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31.
Gustavo A. Pasquale Diego M. Ruiz Jorge L. Jios Juan C. Autino Gustavo P. Romanelli 《Tetrahedron letters》2013
A simple, convenient, and environmentally benign synthesis of 1,5-benzodiazepines is developed by condensing different o-phenylenediamines and 1,3-aryl-1,3-propanodiones. The reaction is catalyzed by a Preyssler (NaH14P5W30O110, HPA) heteropolyacid as a safe, clean, and recyclable catalyst. The method is operationally simple and provides access to a variety of 1,5-benzodiazepines in good to excellent yields. 相似文献
32.
Dr. V. Celentano Dr. D. Diana C. Di Salvo Dr. L. De Rosa Dr. A. Romanelli Prof. R. Fattorusso Dr. L. D. D'Andrea 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(16):5534-5537
Conformational constrained β‐hairpin peptides are useful tool to modulate protein–protein interactions. A triazole bridge in hydrogen‐bonded positions between two antiparallel strands induces a conformational stabilization of the β‐hairpin peptide. The entity of the stability of the β‐hairpin peptide depends on the length of the bridge. 相似文献
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Dr. Carlo Diaferia Dr. Concetta Avitabile Dr. Marilisa Leone Enrico Gallo Dr. Michele Saviano Prof. Dr. Antonella Accardo Prof. Dr. Alessandra Romanelli 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(57):14307-14316
Peptides and nucleic acids can self-assemble to give supramolecular structures that find application in different fields, ranging from the delivery of drugs to the obtainment of materials endowed with optical properties. Forces that stabilize the “suprastructures” typically are hydrogen bonds or aromatic interactions; in case of nucleic acids, Watson-Crick pairing drives self-assembly while, in case of peptides, backbone hydrogen bonds and interactions between aromatic side chains trigger the formation of structures, such as nanotubes or ribbons. Molecules containing both aromatic peptides and nucleic acids could in principle exploit different forces to self-assemble. In this work we meant to investigate the self-assembly of mixed systems, with the aim to understand which forces play a major role and determine formation/structure of aggregates. We therefore synthesized conjugates of the peptide FF to the peptide nucleic acid dimer “gc” and characterized their aggregates by different spectroscopic techniques, including NMR, CD and fluorescence. 相似文献
36.
We have found, by varying two parameters, several stationary trajectories in a system consisting in many elastically coupled particles that are placed in a periodic ratchet potential on a ring. The system is assumed to be over-damped and driven by an external potential that is periodic both in space and time. The transport properties of these orbits are quite different and their values are quantified. The symmetries allow us to study the orbits with and without the presence of thermal fluctuations and there is found current inversions due to the addition of white Gaussian noise. 相似文献
37.
Celentano V Diana D De Rosa L Romanelli A Fattorusso R D'Andrea LD 《Chemical communications (Cambridge, England)》2012,48(5):762-764
β-Hairpin peptides were conformationally stabilized through a 1,4 disubstituted 1,2,3-triazole interstrand linkage. A NMR conformational analysis revealed that the β-hairpin content depends on the number and position of substituent methylene units of the 1,2,3-triazole ring. These results will allow the design of metabolically stable peptidomimetic analogs of bioactive β-hairpin peptides. 相似文献
38.
In this paper we discuss the dynamics and transport properties of a massive particle in a ratchet type potential immersed in a dissipative environment. The directional currents and characteristics of the motion are studied as the specific frictional coefficient varies, finding that the stationary regime is strongly dependent on this parameter. The maximal Lyapunov exponent and the current show large fluctuations and inversions, therefore for some range of the control parameter, this inertial ratchet could originate a mass separation device. Also an exploration of the effect of a random force on the system is performed. 相似文献
39.
A. Parmentier C. Andreani G. Romanelli J. J. Shephard C. G. Salzmann R. Senesi 《Frontiers of Physics》2018,13(1):136101
The hydrogen mean force from experimental neutron Compton profiles is derived using deep inelastic neutron scattering on amorphous and polycrystalline ice. The formalism of mean force is extended to probe its sensitivity to anharmonicity in the hydrogen-nucleus effective potential. The shape of the mean force for amorphous and polycrystalline ice is primarily determined by the anisotropy of the underlying quasi-harmonic effective potential. The data from amorphous ice show an additional curvature reflecting the more pronounced anharmonicity of the effective potential with respect to that of ice Ih. 相似文献
40.
Gabriela Marinoschi Rosa Maria Mininni Silvia Romanelli 《Journal of Optimization Theory and Applications》2017,173(1):56-77
We deal with an optimal control problem in coefficients for a strongly degenerate diffusion equation with interior degeneracy, which is due to the nonnegative diffusion coefficient vanishing with some rate at an interior point of a multi-dimensional space domain. The optimal controller is searched in the class of functions having essentially bounded partial derivatives. The existence of the state system and of the optimal control are proved in a functional framework constructed on weighted spaces. By an approximating control process, explicit approximating optimality conditions are deduced, and a representation theorem allows one to express the approximating optimal control as the solution to the eikonal equation. Under certain hypotheses, further properties of the approximating optimal control are proved, including uniqueness in some situations. The uniform convergence of a sequence of approximating controllers to the solution of the exact control problem is provided. The optimal controller is numerically constructed in a square domain. 相似文献