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141.
C N Davids P J Woods D Seweryniak A A Sonzogni J C Batchelder C R Bingham T Davinson D J Henderson R J Irvine G L Poli J Uusitalo W B Walters 《Pramana》1999,53(3):631
The proton drip line defines one of the fundamental limits to nuclear stability. Nuclei lying beyond this line are energetically
unbound to the emission of a constituent proton from their ground states.
For near-spherical nuclei in the region of the drip line between Z=69 (Tm) and Z=81 (T1), proton decay transition rates have been shown to be well reproduced by WKB calculations using spectroscopic factors
derived from a low-seniority shell model calculation [2]. Another approach using spectroscopic factors obtained from the independent
quasiparticle approximation has also proved successful in this region [3]. These interpretations have allowed the extraction
of nuclear structure information from nuclei well beyond the proton drip line.
The rare-earth proton emitters 141Ho and 131Eu have recently been observed [4], and their decay rates can only be explained by assuming large deformation for these nuclei.
In addition to providing information on the wavefunctions and deformations of these nuclei, these results offer the opportunity
to study the phenomenon of quantum mechanical tunneling through a deformed potential barrier.
Work supported by the U.S. Department of Energy, Nuclear Physics Division, under contract W-31-109-ENG-38. 相似文献
142.
William T.M. Irvine 《Comptes Rendus Mecanique》2018,346(3):170-174
This contribution to an issue of Comptes rendus Mécanique, commemorating the scientific work of Jean-Jacques Moreau (1923–2014), is intended to give a brief overview of recent developments in the study of helicity dynamics in real fluids and an outlook on the growing legacy of Moreau's work. Moreau's discovery of the conservation of hydrodynamic helicity, presented in an article in the Comptes rendus de l'Académie des sciences in 1961, was not recognized until long after it was published. This seminal contribution is gaining a new life now that modern developments allow the study of helicity and topology in fields and is having a growing impact on diverse areas of physics. 相似文献
143.
A mathematical model is proposed for the process of vacuum superplasticforming. The model exploits the fact that in most industrialapplications the sheet aspect ratio (thickness/sheet width)is small. After an initial consideration of some of the moregeneral properties and the literature of superplastic materials,the elastic/plastic deformation of an internally-inflated thin-walledcylinder is examined. Plates of arbitrary geometry are thenconsidered. A quasisteady model in which the sheet moves througha sequence of steady states is developed. Some simplified closed-formsolutions are examined, but for general cases a system of nonlinearpartial differential equations must be solved numerically. Anefficient and accurate semi-explicit numerical scheme is proposedand a simplified stability analysis is presented; the methodis then used to compute properties of superplastic vacuum mouldedsheets in a number of practically motivated cases. 相似文献
144.
145.
Formation of oxidative and non‐oxidative dimers in metallothioneins: Implications for charge‐state analysis for structural determination
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148.
Dickens JE Irvine WM Nummelin A Møllendal H Saito S Thorwirth S Hjalmarson A Ohishi M 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2001,57(4):643-660
Rotational spectroscopy at millimeter wavelengths is a powerful means of investigating the chemistry of dense interstellar clouds. These regions can exhibit an interesting complement of gas phase molecules, including relatively complex organics. Here we report the tentative first astronomical detection of aziridine (ethylenimine), the possible detection of propenal (acrolein), and upper limits on the abundances of cyclopropenone, furan, hydroxyethanal (glycolaldehyde), thiohydroxylamine (NH2SH), and ethenol (vinyl alcohol) in various interstellar clouds. 相似文献
149.
The structures of 4-hydroxy-3,5,6-trichloropyridine-2-carboxylic acid (1a) and 6-hydroxy-3,4,5-trichloro-2-carboxylic acid (1b) were verified by the NMR analysis of their corresponding methylated and decarboxylated derivatives 2,3,5-trichloro-4-methoxypyridine (5) and 3,4,5-trichloro-2-methoxypyridine (8), respectively. The 6-hydroxy isomer (1a) was found to be in equilibrium with its pyridinone tautomer as evidenced by the formation of significant amounts of 3,4,5-trichloro-1-methyl-6-oxo-1,6-dihydropyridine-2-carboxylic acid methyl ester (6b) on exhaustive methylation. The one-bond chlorine-isotope effect was used and shown to be an effective tool for the identification of chlorinated carbons in (13)C NMR spectra providing an additional tool for solving structural problems in chlorinated compounds. 相似文献
150.
Brown JA Irvine S Kennedy AR Kerr WJ Andersson S Nilsson GN 《Chemical communications (Cambridge, England)》2008,(9):1115-1117
Practically convenient methods have been developed for the preparation of new iridium complexes, possessing bulky N-heterocyclic carbene and phosphine ligands; these routinely handled complexes are highly active catalysts within directed hydrogen isotope exchange processes. 相似文献