首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8610篇
  免费   710篇
  国内免费   798篇
化学   5652篇
晶体学   58篇
力学   507篇
综合类   66篇
数学   837篇
物理学   2998篇
  2025年   11篇
  2024年   84篇
  2023年   155篇
  2022年   254篇
  2021年   339篇
  2020年   358篇
  2019年   363篇
  2018年   214篇
  2017年   211篇
  2016年   333篇
  2015年   365篇
  2014年   382篇
  2013年   502篇
  2012年   604篇
  2011年   692篇
  2010年   439篇
  2009年   428篇
  2008年   494篇
  2007年   433篇
  2006年   422篇
  2005年   410篇
  2004年   292篇
  2003年   254篇
  2002年   260篇
  2001年   222篇
  2000年   169篇
  1999年   163篇
  1998年   154篇
  1997年   133篇
  1996年   138篇
  1995年   152篇
  1994年   119篇
  1993年   109篇
  1992年   73篇
  1991年   98篇
  1990年   60篇
  1989年   61篇
  1988年   49篇
  1987年   31篇
  1986年   23篇
  1985年   19篇
  1984年   11篇
  1983年   12篇
  1982年   13篇
  1981年   5篇
  1980年   1篇
  1979年   1篇
  1976年   1篇
  1966年   1篇
  1957年   1篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
富勒烯[60]的光化学反应研究   总被引:1,自引:0,他引:1  
从光物理出发,综述了近几年富勒烯「60」的光化学反应研究进展。C60能发生诸多的光化学反应:(1)光氧化;(2)光氢化还原;(3)「2+2」光环化加成;(4)与叔胺的光加成;(5)与氨基酸的光加成;(6)与金属有机化合物的光加成。  相似文献   
52.
利用热重分析及原位红外光谱等方法,定性、定量地研究了三价铬和丙二酸形成的配合物[Cr(C3H2O4)(H2O)][Cr(C3H2O4)2(H2O)2]·4H2O的热解过程,提出了室温至400℃下的详细热解途径.基于多种实验结果,分析了螯合物中六员环的化学键断裂方式,并由配合物的快原子轰击质谱(FAB-MS)加以佐证.  相似文献   
53.
A simple method is presented for the simultaneous differential pulse voltammetric determination of uric acid, xanthine and hypoxanthine. It is based on the improved current responses of the three analytes at carbon paste electrodes polarized in a dilute alkaline medium (0.002 mol/l NaOH, 0.1 mol/l NaClO4) at 1.3 V vs. SCE for a short time. Compared with the methods reported in the literature, this procedure has a much wider linear range (2 to 3 orders of magnitude in concentration), lower detection limits (5 to 10 g l–1) and less interference by ascorbic acid. The electrochemical responses were found to be dependent on the pre-anodization potential and the time imposed on the electrodes as well as on the alkalinity of the supporting electrolyte. The proposed procedure was used to determine uric acid, xanthine and hypoxanthine in human urine without any preliminary treatment.  相似文献   
54.
55.
    
The design and synthesis of organic materials with a narrow emission band in the longer wavelength region beyond 510 nm remain a great challenge. For constructing narrowband green emitters, we propose a unique molecular design strategy based on frontier molecular orbital engineering (FMOE), which can integrate the advantages of a twisted donor–acceptor (D-A) structure and a multiple resonance (MR) delayed fluorescence skeleton. Attaching an auxiliary donor to a MR skeleton leads to a novel molecule with twisted D-A and MR structure characteristics. Importantly, a remarkable red-shift of the emission maximum and a narrowband spectrum are achieved simultaneously. The target molecule has been employed as an emitter to fabricate green organic light-emitting diodes (OLEDs) with Commission Internationale de L'Eclairage (CIE) coordinates of (0.23, 0.69) and a maximum external quantum efficiency (EQE) of 27.0 %.  相似文献   
56.
    
A key issue of micro/nano devices is how to integrate micro/nanostructures with specified chemical components onto various curved surfaces. Hydrodynamic printing of micro/nanostructures on three-dimensional curved surfaces is achieved with a strategy that combines template-induced hydrodynamic printing and self-assembly of nanoparticles (NPs). Non-lithography flexible wall-shaped templates are replicated with microscale features by dicing a trench-shaped silicon wafer. Arising from the capillary pumped function between the template and curved substrates, NPs in the colloidal suspension self-assemble into close-packed micro/nanostructures without a gravity effect. Theoretical analysis with the lattice Boltzmann model reveals the fundamental principles of the hydrodynamic assembly process. Spiral linear structures achieved by two kinds of fluorescent NPs show non-interfering photoluminescence properties, while the waveguide and photoluminescence are confirmed in 3D curved space. The printed multiconstituent micro/nanostructures with single-NP resolution may serve as a general platform for optoelectronics beyond flat surfaces.  相似文献   
57.
    
We report here a guest-reaction-induced mitosis-like host transformation from a known Pd4L2 cage 1 to a conjoined Pd6L3 twin-cage 2 featuring two separate cavities. The encapsulation of 1-hydroxymethyl-2-naphthol ( G1 ), a known ortho-quinone methide (o-QMs) precursor, within the hydrophobic cavity of cage 1 is found crucial to realize the cage to twin-cage conversion. Confined G1 molecules within the nanocavity undergo self-coupling dimerization reaction to form 2,2′-dihydroxy-1,1′-dinaphthylmethane ( G2 ) which then triggers the cage to twin-cage mitosis. The same conversion also proceeds, in a much faster rate, via the direct templation of G2 , confirming the induced-fit transformation mechanism. The structure of the ( G2 )2⊂ 2 host–guest complex has been established by X-ray crystallographic study, where cis- to trans- conformational switch on one bridging ligand is revealed.  相似文献   
58.
    
Aluminosilicate boggsite (Si/Al-BOG) has been hydrothermally synthesized without adding organic structure-directing agents (OSDAs) in the synthesis gel using the borosilicogermanium ITQ-47 (Si/B-ITQ-47) zeolite as seeds. The introduction of the costly and environmentally less benign phosphazene organic structure-directing agent is not required to grow the zeolite. Physicochemical characterization experiments show that Si/Al-BOG has good crystallinity, high surface area, tetrahedral Al3+ species, and acid sites. In order to test the catalytic performance of the zeolite, the synthesis of l,l-lactide from l-lactic acid was performed. Si/Al-BOG exhibits 88.2% conversion of l-lactic acid and 83.8% l,l-lactide selectivity, which are better than those of other zeolites studied up to now.

Aluminosilicate boggsite (Si/Al-BOG) has been hydrothermally synthesized without adding organic structure-directing agents (OSDAs) in the synthesis gel using the borosilicogermanium ITQ-47 (Si/B-ITQ-47) zeolite as seeds.  相似文献   
59.
Ruthenium shows promise for use as a chemical modifier for the determination of ultratrace quantities of lead in solution when compared with the popular and widely used palladium. There is experimental evidence that ruthenium reacts with lead in the graphite tube to form the intermetallic compound PbRu2. The amount of ruthenium had a dramatic effect on the absorbance profile for the lead signal.  相似文献   
60.
A synthetical equation is proposed to characterize the essential features of the inverse “S” type curve on the basis of summing-up simulation approach of “S” type curve. The two physical variables in the model obtained are discussed and the detailed method used to determine the parameters is given. The model is then presented to describe the crystallization of poly(caryleher ether ketone) (PEEK) and thermal decomposition of poly(amide-imide) (PAI) respectively. It is found that some thermal characteristic parameters can be well estimated from the model simu-lated in computer.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号