全文获取类型
收费全文 | 7140篇 |
免费 | 578篇 |
国内免费 | 375篇 |
专业分类
电工技术 | 315篇 |
技术理论 | 1篇 |
综合类 | 577篇 |
化学工业 | 1668篇 |
金属工艺 | 584篇 |
机械仪表 | 446篇 |
建筑科学 | 864篇 |
矿业工程 | 262篇 |
能源动力 | 127篇 |
轻工业 | 540篇 |
水利工程 | 121篇 |
石油天然气 | 706篇 |
武器工业 | 40篇 |
无线电 | 150篇 |
一般工业技术 | 863篇 |
冶金工业 | 519篇 |
原子能技术 | 38篇 |
自动化技术 | 272篇 |
出版年
2024年 | 17篇 |
2023年 | 64篇 |
2022年 | 125篇 |
2021年 | 156篇 |
2020年 | 178篇 |
2019年 | 159篇 |
2018年 | 164篇 |
2017年 | 204篇 |
2016年 | 243篇 |
2015年 | 274篇 |
2014年 | 386篇 |
2013年 | 515篇 |
2012年 | 515篇 |
2011年 | 547篇 |
2010年 | 391篇 |
2009年 | 407篇 |
2008年 | 361篇 |
2007年 | 461篇 |
2006年 | 435篇 |
2005年 | 375篇 |
2004年 | 332篇 |
2003年 | 267篇 |
2002年 | 244篇 |
2001年 | 190篇 |
2000年 | 196篇 |
1999年 | 170篇 |
1998年 | 129篇 |
1997年 | 99篇 |
1996年 | 94篇 |
1995年 | 74篇 |
1994年 | 54篇 |
1993年 | 51篇 |
1992年 | 42篇 |
1991年 | 22篇 |
1990年 | 36篇 |
1989年 | 33篇 |
1988年 | 23篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1982年 | 7篇 |
1964年 | 5篇 |
1961年 | 3篇 |
1960年 | 2篇 |
1959年 | 1篇 |
1957年 | 1篇 |
1955年 | 1篇 |
1954年 | 1篇 |
1951年 | 2篇 |
排序方式: 共有8093条查询结果,搜索用时 15 毫秒
51.
An easy pot incubation method for measuring nitrogen mineralization from easily decomposable organic material under well defined conditions 总被引:1,自引:0,他引:1
K. Thorup-Kristensen 《Nutrient Cycling in Agroecosystems》1994,38(3):239-247
A pot incubation method for measuring mineralization dynamics from fresh plant material was tested. The aim was to develop a method which under well-defined conditions could produce mineralization data suited for estimating model input parameters for nitrogen prediction models. The results showed that the water tension of the soil could be controlled easily and precisely by diffusion through porous ceramic cups, and that nitrogen mineralization or immobilization could be measured already after 15 days at 15°C. The results showed that for the incubated catch crop residues carbon, nitrogen and nitrate-N contents were the most important factors determining mineralization. No significant effects ould be ascribed to other parameters measured. 相似文献
52.
53.
54.
Isaias Ochoa 《Powder Technology》2005,153(2):108-118
The effects of the lubricant physical properties on the processing of polytetrafluoroethylene (PTFE) fine powder resins are studied. Lubricants having different surface tension and viscosity were used; the two properties changed independently. These effects were studied by using dies of various contraction angle and reduction ratio for resins having a variety of molecular architecture. It was found that the wettability (surface tension) of the lubricant strongly affects the pressure needed to extrude the PTFE pastes. The viscosity of the lubricant was also found to play a significant role in the process since a lubricant with a low viscosity causes the paste to be extruded at a lower pressure. These effects of the physical properties on the extrusion pressure influence significantly the mechanical properties of the final extrudates. The latter are functions of the degree of fibrillation, which is significantly influenced by the wettability and viscosity of lubricants. Finally, the effects of die geometry on extrusion pressure and mechanical properties of extrudates were also assessed in order to determine the geometrical characteristics and operation conditions for the optimization of the process. 相似文献
55.
Hyun‐Ah Kang Gyu‐Jong Jeon Moo‐Yeal Lee Ji‐Won Yang 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(2):205-210
A series of alginate‐derived polymeric surfactants (APSs) with a linear alkyl group (C8, C12, C16) was synthesized by oxidation followed by reductive amination of 2,3‐dialdehydic alginate. The products were characterized by measuring IR spectra, NMR spectra, surface tension and critical micelle concentration (cmc). They were also tested for the solubilization of azobenzene and adsorption of heavy metal. In the case of 40% CHO‐C8 APSs, the lowest interfacial tension value (31.5 m Nm?1) was obtained at the cmc value of 1.35 g dm?3. The dissolving capacity of 40% CHO‐C8 APS towards azobenzene was 27 times greater than that of alginate. The overall cobalt (Co2+) removal efficiency by adsorption using APSs was high compared with that of sodium alginate at pH 3, 5 and 7. Equilibrium aspects of cobalt adsorption onto 10% CHO‐APSs were studied, and the results show that APSs had high equilibrium capacities for cobalt uptake, 115.5 mgg?1. © 2002 Society of Chemical Industry 相似文献
56.
57.
The vacuum residual from Iranian Light crude oil are separated into a series of 16 narrow fractions according to the molecular weight by the supercritical fluid extraction and fractional (SFEF) technology. The chemical element and the UV spectrum of each fraction are analyzed. The effects of several factors on the interfacial tension are investigated, which are the fraction concentration in oil phase, the ratio of oil component, the salts dissolved in the water phase and the pH value. The interfacial tension decreases rapidly as the concentration of the residual fraction in the oil increases, showing a higher interfacial activity of the fraction. The interfacial tension changes, as the amount of absorption or the state of the fractions in the interface changes resulting from different ratios of oil, different kinds or concentrations of salts in water, and different pH values. It is concluded that the intrfacial tension changes regularly, corresponding to the regular molecular parameters of the vacuum residual fractions. 相似文献
58.
A series of novel nonionic functional polyurethane surfactants were synthesized by the polycondensation of 2,4‐toluene diisocyanate with poly(propylene oxide) (weight‐average molecular weight = 400, 1000, or 2000) and monoallyl‐end‐capped poly(ethylene oxide). The chemical structure of the polyurethane surfactants was determined by Fourier transform infrared and 1H‐NMR, and the effects of the concentration, salt, rest time, and temperature on the surface tension were investigated. These polymeric surfactants exhibited excellent surface activity. Sample III, which was synthesized with monoallyl‐end‐capped poly(ethylene oxide) (number‐average molecular weight = 1000), poly(propylene oxide) (number‐average molecular weight = 2000), and tolylene diisocyanate, could reduce the surface tension to 37.6 mN/m at a concentration of 0.06 mol/L at 25°C. All polyurethane surfactants synthesized in this study had low critical micelle concentrations (ca. 10?4 to 10?5 mol/L) and could reduce the surface tension even at very low concentration levels. Moreover, the surface tension decreased with an increase in the temperature or the concentration of the polyurethane surfactants. The addition of salt resulted in a decrease in the surface tension, and it took some time for the polyurethane surfactants to reach a constant surface tension value. UV spectra were found to be very useful for determining the critical micelle concentration. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2956–2962, 2006 相似文献
59.
E. D. Goddard 《Journal of the American Oil Chemists' Society》1994,71(1):1-16
The field of polymer/surfactant interaction is reviewed in this work. Results from two investigative methods,viz., dialysis and surface tension, are discussed, illustrating the main behavioral patterns and outlining the principles of the
interactions. Next, aspects of the interaction phenomena that appear to have relevance to detergent formulation are presented.
These include solution rheology, solubility control and surface conditioning. Lastly, the importance of surface activity of
the polymer itself is stressed, culminating in a discussion of the properties of hydrophobically modified water-soluble polymers
(“polymeric surfactants”), both alone and in the presence of conventional surfactants.
Based on the Samuel Rosen Memorial Award lecture, given at the AOCS Annual Meeting, Anaheim, CA, April 1993. 相似文献
60.
Nabel?A.?NegmEmail author Salwa?M.?I.?Morsy 《Journal of surfactants and detergents》2005,8(3):283-287
A weight loss technique was used to determine the corrosion inhibition efficiency of synthesized alkyl mono-and dibenzoate
triethanolammonium bromide derivatives (TEAMB, TEADB) in an acidic medium (2 N HCl) at different doses (50, 100, and 200 ppm).
The results showed that monoderivatives had a higher corrosion inhibition efficiency than diderivatives. The results were
correlated with several factors, including the alkyl chain length of the hydrophobic chains, interfacial tension (IT), critical
micelle concentration (CMC), and adsorption free energy of these inhibitors. Increasing the geometric length of the alkyl
chains in the synthesized inhibitors had an increasing effect on their corrosion inhibition efficiency, whereas decreasing
the CMC and IT had an increasing effect on their tendency toward corrosion inhibition. The number of hydrophobic chains attached
to the inhibitor molecules had a vital influence on their efficiency as corrosion inhibitors. 相似文献