全文获取类型
收费全文 | 38997篇 |
免费 | 2356篇 |
国内免费 | 1874篇 |
专业分类
化学 | 21839篇 |
晶体学 | 233篇 |
力学 | 3836篇 |
综合类 | 535篇 |
数学 | 8170篇 |
物理学 | 8614篇 |
出版年
2024年 | 46篇 |
2023年 | 343篇 |
2022年 | 606篇 |
2021年 | 1039篇 |
2020年 | 991篇 |
2019年 | 941篇 |
2018年 | 849篇 |
2017年 | 1079篇 |
2016年 | 1470篇 |
2015年 | 1090篇 |
2014年 | 1568篇 |
2013年 | 2760篇 |
2012年 | 2257篇 |
2011年 | 2029篇 |
2010年 | 1745篇 |
2009年 | 2256篇 |
2008年 | 2217篇 |
2007年 | 2514篇 |
2006年 | 2072篇 |
2005年 | 1881篇 |
2004年 | 1830篇 |
2003年 | 1517篇 |
2002年 | 1171篇 |
2001年 | 956篇 |
2000年 | 936篇 |
1999年 | 840篇 |
1998年 | 793篇 |
1997年 | 707篇 |
1996年 | 601篇 |
1995年 | 626篇 |
1994年 | 547篇 |
1993年 | 454篇 |
1992年 | 422篇 |
1991年 | 361篇 |
1990年 | 327篇 |
1989年 | 216篇 |
1988年 | 219篇 |
1987年 | 136篇 |
1986年 | 117篇 |
1985年 | 141篇 |
1984年 | 112篇 |
1983年 | 59篇 |
1982年 | 94篇 |
1981年 | 54篇 |
1980年 | 44篇 |
1979年 | 74篇 |
1978年 | 33篇 |
1977年 | 14篇 |
1976年 | 22篇 |
1973年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
931.
932.
流动注射—化学发光法测定苯甲醛 总被引:1,自引:0,他引:1
依据苯甲醛增强没食子酸-过氧化氢-氢氧化钠体系化学发光的性质,建立了苯甲醛的流动注射化学发光分析法。 相似文献
933.
大庆渣油族组分非等温热反应的研究 总被引:2,自引:0,他引:2
采用动态热重分析法在升温速率为6.2K·min ̄(-1)及惰性气流量100cm ̄3·min ̄(-1)的条件下,对大庆渣油族组分的热转化行为进行了考察,获得了族组分的热转化速率峰值、速率峰值处的反应温度、转化率和剧裂分解温度区间等动力学基本数据以及各族组分的生焦性能。数据分析表明,族组分的热反应活性顺序为:饱和分>胶质>芳香分>沥青质。在大庆渣油族组分热转化的两个温区内,采用分段一级动力学模型较好地拟合了实验数据,确定了各族组分在两个温区内的热反应动力学参数。 相似文献
934.
鲨鱼软骨质量的聚类分析法 总被引:3,自引:0,他引:3
用电感耦合等离子体原子发射光谱法(ICP-AES)测定了18个鲨鱼软骨真品中13个元素含量,对测定结果进行分析和变量聚类分析,抽提5个特征指标,并以谱系数聚类建立了鉴别鲨鱼软骨真伪的数学模式,用3个假冒产品和一个鲨鱼软骨胶囊对其进行检验,结果表明,用无机元素所建立的数学模式不仅能鉴别鲨鱼软骨的真伪,还能区分鲨鱼软骨的部分及不同部位的混合物。 相似文献
935.
Two types of commercial glass fibers were subjected to attack in strongly basic KOH solutions. The resulting leach solutions were analysed for Na, Ca, and Si. This showed that the corrosion process attacks the fibers incongruently. Although there are some distinct differences in the performance of these fibers, to a first approximation both types behave similarly. Further, the fibers were depth profiled using a recently developed SNMS technique for fiber in-depth analysis. This showed that both types of fibers behave in a quite dissimilar manner. The fibers were weathered already without any treatment. Although both fibers show alkali ion exchange and network splitting processes, on one of the fiber layers enriched in SiO2, Fe2O3, and CaO are formed by a redeposition process from the leach solution.Dedicated to Professor Dr. rer. nat. Dr. h.c. Hubertus Nickel on the occasion of his 65th birthday 相似文献
936.
动力学体系二维数据的秩分析及其应用 总被引:2,自引:0,他引:2
详细论证了动力学体系中存在的多种共线性情况,以及在此情况下二维数据阵的秩与独立反应数及组分数的关系.分析了通过增秩这一方式来判断体系组分数的条件.讨论了反应间存在物质交换对数据阵秩的影响.建立起一套通过秩分析判断未知动力学体系中存在的反应组分数、独立反应数以及可能反应机理的方法.将秩分析技术应用到聚苯胺与质子酸反应,初步分析了该体系存在的多种吸光性结构及结构变化.确定了[H+]=0.01~0.1 mol•L-1范围内,聚苯胺与质子酸反应存在一个三结构两步互变过程. 相似文献
937.
M Trætteberg L.S KhaikinO.E Grikina S.I KozhushkovA de Meijere 《Journal of Molecular Structure》2002,641(1):41-60
The molecular structure of 1,1-bis(trimethylsilylethynyl)cyclopropane has been studied by the gas electron diffraction method, by vibrational spectroscopic methods and by ab initio calculations at the RHF and MP2 levels. A scaled quantum-chemical force field was used for band assignment in the experimental IR (4000-100 cm−1) and Raman (4000-200 cm−1) spectra. The root-mean-square vibrational amplitudes and harmonic shrinkage corrections were calculated taking into account non-linear relations between Cartesian and internal vibrational coordinates at the level of first-order perturbation theory (h1) and with the use of the traditional scheme (h0). 相似文献
938.
Polarographic behaviour and determination of spironolactone 总被引:1,自引:0,他引:1
Fathalla Belal 《Mikrochimica acta》1992,107(1-2):11-17
The polarographic behaviour of spironolactone in Britton-Robinson buffers containing 40% methanol as a solubilizer was studied. Over the pH range 3-12 a cathodic wave was produced. The wave was characterized as irreversible, diffusion-controlled and partially affected by adsorption phenomena. The number of electrons involved in the reduction was found by coulometric measurements at a controlled potential. A method was developed for the determination of spironolactone in tablets and the results obtained were in agreement with those obtained by the B.P. 1988 method. The mechanism of the electrode reaction is discussed.AvH scholar: 1989–1991 相似文献
939.
M. J. Medina Hernández S. Sagrado Vives M. C. García Alvarez-Coque 《Mikrochimica acta》1992,108(3-6):293-298
Automation by flow injection analysis with Spectrophotometric detection of the determination of total amino acids and proteins witho-phthalaldehyde is not straightforward. The use of spectrophotometry, instead of spectrofluorimetry, and of N-acetyl-L-cysteine, instead of the conventional mercaptoethanol is advantageous because of the lower variability of absorptivities with respect to fluorescence yields, and the larger stability of the derivatives. Under adequate working conditions and with leucine as reference, the procedure can be used for the evaluation of total amino acids. A similar procedure is proposed for the analysis of proteins in a sample. Limits of detection are 1 × 10–5
M for amino acids, and 1 × 10–6
M for proteins, respectively. 相似文献
940.
The electrochemical phase isolation (EPI) is described as a preparation method for determining specific precipitations in solid materials in microamounts and microdimensions. Fundamental criteria are examined as a function of the main parameter (polarization current) on the system Fe3C in a Fe-matrix. The influence of the electrolyte composition on the electrochemical behaviour of the matrix, on the one hand, and of the phase, on the other hand, are investigated and utilized. 相似文献