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91.
92.
Xin Ying ZHANG Xue Sen FAN Hong Ying NIU Jian Ji WANGSchool of Chemical Environmental Sciences Henan Normal University Key Laboratory ofEnvironmental Science Engineering of Henan Education Department Xinxiang 《中国化学快报》2003,(10)
a, a'-Bis(substituted benzylidene)cycloalkanones were efficiently prepared from cycloalkanones and benzaldehydes in [bmim][BF4] by using iron(III) chloride hexahydrate as a catalyst. It is shown that [bmim][BF4] and iron(III) chloride hexahydrate can be quantitatively recovered and be reused effectively for many times. Compared with the known methods, this novel process has the advantage of being an envkonmentally benign process together with good yields and mild reaction conditions. 相似文献
93.
Spectroscopy Investigation on Conformational Transition of Tea Glycoconjugate from Green Tea 总被引:5,自引:0,他引:5
The conformational transition of a new glycoconjugate, tea glycoconjugate (TGC), was investigated by spectroscopy techniques including circular dichroism (CD) and ultraviolet (UV) spectroscopy. The solution behaviors of TGC in the mediums of different temperature, pH value, and ions were compared. Results showed that the native conformation of TGC was partially ordered. The CD value and UV absorbance of TGC altered with the change of pH value, temperature, the addition of ions, and also accompanied order-disorder transition. Especially the conditions with temperature higher than the glass transition temperature (Tg=62℃), higher pH value or lower pH value will have the most impact on the conformation of TGC, which will destroy the hydrogen bonds between the TGC molecules. The results indicated that the outside factors play important roles on the stability of the conformation of TGC. 相似文献
94.
The multi-component isotherms for human insulin (HI) and desamido human insulin (dHI) over reversed phase packing (C18) and with 29.8% (w/w) ethanol-water as mobile phase have been determined experimentally. The isotherms of HI in ethanol-water differ from those obtained with the more commonly applied methanol-water and acetonitrile-water mobile phase, as described in this paper. The isotherm exhibits anti Langmuirian behavior and can be very well modeled by an anti Langmuir isotherm presented in this paper. The HI and dHI anti Langmuir isotherm are determined as: qHI = (8.4C(HI) + 3C(HI)CdHI)/(1 - 0.05C(HI) - 0.14CdHI + 0.04C(HI)CdHI) and qdHI = (11.4CdHI + 2C(HI)CdHI)/ (1 - 0.05C(HI) - 0.14CdHI + 0.04C(HI)CdHI) 相似文献
95.
This paper introduces a method of combining open and closed microchannels in a single component in a novel way which couples the benefits of both open and closed microfluidic systems and introduces interesting on-chip microfluidic behaviour. Fluid behaviour in such a component, based on continuous pressure driven flow and surface tension, is discussed in terms of cross sectional flow behaviour, robustness, flow-pressure performance, and its application to microfluidic interfacing. The closed-open-closed microchannel possesses the versatility of upstream and downstream closed microfluidics along with open fluidic direct access. The device has the advantage of eliminating gas bubbles present upstream when these enter the open channel section. The unique behaviour of this device opens the door to applications including direct liquid sample interfacing without the need for additional and bulky sample tubing. 相似文献
96.
研究了酚醛型吸附树脂在水体系中对吡啶和N,N-二甲基苯胺的静态和动态吸附行为.结果表明,在水中树脂对吡啶和N,N-二甲基苯胺的吸附主要以疏水吸附机理进行;吸附吡啶和N.N-二甲基苯胺的初始阶段,即达到38.3~48.9%平衡吸附时,吸附速率数据和半经验速率方程很吻合:酚醛型吸附树脂等温吸附吡啶和N,N-二甲基苯胺的平衡吸附数据符合Langmuir方程,相关系数在0.99以上,酚醛型吸附树脂吸附吡啶和N,N-二甲基苯胺属单分子层吸附:用80%的乙醇溶液作洗脱剂来洗脱吸附吡啶已达饱和的JDW-2树脂,效果是很理想的.在3.6个床体积内洗脱率达91.52%,4.8个床体积内洗脱率达到94.85%。表明酚醛型吸附树脂具有优良的洗脱性能. 相似文献
97.
铁基超细粒子催化剂具有优良的F-T反应性能。本工作利用原位Mssbauer谱辅以XRD技术研究了含有钾助剂的F-T合成铁基超细粒子催化剂的结构与还原行为,考察了催化剂组成和第二金属组分(Mn,Zn,Mg)的影响。“纯”铁超细粒子催化剂在氢气中很容易经Fe_3O_4还原为零价铁。第二金属组分的引入,一方面阻碍了催化剂的还原,另一方面稳定了Fe~(2+)的存在而使其成为还原的主要中间相,这有利于反应条件下形成类尖晶石结构的活性相。对于Fe-Mn催化剂,上述效应随锰含量的增加而更趋显著。铁基超细粒子催化剂在氢气中的还原能力依“纯”Fe>Fe-Zn>Fe-Mn>Fe-Mg的顺序递减,这在一定程度上反映了铁与第二金属组分之间相互作用的强弱。 相似文献
98.
For investigations of adsorption of polymers onto surfaces, lysine oligomers of defined lengths were synthesized using standard methods of peptide chemistry. By repeated coupling of peptide derivatives of the same length, peptide chains up to 32 lysine residues were obtained. To suppress end effects theN-terminalα-amino group and the carboxyl group of each peptide were blocked with?-aminocaproyl- andN-methylamide functions respectively. Measurements of the optical rotation of blocked and charged deblocked oligo-L-lysines indicated that ordered structures are present in both forms. 相似文献
99.
耐硫催化剂上合成混合醇的研究 总被引:2,自引:1,他引:2
通过改进制备方法和添加助剂,用浸渍-热分解法制得了具有高活性和高选择性的MoS2-K-C型耐硫低碳混合醇催化剂。在8.0-11.0MPa,290-340℃,6000-12000h^-1,H2 S 浓度为100ppm 左右的条件下,在直流反应器中对催化剂进行了性能测试,结果表明,醇得率为0.14-0.47gROH(gcat·h)^-1,选择性为89-98%。同时,考察了操作条件对催化剂性能的影响。1042h的试验,证明催化剂具有很好的稳定性。 相似文献
100.
Qin W Baruah M Van der Auweraer M De Schryver FC Boens N 《The journal of physical chemistry. A》2005,109(33):7371-7384
The photophysical properties of seven new 8-(p-substituted)phenyl analogues of 4,4-difluoro-3,5-dimethyl-8-(aryl)-4-bora-3a,4a-diaza-s-indacene (derivatives of the well-known fluorophore BODIPY) in several solvents have been studied by means of absorption and steady-state and time-resolved fluorimetry. For each compound, the fluorescence quantum yield and lifetime are lower in solvents with higher polarity owing to an increase in the rate of nonradiative deactivation. Increasing the electron withdrawing strength of the p-substituent on the phenyl group in position 8 also leads to lower fluorescence quantum yields and lifetimes. When the p-substituent on the phenyl group in position 8 is a tertiary amine [8-(4-piperidinophenyl), 8-(4-N,N-dimethylaminophenyl), and 8-(4-morpholinophenyl)], the low quantum yields of these compounds in more polar solvents can be rationalized by the inversion of the energy levels of an apolar, highly fluorescent and a polar, nonfluorescent excited state, where charge transfer from the tertiary amine to the BODIPY unit occurs. These amine analogues can be protonated at low pH in aqueous solution. Fluorescence titrations yielded pK(a) values of their conjugate ammonium salts which are in agreement with the electron donating tendency of the amine group: piperidino (4.15) > dimethylamino (2.37) > morpholino (1.47), with the pK(a) values in parentheses. The rate constant of radiative deactivation (k(f)) is the same for all compounds in all solvents studied (k(f) = 1.4 x 10(8) s(-1)). 相似文献