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51.
C. Bittencourt M.P. Felicissimo A. Felten L.A.O. Nunes P. Ivanov E. Llobet J.-J. Pireaux L. Houssiau 《Applied Surface Science》2005,250(1-4):21-28
In this work, the composition and morphology of WO3 films loaded with different levels of Ag, prepared by screen-printing onto Si substrates and annealed in air were investigated. The TEM micrography showed that the films are grain-like; the grain size increases with the increase of the Ag loading level. The Raman spectroscopy showed the formation of a AgWO3 bronze structure. XPS and ToF-SIMS results showed that while undergoing annealing, the Ag atoms migrate to the surface forming clusters. The molecular images obtained by ToF-SIMS showed that the NH3 binds preferentially at the surface of the Ag clusters. No preferential binding site was found for hydrocarbon contamination. 相似文献
52.
J. J. Pireaux J. Riga R. Caudano J. Verbist Y. Gobillon J. Delhalle S. Delhalle J. M. Andre 《Journal of polymer science. Part A, Polymer chemistry》1979,17(4):1175-1186
The electronic structure of a clean copolymer of ethylene and tetrafluoroethylene is investigated by measuring the ESCA spectra of the core and valence levels. The chemical composition and alternating (>95%) structure of the copolymer, characterized separately by classical methods, is verified by analyzing the C 1s core-level spectrum. The comparison of the experimental valence band with an original EHCO band-structure calculation, and with similar data for a model of polymer with block structure, shows that the combined methods allow us to distinguish between the two compounds through their valence-band spectra. 相似文献
53.
Bobeldijk I Bouwhuis M Ireland DG de Jager CW Jans E de Jonge N Kasdorp WJ Konijn J Lapikás L van Leeuwe JJ van der Meer RL Nooren GJ Passchier E Schroevers M van der Steenhoven G Steijger JJ Theunissen JA van Uden MA de Vries H de Vries R de Witt Huberts PK Blok HP van den Brink HB Dodge GE Harakeh MN Hesselink WH Kalantar-Nayestanaki N Pellegrino A Spaltro CM Templon JA Hicks RS Kelly JJ Marchand C 《Physical review letters》1994,73(20):2684-2687
54.
van der Klink JJ 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2001,148(1):147-154
It is shown that the NMR reciprocity theorem is a variant of a problem considered by Lorentz in 1895. This formulation is quite general and applies to electric-dipole-based as well as coil-based or resonator-based magnetic resonance probes. The reasoning is related to, but different from, the proof of the reciprocity theorem for radiofrequency networks and for transmit/receive antenna systems in telecommunications. The signal-to-noise ratio of the NMR experiment is also discussed in very general terms. 相似文献
55.
J.J. Pireaux J. Riga R. Caudano J.J. Verbist J.M. Andre J. Delhalle S. Delhalle 《Journal of Electron Spectroscopy and Related Phenomena》1974,5(1):531-550
Theoretical and experimental results for the band structure of fluoropolymers are presented. Original theoretical results are obtained from the extende Hückel method of the following polymers : (I) polyethylene, (II) polyvinyl fluoride, (III) polydifluoro (1,2) ethylene-cis, (IV) polydifluoro (1,2) ethylene-trans, (V) polyvinylidene fluoride, (VI) polytrifluoroethylene and (VII) polytetrafluoroethylene. Band structures schemes and density of state histograms are calculated. Results are compared with valence band structures as revealed by E.S.C.A. spectroscopy, using a flood gun to neutralize char effects on these compounds. In this work, accent is put on the substituent effect of fluorine. Correlation between theoretical and observed density of 相似文献
56.
Gold oxide is produced by oxygen DC reactive sputtering in a UHV compatible chamber. It is subsequently characterized by High Resolution Electron Energy Loss, Auger and X-ray Photoelectron Spectroscopies. It is demonstrated that the oxide is of the Au2O3 type (auric oxide) and that it decomposes under thermal treatment. Au2O (aurous oxide) is a possible intermediate of this reduction. 相似文献
57.
De Palma R Laureyn W Frederix F Bonroy K Pireaux JJ Borghs G Maes G 《Langmuir : the ACS journal of surfaces and colloids》2007,23(2):443-451
Tantalum pentoxide (Ta2O5) is a promising material for the realization of biological interfaces because of its high dielectric constant, its high chemical stability, and its excellent passivating properties. Nevertheless, the deposition of highly organized silane SAMs to realize well-defined and tailored Ta2O5-based (bio)interfaces, has not been studied in great detail as of yet. In this work, we have investigated the formation of a highly ordered, dense monolayer of trichlorosilanes on Ta2O5 surfaces. Specifically, two different cleaning procedures for Ta2O5 were compared and (n-decyl)trichlorosilane (DTS) was used to study the effect of both cleaning methods on the silanization of Ta2O5. Both types of cleaning allowed the formation of complete and crystalline DTS monolayers on Ta2O5, in contrast with the incomplete, disordered silane layer assembled on uncleaned Ta2O5. The deposited self-assembled monolayers were studied by means of contact angle goniometry, Brewster angle FTIR, X-ray photoelectron spectroscopy, cyclic voltammetry, and ellipsometry. Infrared analysis exhibited a highly ordered DTS silane film on Ta2O5 and indicated a larger tilt angle of the alkyl chains on this substrate by comparison to DTS on SiO2. Furthermore, with use of ellipsometry and XPS, the silane film thickness on Ta2O5 was determined to be substantially smaller than that reported in the literature for DTS on SiO2, supporting the observations of an increased tilt angle (approximately 45 degrees ) on Ta2O5 than on SiO2 (approximately 10 degrees ). By means of cyclic voltammetry, the formation of a dense, essentially pinhole-free, silane film was observed on the cleaned samples. In conclusion, the fully characterized and optimized procedure for the silanization of Ta2O5 surfaces with trichlorosilanes will allow the formation of well-defined, reproducible, and controllable chemical interfaces on Ta2O5. 相似文献
58.
R. Leghrib E. Llobet R. Pavelko A.A. Vasiliev A. Felten J.J. Pireaux 《Procedia Chemistry》2009,1(1):168-171
Gas sensors based on oxygen plasma functionalised MWCNTs and plasma-treated nanotubes decorated either with gold nanoclusters or tin oxide nanoparticles were evaluated for the detection of NO2, CO and ethylene. The sensor active layers were deposited by airbrushing onto micro-machined silicon transducers. Sensitivity, linearity, selectivity, response and recovery times and humidity effect were studied. XPS and TEM were employed to analyse the gas sensitive films. Among the different sensors tested, those based on tin oxide decorated MWCNTs showed the highest sensitivity to NO2 (at ppb level) and the lowest humidity cross-sensitivity when operated at room temperature. 相似文献
59.
The monochromatized electron beam of a high resolution electron energy loss (HREEL) spectrometer is used for accurate (±5 meV) measurement of the work function changes during exposure of a Ag(110) single crystal surface to oxygen. Absolute calibration of the results is made by comparison with Kelvin probe data. The procedure allows the precise determination of the electron impact energy, which is an important parameter for quantitative HREELS analysis. Furthermore, in the case of oxygen adsorbed on Ag(110), the occurrence of several LEED (n×1) superstructures enables a calibration of the HREELS data with respect to surface coverage. 相似文献
60.
Experimental results on float glass by recent analytical techniques — ESCA, photon emission induced by ion bombardment and ellipsometry — support the conclusion that tin from a metal bath penetrates with relatively high concentration only in the first few nanometers from the surface. 相似文献