全文获取类型
收费全文 | 988篇 |
免费 | 32篇 |
国内免费 | 16篇 |
专业分类
化学 | 678篇 |
晶体学 | 5篇 |
力学 | 38篇 |
数学 | 82篇 |
物理学 | 233篇 |
出版年
2022年 | 7篇 |
2021年 | 12篇 |
2020年 | 9篇 |
2019年 | 12篇 |
2017年 | 12篇 |
2016年 | 18篇 |
2015年 | 17篇 |
2014年 | 17篇 |
2013年 | 39篇 |
2012年 | 43篇 |
2011年 | 59篇 |
2010年 | 35篇 |
2009年 | 27篇 |
2008年 | 45篇 |
2007年 | 58篇 |
2006年 | 61篇 |
2005年 | 63篇 |
2004年 | 54篇 |
2003年 | 35篇 |
2002年 | 37篇 |
2001年 | 17篇 |
2000年 | 24篇 |
1999年 | 15篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 26篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 23篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 12篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 8篇 |
1978年 | 10篇 |
1977年 | 13篇 |
1976年 | 5篇 |
1975年 | 10篇 |
1974年 | 12篇 |
1973年 | 9篇 |
1972年 | 5篇 |
1966年 | 5篇 |
排序方式: 共有1036条查询结果,搜索用时 15 毫秒
71.
Armstrong GS Bendiak B 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2005,174(1):163-170
A new way to apply the filter diagonalization method (FDM) that results in a large increase in the speed of calculation of multidimensional NMR spectra is presented. The speed increase is accompanied by slight differences in spectral lineshapes, although frequency estimates remain essentially identical. For contoured spectra, the method does not result in appreciable differences from the full FDM calculation. Optimal parameter sets for an FDM calculation can be estimated far more rapidly, which makes the FDM more straightforward to employ in practice. The performance of the method versus the full FDM was investigated for both model and experimental signals. The effect of noise on the method was also studied. 相似文献
72.
Armstrong GS Mandelshtam VA Shaka AJ Bendiak B 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2005,173(1):160-168
Four-dimensional nuclear magnetic resonance spectroscopy with high resolution of signals in the indirect dimensions is reported as an implementation of the filter diagonalization method (FDM). Using an oligosaccharide derivatized with 13C-labeled acetyl isotags, a four-dimensional constant-time pulse sequence was tailored for conjoint use with the FDM. Results demonstrate that high resolution in all dimensions can be achieved using a relatively short experimental time period (19 h), even though the spectrum is highly congested in the direct and all three indirect dimensions. The combined use of isotags, constant-time pulse sequences, and FDM permits rapid isolation of sugar ring proton spin systems in multiple dimensions and enables all endocyclic J-couplings to be simply measured, the key goal to assigning sugar stereochemistry and anomeric configuration. A general method for rapid, unambiguous elucidation of spin systems in oligosaccharides has been a long-sought goal of carbohydrate NMR, and isotags combined with the FDM now enable this to be easily performed. Additional general advantages of the FDM program for generating high-resolution 2D slices in any dimension from a 4D spectrum are emphasized. 相似文献
73.
74.
75.
Lennard?P?NilesEmail author Kristen?J?Armstrong Lyda?M?Rincón Castro Chung?V?Dao Rohita?Sharma Catherine?R?McMillan Laurie?C?Doering David?L?Kirkham 《BMC neuroscience》2004,5(1):41
Background
In order to optimize the potential benefits of neural stem cell (NSC) transplantation for the treatment of neurodegenerative disorders, it is necessary to understand their biological characteristics. Although neurotrophin transduction strategies are promising, alternative approaches such as the modulation of intrinsic neurotrophin expression by NSCs, could also be beneficial. Therefore, utilizing the C17.2 neural stem cell line, we have examined the expression of selected neurotrophic factors under different in vitro conditions. In view of recent evidence suggesting a role for the pineal hormone melatonin in vertebrate development, it was also of interest to determine whether its G protein-coupled MT1 and MT2 receptors are expressed in NSCs. 相似文献76.
Andrikopoulos PC Armstrong DR Clegg W Gilfillan CJ Hevia E Kennedy AR Mulvey RE O'Hara CT Parkinson JA Tooke DM 《Journal of the American Chemical Society》2004,126(37):11612-11620
Subjecting ferrocene, ruthenocene, or osmocene to the synergic amide base sodium-magnesium tris(diisopropylamido) affords a unique homologous series of metallocene derivatives of general formula [(M(C(5)H(3))(2))Na(4)Mg(4)(i-Pr(2)N)(8)] (where M = Fe (1), Ru (2), or Os (3)). X-ray crystallographic studies of 1-3 reveal a common molecular "inverse crown" structure comprising a 16-membered [(NaNMgN)(4)](4+) "host" ring and a metallocenetetraide [M(C(5)H(3))(2)](4-) "guest" core, the cleaved protons of which are lost selectively from the 1, 1', 3, and 3'-positions. Variable-temperature NMR spectroscopic studies indicate that 1, 2, and 3 each exist as two distinct interconverting conformers in arene solution, the rates of exchange of which have been calculated using coalescence and EXSY NMR measurements. 相似文献
77.
Battaglieri M Brunoldi M De Vita R Laget JM Osipenko M Ripani M Taiuti M Adams G Amaryan MJ Anciant E Anghinolfi M Armstrong DS Asavapibhop B Asryan G Audit G Auger T Avakian H Barrow S Beard K Bektasoglu M Berman BL Bersani A Bianchi N Biselli AS Boiarinov S Bouchigny S Bradford R Branford D Briscoe WJ Brooks WK Burkert VD Calarco JR Capitani GP Carman DS Carnahan B Cazes A Cetina C Cole PL Coleman A Cords D Corvisiero P Crabb D Crannell H Cummings JP DeSanctis E Degtyarenko PV Demirchyan R 《Physical review letters》2003,90(2):022002
The differential cross section, dsigma/dt, for omega meson exclusive photoproduction on the proton above the resonance region (2.6相似文献
78.
This Letter presents the results of a series of measurements of the Newtonian gravitational constant G using the compensated torsion balance developed at the Measurement Standards Laboratory. Since our last published result using the torsion balance in the compensated mode of operation [Meas. Sci. Technol. 10, 439 (1999)]], several improvements have been made to reduce the uncertainty in the final result. The new measurements have used both stainless steel and copper large masses. The values of G for the two sets of masses are in good agreement. After combining all of the measurements we get a value of G=6.673 87(0.000 27) x 10(-11) m3 kg(-1) s(-2). This new value is 5 parts in 10(5) smaller than our previous published values. 相似文献
79.
Armstrong GS Chen J Cano KE Shaka AJ Mandelshtam VA 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2003,164(1):136-144
The regularized resolvent transform (RRT) has been applied in a novel way to J-resolved spectra. This involves the direct calculation of the 45 degrees projection without constructing the 2D spectrum. The results show a significant resolution enhancement over that obtained by the 45 degrees projection of a 2D Fourier spectrum, even for much larger signals. In particular, RRT is able to resolve peaks that belong to different overlapping multiplets in a very crowded spectral region, where the conventional technique fails for any signal size. The resolving power of this method along with the significantly shorter signals required, make this method a powerful tool in spectral assignment. 相似文献
80.
Vincent KA Tilley GJ Quammie NC Streeter I Burgess BK Cheesman MR Armstrong FA 《Chemical communications (Cambridge, England)》2003,(20):2590-2591
Addition of an equivalent of a polyaminocarboxylate ligand (L) to a solution of a redox protein and the aqua Eu2+ ion results in the instantaneous in situ generation of a very powerful reductant Eu(II)-L that can rapidly drive an electron stoichiometrically onto a redox centre having an extremely negative reduction potential (lower than -1 V): this is exemplified by straightforward generation of the super-reduced state of the Fe-protein of nitrogenase. 相似文献