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排序方式: 共有104条查询结果,搜索用时 156 毫秒
41.
Aitala EM Amato S Anjos JC Appel JA Ashery D Banerjee S Bediaga I Blaylock G Bracker SB Burchat PR Burnstein RA Carter T Carvalho HS Copty NK Costa I Cremaldi LM Darling C Denisenko K Fernandez A Gagnon P Gerzon S Gobel C Gounder K Halling AM Herrera G Hurvits G James C Kasper PA Kwan S Langs DC Leslie J Lundberg B MayTal-Beck S Meadows B de Mello Neto JR Milburn RH de Miranda JM Napier A Nguyen A d'Oliveira AB O'Shaughnessy K Peng KC Perera LP Purohit MV Quinn B Radeztsky S Rafatian A 《Physical review letters》1996,77(12):2384-2387
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A. K. Mistry R. -D. Herzberg P. T. Greenlees P. Papadakis K. Auranen P. A. Butler D. M. Cox A. B. Garnsworthy T. Grahn K. Hauschild U. Jakobsson D. T. Joss R. Julin S. Ketelhut J. Konki M. Leino A. Lopez-Martens R. D. Page J. Pakarinen P. Peura P. Rahkila M. Sandzelius C. Scholey J. Simpson D. Seddon J. Sorri S. Stolze J. Thornhill J. Uusitalo D. Wells 《The European Physical Journal A - Hadrons and Nuclei》2017,53(2):24
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Successive oxidation of transition metal(II) aqua complexes (M(II)OH(2) to M(III)OH) is a domain in which proton-coupled electron transfer reactions are extremely common. The mechanism of these PCET reactions-concerted or stepwise-is an important issue in the understanding and design of natural or artificial systems catalyzing the formation of dioxygen by four-electron oxidation of water. Concerted proton-coupled electron transfer from an aqua metal(II) to a hydroxo metal(III) complex requires the close proximity of a proton-accepting group with a pK value between those of the aqua complexes. Otherwise, stepwise electron-proton or proton-electron pathways involving high-energy intermediates are followed. Concerted proton-electron pathways involving water as proton-acceptor or proton-donor group are inefficient. Cyclic voltammetry of the title complex in buffered aqueous solution and re-examination of previous results for the same complex attached to an electrode surface are used to establish these conclusions, which provide a starting point on the route to higher degrees of oxidation, such as those involved in the catalysis of water oxidation. 相似文献
48.
Paajanen M Katainen J Pakarinen OH Foster AS Lahtinen J 《Journal of colloid and interface science》2006,304(2):518-523
The humidity present in ambient atmosphere affects the adhesion of small particles by causing capillary bridge formation between the particle and the surface. Even in moderate relative humidities this, usually attractive, force can have a significant effect on adhesion behaviour of micro and sub-micro particles. We have directly measured the pull-off forces of initially adhered oxide particles on oxide surfaces with atomic force microscope in controlled atmosphere with adjustable humidity. We demonstrate the effect of the surface roughness resulting in two different regions of capillary formation and the particle shape having a strong effect on the humidity dependency of adhesion. The experimental results are explained by theoretical framework. 相似文献
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S. Eeckhaudt P. T. Greenlees N. Amzal J. E. Bastin E. Bouchez P. A. Butler A. Chatillon K. Eskola J. Gerl T. Grahn A. Görgen R. -D. Herzberg F. P. Hessberger A. Hürstel P. J. C. Ikin G. D. Jones P. Jones R. Julin S. Juutinen H. Kettunen T. L. Khoo W. Korten P. Kuusiniemi Y. Le Coz M. Leino A. -P. Leppänen P. Nieminen J. Pakarinen J. Perkowski A. Pritchard P. Reiter P. Rahkila C. Scholey Ch. Theisen J. Uusitalo K. Van de Vel J. Wilson 《The European Physical Journal A - Hadrons and Nuclei》2005,26(2):227-232
Evidence for the decay of non-yrast states in 254No has been observed for the first time in an experiment performed at the University of Jyv?skyl?. The experiment employed
the JUROGAM array of germanium detectors coupled to the gas-filled recoil separator RITU and the focal-plane spectrometer
GREAT. The ground-state rotational band has been tentatively extended up to a spin of 24ℏ and has a smoothly behaving dynamical
moment of inertia. It is speculated that the observation of high-energy γ-rays is due to the decay of a K = 3 band-head state. 相似文献
50.
Jaana M. H. Pakarinen Pirjo Vainiotalo 《Rapid communications in mass spectrometry : RCM》2009,23(12):1767-1775
Metal complex formation was investigated for di‐exo‐, di‐endo‐ and trans‐2,3‐ and 2,5‐disubstituted trinorbornanediols, and di‐exo‐ and di‐endo‐ 2,3‐disubstituted camphanediols using different divalent transition metals (Co2+, Ni2+, Cu2+) and electrospray ionization quadrupole ion trap mass spectrometry. Many metal‐coordinated complex ions were formed for cobalt and nickel: [2M+Met]2+, [3M+Met]2+, [M–H+Met]+, [2M–H+Met]+, [M+MetX]+, [2M+MetX]+ and [3M–H+Co]+, where M is the diol, Met is the metal used and X is the counter ion (acetate, chloride, nitrate). Copper showed the weakest formation of metal complexes with di‐exo‐2,3‐disubstituted trinorbornanediol yielding only the minor singly charged ions [M–H+Cu]+, [2M–H+Cu]+ and [2M+CuX]+. No clear differences were noted for cobalt complex formation, especially for cis‐2,3‐disubstituted isomers. However, 2,5‐disubstituted trinorbornanediols showed moderate diastereomeric differentiation because of the unidentate nature of the sterically more hindered exo‐isomer. trans‐Isomers gave rise to abundant [3M–H+Co]+ ion products, which may be considered a characteristic ion for bicyclo[221]heptane trans‐2,3‐ and trans‐2,5‐diols. To differentiate cis‐2,3‐isomers, the collision‐induced dissociation (CID) products for [3M+Co]2+, [M+CoOAc]+, [2M–H+Co]+ and [2M+CoOAc]+ cobalt complexes were investigated. The results of the CID of the monomeric and dimeric metal adduct complexes [M+CoOAc]+ and [2M–H+Co]+ were stereochemically controlled and could be used for stereochemical differentiation of the compounds investigated. In addition, the structures and relative energies of some complex ions were studied using hybrid density functional theory calculations. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献