | 37篇 |
1992年 | 46篇 |
1991年 | 24篇 |
1990年 | 28篇 |
1989年 | 30篇 |
1988年 | 25篇 |
1987年 | 11篇 |
1986年 | 8篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1974年 | 1篇 |
1961年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有3219条查询结果,搜索用时 0 毫秒
1.
Timo M. Kauppinen 《Journal of Housing and the Built Environment》2002,17(2):173-197
Finland has experienced a rapid increase inimmigration since the beginning of the 1990s.Almost half of the foreign population isconcentrated in the metropolitan area of thecapital, Helsinki. The development andexplanations of their settlement patterns havenot yet been thoroughly studied. It ishypothesised in this study that social housingcan explain the settlement patterns. Indices ofdissimilarity were calculated to study thelevel and development of spatial segregation ofimmigrant groups in the Helsinki metropolitanarea in 1995–99, and the association betweenthe settlement patterns of immigrants andsocial housing was studied by regressionanalysis. Neighbourhood-level data were used.The results indicate that the Helsinkimetropolitan area has avoided extreme ethnicsegregation so far and that segregation isdecreasing. Especially immigrants from poorcountries are clearly associated with socialhousing in their settlement patterns, evenafter adjustment for socio-economic anddemographic differentiation. Also newconstruction of social housing seems to haveaffected the spatial distribution of thisgroup. Despite this dependence, the group isnot extremely segregated, which is probablybecause the social housing sector is nottotally marginalised. 相似文献
2.
高温和低张应力引起的非平衡晶界偏聚动力学(Ⅱ)--实验结果的动力学模拟 总被引:2,自引:2,他引:0
以文献[1]建立的张应力引起的非平衡晶界偏聚动力学方程模拟了Shinoda T等的磷在钢中的应力时效实验结果和Misra R D K的硫在钢中的应力时效实验结果,模拟结果与实验结果互相吻合。通过模拟发现,张应力使磷-空位复合体以及硫-空位复合体在钢中的扩散系数均增加3个数量级,且磷原子和硫原子的扩散系数分别降低3个和5个数量级。 相似文献
3.
This paper is a summary of an extensive research program carried out by the authors on the structure of rapidly solidified aluminum alloys; and a comparison with the work of others also involved in this field. The paper discusses the changes in the dendritic and non-dendritic structure of the matrix at cooling rates from 10–3 to 1010 K/s and discusses the hetergeneity of the structure caused by interdendritic-segretion during solidification. 相似文献
4.
Sei-Ichi Aiba Masato Izume Norihiko Minoura Yukihiko Fujiwara 《Polymer International》1985,17(1):38-40
Chitin membrane was prepared by casting a N,N-dimethyl acetamide, N-methyl 2-pyrrolidone and lithium chloride (DMA-NMP-LiCl)solution of chitin and coagulating with several media. The effect of the coagulants on membrane formation was studied. 2-Propanol was found to be more favourable than methanol, ethanol, acetone and mixtures of 2-propanol and water. The membrane obtained in 2-propanol was subjected to annealing. Annealing made the membrane dense and strong. The tensile strength of the membrane annealed at 145°C for 2hr was about twice that of an unannealed membrane. The solute permeability of the annealed membranes was lower than that of the original one. These phenomena could be clearly interpreted in terms of crystallinity. 相似文献
5.
6.
A modification of the well-known water-quality model 'quality simulation along river systems'(QUASAR) is presented in order to extend its ability, so that it may be considered applicable under unsteady-flow conditions. An aggregated dead-zone travel-time parameter, based on (a) the kinematic wave velocity (celerity) of the flow wave and (b) the behaviour of the solute within so-called 'dead zones', has been incorporated into the existing model formulation. This extends the current continuously-stirred tank reactor-based model process to account for the behaviour of solute under unsteady-flow conditions. The enhanced water-quality model has been validated by application to the Colorado River. 相似文献
7.
8.
W. Ming F. Melis R. D. van de Grampel L. van Ravenstein M. Tian R. van der Linde 《Progress in Organic Coatings》2003,48(2-4):316-321
Self-stratification strategy can be used to prepare films in which both bulk and surface properties can be optimized. By using this approach, only a very small quantity of fluorinated species is needed to generate a surface with low surface energy. When cross-linking is involved during film formation, we are dealing with a competition behavior between the diffusion of fluorinated species and the formation of cross-linked network. In this study low surface energy polymeric films were prepared on the basis of partially fluorinated polyisocyanates, in combination with hydroxyl-end-capped three-armed solventless liquid oligoesters and modified hyperbranched polyesters. At a fluorine concentration of only 0.5 wt.%, contact angles of water and hexadecane can reach 120° and 80°, respectively. A surface energy as low as 10–15 mN/m can be obtained upon the addition of less than 1 wt.% of fluorine in the films. It was shown, from real time ATR-FTIR and contact angle measurements, that the curing temperatures demonstrated significant effects on the cross-linking rate as well as on the wettability of the films. 相似文献
9.
Alfalfa juice was extracted from plants during the graving phases of the first and second crops. The alfalfa juice was dried and solute concentrations were measured periodically during the process using freezing point depression (FPD) as an indicator. Solute/solvent weight ratios were calculated from the freezing point depression of fresh unconcentrated 'uice extracted from both firsc and second crops. At the time of harvest, tie FPD was a function of this ratio. The first and second crops behaved distinctively different during the drying process, with the second having a larger soluce concentration and a greater FPD at a given moisture content. The appearance of preci itate during the drying process and the general1 large FPD makes this materiay a questionable product for drying vitg low temperature processes. 相似文献
10.
B~(10)(n,α)Li~7裂变反应的径迹显微照相技术被用来研究含硼Fe-30%Ni合金高温热变形再结晶过程中硼在晶界上的偏聚行为,实验表明,含硼Fe-30%Ni合金1000℃热变形20%再结晶过程中,运动晶界前方发生硼偏聚而后方发生贫硼现象,而在静止晶界上看不到硼偏聚,随着再结晶新晶粒的长大,运动晶界上的硼偏聚变弱。本文提出,可以用晶界对溶质原子热运动散射的量子理论来解释溶质原子在运动晶界上的偏聚现象。 相似文献