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51.
52.
In Situ Small‐Angle X‐ray Scattering Investigation of the Formation of Dual‐Mesoporous Materials 下载免费PDF全文
Dr. Julien Schmitt Dr. Nadia Canilho Dr. Marianne Impéror‐Clerc Prof. Jean‐Luc Blin Dr. Jan Skov Pedersen Dr. Javier Pérez Dr. Bénédicte Lebeau Dr. Loic Vidal Dr. Marie‐José Stébé 《Chemphyschem》2015,16(17):3637-3641
The formation of a 2D‐hexagonal (p6m) silica‐based hybrid dual‐mesoporous material is investigated in situ by using synchrotron time‐resolved small‐angle X‐ray scattering (SAXS). The material is synthesized from a mixed micellar solution of a nonionic fluorinated surfactant, RF8(EO)9 (EO=ethylene oxide) and a nonionic triblock copolymer, P123. Both mesoporous networks, with pore dimensions of 3.3 and 8.5 nm respectively, are observed by nitrogen sorption, transmission electron microscopy (TEM), and SAXS. The in situ SAXS experiments reveal that mesophase formation occurs in two steps. First the nucleation and growth of a primary 2D‐hexagonal network (N1), associated with mixed micelles containing P123, then subsequent formation of a second network (N2), associated with micelles of pure RF8(EO)9. The data obtained from SAXS and TEM suggest that the N1 network is used as a nucleation center for the formation of the N2 network, which would result in the formation of a grain with two mesopore sizes. Understanding the mechanism of the formation of such materials is an important step towards the synthesis of more‐complex materials by fine tuning the porosity. 相似文献
53.
Baxter G. P. Curie Frau P. Hönigschmid O. Lebeau P. Meyer R. J. Watson H. E. Whytlaw-Gray R. Patterson H. S. Cawood W. Striebel H. Behrens E. E. Batuecas T. Cooper D. Le B. Maass O. Moles E. Salazar M. T. Greene C. H. Heller K. Wagner C. L. Briscoe H. V. A. Kikuchi S. Peel J. B. Hahn O. 《Analytical and bioanalytical chemistry》1933,95(9-10):358-360
Analytical and Bioanalytical Chemistry - 相似文献
54.
W. Manchot H. Gall J. König O. Scherer H. R. Ambler T. C. Sutton T. J. Drakeley H. Nicol P. Schuftan A. T. Larson C. W. Whittaker A. B. Lamb W. E. Vail P. Lebeau P. Marmasse J. I. Graham C. de la Condamine A. Thau J. Thorbun L. Wein H. Lent H. Kast H. Selle M. Nicloux S. H. Katz G. Wittig J. E. Underwood A. Krogh P. Brandt Rehberg Shigeru Nishi J. Johnston und A. C. Walker 《Fresenius' Journal of Analytical Chemistry》1928,75(1-2):39-46
Ohne Zusammenfassung 相似文献
55.
P. L. De Verter E. W. Dean G. m. b. H. Mono W. Steuer E. Ott L. S. Walters P. Lebeau P. Marmasse Siemens A. G. Halske J. Ŝvéda A. Dobrjanski W. H. Ross H. L. Trumbull K. Kling G. G. Oberfell S. D. Sbinkle S. B. Meserve A. M. Erskine B. Hilliger F. Krüger O. Reinkober H. Riegger H. Deringer E. Berl K. Andress L. Jordan J. R. Eckman 《Analytical and bioanalytical chemistry》1929,76(11-12):456-463
56.
Benedicte Soulet Annick Tauxe Joseph Tarradellas 《International journal of environmental analytical chemistry》2013,93(10):659-667
Five acidic drugs (clofibric acid, ibuprofen, ketoprofen, mefenamic acid and diclofenac) were chosen in order to determine their behavior in a sewage treatment plant (STP). An analytical method using solid phase extraction (SPE) and a gas chromatograph coupled with a mass spectrometer (GC-MS) was used. The results show that four pharmaceuticals (clofibric acid, ketoprofen, mefenamic acid and diclofenac) are not well removed by treatment in Swiss STPs. Maximum concentration in the effluent was determined for mefenamic acid up to 1.0 µg/L. This component seems to be relevant in Swiss STPs effluents and we can expect its presence in surface waters. 相似文献
57.
S. Legand C. Bouyer V. Dauvois F. Casanova D. Lebeau C. Lamouroux 《Journal of Radioanalytical and Nuclear Chemistry》2014,302(1):27-39
The direct dissolution of UC, a potential fuel for generation-IV nuclear reactors, in nitric acid can produce organic complexants that may interfere with the consumed fuel reprocessing based on liquid–liquid extraction. This study shows the presence of 17 % of carboxylic and polycarboxylic acids (e.g. benzenepentacarboxylic acid). 25 % of the carbon mass balance seemed to correspond to unfunctionalized polyaromatic compounds with more than 3–4 aromatic rings. Under an active oxidation process, these compounds become smaller and very functionalized polyaromatic compounds. Structures have been proposed for 8 % of the carbon mass balance. 相似文献
58.
Fabrice O. M. Gaslain Cyril Delacôte Alain Walcarius Bénédicte Lebeau 《Journal of Sol-Gel Science and Technology》2009,49(1):112-124
A wide range of mercaptopropyl-functionalized silica spherical particles of MCM-41 and MCM-48 (M41S family) have been prepared
by co-condensation of mercaptopropyl trimethoxysilane (MPTMS) or mercaptopropyl triethoxysilane (MPTES) and tetraethoxysilane
(TEOS) precursors in hydroalcoholic medium in the presence of a cationic surfactant as templating agent and ammonia as catalyst.
It was possible to control the mesostructure type (hexagonal or cubic) by monitoring the water-to-ethanol ratio and the type
of organoalkoxysilane precursor employed. Materials displaying various functionalization levels were obtained by varying the
MPTMS or MPTES contents from 3 to 50% in the co-condensation synthesis medium. This gave rise to a wide range of porous solids
with approximately the same particle size and morphology but featuring different functionalization levels and various degrees
of structural order. They were characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms and BET analysis, scanning and transmission electron microscopy, 29Si and 13C solid state nuclear magnetic resonance (NMR), particle size distribution measurements, and elemental chemical analysis.
Mercaptopropyl groups were readily incorporated with high yields (>90%) by the co-condensation route. All samples exhibited
spherical morphology with similar particle size but both the level of ordering and porosity of solids obtained by co-condensation
were found to decrease when increasing the amount of organo-functional groups. 相似文献
59.
Benedicte Friot David Boyd Kimberley Willis Bertrand Donnio Goran Ungar Duncan W. Bruce 《Liquid crystals》2013,40(5):605-611
The tricatenar, hydrogen-bonded complexes formed between alkoxystilbazoles and an imine were found to be mesomorphic. Subsequently, related tetracatenar complexes were also investigated and found to be non-mesomorphic. We report the transition temperatures of these complexes and discuss structural modifications. 相似文献
60.
In this paper we consider a transport-diffusion equation with coefficient of diffusion ε > 0 small and coefficient of transport M(x, t). We study the asymptotic behavior of the cost of the null controllability of such a system when ε 0+. If at least one trajectory associated to M(x, t) does not enter the control zone, we prove that this cost explodes exponentially as ε 0+. On the other hand, as long as trajectories reach the control region and the controllability time is sufficiently large, we prove that the cost is bounded as ε 0+, and moreover decays exponentially as ε 0+ as soon as all trajectories cross the boundary. 相似文献