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  • Author: Shuai Wang x
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Du Xinhui, Wang Shuai and Zhang Juan

Abstract

With the rapid development of photovoltaic power generation technology, photovoltaic power generation system has gradually become an important component of the integrated energy system of marine. High precision short-term photovoltaic power generation forecasting is becoming one of the key technologies in ship energy saving and ship energy efficiency improving. Aiming at the characteristics of marine photovoltaic power generation system, we designed a highprecision power forecasting model (WT+ESN) for marine photovoltaic power generation system with anti-marine environmental interference. In this model, the information mining of the photovoltaic system in marine environment is carried out based on wavelet theory, then the forecasting model basing on echo state network is construct ed. Lastly, three kinds of error metrics are compared with the three traditional models by Matlab, the result shows that the model has high forecasting accuracy and strong robustness to marine environmental factors, which is of great significance to save fuel for ships, improve the energy utilization rate and assist the power dispatching and fuel dispatching of the marine power generation system.

Open access

Guowei Shu, Shuai Wang, He Chen, Man Hu, Tao Qin and Qi Ma

Abstract

In order to investigative the effect of different neutralizers and their feeding time on culture of Bifidobacterium bifidum BB01, and pH, OD and viable count of B. bifidumBB01 in the medium in different time were measured. The results indicated that the NaOH solution was the optimum neutralizer compared with the others, and feeding time of the neutralizer to B. bifidum BB01 was 13 hours after inoculation. Furthermore, the OD value and viable count reached maximum at 21h (OD value= 1.667) and 20h (viable count: (3.52±0.046) ×109 CFU/mL) after the NaOH solution was added to the medium, respectively. In addition, the maximum OD value implied that the logarithmic phase of B. bifidum BB01 was delayed compared with the control and the viable count were 29.26% larger than the control group. The result of the study provides a method and an important basis for improving the viable counts of B. bifidum BB01.

Open access

Hongping Li, Lin Chen, Shuai Liu, Changsheng Li, Jian Meng and Zhongchang Wang

Abstract

Chemical doping represents one of the most effective ways in engineering electronic structures of anatase TiO2 for practical applications. Here, we investigate formation energies, geometrical structures, and electronic properties of Si-, F-doped and Si/F co-doped anatase TiO2 by using spin-polarized density functional theory calculation. We find that the co-doped TiO2 is thermodynamically more favorable than the Si- and F-doped TiO2- Structural analysis shows that atomic impurity varies crystal constants slightly. Moreover, all the three doped systems show a pronounced narrowing of band gap by 0.33 eV for the F-doped TiO2, 0.17 eV for the Si-doped TiO2, and 0.28 eV for the Si/F-co-doped TiO2, which could account for the experimentally observed redshift of optical absorption edge. Our calculations suggest that the Si/F-co-doping represents an effective way in tailoring electronic structure and optical properties of anatase TiO2.