全文获取类型
收费全文 | 2008篇 |
免费 | 143篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 24篇 |
综合类 | 2篇 |
化学工业 | 551篇 |
金属工艺 | 44篇 |
机械仪表 | 33篇 |
建筑科学 | 79篇 |
矿业工程 | 1篇 |
能源动力 | 72篇 |
轻工业 | 238篇 |
水利工程 | 6篇 |
石油天然气 | 2篇 |
无线电 | 211篇 |
一般工业技术 | 395篇 |
冶金工业 | 49篇 |
原子能技术 | 36篇 |
自动化技术 | 414篇 |
出版年
2024年 | 1篇 |
2023年 | 20篇 |
2022年 | 48篇 |
2021年 | 65篇 |
2020年 | 51篇 |
2019年 | 45篇 |
2018年 | 62篇 |
2017年 | 72篇 |
2016年 | 67篇 |
2015年 | 78篇 |
2014年 | 103篇 |
2013年 | 160篇 |
2012年 | 137篇 |
2011年 | 221篇 |
2010年 | 146篇 |
2009年 | 135篇 |
2008年 | 126篇 |
2007年 | 87篇 |
2006年 | 88篇 |
2005年 | 79篇 |
2004年 | 58篇 |
2003年 | 63篇 |
2002年 | 45篇 |
2001年 | 24篇 |
2000年 | 20篇 |
1999年 | 29篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 23篇 |
1995年 | 6篇 |
1994年 | 17篇 |
1993年 | 15篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有2157条查询结果,搜索用时 10 毫秒
51.
Lukas C. Buelens Vladimir V. Galvita Hilde Poelman Christophe Detavernier Guy B. Marin 《化学,工程师,技术》2016,88(11):1684-1692
The kinetics of redox reactions of iron oxide in oxygen carrier 50Fe2O3/MgAl2O4 are examined using different time‐resolved techniques. Reduction kinetics are studied by H2 temperature‐programmed reduction (H2‐TPR) monitored by time‐resolved in situ XRD. In contrast to conventional TPR, in situ XRD distinguishes the three‐stage reduction of Fe2O3 → Fe3O4 → FeO → Fe. It also shows that the oxidation of Fe → Fe3O4 by CO2 has no intermediate crystalline phases, explaining why its kinetics can easily be investigated by conventional CO2 temperature‐programmed oxidation (CO2‐TPO). A shrinking core model which takes into account solid state diffusion allows describing the experimental data. 相似文献
52.
Eline Pottie Jolien Storme Christophe P. Stove 《International journal of molecular sciences》2022,23(7)
The P2Y2 receptor (P2Y2R) is a G protein-coupled receptor that is activated by extracellular ATP and UTP, to a similar extent. This allows it to play roles in the cell’s response to the (increased) release of these nucleotides, e.g., in response to stress situations, including mechanical stress and oxygen deprivation. However, despite its involvement in important (patho)physiological processes, the intracellular signaling induced by the P2Y2R remains incompletely described. Therefore, this study implemented a NanoBiT® functional complementation assay to shed more light on the recruitment of β-arrestins (βarr1 and βarr2) upon receptor activation. More specifically, upon determination of the optimal configuration in this assay system, the effect of different (receptor) residues/regions on βarr recruitment to the receptor in response to ATP or UTP was estimated. To this end, the linker was shortened, the C-terminal tail was truncated, and phosphorylatable residues in the third intracellular loop of the receptor were mutated, in either singly or multiply adapted constructs. The results showed that none of the introduced adaptations entirely abolished the recruitment of either βarr, although EC50 values differed and time-luminescence profiles appeared to be qualitatively altered. The results hint at the C-terminal tail modulating the interaction with βarr, while not being indispensable. 相似文献
53.
54.
55.
56.
Liangcai Lei Christophe Detrembleur Mélanie Jeusette Philippe Leclère Roberto Lazzaroni Robert Jérôme 《大分子材料与工程》2011,296(2):122-130
A PS‐b‐PIP‐b‐PMMA copolymer has been melt‐blended with homo‐PMMA with a similar molecular weight as the PMMA block. For a 50:50 wt.‐% mixture, the components form 3D bicontinuous lamellae. Upon annealing at 190 °C, a more regular network is observed, which consists of PMMA and 55 nm‐thick bilayered lamellae of triblock copolymer, both being continuous. This co‐continuity persists even when $\overline {M} _{{\rm n}} $ of the homo‐PMMA is twice that of the PMMA block in the copolymer. For 30:70 and 20:80 wt.‐% copolymer/homopolymer pair, the copolymer forms cylindrical and spherical phases, respectively. Blends have also been prepared by solvent casting. Large domains of copolymer interconnected by few lamellae are observed in the 50:50 blend that reorganize into a bicontinuous network upon annealing.
57.
Pascal Laurent Hary Razafindralambo Bernard Wathelet Christophe Blecker Jean-Paul Wathelet Michel Paquot 《Journal of surfactants and detergents》2011,14(1):51-63
Short chemical syntheses were developed to produce a new set of surfactants from uronic acids derived from widely available
raw materials. Three different strategies were used to synthesize uronic amide derivatives, the structures of which were totally
characterized by spectrometric methods (IR, MS, 1H-RMN and 13C-RMN). The best one, using an acid chloride as the synthetic intermediate, furnished the expected amides as a mixture of
anomers in 46–58% global yield. Surface-active properties (CMC, γcmc, Γmax, A
min) of homologous series of uronic acid N-alkylamides from C8 to C18 were also assessed. In general, these sugar-based surfactants exhibited good surface-activities,
and appeared as valuable nonionic surfactants compared to octylphenol 9–10 ethylene oxide condensate, the most well-known
nonionic surfactant. Increasing the alkyl chain length influenced the CMC values for both glucuronic and galacturonic N-alkylamide derivatives. The galacturonic N-alkylamides decreased γcmc at slower values than their counterpart’s glucuronic N-alkylamides. 相似文献
58.
Camara N Jouault B Jabakhanji B Caboni A Tiberj A Consejo C Godignon P Camassel J 《Nanoscale research letters》2011,6(1):141
Using high-temperature annealing conditions with a graphite cap covering the C-face of, both, on axis and 8° off-axis 4H-SiC
samples, large and homogeneous single epitaxial graphene layers have been grown. Raman spectroscopy shows evidence of the
almost free-standing character of these monolayer graphene sheets, which was confirmed by magneto-transport measurements.
On the best samples, we find a moderate p-type doping, a high-carrier mobility and resolve the half-integer quantum Hall effect typical of high-quality graphene samples.
A rough estimation of the density of states is given from temperature measurements. 相似文献
59.
The equivalent inclusion method (EIM) assuming linear elasticity is used to calculate the mechanical interactions between spherical rubber particles in an amorphous matrix, as in a rubber toughened polymer. The influences of the various calculation parameters are examined and it is shown that the method can provide reliable results with regard to the level of hydrostatic stress in the particles. Damage of the material is simulated by replacing the most stressed particles by voids. Numerical simulations for several hundreds of interacting particles give information on the kinetics and spatial organisation of the damage. It appears that, as the volume fraction of particles increases from 10 to 20%, the spatial configuration of the damage evolves from a localised to a diffuse mode. These results are discussed in relation to the efficiency of rubber toughening. 相似文献
60.
Christophe Malabat Ra I S nchez-Vioque Claude Rabiller Jacques Gu guen 《Journal of the American Oil Chemists' Society》2001,78(3):235-242
The 2S and 12S proteins of rapeseed were isolated and subsequently hydrolyzed by pepsin or a combination of pepsin plus trypsin.
The resulting hydrolysates had a 15% degree of hydrolysis and were purified by gel filtration chromatography in order to obtain
homogeneous peptide fractions. Three major fractions, having an average peptide chain length of 7.5–11 amino acids, were recovered.
Purified peptide fractions were acylated with butyric anhydride and sulfamidated with p-toluenesulfonyl chloride. The degree of modification was always higher than 90%. Emulsifying and foaming properties of native
and chemically modified peptides were studied and compared to those of sodium dodecyl sulfate (SDS) as standard. A peptide
fraction from the 15% hydrolysis of the 12S protein exhibited the best foaming properties. After sulfamidation, this peptide
fraction showed a foam formation similar to that of SDS. Whereas the attachment of toluene groups generally improved the surface
properties, the incorporation of an aliphatic chain of four atoms of carbon was detrimental in most of the cases. On the other
hand, none of the native or hydrophobized peptide fractions was able to form a stable emulsion. 相似文献