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The required conditions are considered for the potential-independence of steady state diffusion layer thickness in an electrochemical
experiment. Such conditions are illustrated by numerical solution of the mass transport equations for an electroactive species
at the microdisc and tubular flow electrodes.
Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 1, pp. 134–141.
The text was submitted by the authors in English. 相似文献
75.
Poobalasingam Abiman Gregory G. Wildgoose Lei Xiao Richard G. Compton 《Electroanalysis》2008,20(14):1607-1609
The detection of palladium using adsorptive stripping voltammetry reported by Wang et al. (J. Wang, K. Varughese Anal. Chim. Acta 1987, 199, 185 [3]) at a hanging mercury drop electrode is extended to a more convenient solid electrode. To this end a random array of 3.5×108 mercury nanodroplets per cm2 (65 nm average diameter) was electrodeposited on a glassy carbon substrate. Adsorptive stripping voltammetry was performed using 2×10?4 M dimethylglyoxime as a chelating agent for the Pd(II) ion, with accumulation at ?0.20 V vs. SCE for 120 s and a linear detection range of 5–150 μM was determined with a limit of detection of 1.6 μM. 相似文献
76.
Roohollah T. Kachoosangi Gregory G. Wildgoose Richard G. Compton 《Electroanalysis》2008,20(23):2495-2500
The utilization of the capsaicin modified carbon nanotube modified basal‐plane pyrolytic graphite electrode or p‐chloranil modified carbon paste electrodes are presented for the determination of pharmaceutical compounds containing amine functionality, such as benzocaine and lidocaine. In detection of benzocaine at a capsaicin modified electrode, the guaiacol functional group is irreversibly electrochemically oxidized to form the o‐quinone derivative which then undergoes nucleophilic attack by the aromatic amine group in benzocaine via a 1,4‐Michael addition mechanism forming a catechol‐amine adduct. The electrochemically initiated formation of the capsaicin‐benzocaine adduct causes a linear decrease in the voltammetric signal corresponding to capsaicin which correlates to the added concentration of benzocaine. 相似文献
77.
Gold nanoparticles were deposited electrolessly on multiwalled carbon nanotubes (CNTs) via in situ reduction of HAuCl4 by NaBH4. The resulting gold covered nanotubes were immobilised onto the surface of a glassy carbon electrode via evaporation of a suspension in chloroform. Anodic stripping voltammetry was performed with the modified electrode in As(III) solutions. A limit of detection (LOD based on 3σ) of 0.1 μg L−1 was obtained but more importantly a sensitivity of 1985 μA μM−1 was obtained with square wave voltammetry (SWV) in an optimised system with a deposition time of 120 s. These values, particularly the high sensitivity compare favourably with previously reported methods in the area of electrochemical arsenic detection. 相似文献
78.
X-Ray Photoelectron Spectroscopy (XPS) was used to quantify the amount of bromide ions present in two samples of [C(4)mpyrr]Br dissolved in the room temperature ionic liquid (RTIL) [C(4)mpyrr][N(Tf)2]. One sample was of a known concentration (0.436 Br atom%); the other was a saturated solution. The results obtained from quantitative XPS analysis indicated that the saturated sample had a concentration, or solubility, of 0.90 Br atom% (746 mM) at 298 K, which was then independently confirmed by potential-step chronoamperometry of the same solution. 相似文献
79.
This communication presents initial results into the use of chronoamperometry of acoustically agitated particulate suspensions at a dual electrode as a means of approximately sizing the suspended particles. 相似文献
80.
Kathryn E. Toghill Lei Xiao Gregory G. Wildgoose Richard G. Compton 《Electroanalysis》2009,21(10):1113-1118
We report the simultaneous electroanalytical determination of Pb2+ and Cd2+ by linear sweep anodic stripping voltammetry (LSASV) using an antimony nanoparticle modified boron doped diamond (Sb‐BDD) electrode. Sb deposition was performed in situ with the analytes, from a solution of 1 mg L?1 SbCl3 in 0.1 M HCl (pH 1). Pb2+ inhibited the detection of Cd2+ during simultaneous additions at the bare BDD electrode, whereas in the presence of antimony, both peaks were readily discernable and quantifiable over the linear range 50–500 μg L?1. 相似文献