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991.
Tuning of redox properties of iron and iron oxides via encapsulation within carbon nanotubes 总被引:2,自引:0,他引:2
We report the tuning of the redox properties of iron and iron oxide nanoparticles by encapsulation within carbon nanotubes (CNTs) with varying inner diameters. Raman spectroscopy was employed to investigate the interaction of the encapsulated nanoparticles with the CNTs. A red shift of the Fe-O mode is observed in the nanoparticles deposited on the outer CNT surfaces with respect to bulk Fe2O3. However, this mode is found to be stepwise blue-shifted with decreasing inner diameter in the CNT-encapsulated Fe2O3 nanoparticles, suggesting an enhanced interaction of Fe2O3 with the inner CNT surface as its curvature increases. The autoreduction of the encapsulated Fe2O3 is significantly facilitated inside CNTs with respect to the outside nanoparticles. Interestingly, it becomes more facile with decreasing CNT channel diameter as evidenced by temperature programmed reaction, in situ XRD, and Raman spectroscopy. The oxidation of encapsulated metallic Fe nanoparticles on the other hand is retarded in comparison to that of the outside Fe particles as shown by in situ XRD and gravimetrical measurements with an online microbalance. We attribute this tunable redox behavior of transition metal nanoparticles inside CNTs to a particular electronic interaction of the encapsulates with the interior CNT surface, which stabilizes the metallic state of Fe. 相似文献
992.
993.
Bao Qin Li 《Archiv der Mathematik》2007,89(4):350-357
The paper characterizes entire solutions to partial differential equations
for polynomials p in
.
Received: 14 August 2006 相似文献
994.
T. Q. Bao P. Gupta B. S. Mordukhovich 《Journal of Optimization Theory and Applications》2007,135(2):179-203
We study multiobjective optimization problems with equilibrium constraints (MOPECs) described by parametric generalized equations
in the form
where both mappings G and Q are set-valued. Such models arise particularly from certain optimization-related problems governed by variational inequalities
and first-order optimality conditions in nondifferentiable programming. We establish verifiable necessary conditions for the
general problems under consideration and for their important specifications by using modern tools of variational analysis
and generalized differentiation. The application of the obtained necessary optimality conditions is illustrated by a numerical
example from bilevel programming with convex while nondifferentiable data. 相似文献
995.
Han F Bao Y Yang Z Fyles TM Zhao J Peng X Fan J Wu Y Sun S 《Chemistry (Weinheim an der Bergstrasse, Germany)》2007,13(10):2880-2892
Bis-thiocarbono-hydrazones are found to be a class of sensitive, selective, ratiometric, and colorimetric chemosensors for anions such as fluoride (F(-)) or acetate (Ac(-)). The sensitivities, or the binding constants of the sensors with anions, were found to be strongly dependent on the substituents appended on the pi-conjugation framework, the delocalization bridge CH==N, the aromatic moiety, and the hetero atom in the C==X group (X=O, S) of the sensors. Single-crystal structures and (1)H NMR titration analysis shows that the --CH==N-- moiety is a hydrogen-bond donor, and it is proposed that an additional CHF hydrogen bond is formed for the sensors in the presence F(-). A sensor bearing anthracenyl groups is demonstrated as a switch-on fluorescent chemosensor for F(-) and Ac(-). The recognition of F(-) in acetonitrile (MeCN) by a sensor with nitrophenyl substituents is tolerant to MeOH (MeCN/MeOH=10:1, v/v) and water (MeCN/H(2)O=30:1, v/v); at these solvent ratios the absorption intensity of the sensor-F(-) complex solution at maximal absorption wavelength was attenuated to half of the original value in pure MeCN. 相似文献
996.
Berni E Kauffmann B Bao C Lefeuvre J Bassani DM Huc I 《Chemistry (Weinheim an der Bergstrasse, Germany)》2007,13(30):8463-8469
We report on the dramatic effect of increasing helix diameter on the hybridization of oligopyridine-dicarboxamide strands into double helices. Upon replacing a single pyridine by a 1,8-diazaanthracene unit within an oligomeric strand, a 4.7 A enlargement of the helix diameter occurs parallel to the long anthracene axis. This structure change results in a spectacular stabilization of the double helical hybrids derived from these strands (factors of over 10(7)). Detailed investigations of the hybridization process using X-ray crystallography, NMR, fluorescence measurements and molecular mechanics calculations allowed us to assign the duplex stabilization to two enthalpic effects. First, the increase in diameter results in an augmented surface, involved in intermolecular pi-pi stacking. Second, the enlarged diameter leads to a lower tilt angle of the helical strand, with respect to the helix axis, which in turn results in smaller dihedral angles at the aryl-amide linkages and thus a considerably lowered enthalpic cost of the spring-like extension of the strands during the hybridization process. These results provide novel insights into how subtle tuning of molecular components may result in considerable and rationalizable changes in double helical supramolecular architectures. 相似文献
997.
Employing ethyl 2-oxocyclohexanecarboxylate as a novel, efficient, and versatile ligand, the copper-catalyzed coupling reactions of various N/O/S nucleophilic reagents with aryl halides could be successfully carried out under mild conditions. A variety of products including N-arylamides, N-arylimidazoles, aryl ethers, and aryl thioethers were synthesized in good to excellent yields. 相似文献
998.
CuI-catalyzed coupling of 1-bromo-2-iodobenzenes with beta-keto esters in THF at 100 degrees C leads to 2,3-disubstituted benzofurans. This domino transformation involves an intermolecular C-C bond formation and a subsequent intramolecular C-O bond formation process. Benzofurans with different substituents at the 5- and 6-position are accessible by employing the corresponding 1-bromo-2-iodobenzenes. 相似文献
999.
1000.
用于高分辨率 PET探测器的LSO闪烁晶体的研究 总被引:6,自引:1,他引:5
LSO晶体具有密度大光输出量强和衰减时间短的特性使其成为在PET探测器领域的应用潜在的闪烁晶体材料.按照辐射成象系统应用的性能要求我们对LSO晶体的闪烁特性进行了评价.为了获取较高的光输出量,研究和验证了许许多多的晶体表面的状况对光输出量的影响.对于单个LSO晶体和R5900-00-C12位敏管相耦合的系统,钠伽马射线源的511keV的能量峰处的能量分辨率为15%,时间分辨率为0.65ns,最后对三个LSO阵列分别成象验证了其空间分辨本领. 相似文献