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11.
Decomposition of N2O has been studied on pure La2CuO4, La2CuO4 with 5 and 10 wt. % LaNi5 and oxidized LaNi5 in the temperature range of 240–490 °C at 50 and 200 Torr initial pressures of N2O. The addition of LaNi5 decreases the energy of activation compared to that of La2CuO4 which has been explained based on the dispersity of NiO over La2CuO4.
N2O La2CuO4 La2CuO4 LaNi5 5–10 .%, 240–490°C N2O 50 200 . LaNi5 , . NiO La2CuO4.相似文献
12.
A variety of benzyl halides were converted to the corresponding aldehydes/ketones in respectable yields by IBX in DMSO at 65 °C. The bromohydrin reaction of olefins using NBS-H2O in DMSO can be nicely adapted to IBX-mediated oxidation of benzyl halides in such a way that olefins are converted to the corresponding 1,2-diketones in good isolated yields in one-pot. 相似文献
13.
Ahmed Kamal K. Laxma Reddy V. Devaiah N. Shankaraiah Y. Narasimha Reddy 《Tetrahedron letters》2004,45(41):7667-7669
A methodology based on reductive cleavage followed by cyclization, for the solid-phase synthesis of pyrrolo[2,1-c][1,4]benzodiazepines employing DIBAL-H, is described. 相似文献
14.
Catalytic decomposition of N2O has been studied over a series of solid solution La2CuxZn1–xO4 (02O, in the temperature range 330–490°C. The observed trends in the kinetics have been explained based on polaron hopping mechanism. Parallel variation between activity and magnetic susceptibility has been observed.
N2O La2CuxZn1–xO4 (0相似文献2O 200 330–490°C. . .
15.
Decomposition of N2O has been studied over La2Cu0.5M0.5O4 (M=Co, Ni, Cu and Zn) between 380 and 485°C at 50 torr initial pressure of N2O to understand the mutual interaction of two different active metal ions of the same concentration and valence in deciding the physico-chemical and catalytic properties. A multicenter type of adsorption of N2O has been visualized and it is found that the rate is governed by the electronic factor.
N2O La2Cu0,5M0,5O4 (M=Co, Ni, Cu Zn) 380–485°C N2O, 50 . , - . N2O. .相似文献
16.
Komath SS Kenoth R Giribabu L Maiya BG Swamy MJ 《Journal of photochemistry and photobiology. B, Biology》2000,55(1):49-55
The interaction of several free-base porphyrins and their corresponding copper(II) and zinc(II) derivatives with the galactose-specific lectin from snake gourd (Trichosanthes anguina) seeds has been investigated by absorption and fluorescence spectroscopic techniques. The lectin dimer contains two apparently equivalent binding sites for the porphyrins. Association constants obtained for the interaction of various porphyrins with the lectin are in the range 1.7 x 10(4)-6.2 x 10(5) M(-1), with the metalloporphyrins being seen to have higher affinity for the lectin compared with the free-base analogues. Both positively charged and negatively charged porphyrins bind to snake gourd seed lectin (SGSL) with comparable affinities, suggesting that binding occurs primarily via hydrophobic interactions. Further, binding of porphyrins is found to be largely unaffected by the presence of the sugar ligand, lactose, indicating that the binding sites for the carbohydrate and porphyrin are different. This study thus suggests that the lectin may serve as a receptor for some endogenous non-carbohydrate, hydrophobic ligand in vivo, in addition to the saccharide ligands. It also opens up the possibility of employing the T. anguina lectin in applications such as photodynamic therapy, which involve the use of porphyrins. 相似文献
17.
Kumaraswamy S Kommana P Kumar NS Swamy KC 《Chemical communications (Cambridge, England)》2002,(1):40-41
New modes of 1,3-dipolar cycloaddition are uncovered by the isolation of [CH2(6-t-Bu-4-Me-C6H2O)2]P(C(CO2Me)C(CO2Me)N[NP(N3)(OC6H2-6-t-Bu-4-Me)2CH2]N) (3) and [CH2(6-t-Bu-4-Me-C6H2O)2]P(C(CO2Me)C(CO2Me)C(O)N) (4) on treating [CH2(6-t-Bu-4-Me-C6H2O)2]P-X [X = N3 (1) and NCO (2)] with the dipolarophile MeO2CC identical to CCO2Me; compound 4 undergoes an unprecedented ring expansion upon addition of 2-(methylamino)ethanol to afford the spirocycle [CH2(6-t-Bu-4-Me-C6H2O)2]P(OCH2CH2N(Me)CH(CO2Me)CH(CO2Me)C(O)N) (5). 相似文献
18.
The kinetics of oxidation of 2-thiouracil (TU) by sodium N-bromobenzenesulphonamide or bromamine-B (BAB) have been studied in an HCl medium, catalyzed by RuCl3, and in a NaOH media with OsO4 as catalyst, at 313 K. The stoichiometry and oxidation products are the same in both cases, but their kinetic patterns were found to be different. In acid medium the rate shows a first order dependence in each of [BAB] and [TU], and is dependent on [RuIII]. The reaction rate is inversely dependent on [H+]. In alkaline medium, the rate is first order in [BAB] and in [OsVIII] and zero order in [TU]. The reaction rate is dependent on [NaOH]. Activation parameters have been evaluated, solvent isotope effects have been studied in D2O medium, and equilibrium constants were calculated. The activation parameters and rate constants indicate that the catalytic efficiency is: OsVIII > RuIII. The proposed mechanisms and the derived rate laws are consistent with the observed kinetics. 相似文献
19.
K. J. Tony V. Mahadevan J. Rajaram C. S. Swamy 《Reaction Kinetics and Catalysis Letters》1997,62(1):105-116
Thetrans-dioxo ruthenium (VI) complex, [P(C6H5)3C6H5CH2]+[Ru(O)2OAcCl2] or tetrapropylammonium perruthenate catalyzes the oxidation of secondary alcohols to ketones byN-methylmorpholine-N-oxide (NMO). Kinetic studies showed the formation of a complex between catalyst and substrate (alcohol) as the first step
in the mechanism. 相似文献
20.
Moorthy JN Venkatakrishnan P Mal P Venugopalan P 《The Journal of organic chemistry》2003,68(2):327-330
The supramolecular nonbonded C-H...X interactions between formyl hydrogens and ortho-halogen atoms (Br/Cl) have been exploited to achieve conformational control in the solid state of dimethyl-substituted iso- and terephthaladehydes (1-3) for unprecedented diphotocyclization. It is shown that the dihalogen substitution also contributes to the stability of the benzocyclobutenols relative to their precursor photoenols, so that the solid-state photolysis of dialdehydes 2b, 2c, and 3b leads to diphotocyclization to afford respectable yields of bis-benzocyclobutenols. 相似文献