Results 1 - 5 of 5
Results 1 - 5 of 5. Search took: 0.016 seconds
|Sort by: date | relevance|
[en] Thermal stratification is an asymmetrical temperature distributing phenomena which is due to the hot liquid and the cold liquid which have low velocity are not mixed. There are thermal stratification phenomena in the pressurizer surge line. It's of great importance for the safety operation of nuclear power plants to research the thermal stratification in the pressurizer surge line. This paper theoretically analyzed the origin for thermal stratification, and numerically simulated the thermal stratification phenomena. The stratification transients are completed in different cross-sections of the surge line. (authors)
[en] Graphical abstract: In this work, Au (111)-like nanoparticle array was electrodeposited by novel electrochemical protocol. This work provided a feasible approach to prepare Au (111)-like nanoparticle array with a controllable, cost-effective, and without any template or surfactant way. The electrochemical behavior of oxidation of glucose in alkaline media on the as-prepared electrode was discussed. In addition, the as-prepared electrode was served as an enzyme-free glucose sensor to detect the concentration of glucose. - Abstract: In this article, the electrochemical oxidation and the non-enzymatic voltammetric and amperometric detection of glucose using an Au (111)-like nanoparticle-ensemble electrode is described. Moreover, the electrochemical behavior of oxidation of glucose in alkaline media on the as-prepared electrode is discussed. The as-prepared electrode was characterized by field emission scanning electron microscope, cyclic voltammetry. The as-prepared electrode provided excellent electrochemical performance for kinetic-controlled non-enzymatic glucose oxidation reaction with a linear response range from 30 μM to 45 mM, a low detection limit of 10 μM (signal to noise ratio of 3) and a high sensitivity 67.2 μA mM"−"1 cm"−"2 without the interference of 0.15 M chloride, which could be ascribed to the unique ratio of the different crystal planes exposed on the nanocrystal surface. In addition, the amperometric response of the sensor showed a linear relationship up to a glucose concentration of 11 mM with a high sensitivity of 23.0 μA mM"−"1 cm"−"2. The Au (111)-like nanoparticle-ensemble electrode with high sensitivity, good stability and reproducibility as well as excellent biocompatibility made it promising for the development of enzyme-free sensors
[en] It is impossible to solve classification problems of spectral energy levels of heavy elements completely only by means of experimental technique or theoretical calculation. So far, as an example, many energy levels in the first spectrum of uranium (U I) have not been classified definitely according to their electronic configurations. Classification pattern recognition technique has been demonstrated an effective approach to deal with such problems. Therefore, an improved pattern recognition technique called PCA-BPN, which combines principal component analysis (PCA) with back propagation neural networks (BPN), has been applied to research unknown U I even-parity energy level's classification according to electronic configuration. As far as those thirty seven unknown U I energy levels which could not be assigned definitely by K nearest neighbors (KNN) technique in an early research, PCA-BPN assigns definitely thirty six unknown U I energy levels' electronic configuration types among them
[en] A semi-solid state electrochromic device with deep eutectic solvent gel as the electrolyte, Ethyl-viologen as the electrochromic compound, and K4Fe(CN)6 as the electron donor was reported. Four kinds of silica were simply mixed with ethaline for preparing the gel electrolyte, and the hydrophilic ones were found to be capable of being used as the gelling agent. To enhance the electron transfer at the electrode/gel interface and keep the transparency of the electrode, tiny amount of Au was electrochemically deposited on the FTO electrode. The as-prepared electrochromic device shows a coloration time of ca. 60 s at −0.7 V with the coloration efficiency of 91 cm2/C, and a bleaching time of ca. 150 s at 0 V with the efficiency of 194 cm2/C. The reversible response of the electrochromic device up to 820 cycles with ΔTmax > 60% was also demonstrated.
[en] In this article, for the first time, a novel, label-free and inherent electroactive redox biosensor based on ultrathin Au-Pt nanowire-decorated thionine/reduced graphene oxide (AuPtNWs/THI/rGO) is developed for carcinoembryonic antigen (CEA) detection. Ultrathin AuPtNWs are prepared by a one-pot synthesis method without the use of any stabilizer or template. The AuPtNWs/THI/rGO composites are obtained by the THI/rGO composites surface functionalized with -NH2 group employed as a support for loading ultrathin AuPtNWs by coordination. The AuPtNWs/THI/rGO composites not only favor the immobilization of antibody but also facilitate the electron transfer. It is found that the resultant AuPtNWs/THI/rGO composites can be designed to act as a sensitive label-free electrochemical immunosensor for CEA determination. Under the optimized conditions, the linear range of the proposed immunosensor is estimated to be from 50 fg·mL−1 to 100 ng·mL−1 (R= 0.998) and the detection limit is estimated to be 6 fg·mL−1 at a signal-to-noise ratio of 3, respectively. The prepared immunosensor for detection of CEA shows high sensitivity, reproducibility and stability. Our study demonstrates that the proposed immunosensor has also been used to determine CEA successfully in diluted blood samples