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991.
Jingen Wang Xihe Huang Changcang Huang Haiyan Song Duoping Yang 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(12):m583-m585
In the title complex, poly[triaquabis(dimethylformamide)di‐μ3‐oxalato‐μ2‐oxalato‐dilanthanum(III)], [La2(C2O4)3(C3H7NO)(H2O)3]n, both La ions are coordinated by nine O atoms, forming slightly distorted tricapped trigonal prisms. The two La ions, the terminal water O atom, and the O and N atoms of the dimethylformamide molecule reside on twofold rotation axes, giving the two La‐centered coordination geometries twofold or pseudo‐twofold symmetries. The two oxalate ligands, one of which rests on a center of inversion at the mid‐point of the C—C bond, adopt different bridging modes, connecting with the La ions to form two types of lanthanide oxalate chains, i.e. anionic {[La(C2O4)2(DMF)(H2O)2]n−}n (DMF is dimethylformamide) and cationic zigzag {[La(C2O4)(H2O)]n+}n, respectively. Each zigzag cationic chain is linked to four adjacent anionic chains via the bridging oxalate anions, and each anionic chain connects with four zigzag cationic chains, constructing a three‐dimensional neutral framework. 相似文献
992.
氯化聚乙烯弹性体的固相法合成 总被引:2,自引:0,他引:2
讨论了以固相法合成氯化聚乙烯(CPE)弹性体的过程.实验结果表明,以固相氯化反应所得的CPE,其大分子链上Cl取代基的分布比水相悬浮法更均匀.氯化过程的温度直接影响氯化速度及分子结构,如残留结晶、氯分布等.而聚乙烯颗粒表面与内部的氯化程度取决于氯化速度.大分子链上Cl取代基对邻近基团的氯化起阻碍作用 相似文献
993.
Preparative isolation and purification of lutein from the microalga chlorella vulgaris by high-speed counter-current chromatography 总被引:6,自引:0,他引:6
High-speed counter-current chromatography (HSCCC) was applied to the isolation and purification of lutein from microalgae. Analytical HSCCC was used for the preliminary selection of a suitable solvent system composed of n-hexane-ethanol-water (4:3:1, v/v). Using the above solvent system, preparative HSCCC was successfully performed yielding lutein at 98% purity from 200 mg of the crude extract in a one-step separation. 相似文献
994.
Ohsaka T Tian Y Shioda M Kasahara S Okajima T 《Chemical communications (Cambridge, England)》2002,(9):990-991
A superoxide dismutase (SOD)-modified electrode, in which SOD is oriented on the gold electrode via a self-assembled monolayer of cysteine so as to allow its direct electrode reaction, possesses a bi-directional electrocatalysis for both the oxidation of superoxide ion (O2-) to O2 and the reduction of O2- to H2O2 and functions as a third generation O2- biosensor. 相似文献
995.
S. E. Campbell H. Yang R. Patel S. E. Friberg P. A. Aikens 《Colloid and polymer science》1997,275(3):303-306
The kinetics of vesicle formation from a hydrotrope (sodium xylenesulfonate) solution of a surfactant (Laureth 4) is studied
by the use of a stopped-flow apparatus combined with a dynamic light scattering device to determine vesicle size in the system.
The hydrotrope system studied presents a system with a high surfactant solubilization combined with vesicle formation simply
by dilution with water. The kinetic results show a single exponential decay time. The kinetic analysis indicates that the
vesicles are formed from a molecular solution which resulted from the shear in the stopped-flow device and grow by monomeric
association.
Received: 1 October 1996 Accepted: 22 November 1996 相似文献
996.
pH-sensitive polyelectrolyte complex gel microspheres composed of chitosan/sodium tripolyphosphate/dextran sulfate: swelling kinetics and drug delivery properties 总被引:10,自引:0,他引:10
Porous chitosan (CS) polyelectrolyte complex (PEC) hydrogel microspheres were prepared via either wet phase-inversion or ionotropic crosslinking with sodium tripolyphosphate (Na+ - TPP) and dextran sulfate (DS). The resulting microspheres were characterized using scanning electron microscopy (SEM) and elemental analysis (EA). The controlled release behavior of ibuprofen (IBU) from these microspheres was investigated. The PEC microspheres were about 700-950 microm in diameter with large pores and open porous structure. The CS/TPP/DS microspheres resisted hydrolysis in strong acid and biodegradation in enzymatic surroundings. The swelling kinetics for CS microspheres was close to Fickian diffusion, whereas those for CS/TPP and CS/TPP/DS were non-Fickian. Furthermore, the equilibrium water content (EWC) and water diffusion coefficient (D) increased with the pH of the media. The release profiles of IBU from CS/TPP/DS microspheres were slow in simulated gastric fluid (SGF, pH 1.4) over 3 h, but nearly all of the initial drug content was released in simulated intestinal fluid (SIF, pH 6.8) within 6 h after changing media. Overall the results demonstrated that CS/TPP/DS microspheres could successfully deliver a hydrophobic drug to the intestine without losing the drug in the stomach, and hence could be potential candidates as an orally administered drug delivery system. 相似文献
997.
Threshold collision-induced dissociation techniques are employed to determine bond dissociation energies (BDEs) of mono- and bis-complexes of alkali metal cations, Li+, Na+, K+, Rb+, and Cs+, with indole, C8H7N. The primary and lowest energy dissociation pathway in all cases is endothermic loss of an intact indole ligand. Sequential loss of a second indole ligand is observed at elevated energies for the bis-complexes. Density functional theory calculations at the B3LYP/6-31G level of theory are used to determine the structures, vibrational frequencies, and rotational constants of these complexes. Theoretical BDEs are determined from single point energy calculations at the MP2(full)/6-311+G(2d,2p) level using the B3LYP/6-31G* geometries. The agreement between theory and experiment is very good for all complexes except Li+ (C8H7N), where theory underestimates the strength of the binding. The trends in the BDEs of these alkali metal cation-indole complexes are compared with the analogous benzene and naphthalene complexes to examine the influence of the extended pi network and heteroatom on the strength of the cation-pi interaction. The Na+ and K+ binding affinities of benzene, phenol, and indole are also compared to those of the aromatic amino acids, phenylalanine, tyrosine, and tryptophan to elucidate the factors that contribute to the binding in complexes to the aromatic amino acids. The nature of the binding and trends in the BDEs of cation-pi complexes between alkali metal cations and benzene, phenol, and indole are examined to help understand nature's preference for engaging tryptophan over phenylalanine and tyrosine in cation-pi interactions in biological systems. 相似文献
998.
Jun?ZhangEmail author Pei-Hong?Deng Yong-Lan?Feng Yun-Fei?Kuang Jin-Jun?Yang 《Mikrochimica acta》2004,147(4):279-282
A carbon black microelectrode modified by -MnO2 has been prepared. The electrocatalytical oxidation of ascorbic acid (AA) at this microelectrode was investigated. The 2nd-order linear scan voltammograms of AA are recorded from –0.5 to 0.5V (vs. SCE). The relationship between the oxidation peak current of AA and its concentration in the range of 1.0×10–64.0×10–3molL–1 is linear. The detection limit (3) was found to be 6.0×10–7molL–1. Also, the determination of AA in samples is evaluated, and the results are satisfactory. 相似文献
999.
Shie-Shien Yang 《Annals of the Institute of Statistical Mathematics》1981,33(1):463-470
Summary Let (X
1,Y
1), (X
2,Y
2),…, (X
n,Y
n) be i.i.d. as (X, Y). TheY-variate paired with therth orderedX-variateX
rn is denoted byY
rn and terms the concomitant of therth order statistic. Statistics of the form
are considered. The asymptotic normality ofT
n is established. The asymptotic results are used to test univariate and bivariate normality, to test independence and linearity
ofX andY, and to estimate regression coefficient based on complete and censored samples. 相似文献
1000.