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931.
以异辛酸亚锡为催化剂,通过四臂聚乙二醇(4-armed PEG)引发右旋丙交酯(DLA)或左旋丙交酯(LLA)开环聚合合成四臂PEG-PLA对映体共聚物.通过纳米沉淀的方法制备了四臂PEG-b-PDLA胶束(PDM)、四臂PEG-b-PLLA胶束(PLM)和四臂PEG-b-PDLA/四臂PEG-b-PLLA立体复合胶束(SCM),并对其形貌、粒径、稳定性和立体复合机理等进行系统表征.以阿霉素(DOX)为模型抗肿瘤药物载入胶束中,与PDM和PLM相比,SCM具有更优异的药物负载能力.与DOX相比,载药四臂PEG-PLA胶束,尤其是负载DOX的SCM,表现出更优异的肿瘤细胞增殖抑制效果,作用更持久,并且对正常细胞的毒性较小,从而揭示了其作为潜在抗肿瘤药物载体的良好前景. 相似文献
932.
Dynamic and Quantitative Control of the DNA‐Mediated Growth of Gold Plasmonic Nanostructures 下载免费PDF全文
Dr. Jianlei Shen Lifeng Xu Dr. Chunpeng Wang Dr. Hao Pei Prof.Dr. Renzhong Tai Prof.Dr. Shiping Song Prof.Dr. Qing Huang Prof.Dr. Chunhai Fan Prof.Dr. Gang Chen 《Angewandte Chemie (International ed. in English)》2014,53(32):8338-8342
Reproducible and controllable growth of nanostructures with well‐defined physical and chemical properties is a longstanding problem in nanoscience. A key step to address this issue is to understand their underlying growth mechanism, which is often entangled in the complexity of growth environments and obscured by rapid reaction speeds. Herein, we demonstrate that the evolution of size, surface morphology, and the optical properties of gold plasmonic nanostructures could be quantitatively intercepted by dynamic and stoichiometric control of the DNA‐mediated growth. By combining synchrotron‐based small‐angle X‐ray scattering (SAXS) with transmission electron microscopy (TEM), we reliably obtained quantitative structural parameters for these fine nanostructures that correlate well with their optical properties as identified by UV/Vis absorption and dark‐field scattering spectroscopy. Through this comprehensive study, we report a growth mechanism for gold plasmonic nanostructures, and the first semiquantitative revelation of the remarkable interplay between their morphology and unique plasmonic properties. 相似文献
933.
Highly Active Bidirectional Electron Transfer by a Self‐Assembled Electroactive Reduced‐Graphene‐Oxide‐Hybridized Biofilm 下载免费PDF全文
Prof. Yang‐Chun Yong Yang‐Yang Yu Prof. Xinhai Zhang Prof. Hao Song 《Angewandte Chemie (International ed. in English)》2014,53(17):4480-4483
Low extracellular electron transfer performance is often a bottleneck in developing high‐performance bioelectrochemical systems. Herein, we show that the self‐assembly of graphene oxide and Shewanella oneidensis MR‐1 formed an electroactive, reduced‐graphene‐oxide‐hybridized, three‐dimensional macroporous biofilm, which enabled highly efficient bidirectional electron transfers between Shewanella and electrodes owing to high biomass incorporation and enhanced direct contact‐based extracellular electron transfer. This 3D electroactive biofilm delivered a 25‐fold increase in the outward current (oxidation current, electron flux from bacteria to electrodes) and 74‐fold increase in the inward current (reduction current, electron flux from electrodes to bacteria) over that of the naturally occurring biofilms. 相似文献
934.
Dr. Ryo Tsunashima Yoshifumi Iwamoto Yusuke Baba Chisato Kato Katsuya Ichihashi Dr. Sadafumi Nishihara Prof. Katsuya Inoue Prof. Katsuya Ishiguro Prof. Yu‐Fei Song Prof. Tomoyuki Akutagawa 《Angewandte Chemie (International ed. in English)》2014,53(42):11228-11231
In a mixed‐valence polyoxometalate, electrons are usually delocalized within the cluster anion because of low level of inter‐cluster interaction. Herein, we report the structure and electrical properties of a single crystal in which mixed‐valence polyoxometalates were electrically wired by cationic π‐molecules of tetrathiafulvalene substituted with pyridinium. Electron‐transport characteristics are suggested to represent electron hopping through strong interactions between cluster and cationic π‐molecules. 相似文献
935.
β‐Functionalization of Carboxylic Anhydrides with β‐Alkyl Substituents through Carbene Organocatalysis 下载免费PDF全文
Zhichao Jin Shaojin Chen Yuhuang Wang Pengcheng Zheng Prof. Dr. Song Yang Prof. Dr. Yonggui Robin Chi 《Angewandte Chemie (International ed. in English)》2014,53(49):13506-13509
The first NHC‐catalyzed functionalization of carboxylic anhydrides is described. In this reaction, the β carbon behaves as a nucleophilic carbon and undergoes asymmetric reactions with electrophiles. Anhydrides with challenging β‐alkyl substituents work effectively. 相似文献
936.
Back Cover: Surface Polarization Matters: Enhancing the Hydrogen‐Evolution Reaction by Shrinking Pt Shells in Pt–Pd–Graphene Stack Structures (Angew. Chem. Int. Ed. 45/2014) 下载免费PDF全文
937.
Nickel‐Catalyzed C?H Alkylations: Direct Secondary Alkylations and Trifluoroethylations of Arenes 下载免费PDF全文
Weifeng Song Sebastian Lackner Lutz Ackermann 《Angewandte Chemie (International ed. in English)》2014,53(9):2477-2480
A versatile nickel catalyst allowed for C H alkylations of unactivated arenes with challenging secondary alkyl bromides and chlorides. The high catalytic efficacy also set the stage for direct secondary alkylations of indoles as well as C H trifluoroethylations with ample substrate scope. 相似文献
938.
Joseph J. Chen Dr. Martin Hürlimann Dr. Jeffrey Paulsen Dr. Denise Freed Dr. Soumyajit Mandal Dr. Yi‐Qiao Song 《Chemphyschem》2014,15(13):2676-2681
Crude oils, which are complex mixtures of hydrocarbons, can be characterized by nuclear magnetic resonace diffusion and relaxation methods to yield physical properties and chemical compositions. In particular, the field dependence, or dispersion, of T1 relaxation can be used to investigate the presence and dynamics of asphaltenes, the large molecules primarily responsible for the high viscosity in heavy crudes. However, the T2 relaxation dispersion of crude oils, which provides additional insight when measured alongside T1, has yet to be investigated systematically. Here we present the field dependence of T1‐T2 correlations of several crude oils with disparate densities. While asphaltene and resin‐containing crude oils exhibit significant T1 dispersion, minimal T2 dispersion is seen in all oils. This contrasting behavior between T1 and T2 cannot result from random molecular motions, and thus, we attribute our dispersion results to highly correlated molecular dynamics in asphaltene‐containing crude oils. 相似文献
939.
Jun Myung Kim So Hyeong Sohn Noh Soo Han Prof. Seung Min Park Prof. Joohoon Kim Prof. Jae Kyu Song 《Chemphyschem》2014,15(14):2917-2921
Direct evidence for the blue luminescence of gold nanoclusters encapsulated inside hydroxyl‐terminated polyamidoamine (PAMAM) dendrimers was provided by spectroscopic studies as well as by theoretical calculations. Steady‐state and time‐resolved spectroscopic studies showed that the luminescence of the gold nanoclusters consisted largely of two electronic transitions. Theoretical calculations indicate that the two transitions are attributed to the different sizes of the gold nanoclusters (Au8 and Au13). The luminescence of the gold nanoclusters was clearly distinguished from that of the dendrimers. 相似文献
940.
Gold nanoparticles by using the mixture of polystyrene-block-poly(2-vinyl pyridine)/poly(2-vinyl pyridine)-block-poly(ethylene oxide) (PS-b-P2VP/P2VP-b-PEO) block copolymers as encapsulating agent was prepared. The prepared nanoparticles were characterized by transmission electron microscopy, UV-Vis spectroscopy and contact angle. It is demonstrated that the obtained gold nanoparticles are covered with mixed block copolymer shells. The hydrophilic property of the nanoparticles can be varied by the change of the dispersion medium. The obtained gold nanoparticles with mixed block copolymer shells are stable in organic solvents (such as tetrahydrofuran and toluene) and water. 相似文献