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排序方式: 共有152条查询结果,搜索用时 31 毫秒
91.
92.
M. C. Abreu C. Baglin A. Baldisseri A. Baldit C. Barrière M. Bedjidian P. Bordalo A. Bussière P. Busson R. Cases J. Castor T. Chambon C. Charlot B. Chaurand D. Contardo E. Descroix A. Devaux O. Drapier J. Fargeix X. Felgeyrolles R. Ferreira P. Force L. Fredj J. M. Gago C. Gerschel P. Gorodetzky B. Grosdidier J. Y. Grossiord A. Guichard J. P. Guillaud R. Haroutunian D. Jouan L. Kluberg R. Kossakowski G. Landaud P. Liaud C. Lourenço S. Papillon L. Peralta J. R. Pizzi C. Racca S. Ramos A. Romana R. A. Salmeron P. Sonderegger F. Staley S. Silva X. Tarrago J. Varela F. Vazeille 《Zeitschrift fur Physik C Particles and Fields》1992,55(3):365-371
Meson production in proton, oxygen and sulphur interactions with uranium targets at 200 GeV/nucleon is studied. We measure the inclusive meson cross-section d /dP
T
2
and its evolution fromp+U to S+U. The cross-section fitted with an exponential gives an inverse slopeP
T0 of the order of 210 MeV/c. As a function of the neutral transverse energy,P
T0 values show a slight rise followed by a plateau. The normalized difference (+––)/– between positive and negative meson cross-sections is found to increase withE
T
.also at ISEL 相似文献
93.
The synthesis of [1,4]dioxino[2,3-c]quinolines and [1,4]dioxepino[2,3-c]quinolines with restrained conformation of the piperidine ring, which represent 1,2,3,4-tetrahydroquinolines containing two heteroatom substituents at positions 3 and 4, is described. In addition, the application of this approach for the synthesis of 1-sulfur analogues is discussed. Both series are helpful tools for three-dimensional quantitative structure-activity relationship studies in the field of modulators of multidrug resistance. 相似文献
94.
Inside Cover: New Chiral Reagent for Installation of Pharmacophoric (S)‐ or (R)‐2‐(Alkoxyphosphono)‐1‐amino‐2,2‐difluoroethyl Groups (Chem. Eur. J. 21/2016) 下载免费PDF全文
95.
Hromadová M Kolivoška V Sokolová R Gál M Pospíšil L Valášek M 《Langmuir : the ACS journal of surfaces and colloids》2010,26(22):17232-17236
Extended viologens represent a group of organic molecules intended to be used as molecular wires in molecular electronic devices. Adsorption properties of a novel series of extended viologen molecules were studied at the mercury electrode|electrolyte interface. These compounds form compact monolayers around the potential of zero charge with a constant differential capacitance value of 2.5 ± 0.2 μF cm(-2) independent of temperature, length of the molecule, and its bulk concentration. At more negative potentials their reduction in the adsorbed state takes place. We showed that the adsorption process is diffusion controlled and time needed to fully cover the electrode surface is independent of the electrode potential. A modified Koryta equation was employed for the calculation of the surface concentration of the adsorbates leading to the value of 5.3 × 10(-11) mol cm(-2) for the shortest wire and to 1.6 × 10(-11) mol cm(-2) for the longest one. Based on the space filling model and the differential capacitance value in the compact film region, it was postulated that these molecules lay flat on the electrode surface. 相似文献
96.
97.
Baldoli C Rigamonti C Maiorana S Licandro E Falciola L Mussini PR 《Chemistry (Weinheim an der Bergstrasse, Germany)》2006,12(15):4091-4100
We have designed and synthesised a new organometallic molecule containing three ferrocene groups for use as a highly sensitive electrochemical marker in biological assays. This trisferrocene derivative was conjugated to different PNA monomers, and the electrochemical activities of the conjugates were extensively investigated in organic solvents, in view of their potential diagnostic applications. The results showed that the introduction of a trisferrocene unit on the PNA monomer triples the current signal in comparison with the monoferrocene-labelled one. Despite their greater molecular complexity, trisferrocene-conjugated PNA monomers are even more electrochemically active than the reference ferrocene. By using differential pulse voltammetry (DPV), the detection limit can reach 10(-8) M in acetonitrile solution. These results are a good premise for the use of the trisferrocene unit as an effective electrochemical probe for biomolecules. 相似文献
98.
99.
Orazio A. Attanasi Paolino Filippone Amedeo Mei Francesca Romana Perrulli Franco Serra-zanetti 《合成通讯》2013,43(11):1411-1421
Pyrrole and several its derivatives have been subjected to extensive chemical investigations, while substituted 1-aminopyrroles remain a class of compounds about which relatively little is known due to the far from trivial problem sposed by their syntheis. In fact, 1-aminopyrroles appear to be prepared mainly by direct reactionfrom conjugated azoalkenes,2 that unfortunately represent a class of relatively little 相似文献
100.
Nováková Kateřina Navrátil Tomáš Šestáková Ivana Le Minh Phuong Vodičková Hana Zámečníková Brigita Sokolová Romana Bulíčková Jana Gál Miroslav 《Monatshefte für Chemie / Chemical Monthly》2015,146(5):819-829
Monatshefte für Chemie - Chemical Monthly - The present study is focused on characterization and elucidation of transport processes of the environmentally important element cadmium across... 相似文献