全文获取类型
收费全文 | 39094篇 |
免费 | 6213篇 |
国内免费 | 1239篇 |
专业分类
电工技术 | 2532篇 |
综合类 | 3661篇 |
化学工业 | 15810篇 |
金属工艺 | 1071篇 |
机械仪表 | 1937篇 |
建筑科学 | 1312篇 |
矿业工程 | 373篇 |
能源动力 | 512篇 |
轻工业 | 3022篇 |
水利工程 | 416篇 |
石油天然气 | 1271篇 |
武器工业 | 247篇 |
无线电 | 2165篇 |
一般工业技术 | 3204篇 |
冶金工业 | 850篇 |
原子能技术 | 349篇 |
自动化技术 | 7814篇 |
出版年
2024年 | 69篇 |
2023年 | 199篇 |
2022年 | 635篇 |
2021年 | 662篇 |
2020年 | 705篇 |
2019年 | 744篇 |
2018年 | 852篇 |
2017年 | 813篇 |
2016年 | 1018篇 |
2015年 | 898篇 |
2014年 | 4395篇 |
2013年 | 3584篇 |
2012年 | 4871篇 |
2011年 | 4975篇 |
2010年 | 4206篇 |
2009年 | 4005篇 |
2008年 | 2075篇 |
2007年 | 1558篇 |
2006年 | 1608篇 |
2005年 | 1252篇 |
2004年 | 1138篇 |
2003年 | 1027篇 |
2002年 | 883篇 |
2001年 | 816篇 |
2000年 | 703篇 |
1999年 | 633篇 |
1998年 | 504篇 |
1997年 | 347篇 |
1996年 | 297篇 |
1995年 | 242篇 |
1994年 | 199篇 |
1993年 | 162篇 |
1992年 | 151篇 |
1991年 | 74篇 |
1990年 | 50篇 |
1989年 | 43篇 |
1988年 | 24篇 |
1987年 | 28篇 |
1986年 | 17篇 |
1985年 | 24篇 |
1984年 | 14篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1959年 | 1篇 |
1951年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
We determined variation in both the concentration and composition of terpenoids in needles and wood within nine Scots pine (Pinus sylvestris) provenances. Seedlings of different provenances representing a 1200-km N–S transect from Estonia to northern Finland were cultivated in Suonenjoki nursery field, central Finland, for seven years. Growth of seedlings and the number of vertical resin ducts in wood were also determined. -Pinene and 3-carene were the major monoterpenes both in the needles and wood. The total monoterpene concentration was about five times higher in the needles than in the wood. A strong positive correlation was found between proportional quantities of several terpenes of the needles and wood, particularly for 3-carene, sabinene, and terpinolene. The needles contained both labdane-type and tricyclic resin acids, whereas the wood contained only tricyclic ones. The wood had a four times higher tricyclic resin acid concentration than the needles. The highest total monoterpene concentration in the needles and in the wood occurred in the most northern Muonio provenance and in the most southern Saaremaa provenance plants, respectively. The amount of high 3-carene genotype trees decreased among the northern provenances. The wood of the most northern Muonio provenance showed the lowest total resin acid concentration, but provenance did not affect total tricyclic resin acids in the needles. Korpilahti provenance trees from central Finland had the best growth in height. In addition, Korpilahti and Ruokolahti provenance trees showed largest radial growth of stem and smallest number of vertical resin ducts. The results suggest that especially the proportional quantity of 3-carene in the needles could be used in estimating the amount of this compound in the wood and vice versa. 相似文献
102.
103.
在选择三元共聚尼龙(PA)、聚氯乙烯(PVC)、丁腈橡胶(NBR)为主体材料,制备PA/PVC/NBR(10/30/60)三元共混弹性体的工作基础上,进一步探讨了填料品种和用量,共混温度,加料顺序等因素PA/PVC/NBR三元共混弹性体的影响。试验结果表明:在PA/PVC/NBR(10/30/60)共混体系中,补强型填料的补强效果优于非补强型的填料,6种填料补强效果依次是:快压出炭黑>半补强炭黑>白炭黑>活性重质,CaCO3>陶土>滑石粉,快压出炭黑的适宜用量是20-50份。在制备PA/PVC/NBR三元共混物时,适宜的共混温度是122-140℃,并且采用二段法混工艺制得的共混物性能优于采用一段法共混工艺。 相似文献
104.
A. Garea A. M. Urtiaga M. I. Ortiz A. I. Alonso J. A. Irabien 《Chemical Engineering Communications》1983,120(1):85-97
The study of the phenol separation-concentration process with the hollow fiber supported liquid membrane technology has been performed. Mixtures of kerosene and CYANEX 923 were used as liquid membrane. The extractant CYANEX 923 is characterized by a high phenol selectivity and an extremely low solubility in the aqueous phase. The introduction of CYANEX 923 in the membrane composition decreases the extractant losses from the pores of the support.
The phenol separation and simultaneous concentration process has been checked. The influences of the initial concentration of phenol in the feed solution and sodium hydroxide in the stripping phase and the membrane composition on the separation rate have been investigated in a single-pass mode. The analysis of the membrane composition influence has been performed according to the steady-state mass transfer conservation equation and the associated boundary conditions, leading to the mass transfer parameters of the process 相似文献
The phenol separation and simultaneous concentration process has been checked. The influences of the initial concentration of phenol in the feed solution and sodium hydroxide in the stripping phase and the membrane composition on the separation rate have been investigated in a single-pass mode. The analysis of the membrane composition influence has been performed according to the steady-state mass transfer conservation equation and the associated boundary conditions, leading to the mass transfer parameters of the process 相似文献
105.
106.
Zhiguang Xu 《Polymer》2007,48(20):6134-6144
Poly(?-caprolactone)-block-polydimethylsiloxane-block-poly(?-caprolactone) triblock copolymer (PCL-b-PDMS-b-PCL) was synthesized via the ring-opening polymerization of ?-caprolactone with dihydroxypropyl-terminated PDMS (HTPDMS) as the initiator. The triblock block copolymer was characterized by means of Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC). The triblock copolymer was incorporated to prepare nanostructured thermosetting blends. The morphology of the epoxy thermosets containing PCL-b-PDMS-b-PCL were investigated by means of atomic force microscopy (AFM), transmission electronic microscopy (TEM) and small-angle X-ray scattering (SAXS). The thermomechanical properties of the nanostructured blends were investigated by means of differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The formation of the nanostructures in the thermosetting composites was judged to follow the self-assembly mechanism in terms of the difference in miscibility of PDMS and PCL subchains with epoxy resin after and before curing reaction. 相似文献
107.
108.
采用脂环族环氧树脂、柔韧性环氧树脂、改性脂环胺类固化剂为主要原料,研制出户外像素管灌注软胶,产品具有耐紫外线辐照、耐冷热冲击、粘接性好等特点。介绍其制备方法、性能及用。 相似文献
109.
四官能环氧树脂的合成以及在覆铜板中的应用 总被引:1,自引:0,他引:1
对四官能环氧树脂[1,1,2,2-四(对羟基苯基)乙烷四缩水甘油醚]的合成与改性及在覆铜板中的应用作了初步探讨,并对其屏蔽紫外线与产生荧光的机理作用作了简单阐述。 相似文献
110.
由二氧化碳出发合成有机碳酸酯 总被引:4,自引:0,他引:4
对以二氧化碳为原料合成有机碳酸酯的环氧路线、酯交换和直接合成方法作了综合评述 ,认为直接合成是最佳的合成路线。碳酸酯的直接合成可在均相及多相催化体系中进行 ,负载金属、金属甲氧基化合物及碱均可作为催化剂。直接法研究的关键在于高性能催化剂的开发、由二氧化碳对金属 -氧键插入反应导致的催化循环的构筑及耦合反应的应用。 相似文献