全文获取类型
收费全文 | 8603篇 |
免费 | 1102篇 |
国内免费 | 1819篇 |
专业分类
化学 | 9568篇 |
晶体学 | 97篇 |
力学 | 87篇 |
综合类 | 92篇 |
数学 | 16篇 |
物理学 | 1664篇 |
出版年
2024年 | 44篇 |
2023年 | 148篇 |
2022年 | 366篇 |
2021年 | 356篇 |
2020年 | 438篇 |
2019年 | 374篇 |
2018年 | 311篇 |
2017年 | 313篇 |
2016年 | 437篇 |
2015年 | 386篇 |
2014年 | 375篇 |
2013年 | 877篇 |
2012年 | 545篇 |
2011年 | 499篇 |
2010年 | 426篇 |
2009年 | 498篇 |
2008年 | 460篇 |
2007年 | 543篇 |
2006年 | 458篇 |
2005年 | 478篇 |
2004年 | 428篇 |
2003年 | 373篇 |
2002年 | 338篇 |
2001年 | 237篇 |
2000年 | 250篇 |
1999年 | 218篇 |
1998年 | 191篇 |
1997年 | 171篇 |
1996年 | 180篇 |
1995年 | 153篇 |
1994年 | 106篇 |
1993年 | 103篇 |
1992年 | 92篇 |
1991年 | 59篇 |
1990年 | 38篇 |
1989年 | 32篇 |
1988年 | 40篇 |
1987年 | 22篇 |
1986年 | 22篇 |
1985年 | 26篇 |
1984年 | 18篇 |
1983年 | 14篇 |
1982年 | 15篇 |
1981年 | 15篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 3篇 |
1975年 | 7篇 |
1974年 | 7篇 |
1973年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
在0.004mol/L HCl-1×10^-3mol/L SCN^--5×10^-5mol/L磷酸三丁酯(TBP)溶液中,Cu^2+可在-0.42V(vs.SCE)产生灵敏的极谱波,波高较无TBP存在时增加近3倍,二阶导数峰电流与0.005 ̄4.0mg/L Cu^2+呈线性关系。研究了极谱波性质及增敏机理,表明该极谱波为配合物吸附波,TBP起协同吸附作用。本法已用于实际样品分析,结果满意。 相似文献
82.
Rao DP Sivakumar SV Mandal S Kota S Ramaprasad BS 《Journal of chromatography. A》2005,1069(1):141-151
The separation of propylene-propane mixture is an energy intensive operation commercially practiced using cryogenic distillation. The separation by pressure swing adsorption has been studied as an alternative. A fixed-bed pressure swing adsorption yields the heavy component as a pure product. The product recovery and the productivity are not high. In a moving-bed process, because of the counter-current solid-gas contact, the separation achieved is similar to that of the fractionation by distillation. Although the moving-bed operation offers the upper limit for the performance of a cyclic adsorptive process, due to mechanical complexities in the handling of solids the 'simulated' moving-bed is preferred. By moving the inlet and outlet ports of streams located along the length of the bed, a moving-bed process can be realized in a fixed bed. We describe here a 'moving-port' system which permits injection or withdrawal of the fluid along the axial direction in a fixed bed. A fixed bed embedded with the moving-port systems emulates a simulated moving-bed adsorber. The proposed adsorber can fractionate a binary gas mixture into two product streams with high purities. It is similar to the Sorbex process of UOP but does not have the eluent as an additional separating agent. A parametric study indicates that high purity products and a higher productivity by an order of magnitude can be achieved with simulated moving-beds compared to the fixed beds. 相似文献
83.
Diamy A.-M. Hochard L. Legrand J.-C. Ricard A. 《Plasma Chemistry and Plasma Processing》1998,18(4):447-460
Measurements of nitrogen atom density, by means of NO chemical titration, along with an evaluation of the densities of some excited species N
2
(B, v=11), N
2
(B, v=2), N
2
(C, v=0), and N
2
+
(B,v=0), by means of a spectroscopic study of some bands of dinitrogen, are achieved along the flowing afterglow of a dinitrogen microwave plasma (2450 MHz) for several pressures. The concentrations obtained are in the following range: [N]10
+15
, [N
2
(B, 2)]10
+9
–10
+10
, [N
2
(B, 11)]10
+8
–10
+9
, [N
2
(C, 0)]10
+6
–10
+7
, [N
2
+
(B,0)]10
+6
-10
+8
(cm-3). From a kinetic study of the formation and decay of excited and charged species, an estimation of N
2
(A, v), N
2
(X, v, and N
2
+
(X) densities can be derived: [N
2
(A, v)]10
+12
, [N
2
(X, v6)]10
+15
–10
+16
, [N
2
(X, v12)]10
+14
–10
+15
, [N
2
+
(X)]10
+10
(cm
-3
). 相似文献
84.
Hae‐Jeong Lee Christopher L. Soles Da‐Wei Liu Barry J. Bauer Wen‐Li Wu 《Journal of Polymer Science.Polymer Physics》2002,40(19):2170-2177
X‐ray reflectivity has been used to determine the mass uptake of probe molecules in porous thin films supported on thick silicon wafers. The adsorption occurs by capillary condensation when the films are exposed to probe vapor at controlled partial vapor pressures. The probe solvent partial pressure was varied by mixing saturated air and dry air at constant temperature or by changing sample temperature at a constant vapor concentration. Pore size distribution in the films can be calculated from the probe uptake with typical porosimetric approaches such as the application of the Kelvin equation to convert partial pressure into pore size. For illustration, the pore size distribution of three different nanoporous thin films, the primary candidate of ultra‐low‐k interlevel dielectrics in the next generation of integrated circuit chips, was determined with this technique. These samples represent different generations of low‐k dielectrics developed by industry. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 2170–2177, 2002 相似文献
85.
V. Chaplain M. L. Janex F. Lafuma C. Graillat R. Audebert 《Colloid and polymer science》1995,273(10):984-993
Studies of the adsorption of high molecular weight polymers on colloidal latex and silica particles and their subsequent flocculation were carried out. Neutral polyethylene oxide samples with both a narrow and a broad molecular weight distribution were used together with low charged cationic copolymers. The influence of the particle concentration and polymer dose on the flocculation were systematically investigated under quiescent conditions.Equilibrium bridging only occurred with polyelectrolyte, even in very dilute suspensions, at high particle coverage. In contrast to this, non-equilibrium bridging occurred with both neutral polymer and polyelectrolytes but only for more concentrated suspensions and small amounts of adsorbed polymer. Polymer adsorption in dilute suspensions, which did not show particle aggregation was measured an electrophoretic technique. In more concentrated suspensions, where flocculation takes place, we found that aggregation prevents further polymer adsorption and induces both an excluded volume and a surface effect. The consequences on the shape of the isotherms differ according to the aggregation mechanism.A significant decrease of the amount, , of adsorbed polymer is observed with non-equilibrium bridging. When both mechanisms simultaneously contribute to the aggregation, the value of depends on their relative importance. In the intermediate range of copolymer dose their respective contributions are critically sensitive to the details of the mixing step and stirring, leading to non reproducible experimental results. 相似文献
86.
87.
One novel complex [Co(p-MBA)2(2,2'-bipy)(H2O)]·(H2O) has been synthesized by the reaction of p-methylbenzoic acid with 2,2'-bipyridine in the solvent mixture of water and methanol. It crystallizes in triclinic, space group P-1 with a=0.70479(14), b=1.1211(2), c=1.6718(3) nm, α=103.806(3), β=90.795(3), γ=104.207(3)°, V=1.2399(4) nm3, Mr=512.41, Dc=1.373 g/cm3, Z=2, F(000)=532, μ=0.733 mm-1, R=0.0432 and wR=0.0957. The crystal structural analysis shows that the cobalt atom is coordinated with three oxygen atoms from two p-methylbenzoic acids and one water molecule and two nitrogen atoms from one 2,2'-bipyridine,forming a distorted square-pyramidal coordination geometry. The cyclic voltammetry behavior of the complex is also reported. 相似文献
88.
89.
V. A. Livshits B. G. Dzikovskii V. P. Tsybyshev B. B. Meshkov 《Russian Chemical Bulletin》1996,45(7):1563-1571
Isotherms of the binding of dodecyl sulfate anions (DDS–)and Na+ counterions during their coadsorption with a nonionic polymer. proxanol (PR). at the interface of dodecane-water emulsions have been measured by conductometry and Na-selective potentiometry. The adsorption of DDS– and PR is concurrent. The affinity constant of PR to the interface determined by the Langmuir model decreases as the concentration of PR increases, and the surface concentration of DDS– tends to a nonzero limiting value at high concentrations of PR. The surface (o) and electrokinetic () potentials at the interface have been determined at various polymer concentrations by the spin probe and electrophoresis methods. The average dielectric permeability and density of polymer segments in We adsorption layer have been determined by ESR. The lower boundary of the hydrodynamic thickness of the polymer adsorption layer at the interface has been estimated from the dependences of o and on the ionic strength.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1653–1661, July, 1996. 相似文献
90.