全文获取类型
收费全文 | 5759篇 |
免费 | 430篇 |
国内免费 | 265篇 |
专业分类
化学 | 1658篇 |
晶体学 | 32篇 |
力学 | 2483篇 |
综合类 | 22篇 |
数学 | 923篇 |
物理学 | 1336篇 |
出版年
2024年 | 6篇 |
2023年 | 75篇 |
2022年 | 105篇 |
2021年 | 98篇 |
2020年 | 135篇 |
2019年 | 114篇 |
2018年 | 126篇 |
2017年 | 154篇 |
2016年 | 199篇 |
2015年 | 143篇 |
2014年 | 201篇 |
2013年 | 359篇 |
2012年 | 289篇 |
2011年 | 344篇 |
2010年 | 266篇 |
2009年 | 340篇 |
2008年 | 309篇 |
2007年 | 316篇 |
2006年 | 273篇 |
2005年 | 326篇 |
2004年 | 226篇 |
2003年 | 231篇 |
2002年 | 202篇 |
2001年 | 169篇 |
2000年 | 142篇 |
1999年 | 121篇 |
1998年 | 112篇 |
1997年 | 112篇 |
1996年 | 91篇 |
1995年 | 118篇 |
1994年 | 87篇 |
1993年 | 84篇 |
1992年 | 54篇 |
1991年 | 72篇 |
1990年 | 53篇 |
1989年 | 45篇 |
1988年 | 66篇 |
1987年 | 55篇 |
1986年 | 55篇 |
1985年 | 42篇 |
1984年 | 32篇 |
1983年 | 15篇 |
1982年 | 44篇 |
1981年 | 15篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1971年 | 4篇 |
1970年 | 2篇 |
1957年 | 2篇 |
排序方式: 共有6454条查询结果,搜索用时 31 毫秒
101.
Summary Methods for the determination of specific migration of polymer additives from polypropylene to aqueous acetic acid and isooctane have been studied. The migrants were extracted from aqueous acetic acid and characterized by supercritical fluid chromatography (SFC) with flame ionization detection (FID) and mass spectrometry (MS). The isooctane simulant was concentrated and injected directly into the SFC. Injection of extracts after incubation, using the solvent venting injection technique in the SFC, enabled additive concentrations as low as 10 ppb in 150 ml simulant to be determined, corresponding to a specific migration level of approximately 1 g additive/dm2 polymer. 相似文献
102.
103.
在仅以碘化钾为重原子微扰剂、亚硫酸钠为除氧剂及无任何保护性介质存在的水溶液中 ,吲哚_3_丁酸 (IBA)能发射很强的室温光 (RTP) ;详细研究了分析测定条件及有机溶剂对RTP的影响 ;在最大光波长λex/λem =281/447nm处 ,光强度与IBA浓度在2.0×10 -7~1.0×10 -5mol/L范围内呈良好的线性关系 ,检出限4.3×10-8 mol/L ;方法直接用于强化水样和土壤中IBA的测定 ,回收率96 %~104 % ,相对标准偏差2.37 %~3.97 %。 相似文献
104.
A comparison is made between dichlorosilanes and cyclic siloxanes as starting materials in the synthesis of stationary phases for capillary gas chromatography (CGC) and supercritical fluid chromatography (SFC). Siloxanes containing one or more of the side groups methyl, vinyl, phenyl, and cyanoethyl in various ratios were synthesized and compared. These phases were characterized by chromatographic (gel permeation, GPC), spectroscopic (IR, 1H NMR, 29Si NMR), and thermal (DSC) methods. Coated fused silica columns were evaluated with respect to polarity, crosslinkability with several free-radical initiators, and thermal stability. A new liquid phase, 7% cyanoethyl, 7% phenyl, 1% vinyl methyl polysiloxane is shown to be more polar than OV-1701, more temperature stable, easily crosslinked and suitable for use in supercritical fluid chromatography. 相似文献
105.
Synthesis and characterization of monodisperse magnetic composite particles for magnetorheological fluid materials 总被引:2,自引:0,他引:2
Jung-Bae Jun Seong-Yong Uhm Jee-Hyun Ryu Kyung-Do Suh 《Colloids and surfaces. A, Physicochemical and engineering aspects》2005,260(1-3):157-164
Monodisperse magnetic composite particles (MCP) were prepared and characterized for a study of magnetic field-responsive fluids. Magnetic composite particles used are iron oxide-coated polymer composite particles, which were synthesized through in situ coating of iron oxide onto pre-existing polymer particles by the reduction of ferrous fluids. For a uniform and bulk coating of iron oxide, the porous structure was introduced into the substrate polymer particles through a two-step seeded polymerization method. Moreover, surface cyano-functionality was born from acrylonitrile unit of substrate polymer and it played an important role in obtaining successful uniform coating. The structure of the composite particle was analyzed by using a thermo gravimetric analysis (TGA) and a X-ray diffraction (XRD) analysis. The magnetization property of the particle was also observed. Then, the rheological properties of monodisperse magnetorheological (MR) suspensions of magnetic composite particles were examined under a magnetic field using a parallel-plate type commercial rheometer. From the rheological measurements, it was found that MR properties of the magnetic composite suspensions are dependent on the iron oxide content and the fluid composition. 相似文献
106.
Daixin Tong Keith D. Bartle Anthony A. Clifford Robert E. Robinson 《Journal of separation science》1992,15(8):505-509
A unified approach to sequential gas and supercritical fluid Chromatography using 50 μm i.d. open tubular columns is described. Sample introduction is performed by means of a rotary injection valve. In order that linear velocities can be optimized independently, a second rotary valve in the chromatographic oven is used to direct the flow of column eluate to the flame ionization detector through either fused silica tubing in GC, or a frit restrictor in SFC. Applications of sequential GC-SFC on a 50 μm i.d. open tubular column are demonstrated, and comparisons made between sequential GC-SFC on 50 and 100 μm i.d. columns. 相似文献
107.
We have observed an unusual reduction of shear stress with increasing shear rate under direct current electric fields, for
an electrorheological fluid composed of sulfonated poly(styrene-co-divinylbenzene) particles dispersed in silicone oil. At all shear rates, the shear stress under the electric field is larger
than that in the absence of the field, indicating that there is still some field-induced agglomeration of the particles. In
contrast, the behavior under alternating current electric fields is the Bingham-fluid-type response commonly observed with
electrorheological fluids. It is suggested that the conventional dipole–dipole interaction approach based on simplified microstructural
models would be unable to explain these phenomena.
Received: 27 November 2000 Accepted: 22 May 2001 相似文献
108.
Sameena Ashraf Keith D. Bartle Anthony A. Clifford Robert Moulder 《Journal of separation science》1992,15(8):535-538
Lubricating oil additives have been analyzed by supercritical fluid chromatography on open tubular and packed capillary columns. Carbon dioxide and modified carbon dioxide were used as mobile phases and detection was accomplished by flame ionization and micro UV. Rapid and efficient analysis of the lubricating oil additives was demonstrated. 相似文献
109.
Summary This work describes the study of a degradation curve of Oxadixyl in field-treated potato and tomato samples. The residues
were extracted using classical and supercritical fluid (SFE) extraction methods and analyzed by HRGC/ECD. The extraction techniques
were compared and the results indicate the advantages of using SFE as an alternative method for pesticide analyses in these
samples. 相似文献
110.
In this paper, we present a rheological study of a compact layer of highly swollen gel beads. The flow regimes of these systems are modelled by an elastic sinusoid moving in a Newtonian fluid. This model predicts a yield stress varying with the square root of the elastic modulus of the gel bead. The slope at the origin (at zero velocity) of the flow curve is expected to depend only on geometrical parameters and on the solvent viscosity. The experimental data are in qualitative agreement with the theoretical predictions. 相似文献