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Search Results: 1 - 10 of 41458 matches for " ZHU Gui-bing "
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Automatic control strategy for step feed anoxic/aerobic biological nitrogen removal process
ZHU Gui-bing,PENG Yong-zhen,WU Shu-yun,WANG Shu-ying,
ZHU Gui-bing
,PENG Yong-zhen,WU Shu-yun,WANG Shu-ying

环境科学学报(英文版) , 2005,
Abstract: Control of sludge age and mixed liquid suspended solids concentration in the activated sludge process is critical for ensuring effective wastewater treatment. A nonlinear dynamic model for a step-feed activated sludge process was developed in this study. The system is based on the control of the sludge age and mixed liquor suspended solids in the aerator of last stage by adjusting the sludge recycle and wastage flow rates respectively. The simulation results showed that the sludge age remained nearly constant at a value of 16 d in the variation of the influent characteristics. The mixed liquor suspended solids in the aerator of last stage were also maintained to a desired value of 2500 g/m3 by adjusting wastage flow rates.
Removal effect on Mesocyclops leukarti and mutagenicity with chlorine dioxide
ZUO Jin-long,CUI Fu-yi,QU Bo,ZHU Gui-bing,
ZUO Jin-long
,CUI Fu-yi,QU Bo,ZHU Gui-bing

环境科学学报(英文版) , 2006,
Abstract: Mesocyclops leukarti of zooplankton propagates excessively in eutrophic water body and it cannot be effectively inactivated by the conventional drinking water treatment process. In order to tackle this problem, a study of removal effect on Mesocyclops leukarti with chlorine dioxide in a waterworks was performed. The results showed that Mesocyclops leukarti could be effectively removed from water by 1.0 mg/L chlorine dioxide preoxidation combined with the conventional drinking water treatment process. Higher oxidizability and molecular state of chlorine dioxide in water is the key to the inactivation of Mesocyclops leukarti. The chlorite, disinfection by-products (DBPs) of chlorine dioxide, was stable at 0.45 mg/L, which is lower than that critical value of the USEPA. GC-MS examination showed that the quantity of organic substance in the water treated by chlorine dioxide obviously decreased. Ames test further revealed that the mutagenicity was reduced by chlorine dioxide with respect to prechlorine. The propagation of Mesocyclops leukarti can be inactivated effectively and safely by chlorine dioxide pre-oxidation.
Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process
ZHU Gui-bing,PENG Yong-zhen,WU Shu-yun,WANG Shu-ying,XU Shi-wei,
ZHU Gui-bing
,PENG Yong-zhen,WU Shu-yun,WANG Shu-ying,XU Shi-wei

环境科学学报(英文版) , 2007,
Abstract: The simultaneous nitrification and denitrification in step-feeding biological nitrogen removal process were investigated under different influent substrate concentrations and aeration flow rates.Biological occurrence of simultaneous nitrification and denitrifieation was verified in the aspect of nitrogen mass balance and alkalinity.The experimental results also showed that there was a distinct linear relationship between simultaneous nitrification and denitrification and DO concentration under the conditions of low and high aeration flow rate.In each experimental run the floe sizes of activated sludge were also measured and the results showed that simultaneous nitrification and denitrification could occur with very small size of floc.
Analyzing the Power-law Decay of Power Spectrum Intensity and Bevavior of Intermittent Chaos of Pressure Fluctuations in a Gas-Solid Fluidized Bed

ZHAO Gui-bing,SHI Yan-fu,

过程工程学报 , 2002,
Abstract: Pressure fluctuations in a gassolid fluidized bed (0.09 m in diameter and 1m in height) with polyethylene particles were analyzed using both mutual information theory and the power-law decay of power spectrum intensity. Intermittent chaos has been experimentally observed mainly in hydrodynamic systems. Intermittency means the occurrence of a signal that alternates randomly between long regular phases (the so-called laminar) and relatively short irregular bursts (the so-called intermittency). The route of intermittent burst to chaos with the increase of gas velocity in gassolid fluidized bed was verified quantitatively according to the power-law decay of power spectrum intensity: S(f)f -a. This research shows that the laminar interval length of pressure fluctuation shortens gradually and the chaos bursts more and more frequently till to pure chaos with increase of gas velocity. By studying the relationship between the laminar interval length and Reynolds number, it is shown that the average laminar interval length decays with the power-law: T(Re-Remf)-0.492 and the route to chaos of fluidization dynamics presents the mechanism of type I intermittency.
Photooxidation Contribution Study on the Decomposition of Azo Dyes in Aqueous Solutions by VUV-Based AOPs
Chih-Ming Ma,Gui-Bing Hong,Hua-Wei Chen,Nguyen-Thi Hang,Yung-Shuen Shen
International Journal of Photoenergy , 2011, DOI: 10.1155/2011/156456
Abstract: The effects of pH value, VUV intensity, initial dye concentration, initial H2O2 concentration, and TiO2 loading dose on the degradation of three azo dyes: acid Orange 8, acid Blue 29, and acid Blue 113 were studied to explore and compare the treatment efficiencies among the adopted AOPs. It was found that pH played an important role in the degradation of dyes using VUV irradiation. For VUV/H2O2, VUV/TiO2, and VUV/TiO2/H2O2 processes, the decoloration rates of the three azo dyes were more efficient under acidic conditions relative to alkaline conditions. The degradation rates of dyes increased with increasing concentrations of H2O2, but reaction rates were retarded at high concentrations of H2O2 because the H2O2 compound acted as a scavenger of the hydroxyl radical. In this paper, three azo dyes were decomposed efficiently by VUV irradiation only demonstrating the effectiveness of VUV direct photolysis. 1. Introduction Environmental protection has been a globally important issue for the past few decades. Environmental data show that industrial wastewater mainly consists of heavy metals, volatile organic compounds (VOCs), cyanide, COD, oil, suspended solids, and sulfides. Dyes are one of the major sources of pollutants and extensively used in the textile industry, photocatalytic industry, and in photochemical applications [1]. Treatment of colored wastewaters produced by textile and other industries is a serious problem that has attracted the attention of many researchers during last few decades. In general, treatment methods of wastewater containing dyes can be divided into two main groups: (1) chemical or physical dye removal methods, which refer to the process called decoloration and (2) dye removal by means of biodegradation. Physical methods of decoloration include different precipitation methods (coagulation, flocculation, and sedimentation), adsorption (on activated carbon, biological sludge, and silica gel), filtration, reverse, and osmosis. Chemical processes involved in chemical dye removal methods include reduction, oxidation, complexometric methods, ion exchange, and neutralization. Biological treatment can be conducted aerobically or anaerobically. Practically speaking, each dye removal method has disadvantages. Physical methods are usually nondestructive, requiring expensive posttreatment processing. Chemical treatment methods using strong oxidants such as chlorine or ozone successfully treat dye wastes, but are also expensive due to high costs associated with the chemicals. Biological treatment methods do not effectively treat synthetic
Study on 3-D resistivity inversion for infinite surface-borehole line current source

QU You-heng,ZHANG Gui-bing,ZHAO Lian-feng,WEN Zhan-jiu,

地球物理学进展 , 2007,
Abstract: The 3-D inversion for the finite line source is one of the major subjects in the field of the earth inspection.In this paper,the following progress has been discussed:(1) the improved conjugate gradient algorithm which combines the inversion equation;(2) the formulation for velvet gene at all directions and the approximation method of Jacobian matrics based on disturbance method;(3) the model is adjusted by analyzing the influence of damp coefficient and correction factor to inversion result;(4) the influence of damp coefficient to the resolution of inversion is studied.to some degree,we improved the problem of "barycenter ascending shift" to electric anomalous body in 3-D resistivity inversion.Through numerical simulation,it is found that the improved conjugate gradient algorithm is less dependent on the initial model and resolve,the inversion using this new method can converge to a stable value and shows high resolution to position.
LcMYB1 Is a Key Determinant of Differential Anthocyanin Accumulation among Genotypes, Tissues, Developmental Phases and ABA and Light Stimuli in Litchi chinensis
Biao Lai, Xiao-Jing Li, Bing Hu, Yong-Hua Qin, Xu-Ming Huang, Hui-Cong Wang, Gui-Bing Hu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0086293
Abstract: The red coloration of litchi fruit depends on the accumulation of anthocyanins. The anthocyanins level in litchi fruit varies widely among cultivars, developmental stages and environmental stimuli. Previous studies on various plant species demonstrate that anthocyanin biosynthesis is controlled at the transcriptional level. Here, we describe a litchi R2R3-MYB transcription factor gene, LcMYB1, which demonstrates a similar sequence as other known anthocyanin regulators. The transcription levels of the LcMYB1 and anthocyanin biosynthetic genes were investigated in samples with different anthocyanin levels. The expression of LcMYB1 was strongly associated with tissue anthocyanin content. LcMYB1 transcripts were only detected in anthocyanin-accumulating tissues and were positively correlated with anthocyanin accumulation in the pericarps of 12 genotypes. ABA and sunlight exposure promoted, whereas CPPU and bagging inhibited the expression of LcMYB1 and anthocyanin accumulation in the pericarp. Cis-elements associated with light responsiveness and abscisic acid responsiveness were identified in the promoter region of LcMYB1. Among the 6 structural genes tested, only LcUFGT was highly correlated with LcMYB1. These results suggest that LcMYB1 controls anthocyanin biosynthesis in litchi and LcUFGT might be the structural gene that is targeted and regulated by LcMYB1. Furthermore, the overexpression of LcMYB1 induced anthocyanin accumulation in all tissues in tobacco, confirming the function of LcMYB1 in the regulation of anthocyanin biosynthesis. The upregulation of NtAn1b in response to LcMYB1 overexpression seems to be essential for anthocyanin accumulation in the leaf and pedicel. In the reproductive tissues of transgenic tobacco, however, increased anthocyanin accumulation is independent of tobacco's endogenous MYB and bHLH transcriptional factors, but associated with the upregulation of specific structural genes.
Differential Expression of Anthocyanin Biosynthetic Genes in Relation to Anthocyanin Accumulation in the Pericarp of Litchi Chinensis Sonn
Yong-Zan Wei,Fu-Chu Hu,Gui-Bing Hu,Xiao-Jing Li,Xu-Ming Huang,Hui-Cong Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019455
Abstract: Litchi has diverse fruit color phenotypes, yet no research reflects the biochemical background of this diversity. In this study, we evaluated 12 litchi cultivars for chromatic parameters and pigments, and investigated the effects of abscisic acid, forchlorofenron (CPPU), bagging and debagging treatments on fruit coloration in cv. Feizixiao, an unevenly red cultivar. Six genes encoding chalcone synthase (CHS), chalcone isomerase (CHI), flavanone 3-hydroxylase (F3H), dihydroflavonol 4-reductase (DFR), anthocyanidin synthase (ANS) and UDP-glucose: flavonoid 3-O-glucosyltransferase (UFGT) were isolated from the pericarp of the fully red litchi cv. Nuomici, and their expression was analyzed in different cultivars and under the above mentioned treatments. Pericarp anthocyanin concentration varied from none to 734 mg m?2 among the 12 litchi cultivars, which were divided into three coloration types, i.e. non-red (‘Kuixingqingpitian’, ‘Xingqiumili’, ‘Yamulong’and ‘Yongxing No. 2′), unevenly red (‘Feizixiao’ and ‘Sanyuehong’) and fully red (‘Meiguili’, ‘Baila’, Baitangying’ ’Guiwei’, ‘Nuomici’ and ‘Guinuo’). The fully red type cultivars had different levels of anthocyanin but with the same composition. The expression of the six genes, especially LcF3H, LcDFR, LcANS and LcUFGT, in the pericarp of non-red cultivars was much weaker as compared to those red cultivars. Their expression, LcDFR and LcUFGT in particular, was positively correlated with anthocyanin concentrations in the pericarp. These results suggest the late genes in the anthocyanin biosynthetic pathway were coordinately expressed during red coloration of litchi fruits. Low expression of these genes resulted in absence or extremely low anthocyanin accumulation in non-red cultivars. Zero-red pericarp from either immature or CPPU treated fruits appeared to be lacking in anthocyanins due to the absence of UFGT expression. Among these six genes, only the expression of UFGT was found significantly correlated with the pericarp anthocyanin concentration (r = 0.84). These results suggest that UFGT played a predominant role in the anthocyanin accumulation in litchi as well as pericarp coloration of a given cultivar.
Highly metabolic thrombus of the portal vein: F fluorodeoxyglucose positron emission tomography/computer tomography demonstration and clinical significance in hepatocellular carcinoma
Long Sun, Yong-Song Guan, Wei-Ming Pan, Gui-Bing Chen, Zuo-Ming Luo, Ji-Hong Wei, Hua Wu
World Journal of Gastroenterology , 2008,
Abstract: AIM: To assess the ability of 18F-fluorodeoxyglucose positron emission tomography/computer tomography (18F-FDG PET/CT) to differentiate between benign and malignant portal vein thrombosis in hepatocellular carcinoma (HCC) patients.METHODS: Five consecutive patients who had HBV cirrhosis, biopsy-proven HCC, and thrombosis of the main portal vein and/or left/right portal vein on ultrasound (US), computer tomography (CT) or magnetic resonance imaging (MRI) were studied with 18F-FDG PET/CT. The presence or absence of a highly metabolic thrombus on 18F-FDG PET/CT was considered diagnostic for malignant or benign portal vein thrombosis, respectively. All patients were followed-up monthly with US, CT or MRI. Shrinkage of the thrombus or recanalization of the vessels on US, CT or MRI during follow-up was considered to be definitive evidence of the benign nature of the thrombosis, whereas enlargement of the thrombus, disruption of the vessel wall, and parenchymal infiltration over follow-up were considered to be consistent with malignancy. 18F-FDG PET/CT, and US, CT or MRI results were compared.RESULTS: Follow-up (1 to 10 mo) showed signs of malignant thrombosis in 4 of the 5 patients. US, CT or MRI produced a true-positive result for malignancy in 4 of the patients, and a false-positive result in 1. 18F-FDG PET/CT showed a highly metabolic thrombus in 4 of the 5 patients. 18F-FDG PET/CT achieved a true-positive result in all 4 of these patients, and a true-negative result in the other patient. No false-positive result was observed using 18F-FDG PET/CT.CONCLUSION: 18F-FDG PET/CT may be helpful in discriminating between benign and malignant portal vein thrombi. Patients may benefit from 18F-FDG PET/CT when portal vein thrombi can not be diagnosed exactly by US, CT or MRI.
Adaptive fuzzy control based on variable universe and its application to aero engine turbine power generator

ZHENG Hong,XU Hong-bing,ZHU Gui-ping,

控制理论与应用 , 2008,
Abstract: Aero engine turbine power generator is a typical nonlinear and time-varying system with intense disturbances,high uncertainty and model complexity.It is difficult to achieve a good performance by traditional control methods.Adap-tive fuzzy control method based on variable universe has advantages such as no need for exact models,fast response,andhigh precision and strong robustness.In this paper,the control algorithm is applied to an aero engine turbine power gener-ator.Firstly,the corresponding structure design and contraction-expansion factor selection of the controller are provided indetails,and then the control law is given.Finally,by the field test and trial production,it is proved that the control schemeis reliable and effective.
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