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Search Results: 1 - 10 of 61009 matches for " Yu Deshuang "
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Preparation of BiVO4@Fiber Composites and the Photocatalytic Property for Degradation of Organic Dyes under Visible-Light  [PDF]
Wei Lu, Deshuang Yu, Xiaochen Zhou, Yan Zhang, Jianqiang Yu
Green and Sustainable Chemistry (GSC) , 2011, DOI: 10.4236/gsc.2011.13016
Abstract: In this article, a novel BiVO4@fibers composite photocatalyst was prepared by a process that monoclinic scheelite BiVO4 nano/micro particles were in situ formated onto fiber materials. The structure, morphology and photophysical properties of the composite materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis diffuse reflectance spectroscopy, respectively. The immobilization of BiVO4 photocatalyst on fibers reduced the particle size of the photoactive phase, and a few visible-light absorption abilities. The decomposition of a non-biodegradable dye Red FN-3G was selected to examine the photocatalytic activity of the composite photocatalyst. It was found that the formation of composite materials of BiVO4 with fibers didn’t decrease the photocatalytic activity with comparison to that of pure BiVO4. Moreover, it demonstrated that when adjusting the dye solution into about pH = 3, the highest efficiency of dye degradation over the fiber composite material can be obtained.
The "Bottleneck" Behaviours in Linear FNNCs and Their Breakthrough
The "Bottleneck" Behaviours in Linear Feedforward Neural Network Classifiers and Their Breakthrough

HUANG Deshuang,

计算机科学技术学报 , 1999,
Abstract: The classification mechanisms of linear feedforward neural network classifiers (FNNC), whose hidden layer performs the Fisher linear transformation of the input patterns, under the supervision of outer-supervised signals are inves- tigated. The "bottleneck" behaviours in linear FNNCs are observed and analyzed. In addition, the structure stabilities of the linear FNNCs are also discussed. It is pointed out that the key point to break through the "bottleneck" behaviours for lin- ear FNNCs is to change linear hidden neurons into nonlinear hidden ones. Finally, the experimental results, taking the parity 3 problem as example, are given.
Enhancement in Photoelectrochemical Efficiency by Fabrication of @MWCNT Nanocomposites
Yan Zhang,Jianqiang Yu,Hongwei Wang,Mengmeng Sun,Yuyu Bu,Deshuang Yu,Weibing Li
Journal of Nanotechnology , 2011, DOI: 10.1155/2011/702130
Abstract: An enormous enhancement in the photo-to-current conversion efficiency over the nanocomposite material composed by BiVO4 on the surface of MWCNTs, with respect to electrode of pure BiVO4, was observed. The heterojunction formed between MWCNTs and nano-BiVO4 is beneficial for the separation of photogenerated electrons and holes, resulting in more electrons that are able to transport efficiently to the surface and therefore enhance the photoefficiency. 1. Introduction Since the photoelectrochemical water splitting (the Honda-Fujishima effect) was reported in 1972 [1], great progresses have been made on the research and application of photocatalysis and photoelectrochemistry both in energy and environmental fields. Up to date, the design and development of visible-light-responsive photocatalysts is one of the research directions, because the utilization of visible light, which accounts for more than half of the solar spectrum, is significant. For this goal, it is utmost important to develop photocatalysts with a narrow band gap. One of the efforts consists of creating an electron donor level between the valence band and conduction band of TiO2 by doping with metallic or nonmetallic elements such as such as Ag, Cu, Fe, Co, V, Cr, and Pd and rare earth element or N, S, and C [2–10]. However, although the doping of foreign elements extends the absorption to visible-light ranges, it increases the defects of semiconductor photocatalysts, which therefore is a part of the ultraviolet light-responsive performance that the titanium oxide originally possessed was occasionally ruined [11–17]. Another effort is the exploring of complex compounds that containing Bi3+, In3+, Sn2+ (s2 configuration), or Ag+ (d10 configuration) ions in an oxide system. Thus, it is able to elevate the valence band by means of the hybridization of their respective orbitals with the orbital, and also narrowing the band gap of the semiconductor [18]. BiVO4 is one of such complex oxides with narrow band gap. BiVO4 shows not only excellent visible-light photocatalytic properties, but also a high photo-to-current conversion efficiency [19–27]. Almost a decade ago, the high activity of BiVO4 for photocatalytic O2 evolution from aqueous suspensions containing Ag+ as a sacrificial electron acceptor under visible-light irradiation was observed [19]. It was then discovered that nanocrystalline BiVO4 thin-film electrodes show high photocurrent yields for oxygen evolution in neutral aqueous electrolytes [25–27]. Therefore, BiVO4 might be a good visible-light photovoltaic material. However, at the
A/O pilot-scale nitrogen removal process treating domestic wastewater Ⅱ. The study of system characteristics and SND

MA Yong,PENG Yongzhen,YU Deshuang,

环境科学学报 , 2006,
Abstract: The COD, ammonia and total nitrogen (TN) removal efficiency were studied in the paper at low DO concentration in a pilot-scale A/O nitrogen removal plant treating domestic wastewater. The experimental results showed that the COD and ammonia removal efficiency reach 85% and 92%, respectively. Because of the low influent COD/TN ratio (2.93), the average TN removal efficiency was only 64%, while TN removal efficiency could be increased by 12% with the nitrite accumulation ratio increased from 15% to 85%. A good correlation of ammonia removal efficiency, nitrification rate and TN removal efficiency was found. Simultaneous nitrification and denitrification (SND) with nitrite at low DO level could be realized, which contributed to 5%~12% TN nitrogen removal based on nitrogen mass balance. The SND would be damaged with the DO increased, and the mechanism of SND with nitrite was presented.
Nitrogen removal from the sewage containing seawater via nitrite pathway

Yu Deshuang,Peng Yongzhen,Song Xueqi,Li Mei,
Yu D
,Peng Y,Song X,Li M

环境科学 , 2003,
Abstract: With control of the concentration of free ammonia (FA), shortened nitrification-denitrification was accomplished in SBR to achieve enhanced nitrogen removal from the sewage containing seawater. Several parameters which included salinity, temperature, pH and NH4(+)-N load were studied to evaluate their effects. The results of experiences indicated that shortened nitrification-denitrification can be accomplished in sewage containing seawater with relatively high salinity. With various salinity, the nitrogen removal efficiency had relationship with the NH4(+)-N load, there should be a lower NH4(+)-N load when the salinity was high. The nitrogen removal efficiency reached above 90% when the NH4(+)-N load was not exceed 0.15 kg/(kg.d). Elevation of the temperature availed to higher nitrogen removal efficiency, this efficiency doubled when the reaction temperature was changed from 20 degrees C to 30 degrees C. Relatively high value of pH, in the range of 7.5 and 8.5 had advantage to achieve effective shortened nitrification-denitrification which caused by the selective inhibition of free ammonia(FA).
Study on stability of shortcut nitrification by controlling DO and FA

Yu Deshuang,Yin Jinlan,Wang Xiaoxia,Li Ningning,

环境工程学报 , 2011,
Abstract: 采用SBR工艺以水产品加工废水为研究对象,同时控制进水游离氨(FA)为0.96~1.25mg!L,溶解氧(DO)为1~2mg/L,实现了稳定的短程硝化过程。在此条件下,亚硝化率及氨氮去除率分别大于95%和88%,有机物(COD)去除率在90%以上,亚硝化速率维持在0.9666×10^-3-1.0375×10^-3mgNO2-N/(mgMLSS·h)之间。研究结果表明,同时控制DO及FA在适当范围之内可以获得稳定的短程硝化过程,并可降低系统能耗。本实验采用较低的FA浓度与较高的DO浓度(与OLAND工艺比较)得到了稳定的短程硝化过程,对水产品加工废水处理具有重要应用价值。
Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs  [PDF]
Yaomei Hao, Xuan Chen, Shuang Hu, Xiaohong Bai, Deshuang Gu
American Journal of Analytical Chemistry (AJAC) , 2012, DOI: 10.4236/ajac.2012.310089
Abstract: Isomeric triterpenic acids of oleanolic acid (OA) and ursolic acid (UA) both have very low ultraviolet absorption and always exist in the same plant, so the separation and simultaneous determination of them have been a difficult task. In this study, a sensitive method combining dispersive liquid-liquid microextraction (DLLME) with HPLC-UV was developed for the extraction and determination of OA and UA in traditional Chinese medicinal herbs (CMHs). Variables influencing DLLME such as type and volume of extraction solvent, volume of dispersive solvent, ionic strength, aqueous phase pH, extraction time, centrifugation speed and time, and sample volume were investigated and optimized. Under the optimum conditions, both OA and UA attained favorable extraction efficiencies with enrichment factors 1378 and 933, respectively. The linear dynamic ranges of 0.07 - 30.4 μg?mL–1 for OA and 0.08 - 33.6 μg?mL–1 for UA were obtained with square correlation coefficients of 0.9963. The detection limits of OA and UA were both 0.02 μg?mL–1. The method recoveries ranged between 88.2% - 116.2% for OA and 85.7% - 108.2% for UA with the RSDs (n = 5) lower than 8.6%. The proposed method was successfully applied to concentrate and simultaneously determine these two triterpenic acids in Hedyotis diffusa and Eriobotrya japonica samples.
Experimental study on treatment of wastewater containing 50% seawater by MBR process

Li Jin,Yu Deshuang,Wang Qi,Li Ye,Ren Xiaojing,

环境工程学报 , 2009,
Abstract: 采用MBR工艺对含50%海水的污水生物处理进行了试验研究。实验条件为进水COD为300~2 600 mg/L,NH3-N为50~300 mg/L,pH值为6~9,混合液污泥浓度为7 000 mg/L,溶解氧浓度为2~4 mg/L,温度为20~25℃。试验结果表明,系统的最佳运行条件为:有机负荷<3.2 kg COD/(m3·d),氨氮负荷<0.35 kg/(m3·d),pH值在7.5~8.5之间,HRT>12 h。在此条件下,COD与氨氮的去除率可同时达到90%。高盐环境下微生物所分泌的大量胞外多聚物是造成MBR工艺处理含盐废水过程中膜污染的主要原因。
Control strategies of enhancing denitrifying phosphorus removal performance of the conventional Anaerobic-Anoxic-Oxic process

WANG Xiaolian,WANG Shuying,YU Deshuang,PENG Yongzhen,

环境科学学报 , 2006,
Abstract: The lab-scale anaerobic-anoxic-oxic (A2/O) process for treating brewage wastewater was investigated for one year. The aims of this work were to improve nutrient removal efficiency and save energy by enhancing denitrifying phosphorus removal performance of A2/O system. Three kinds of operational strategies were proposed and investigated, i.e. (1) controlling nitrate recirculation flow rate; (2) adjusting the volume ratio of anaerobic /anoxic/oxic zone; (3) introducing bypass flow into anoxic zone and redistributing the bypass flow ratio. The results showed that not only anoxic P uptake could be stimulated but also recirculation energy consumption could be saved when anoxic effluent NO-3N concentration was controlled between 1~3 mg?L-1; the optimal volume ratio of anaerobic /anoxic/aerobic zone in this system was 1/1/2; The TN removal efficiency could be improved significantly through the introduction bypass flow even if at low C/N ratio, the optimal value of bypass flow ratio was 0.32.
Data Communications Using Guided Elastic Waves by Time Reversal Pulse Position Modulation: Experimental Study
Yuanwei Jin,Yujie Ying,Deshuang Zhao
Sensors , 2013, DOI: 10.3390/s130708352
Abstract: In this paper, we present and demonstrate a low complexity elastic wave signaling and reception method to achieve high data rate communication on dispersive solid elastic media, such as metal pipes, using piezoelectric transducers of PZT (lead zirconate titanate). Data communication is realized using pulse position modulation (PPM) as the signaling method and the elastic medium as the communication channel. The communication system first transmits a small number of training pulses to probe the dispersive medium. The time-reversed probe signals are then utilized as the information carrying waveforms. Rapid timing acquisition of transmitted waveforms for demodulation over elastic medium is made possible by exploring the reciprocity property of guided elastic waves. The experimental tests were conducted using a National Instrument PXI system for waveform excitation and data acquisition. Data telemetry bit rates of 10 kbps, 20 kbps, 50 kbps and 100 kbps with the average bit error rates of 0, 5.75 × 10?4, 1.09 × 10?2 and 5.01 × 10?2, respectively, out of a total of 40, 000 transmitted bits were obtained when transmitting at the center frequency of 250 kHz and a 500 kHz bandwidth on steel pipe specimens. To emphasize the influence of time reversal, no complex processing techniques, such as adaptive channel equalization or error correction coding, were employed.
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