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911.
The immobilization of surface-derivatized gold nanoparticles onto methyl-terminated self-assembled monolayers (SAMs) on gold surface was achieved by the cooperation of hydrophobic and electrophoretic forces. Electrochemical and scanning probe microscopy techniques were utilized to explore the influence of the SAM's structure and properties of the nanoparticle/SAM/gold system. SAMs prepared from 1-decanethiol (DT) and 2-mercapto-3-n-octylthiophene (MOT) were used as hydrophobic substrates. The DT SAM is a closely packed and organized monolayer, which can effectively block the underlying gold and inhibit a variety of solution species including organic and inorganic molecules from penetrating, whereas the MOT monolayer is poorly packed or disorganized (because of a large difference in dimension between the thiophene head and the alkylchain tail) and permeable to many organic probes in aqueous solution but not to inorganic probes. Thus, the MOT monolayer provides a more energetically favorable hydrophobic surface for the penetration and adsorption of organic species than the DT monolayer. This hypothesis is supported by experiments in which the density of hydrophobically immobilized nanoparticles on the MOT SAM is much larger than that on the DT SAM. The results also suggest new approaches for modification of macroscopic surfaces with nanoscopic particles. 相似文献
912.
913.
The reaction of n-butyllithium with 2-bromo-3-chloro pyridine as a function of temperature, the amount of n-butyllithium used and the order of introduction of the reagents, gives, besides bromine-lithium exchange, an unexpected métallation of the pyridine ring and bromine migration from the 3 to 4 position. A novel mechanism to explain this and the similar behavior of 3-bromo-2-fluoro pyridine with n-butyllithium is proposed. 相似文献
914.
915.
The structure and harmonic vibrations of MgnOn (n = 3–10) clusters have been investigated using density functional theory. All structures are found to be cumulenic Dnh rings (equal bonds, alternating angles), with one intense out‐of‐plane mode and three infrared (IR)‐active degenerate modes, of which the highest one is extremely intense and increases asymptotically to 1000 cm?1 for n = 10 at the B3LYP/6‐311++G(2d,2p) level. Comparisons with C2n clusters show that BnNn and BenOn clusters, the structure and bonding type for the MgnOn clusters are consistent with those of the C2n (n = 3, 5, 7,…) clusters BnNn(n = 3–10) and BenOn(n = 3–10) clusters. © 2006 Wiley Periodicals, Inc. Int J Quantum Chem, 2007 相似文献
916.
In the work described in this paper, 7-hydroxyflavone and chrysin were phosphoylated by a modified Atheron-Todd reaction. Three new phosphorylated flavonoids (PF) were obtained, and the structures of the target products were determined by X-ray and NMR data and electrospray ionization (ESI) tandem mass spectroscopy (MS). The mixed solutions of the phosphorylated flavonoids and different proteins such as insulin, lysozyme, and cytochrome c were injected in an ion trap mass spectrometer. The results show that all the phosphorylated flavonoids could form non-covalent complexes with the proteins mentioned above, while non-covalent complexes were not detected from the mixed solution of the chrysin or 7-hydroxyflavone with proteins. The research shows that the phosphorylated flavonoids could enhance the interaction with proteins. It may imply their important role in biological processes. The method described in this paper provides us additional information for studying such interactions for phosphorylated flavonoids in this important field. 相似文献
917.
2-(3- and 2-Pyridylcarbonyl)benzoic acids (2,3), 2-(2-pyridylcarbonyl)thiophene-3-carboxylic acid (6), 2-(3-quinolylcarbonyl)benzoic acid (10), and most of the corresponding esters (compounds 1,7 and 9 ) are readily synthesized and involved in a deprotonation-condensation sequence. Biologically active aza-anthraquinones such as benzo[g]isoquinoline-5,10-dione (2-azaanthraquinone, 4 ) and benzo[g]quinoline-5,10-dione (1-azaanthraquinone, 5) are prepared using the strategy. Extension to other heterocyclic quinones such as thieno[3,2-g]quinoline-4,9-dione (8) and benzo[j]phenanthridine-7,12-dione (11) is also investigated. 相似文献
918.
双核钴卟啉/DMF体系的吸氧热力学研究 总被引:4,自引:0,他引:4
关于单核金属卟啉体系的吸氧热力学已有广泛的研究.七十年代末至八十年代初,报导了一类面对面双时批双核钴的双氧配合物,根据ESR谱,认为存在Co-O-Co的超氧桥式结构.关于Co:02=1:1的双核钴双卟啉配合物的吸氧热力学,迄今未见报导.本工作用电子光谱法研究了一种由十个碳原子的脂肪二酰胺链连接两个四苯基卟啉的双核钴(Ⅱ)配合物在DMF溶液中与双氧的可逆结合作用,测定了吸氧热力学数据,用ESR谱法研究了钻离子与双氧的结合方式.1实验部分五·五样品和试剂双核钴(11)双环叶琳,CO。diTPP(diAMCs)的合成见文献间,其… 相似文献
919.
920.
Following an initial cleaning-up step on the D101 macroporous resin, a preparative high-speed counter-current chromatography (HSCCC) with a two-phase solvent system composed of n-hexane-ethyl acetate-methanol-water (1:0.9:0.9:1, v/v) was used to isolate and separate schizandrin and gomisin A from Schisandra chinensis. A total of 107 mg schizandrin and 36 mg gomisin A with purities of 99.5% and 99.1% were obtained from 400 mg crude extract in one-step elution and less than 3 h, and the structure identification was performed by UV, IR, MS, 1H NMR and 13C NMR. 相似文献