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31.
Pieter Cools Nathalie De Geyter Els Vanderleyden Peter Dubruel Rino Morent 《Plasma Chemistry and Plasma Processing》2014,34(4):917-932
A medium pressure (5 kPa) dielectric barrier discharge operating in different atmospheres (air and argon) is used to develop a fast and easy way to remove adsorbed carbon contamination. Chemical and physical changes at the sample surface after plasma treatment are studied, making use of contact angle measurements, X-ray photoelectron spectroscopy analysis and atomic force microscopy measurements. The obtained results are compared with other chemical and thermal treatments typically used. This comparison shows that plasma treatment at medium pressure is able to remove up to 20 % more of the adsorbed carbon compared to the classical cleaning methods, while at the same time being less aggressive, leaving the sub-surface chemistry unchanged. Moreover, the analysis techniques give a fundamental insight in the reactions processes at the titanium surface when exposed to a medium pressure plasma. 相似文献
32.
Rino Falcone Cristiano Castelfranchi 《Computational & Mathematical Organization Theory》2011,17(2):179-195
Trust can be viewed at the same time as an instrument both for an agent selecting the right partners in order to achieve its
own goals, and for an agent of being selected from other potential partners in order to establish with them a cooperation/collaboration
and to take advantage from the accumulated trust. In this paper we will analyze trust as the agents’ relational capital. Starting from the classical dependence network with potential partners, we introduce the analysis of what it means for an
agent to be trusted and how this condition could be strategically used from it for achieving its own goals, that is, why it
represents a form of power. The idea of taking another agent’s point of view is especially important if we consider the amount
of studies in social science that connect trust with social capital related issues. Although there is a big interest in literature about ‘social capital’ and its powerful effects on the wellbeing
of both societies and individuals, often it is not clear enough what is it the object under analysis. Individual trust capital
(relational capital) and collective trust capital not only should be disentangled, but their relations are quite complicated
and even conflicting. To overcome this gap, we propose a study that first attempts to understand what trust is as capital of individuals. In which sense “trust” is a capital. How this capital is built, managed and saved. In particular, how this capital is the
result of the others’ beliefs and goals. Then we aim to analytically study the cognitive dynamics of this object. 相似文献
33.
34.
Bencivenni G Lanza T Leardini R Minozzi M Nanni D Spagnolo P Zanardi G 《The Journal of organic chemistry》2008,73(12):4721-4724
The radical reaction of tributyltin hydride with o-iodo- N-methylanilides derived from alpha-azido acids provides an excellent access to alpha-(aminocarbonyl)iminyl radicals through 1,5-hydrogen transfer reaction of initially formed aryl radicals followed by beta-elimination of dinitrogen from ensuing alpha-azido-alpha-(aminocarbonyl)alkyl radicals. The outcoming iminyls display a peculiar tendency to form corresponding nitriles by beta-elimination of aminocarbonyl radicals. 相似文献
35.
T Nagano A Iimuro R Schwenk T Ohshima Y Kita A Togni K Mashima 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(37):11578-11592
The additive effects of amines were realized in the asymmetric hydrogenation of 2-phenylquinoxaline, and its derivatives, catalyzed by chiral cationic dinuclear triply halide-bridged iridium complexes [{Ir(H)[diphosphine]}(2) (μ-X)(3) ]X (diphosphine=(S)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl [(S)-BINAP], (S)-5,5'-bis(diphenylphosphino)-4,4'-bi-1,3-benzodioxole [(S)-SEGPHOS], (S)-5,5'-bis(diphenylphosphino)-2,2,2',2'-tetrafluoro-4,4'-bi-1,3-benzodioxole [(S)-DIFLUORPHOS]; X=Cl, Br, I) to produce the corresponding 2-aryl-1,2,3,4-tetrahydroquinoxalines. The additive effects of amines were investigated by solution dynamics studies of iridium complexes in the presence of N-methyl-p-anisidine (MPA), which was determined to be the best amine additive for achievement of a high enantioselectivity of (S)-2-phenyl-1,2,3,4-tetrahydroquinoxaline, and by labeling experiments, which revealed a plausible mechanism comprised of two cycles. One catalytic cycle was less active and less enantioselective; it involved the substrate-coordinated mononuclear complex [IrHCl(2) (2-phenylquinoxaline){(S)-BINAP}], which afforded half-reduced product 3-phenyl-1,2-dihydroquinoxaline. A poorly enantioselective disproportionation of this half-reduced product afforded (S)-2-phenyl-1,2,3,4-tetrahydroquinoxaline. The other cycle involved a more active hydride-amide catalyst, derived from amine-coordinated mononuclear complex [IrCl(2) H(MPA){(S)-BINAP}], which functioned to reduce 2-phenylquinoxaline to (S)-2-phenyl-1,2,3,4-tetrahydroquinoxaline with high enantioselectivity. Based on the proposed mechanism, an Ir(I) -JOSIPHOS (JOSIPHOS=(R)-1-[(S(p) )-2-(dicyclohexylphosphino)ferrocenylethyl]diphenylphosphine) catalyst in the presence of amine additive resulted in the highest enantioselectivity for the asymmetric hydrogenation of 2-phenylquinoxaline. Interestingly, the reaction rate and enantioselectivity were gradually increased during the reaction by a positive-feedback effect from the product amines. 相似文献
36.
F. D. Rodrigues M. Cunha L. Hilliou L. Rino M. R. Correia T. Busani G. Bernardo H. Wiggers S. A. Filonovich R. N. Pereira 《Applied Physics A: Materials Science & Processing》2013,113(2):439-446
Blends of Si nanocrystals (Si-NCs) and organic semiconductors are promising materials for new optical and electronic devices processed from solutions. Here, we study how the optical properties of composite films containing Si-NCs and the organic semiconductor poly(3-hexylthiophene) (P3HT) are influenced by the composition and morphology resulting from different solution-processing parameters and different solvents used dichlorobenzene vs. chloroform). The optical spectra of the hybrid films are described using a simple phenomenological model, with which we can discern the contribution of each material in the films to the optical properties. From this analysis, we obtain quantitative information about the composition and morphology of the hybrid nanostructured films, which otherwise would be obtained from more demanding microscopy and spectroscopy techniques. For the case of the Si-NC/P3HT blend, we find that in films deposited from dichlorobenzene solutions the Si-NCs contribute sizably to light absorption. 相似文献
37.
L Silvestri F Ballante A Mai GR Marshall R Ragno 《Journal of chemical information and modeling》2012,52(8):2215-2235
An enhanced version of comparative binding energy (COMBINE) analysis, named COMBINEr, based on both ligand-based and structure-based alignments has been used to build several 3-D QSAR models for the eleven human zinc-based histone deacetylases (HDACs). When faced with an abundance of data from diverse structure-activity sources, choosing the best paradigm for an integrative analysis is difficult. A common example from studies on enzyme-inhibitors is the abundance of crystal structures characterized by diverse ligands complexed with different enzyme isoforms. A novel comprehensive tool for data mining on such inhomogeneous set of structure-activity data was developed based on the original approach of Ortiz, Gago, and Wade, and applied to predict HDAC inhibitors' isoform selectivity. The COMBINEr approach (apart from the AMBER programs) has been developed to use only software freely available to academics. 相似文献
38.
39.
Rino Morent Nathalie De Geyter Sandra Van Vlierberghe Els Vanderleyden Peter Dubruel Christophe Leys Etienne Schacht 《Plasma Chemistry and Plasma Processing》2009,29(2):103-117
The present work describes the plasma polymerisation of acrylic acid at atmospheric pressure. The influence of two operating
parameters (monomer concentration and discharge power) on the properties of the deposited films is investigated. Results show
that at a monomer concentration of 2.5 ppm and a discharge power of 9.5 W, the monomer is only slightly fragmented leading
to a high amount of carboxylic acid groups on the deposited films. In contrast, when monomer concentration is decreased or
discharge power increased, the incidence of monomer fragmentation processes is higher, leading to a lower amount of carboxylic
acid groups on the films. This behaviour can be explained by a higher energy amount available per monomer molecule at low
monomer concentrations and high discharge powers and a higher flux of positive ions attacking the surface at high discharge
powers. Taking into account these results, it can be concluded that the deposition parameters should be carefully selected
in order to preserve the stability of the monomer and thus obtain coatings with high carboxylic acid densities. 相似文献
40.
Van Deynse Annick Leys Christophe Morent Rino De Geyter Nathalie 《Plasma Chemistry and Plasma Processing》2019,39(5):1317-1342
Plasma Chemistry and Plasma Processing - Plasma polymerization experiments are typically conducted by sustaining a non-thermal plasma in a gas flow containing monomer molecules. Recently, it was... 相似文献