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51.
Fratini E Bonini M Oasmaa A Solantausta Y Teixeira J Baglioni P 《Langmuir : the ACS journal of surfaces and colloids》2006,22(1):306-312
In this paper, we report for the first time a microstructural characterization of pyrolysis oils obtained from biomass. Bio crude oils (BCOs) are good candidates as substitutes for mineral oils as fuels. By using small-angle neutron scattering (SANS), we show that BCOs are nanostructured fluids constituted by a complex continuous phase and nanoparticles mainly formed by the association of units of pyrolytic lignins. The aggregation of these units during the time produces branched structures with fractal dimension D(f) between 1.4 and 1.5, which are responsible for BCO aging. SANS results fully support the recently formulated thermal ejection theory, accounting for the mechanism of formation of the lignin fraction in oils obtained from fast pyrolysis of biomass. 相似文献
52.
Manfredo Hörner Gelson Manzoni de Oliveira Janaina Sartori Bonini Herton Fenner 《Journal of organometallic chemistry》2006,691(4):655-658
3-(2-fluorophenyl)-1-(3-nitrophenyl)triazene reacts with mercury(II) acetate in tetrahydrofuran in the presence of 2,2′-bipyridilamine to give yellow crystalline blocks of polymeric {HgII[NNN(PhR)2]2}n (R = NO2, F). The new triazenide complex belongs to the triclinic space group . In a molecule of {HgII[NNN(PhR)2]2} two deprotonated 1,3-diaryl-substituted triazenide ligands are coordinated in an opposite way to one Hg(II) ion by means of primary and secondary bonds. The Hg(II) ions are placed on the inversion centers of translation operated {Hg[NNN(PhR)2]2} moieties which are stacked along the crystallographic a-axis forming infinite unidimensional chains linked through metalocene alike Hg-η2,η2-arene π-interactions. 相似文献
53.
Solladié-Cavallo A Lupattelli P Bonini C Ostuni V Blasio ND 《The Journal of organic chemistry》2006,71(26):9891-9894
New enantiopure aniline-containing amino alcohols are directly derived from trans-(R,R)-2-(2-nitrophenyl)-3-phenyloxirane, by alternative regioselective double reductions. Subsequent selective alkylation procedures and derivatizations provide a rapid and high-yielding access to different chiral ligands, bases, and benzoxazines, without loss of optical purity. 相似文献
54.
Amati M Bonini C D'Auria M Funicello M Lelj F Racioppi R 《The Journal of organic chemistry》2006,71(19):7165-7179
The reaction between an iminophosphorane with furan-2-carbaldehyde, thiophene-2-carbaldehyde, furan-3-carbaldehyde, and thiophene-3-carbaldehyde at 60 degrees C gives the corresponding trans imines in 53-84% yields, while the same reaction at 100 degrees C gives a mixture of the corresponding trans and cis imines. Whether the iminophosphorane reacted with 5-nitrofuran-2-carbaldehyde or 5-nitrothiophene-2-carbaldehyde only the trans imines were obtained in 85-89% yields. The irradiation of the imines obtained from thiophene-2-carbaldehyde and thiophene-3-carbaldehyde gave the corresponding photocyclization products. Cis/trans stereochemistry of the imines can be assigned simulating the UV-vis spectra. In the case of the imine from furan-2-carbaldehyde the computed spectra are characterized by an intense absorption at 361 and 357 nm respectively for the trans-1 and trans-2 structures. No other absorptions of comparable intensity have been predicted: the agreement with the experimental spectrum can be considered good. Furthermore, the experimental weak peaks at 280 and 270 nm can be associated to the computed transitions at 278 and 260 nm for the trans-1 isomer. Several minima of the energy surface can be assigned to the cis isomer, and they all present a very similar energy. The structures of the cis-1 and cis-2 isomers present quite coincident computed electronic spectra. In both cases, the computed spectrum shows two principal features. For the cis-1 structure, the first characteristic absorption is located at 414 nm and the second one at 284 nm. For the cis-2 structure, the first feature is located at 412 nm and the second one at 286 nm. The second transition is computed somewhat more intense. The experimental spectrum could be the consequence of similar populations of the planar cis structure (cis-3) and nonplanar cis structures (cis-1, cis-2, and their enantiomers). 相似文献
55.
M Julia BF Flaminio Alexandre S Borges Daryl V Nydam David W Horohov Rolf Hecker Mary Beth Matychak 《Journal of immune based therapies and vaccines》2007,5(1):1-17
Background
Cytosine-phosphate-guanosine oligodeoxynucleotide (CpG-ODN) has been used successfully to induce immune responses against viral and intracellular organisms in mammals. The main objective of this study was to test the effect of CpG-ODN on antigen presenting cells of young foals. 相似文献56.
C. C. Bonini C. Iavarone C. Trogolo G. A. Poulton 《Journal of mass spectrometry : JMS》1981,16(2):68-71
The mass spectra of a series of methyl ethers of isotetronic acids have been examined and the modes of fragmentation rationalized on the basis of two general schemes. 相似文献
57.
58.
F. Bonini V. Fraaije G. Fink 《Journal of polymer science. Part A, Polymer chemistry》1995,33(14):2393-2402
Several propylene polymerizations are carried out with supported metallocene catalyst, prepared by reaction of silica gel with methylaluminoxane and then with rac-dimethylsi-lanediylbis(indenyl)zirconiumdichloride. The rate–time curves obtained are analyzed to understand the influence of support and triisobutylaluminium on the reaction. As a first attempt to model this system we developed a partially new praticle growth model, based on a shell by shell fragmentation hypothesis (gradual break-up from the outside to the inside of the particle), and a final multigrain structure of the particle. A kinetic scheme including the TIBA interaction with the supported catalyst is also presented. The model prediction and the experimental data are compared for the rate–time curves and polymer properties. © 1995 John Wiley & Sons, Inc. 相似文献
59.
Bianca F. Bonini Elisabetta Foresti Rino Leardini Gaetano Maccagnani Germana Mazzanti 《Tetrahedron letters》1984,25(4):445-448
Silylated thiirans upon oxidation with peroxyacids do not give exclusively the corresponding S-oxides but, in addition some products derived from ring opening. The stereochemistry of the oxidation to thiiran-1-oxides is to the silyl group as demonstrated by X-ray analysis. 相似文献
60.
Bianca F. Bonini Giovanni Gottarelli Stefano Masiero Gian Piero Spada Paolo Mariani Bin Yang 《Liquid crystals》1993,13(1):13-22
Several derivatives with the trans-stilbene oxide moiety as the central chiral core were synthesized. With the appropriate substituents, nematic and smectic C phases were observed. One derivative was obtained with an ee of 47 per cent by asymmetric synthesis. The chemical stability of these epoxides is low and they rearrange to give substituted phenyl benzylketones which are also liquid-crystalline. The structure of the two solid phases present in all the derivatives and of the smectic C phases was investigated by X-ray diffraction. 相似文献