全文获取类型
收费全文 | 359篇 |
免费 | 8篇 |
国内免费 | 4篇 |
专业分类
化学 | 239篇 |
晶体学 | 3篇 |
力学 | 6篇 |
数学 | 68篇 |
物理学 | 55篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 10篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 7篇 |
2016年 | 9篇 |
2015年 | 14篇 |
2014年 | 9篇 |
2013年 | 20篇 |
2012年 | 25篇 |
2011年 | 26篇 |
2010年 | 18篇 |
2009年 | 14篇 |
2008年 | 23篇 |
2007年 | 20篇 |
2006年 | 11篇 |
2005年 | 15篇 |
2004年 | 20篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1981年 | 3篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1964年 | 1篇 |
1941年 | 2篇 |
1933年 | 1篇 |
1932年 | 3篇 |
1931年 | 2篇 |
1926年 | 1篇 |
1918年 | 1篇 |
1917年 | 1篇 |
1912年 | 2篇 |
1911年 | 2篇 |
1901年 | 3篇 |
1900年 | 3篇 |
1898年 | 2篇 |
1897年 | 1篇 |
1884年 | 1篇 |
排序方式: 共有371条查询结果,搜索用时 15 毫秒
291.
Adsorption of Cadmium on Titanium Dioxide Nanoparticles in Freshwater Conditions – A Chemodynamic Study 下载免费PDF全文
Gonçalo Vale Cristiana Franco Anna M. Brunnert Margarida M. Correia dos Santos 《Electroanalysis》2015,27(10):2439-2447
The adsorption of Cd onto two titanium dioxide nanoparticles (nTiO2) with distinct crystalline phases and sizes was investigated in conditions that can be found in freshwater systems (I=0.01 M, pH 6.0–8.5). Cd dynamic speciation was assessed by two distinct electroanalytical techniques: absence of gradients and nernstian equilibrium stripping (AGNES) and scanned stripping chronopotentiometry (SSCP). With both NPs, 1 : 1 CdTiO2 homogeneous and labile surface complexes are formed. To our knowledge this is the first study about the dynamic nature of the nTiO2 surface complexes formed in the presence of Cd. 相似文献
292.
M. Agostinha R. Matos Margarida S. Miranda Victor M. F. Morais Joel F. Liebman 《Molecular physics》2013,111(12):1833-1841
The standard molar enthalpy of formation in the gas phase of 2H-1,4-benzoxazin-3(4H)-one was derived from the standard energy of combustion determined by static bomb combustion calorimetry in oxygen atmosphere and from the standard sublimation enthalpy determined by Calvet microcalorimetry. In addition, we report the results of a systematic theoretical study of the keto and enol tautomers in benzoxazinones and diones using density functional theory. The keto tautomers are computed to be more stable than the enols. Tautomerization energies are reported. 相似文献
293.
Waller K. Dieterich R. Henriques und D. Holde 《Fresenius' Journal of Analytical Chemistry》1901,40(6):428-429
Ohne Zusammenfassung 相似文献
294.
A. C. Geitel R. Benedikt J. Lewkowitsch R. Henriques P. Duffy J. Bouis W. Fox J. A. Wanklyn und W. Fahrion 《Fresenius' Journal of Analytical Chemistry》1900,39(1):68-72
Ohne Zusammenfassung 相似文献
295.
M.L. Afonso R.A.L. Silva M. Matos E.B. Lopes J.T. Coutinho L.C.J. Pereira R.T. Henriques M. Almeida 《Journal of Crystal Growth》2012,340(1):56-60
The conditions for the growth of (Perylene)2 [Pd(mnt)2] crystals either by chemical oxidation and electrochemical routes are described. The electrocrystallisation is limited by close proximity of the oxidation potentials of the perylene donor and [Pd(mnt)2]? anion, and depending on the experimental conditions different morphologies can be obtained. (Per)2 [Pd(mnt)2] crystals obtained by elecrocrystallisation were found to be mainly of the β-polymorph with properties comparable to the Cu, Ni and Pt analogues previously described at variance with those obtained by chemical oxidation which are mainly of the α-polymorph . 相似文献
296.
H. Burstin E. Katz E. H. Kadmer A. v. Philippovich A. Graf H. G. Botset I. I. Starosstin I. M. Abesgaus I. Blum D. S. McKittrick H. J. Henriques H. I. Wolff A. W. Trusty J. A. Eminow N. I. Plachuta L. L. Lanzewitzkaja E. Casirnir N. Dimitriu V. Sala und J. Mühlbauer 《Fresenius' Journal of Analytical Chemistry》1941,121(1-2):65-70
Ohne Zusammenfassung 相似文献
297.
E. Cherbuliez Pl. Plattner S. Ariel R. Wahl Muhlemann E. Abderhalden P. Karrer W. Karrer H. Thomann E. Horlacher W. Mäder S. L. Jodidi V. Henriques S. P. L. Sörensen J. Tillmans P. Hirsch F. Stoppel L. Michaelis H. Bauer E. Strauss C. J. Weber und J. Froideveaux 《Fresenius' Journal of Analytical Chemistry》1932,87(3-4):142-147
Ohne Zusammenfassung 相似文献
298.
299.
Maria da Conceição Costa Pereira Tufic Madi Filho Margarida Mizue Hamada 《辐射效应与固体损伤》2013,168(12):921-928
Scintillation crystals have been used in various fields, such as high energy physics, nuclear instrumentation, radiation measurements, medical imaging, nuclear tomography, astrophysics and other fields of science and engineering. For these applications, the development of scintillation crystals with good performance is required. Scintillation crystals based on cesium iodide (CsI) matrix are matters with relatively low hygroscopicity, easy to handle and of low cost, characteristics that favor their use as radiation detectors. In this study, pure CsI crystal and lead doped CsI crystals were grown using the Bridgman vertical technique. The concentration of the lead doping element (Pb) was studied in the range of 10?2 to 5×10?4 M. The distribution of the doping element in the crystalline volume was determined by atomic absorption technique. The CsI:Pb crystal with nominal concentration of 10?3 M was cut into 14 slices of 6 mm. The results show a higher concentration at the top of the crystal with a decrease in the initial phase of growth. The dopant concentration of Pb showed good uniformity from the slice 2 to the slice 12: the region is, therefore, suitable for use as a radiation detector. The luminescence emission of these crystals was measured. A predominant luminescence band near 450 nm and a single broad band around 320 nm were found with the addition of the Pb2+ ions in the CsI matrix. Alpha particles spectrometry measurements were carried out to evaluate the developed scintillators.The resolution of 5.6% was obtained for the CsI:Pb 5×10?4 M crystal, when excited with alpha particles from a 241Am source, with energy of 5.54 MeV. 相似文献
300.