全文获取类型
收费全文 | 148篇 |
免费 | 1篇 |
专业分类
化学 | 73篇 |
晶体学 | 1篇 |
力学 | 9篇 |
数学 | 25篇 |
物理学 | 41篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 7篇 |
2012年 | 3篇 |
2011年 | 12篇 |
2010年 | 4篇 |
2009年 | 5篇 |
2008年 | 11篇 |
2007年 | 6篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 8篇 |
2003年 | 1篇 |
2001年 | 1篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1970年 | 2篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1961年 | 1篇 |
1907年 | 2篇 |
排序方式: 共有149条查询结果,搜索用时 15 毫秒
41.
42.
Alimonti A Forte G Spezia S Gatti A Mincione G Ronchi A Bavazzano P Bocca B Minoia C 《Rapid communications in mass spectrometry : RCM》2005,19(21):3131-3138
The wide use of barium (Ba), cesium (Cs), antimony (Sb) and tungsten (W) in many industrial and agricultural fields causes the increased release of these metals into the environment, laying the basis for health risk. To assess the exposure for the general population, the development of adequate and reliable analytical techniques becomes compulsory. This study refers to the quantification of urinary Ba, Cs, Sb and W levels by both quadrupole (Q) and sector field (SF) inductively coupled plasma mass spectrometry (ICP-MS). The two procedures were compared for their performances and their measurement uncertainties. The limits of detection were (Q and SF) 23.0 and 5.21 ng L(-1) for Ba; 21.1 and 7.52 ng L(-1) for Cs; 1.09 and 0.43 ng L(-1) for Sb; and 0.36 and 0.49 ng L(-1) for W. The trueness was better than 93.3% and the precision less than 12% for both techniques. Relative expanded uncertainties of the analytical procedures, at the median levels found in the general population, were below 5% for all the elements with both ICP-MS techniques. The uncertainties related to the calibration and repeatability were the parameters most influencing the final analytical performance. The urinary median values observed in healthy subjects from central Italy were 1146, 4301, 60.8 and 48.5 ng L(-1) for Ba, Cs, Sb and W, respectively. 相似文献
43.
Solid state (13)C NMR and FT-IR spectroscopy of the cocoon silk of two common spiders 总被引:2,自引:0,他引:2
Bramanti E Catalano D Forte C Giovanneschi M Masetti M Veracini CA 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2005,62(1-3):105-111
The structure of the silk from cocoons of two common spiders, Araneus diadematus (family Araneidae) and Achaearanea tepidariorum (family Theridiidae) was investigated by means of (13)C solid state NMR and FT-IR spectroscopies. The combined use of these two techniques allowed us to highlight differences in the two samples. The cocoon silk of Achaearanea tepidariorum is essentially constituted by helical and beta-sheet structures, whereas that of Araneus diadematus shows a more complex structure, containing also beta-strands and beta-turns. Moreover, the former silk is essentially crystalline while the latter contains more mobile domains. The structural differences of the two cocoon silks are ascribed to the different habitat of the two species. 相似文献
44.
Sunto Nell'ambito della teoria dell'informazione senza probabilità, si propone una definizione assiomatica dell'informazione associata
ad esperienze incomplete.
Si discutono in particolare le proprietà del guadagno di informazione e dell'informazione condizionale, giungendo a caratterizzare
con un sistema di equazioni funzionali la classe delle misure di informazione che soddisfano agli assiomi adottati; come caso
particolare si ottiene la classica misura di Shannon-Rényi.
Lavoro eseguito per la realizzazione del programma del gruppo di ricerca n. 7 del C. N. R. 相似文献
45.
Bruno Forte 《Annali di Matematica Pura ed Applicata》1961,56(1):263-279
Lavoro eseguito per la realizzazione del programma del gruppo di ricerca n. 20 del C.N.R. (1960–61). 相似文献
46.
Aequationes mathematicae - 相似文献
47.
Harmonic and Cartan decompositions are used to prove that there are eight symmetry classes of elasticity tensors. Recent results in apparent contradiction with this conclusion are discussed in a short history of the problem.Research supported by GNFM of CNR (Italy) 相似文献
48.
Mattia Scardamaglia Giuseppe Forte Silvano Lizzit Alessandro Baraldi Paolo Lacovig Rosanna Larciprete Carlo Mariani Maria Grazia Betti 《Journal of nanoparticle research》2011,13(11):6013-6020
Iron-phthalocyanine (FePc) molecules have been adsorbed on a graphene sheet prepared on the Ir(111) surface. The FePc molecules
are flat-lying on graphene, as determined by near-edge X-ray absorption fine-structure, constituting a sub-nanometer thick
molecular array at the single-layer coverage. The flat FePc single-layer presents a weak interaction of the organic macrocycle
with the graphene surface and Ir subsurface substrate. Further FePc deposition on top of the first flat single-layer determines
a three-dimensional island growth with varying molecular orientation. 相似文献
49.
Grochau Inês Hexsel Caten Carla Schwengber ten de Camargo Forte Maria Madalena 《Accreditation and quality assurance》2018,23(4):255-255
Accreditation and Quality Assurance - Unfortunately, figure 3 was incorrectly published in the original publication and the correct version is updated here. 相似文献
50.
Crystallization kinetics and morphology of poly(lactic acid) with polysaccharide as nucleating agent
Dartora Paula Cristina da Rosa Loureiro Mariane de Camargo Forte Maria Madalena 《Journal of Thermal Analysis and Calorimetry》2018,134(3):1705-1713
Journal of Thermal Analysis and Calorimetry - An ever-increasing concern about environmental pollution has spearheaded research into alternative biodegradable polymers. Currently, poly(lactic acid)... 相似文献