Chengfu Wang

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The effects of sodium citrate on the fermentative co-production of S-adenosylmethionine (SAM) and glutathione (GSH) using Candida utilis CCTCC M 209298 were investigated. Sodium citrate was beneficial for the biosynthesis of SAM and GSH and in turn improved intracellular SAM and GSH contents. Adding 2 g/L of sodium citrate at 15 h was the most efficient(More)
The main purpose of this study was to prepare selenium/glutathione-enriched Candida utilis and investigate its effect on growth performance, antioxidant capacity, and immune response in rats. The preparation of the selenium/glutathione-enriched yeast was conducted using fed-batch culture for high cell density. The optimal culture conditions for increased(More)
Modular multilevel converter (MMC) is believed the most competitive solution for high-voltage direct current (HVDC) transmission using voltage source converters. Circulating current suppressing strategies based on proportional resonant (PR) controllers are widely used in MMC. This kind of strategies can effectively eliminate all the circulating current(More)
OBJECTIVE To study the effect of L-arabinose on the blood glucose level of adult, and to find out the optimal amount of daily L-arabinose intake for maintaining their health. METHODS 50 adult were randomly selected and assigned to 5 group with different dose of L-arabinose or placebo, respectively. The preprandial blood glucose level and 1 h and 2h(More)
To recognize digital display instrumentpsilas reading, a BP neutral network is designed, an improved BP algorithm and 15-feature extraction method is proposed. The image of instrument plate is obtained by an digital camera and transmitted to PC firstly, then an image preprocessing is carried through. The image preprocessing includes gray processing,(More)
Base on the power flow formulations, a new power flow model that allows for power exchanges among subareas of network and automation generation control in each subarea, is established. The proposed power flow model is rendering by unified newton iteration formulation. Parameters representing the level or allocation of the unbalancing power are introduced to(More)
With large scale wind farm integration, the effect of wind farm dynamic equivalent model accuracy is increasing on power system dynamic and transient stability, so the traditional equivalent and multi-group method can't meet requirement of some studies. Therefore, due to the deficiency of traditional wind farm equivalent method, a new multi-group method is(More)
We propose a multi-linear algebra based subspace learning approach for finding linear projection which preserves some implicit structural or locally-spatial information among the original feature space. Our method uses a new tensor data representation model, in which, each group of data points are partitioned into several equal-sized sub-groups with its(More)
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