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241.
David Dos Santos Ferreira Carlos E. Kenig Mikko Salo Gunther Uhlmann 《Inventiones Mathematicae》2009,178(1):119-171
In this article we consider the anisotropic Calderón problem and related inverse problems. The approach is based on limiting
Carleman weights, introduced in Kenig et al. (Ann. Math. 165:567–591, 2007) in the Euclidean case. We characterize those Riemannian manifolds which admit limiting Carleman weights, and give a complex
geometrical optics construction for a class of such manifolds. This is used to prove uniqueness results for anisotropic inverse
problems, via the attenuated geodesic ray transform. Earlier results in dimension n≥3 were restricted to real-analytic metrics. 相似文献
242.
Poly(ethylene glycol) (PEG) triblock and diblock amphiphilic block copolymers were synthesized from poly(ethylene glycol) and poly(ethylene glycol) monomethyl ether, respectively. The hydroxyl groups of PEG readily react with 2-(1-octadecenyl) succinic anhydride (OSA) at 140 °C through ring-opening reaction of the succinic anhydride. Both the PEG-OSA diblock and triblock copolymers are produced without use of any solvent or catalyst. The molecular structure of the copolymers was characterized by 1H NMR and FTIR spectroscopy, and the thermal properties by DSC. The behavior of the copolymers in selective and nonselective solvents was studied by 1H NMR spectroscopy in deuterium oxide and d-chloroform. The aggregation of the polymers in water was studied with a particle size analyzer and a transmission electron microscope (TEM) in bright field mode. The results show that the hydrophobic C18 chain with intramolecular succinic anhydride linker can be attached to the hydrophilic PEG chain, an ester bond forming between the blocks. The copolymers exhibit flexible, liquid-like hydrophobic blocks even in water, which is a nonsolvent for OSA. PEG-OSA block copolymers self-organize in water, forming micellar polymer aggregates in nanoscale. 相似文献
243.
Summary The high-performance liquid chromatographic (HPLC) method herein described allows the simultaneous determination of the hydrolysis kinetics of tinidazole and the formation kinetics of the hydrolysis products. Tinidazole is easily hydrolysed under basic conditions at raised temperature. The rate varies with the pH and the temperature of the solution, and the decomposition follows apparent first-order kinetics. The Arrheinius equation can be used to describe the effect of temperature on the half-life. 相似文献
244.
245.
Jozef?Saloň Viktor?MilataEmail author Miloslav?Chudík Nade?da?Prónayová Ján?Le?ko Milan?Seman Anna?Belicová 《Monatshefte für Chemie / Chemical Monthly》2004,135(3):283-291
Summary. Catalytic hydrogenation of 5-nitro-2,3-diphenylquinoxaline led to the corresponding amine which, in turn, afforded products of nucleophilic substitution on reaction with alkoxymethylene derivatives. Thermal cyclization of selected alkoxymethylene derivatives yielded substituted pyridoquinoxalines. The conditions for successful hydrolysis of ester, decarboxylation of the acid, following chlorination of pyridone and reductive removal of the chlorine atom from it to produce parental heterocycle 2,3-diphenyl-pyrido[2,3-f]quinoxaline were found. All of the tested products of the nucleophilic substitution showed no antibacterial activity.Dedicated to Prof. Dr. M. Uher on the occasion of his 65th birthday 相似文献
246.
Saario SM Salo OM Nevalainen T Poso A Laitinen JT Järvinen T Niemi R 《Chemistry & biology》2005,12(6):649-656
We have previously reported that the endocannabinoid, 2-arachidonoyl-glycerol (2-AG), is hydrolyzed in rat cerebellar membranes by monoglyceride lipase (MGL)-like enzymatic activity. The present study shows that, like MGL, 2-AG-degrading enzymatic activity is sensitive to inhibition by sulfhydryl-specific reagents. Inhibition studies of this enzymatic activity by N-ethylmaleimide analogs revealed that analogs with bulky hydrophobic N-substitution were more potent inhibitors than hydrophilic or less bulky agents. Interestingly, the substrate analog N-arachidonylmaleimide was found to be the most potent inhibitor. A comparison model of MGL was constructed to get a view on the cysteine residues located near the binding site. These findings support our previous conclusion that the 2-AG-degrading enzymatic activity in rat cerebellar membranes corresponds to MGL or MGL-like enzyme and should facilitate further efforts to develop potent and more selective MGL inhibitors. 相似文献
247.
The synthesis of several 5-methylsulfinyl-2-thiophenaldehyde derivatives is described. 相似文献
248.
Lempinen Janne Muuri Eveliina Lusa Merja Lehto Jukka 《Journal of Radioanalytical and Nuclear Chemistry》2018,316(2):717-723
Journal of Radioanalytical and Nuclear Chemistry - The sorption of inorganic radiocarbon on goethite, hematite and magnetite was studied as a function of carbon concentration, pH and ionic... 相似文献
249.
Yihua Zhang Anna-Britta Hrnfeldt Salo Gronowitz 《Journal of heterocyclic chemistry》1993,30(5):1293-1299
The alkylation of o-(2-, 3- and 4-pyridyl)-3-hydroxythiophenes has been investigated. In the case of 4-(2-, 3- and 4-pyridyl)-3-hydroxythiophene systems, the soft alkylating reagent, methyl iodide, using sodium hydride as the base and dimethylimidazolidinone as the solvent, gave rise to a mixture of O-alkylated and O,C-dialkylated products in the proportions of 4.6–6.5 to 1. However, in the case of 2-(2-, 3- and 4-pyridyl)-3-hydroxythiophene systems, the same reaction conditions brought about exclusively O-alkylated compounds in yields of 45–53%. In both cases, the hard alkylating reagent, methyl p-toluenesulfonate, with the same base and solvent, only give O-alkylated compounds in yields of 51–77%. These latter conditions resulted in a good preparative route for the regiospecific formation of o-pyridyl-3-alkoxythiophenes by using ethyl 2-bromopro-pionate as well as methyl p-toluenesulfonate as alkylating reagents. The hydrolysis of the esters, derived from alkylation with ethyl 2-bromopropionate, has also been investigated. 相似文献
250.
Elin?Nilsen Mari-Ann?EinarsrudEmail author Janne?Puputti Mika?Lind’n Jean?Le?Bell Mikael?Perander 《Journal of Sol-Gel Science and Technology》2005,35(2):143-150
The preparation and characterization of a composite binder made through a sol-gel route from an amorphous mineral raw material has been studied. The amorphous mineral raw material is alumino-silicate based but contains also alkaline earth and some transition metal oxides. A stable sol can be prepared by dissolving the raw materials in formic acid. The drying and heat treatment of the subsequent gel has been studied by thermogravimetry, nuclear magnetic resonance, infrared spectroscopy as well as X-ray diffraction studies. The different constituents of the raw material have shown to play a major role during the drying and heat treatment of the gels. The binding effect of the binder was evaluated to be good by studying paper-binder composites as well as wetting properties. 相似文献