Through changing the start-up water quality of internal-circulation bio-fluidized bed, the N/C composition was enhanced to strengthen the nitrifying action of fluidized bed of late period. After the strengthening star...
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Through changing the start-up water quality of internal-circulation bio-fluidized bed, the N/C composition was enhanced to strengthen the nitrifying action of fluidized bed of late period. After the strengthening start-up (high N/C and low COD) treating living waste water with the HRT 2h, a high simultaneous removal efficiency of COD and ammonia nitrogen could be realized;the average ammonia nitrogen removal rate was 74%. The test of oxygen consumption rate showed that after the strengthening start-up, the activity of hetertrophic bacteria in the biofim of fluidized bed decreased greatly, the activity of ammonia oxidize bacteria enhanced obviously, the activity of nitrifying bacteria did not change greatly. The track analysis results of bacterial quinone of the system showed that after the strengthening start-up of ammonia removal, the number of nitrifying bacteria in the biofilm increased obviously;the distribution even change of the microbial community was small with the gram-negative bacteria being the dominant. The observation of scanning electric microscope showed that the biofilm under low N/C start-up condition was thick and dense, the heterotrophic bacteria had high proportion;high N/C start-up condition was favorable to the growth of nitrifying bacteria, the biofilm was thin relatively.
A generalized scheme based on the variable structure output feedback control (VSOFC) and input shaping (IS) technique has been proposed for the rotational maneuver and vibration suppression of an orbiting spacecraft w...
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In our paper, the analytical structures and properties of the one and two dimensional fuzzy controllers are first investigated in details. The nature of these two kinds of fuzzy controllers is next probed from the vie...
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A novel subpixel corner detection method based on spatial moment is developed in this paper. Firstly, the spatial-moment-generating function, gradient magnitude and variation of gradientdirection corner are used as th...
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A novel subpixel corner detection method based on spatial moment is developed in this paper. Firstly, the spatial-moment-generating function, gradient magnitude and variation of gradientdirection corner are used as the decision rule of corner detection by analyzing the mathematical formula of corner-model spatial moment. Then Non-max suppression technique is utilized to detect the vertex of feature corner. Finally, in order to improve its localization performance, subpixel corner detection is implemented by the bilinear interpolation and Newton iteration method. Experiments illustrate that the spatial moment corner detector has better robustness and localization performance than Kitchen detector and Harris detector.
Flexible joint, one kind of force-sensing element, is a key part of flexible gyro. Its stiffness is very small such that it is easily disturbed by noises in working environment. During the development of the instrumen...
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The spectrogram of Doppler ultrasound signal has been widely used in the clinical diagnosis. The additional frequency component arising from noise will produce an adverse effect on the subjective analysis of the spect...
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In this paper, a fast algorithm for flat sliding detecting on wheels of passenger train is developed. Firstly, the input signal is denoised by using filter bank to enhance its SNR, and the first and second derivative ...
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In this paper, a fast lossless compression scheme is presented for the medical image. This scheme consists of two stages. In the first stage, a Differential Pulse Code Modulation (DPCM) is used to decorrelate the raw ...
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A global optimization technique for Image registration using the concept of nonlinear correlation information entropy (NCIE) as the matching criterion is presented. The method makes it possible to efficiently overcome...
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Color flow imaging plays a major role in the diagnosis of many vascular diseases, especially cardiovascular disease. A novel scheme is proposed to suppress velocity ambiguity induced by the narrowband estimators based...
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