全文获取类型
收费全文 | 19627篇 |
免费 | 1580篇 |
国内免费 | 3807篇 |
专业分类
化学 | 18234篇 |
晶体学 | 282篇 |
力学 | 786篇 |
综合类 | 351篇 |
数学 | 822篇 |
物理学 | 4539篇 |
出版年
2024年 | 113篇 |
2023年 | 565篇 |
2022年 | 575篇 |
2021年 | 619篇 |
2020年 | 490篇 |
2019年 | 771篇 |
2018年 | 468篇 |
2017年 | 668篇 |
2016年 | 681篇 |
2015年 | 773篇 |
2014年 | 1325篇 |
2013年 | 1155篇 |
2012年 | 1250篇 |
2011年 | 1282篇 |
2010年 | 1211篇 |
2009年 | 1269篇 |
2008年 | 1335篇 |
2007年 | 1152篇 |
2006年 | 1090篇 |
2005年 | 1011篇 |
2004年 | 956篇 |
2003年 | 777篇 |
2002年 | 711篇 |
2001年 | 611篇 |
2000年 | 458篇 |
1999年 | 489篇 |
1998年 | 430篇 |
1997年 | 435篇 |
1996年 | 404篇 |
1995年 | 374篇 |
1994年 | 348篇 |
1993年 | 249篇 |
1992年 | 237篇 |
1991年 | 216篇 |
1990年 | 178篇 |
1989年 | 192篇 |
1988年 | 45篇 |
1987年 | 30篇 |
1986年 | 21篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 12篇 |
1982年 | 10篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1959年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 123 毫秒
991.
改进的微波辅助无溶剂法提取薄荷和陈皮中的挥发油组分 总被引:1,自引:0,他引:1
An improved solvent free microwave extraction, in which a kind of microwave absorption medium (carbonyl iron powder) was used, was applied to the extraction of essential oil from dried menthol mint and orange peel without addition of any solvent and pretreatment. It took much less time of extraction (30 min) than microwave-assisted hydrodistillation (90 min) and conventional hydrodistillation (180 min). The kinds of chemical compositions in essential oil extracted by different methods were almost the same and such improved solvent free microwave extraction can be a feasible way in extraction of essential oil from dried plant materials. 相似文献
992.
Study on the extraction and separation of rare earth with new extractants is important in the rare earth chemistry and nuclear reprocessing. In this work, the extraction of Ce(Ⅲ) with N,N,N′,N′-tetrabutylmalonamide (TBMA) in toluene from nitrate media has been investigated. The effect of the concentration of nitric acid, TBMA and salt-ing-out agent (LiNO3) and also the temperature on the distribution ratios was examined. The stoichiometries of the extracted complexes were determined to be Ce(NO3)3·3TBMA and Ce(NO3)3·4TBMA, respectively. The ap-parent extraction constants and the enthalpy of the extraction were calculated based on the extraction data, which are logKex1=3.97, logKex2=4.75 and ΔrHm?=-31.25kJ·mol-1, respectively. The IR spectra of the loaded organic phase supported the suggested extraction mechanism. 相似文献
993.
Ali MOGHIMI Mohammad SABER‐TEHRANI Syed WAQIF‐HUSAIN Majid MOHAMMADHOSSEINI 《中国化学》2007,25(12):1859-1865
A novel and selective method for the fast determination of trace amounts of chromium species in water samples has been developed. The procedure is based on the selective formation of chromium diethyldithiocarbamate complexes at different pH in the presence of Mn(II) as an enhancement agent of chromium signals followed by elution with organic eluents and determination by atomic flame absorption spectrometry. The maximum capacity of the employed disks was found to be (396±3) µg and (376±2) µg for Cr(III) and Cr(VI), respectively. The detection limit of the proposed method is 49 and 43 ng·L?1 for Cr(III) and Cr(VI), respectively. The proposed method was successfully applied for determination of chromium species Cr(III) and Cr(VI) in different water samples. 相似文献
994.
Ya Wen TANG Shuang CAO Ling Ling ZHANG Jian Chun BAO Ping ZHOU Tian Hong LU 《中国化学快报》2006,17(12):1623-1626
The performance of the direct formic acid fuel cell (DFAFC) is considerably higher than the direct methanol fuel cell (DMFC) because of some characteristics of formic acid1. For example, formic acid is non-toxic. Formic acid has two orders of magnitude smaller crossover flux through a Nafion membrane than methanol2. In DFAFC, the concentration of formic acid can be as high as 20 mol/L, while the best concentration of methanol in DMFC is only about 2 mol/L3. Thus, the power density of … 相似文献
995.
采用双柱、双泵和双阀,通过住切换技术对尿中的香草扁桃酸(VMA)进行直接进样分离,并用电化学检测器检测。样品先进入柱Ⅰ,初步分离后,包含VMA的组分被切换入柱Ⅱ进一步分离。结果显示,此法操作简单、快速,回收率高,重复性好。 相似文献
996.
997.
998.
建立了分散固相萃取净化-超高效液相色谱-串联质谱法快速测定鱼和虾中3类(磺胺类、喹诺酮类、氯霉素类)18种抗生素及2种三苯甲烷类(孔雀石绿、隐色孔雀石绿)兽药残留。样品经磷酸氢二钾溶液水解分散,乙腈提取,提取液经氯化钠脱水、盐析后取乙腈层,经旋转蒸发仪浓缩至近干,残留物用甲醇定容至1.0 mL,C18和PSA(N-丙基乙二胺)填料分散固相萃取净化,过滤膜后经ZORBAX C18色谱柱(50 mm×2.1 mm,1.8 μm)分离,正、负离子多反应监测模式采集数据,同位素内标法定量。实验结果表明,20种兽药在0.2~300 μg/L范围内具有良好的线性关系,检出限为0.1~0.6 μg/kg,定量限为0.3~1.8 μg/kg,相关系数均大于0.99。在1、5和20倍定量限加标浓度水平下,平均回收率为72.5%~118%,相对标准偏差(RSD)为1.9%~9.8%。该方法具有前处理简单、检测效率高、成本低等优点,适用于鱼和虾中多类兽药残留的同时测定。 相似文献
999.
YingXinLIU ZuoJunWEI JiXiangCHEN JiYanZHANG XinXueLI XiongHuiWEI 《中国化学快报》2005,16(4):531-533
A novel lanthana-promoted nickel catalyst supported on silica for the liquid phase hydrogenation of m-dinitrobenzene to m-phenylenediamine was prepared by an incipient wetness sequential impregnation method. It was found that Ni-La/SiO2 catalyst exhibited high activity and stability for m-dinitrobenzene hydrogenation. Over this catalyst, the conversion of m-dinitrobenzene and the yield of m-phenylenediamine were up to 97.1% and 93.5%, respectively,at 373 K and 2.6 MPa hydrogen pressure after reaction for 1 h. 相似文献
1000.
Twenty common amino acids have been analyzed successfully by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using carbon nanotubes as matrix. From the spectra, little or no background interference or fragmentation of the analytes has been observed. This method was also applied to the analysis of amino acid mixture successfully. Carbon nanotubes have some features such as large surface area to disperse the analyte molecules sufficiently and prevent the sample aggregation and strong ultraviolet absorption to transfer energy easily to the analyte molecules. The present method has potential application for the rapid and sensitive analysis of amino acids and their mixture. 相似文献