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Search Results: 1 - 10 of 25691 matches for " Dezhi Cheng "
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Considerations on Research of Environmental Risk Prevention and Control in “12th Five-Year Plan” Period  [PDF]
Pengli Xue, Xiaofeng Sun, Yun Song, Yanjun Cheng, Dezhi Sun
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2013, DOI: 10.4236/cweee.2013.22B012
Abstract: Along with the environmental pollution causes complexity and diversity increases ceaselessly, “national environmental protection” Twelfth Five “planning” (hereinafter referred to as “planning”) will be the environmental risk prevention as the “12th Five-Year Plan” one of the important tasks, including advancing environmental risk management in the whole process, key areas the environmental risk prevention measures. The whole process environmental risk management covers a risk source recognition, receptor vulnerability assessment, environmental risk characterization, risk decision and risk assessment of accident loss. This article from the environmental risk source classification, environmental risk classification management, environmental emergency response and environmental risk and insurance environment four aspects put forward the “12th Five-Year Plan” whole process environmental risk management content, to further reduce our country environmental pollution accident risk and policy makers to provide some decision support.
Pretreatment of heterocyclic pesticide wastewater using ultrasonic/ozone combined process

Xiong Zhenglong,Cheng Xiang,Sun Dezhi,

环境科学学报(英文版) , 2011,
Abstract: Ultrasonic/O3 combined process was employed to pretreat heterocyclic pesticide wastewater for increasing biodegradability and reducing biological toxicity. Influences of ultrasonic frequency, ultrasonic power, probe diameter, initial pH and O3 dosage on the COD removal were studied. The results showed that the ultrasonic/O3 process significantly improved the biodegradability and reduced the biological toxicity of the wastewater. The ratio of BOD5/COD was increased from 0.03 to 0.55 and the EC50 increased from 11% to 52% under ultrasonic/O3 treatment. Low ultrasonic frequency brought better COD removal. Initial pH was found to have a high influence on the COD removal and alkaline conditions were more favorable. The influences of ultrasonic power and probe diameter were small. With an increase in O3 dosage, COD removal was e ectively improved. The optimal operational parameters for the combined process on COD removal were ultrasonic frequency 20 kHz, initial pH 9.00, ultrasonic power 300Wand dosage of O3 454.8 mg/(L min), under which the e ciency of COD removal reached 67.2%.
Improvement of Chen-Zhang-Liu’s IRPB Signature Scheme  [PDF]
Dezhi Gao
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.29064
Abstract: Restrictive partially blind signatures incorporate the advantages of restrictive blind signatures and partially blind signatures, which play an important role in electronic commerce. Recently, Chen-Zhang-Liu first proposed an ID-based restrictive partially blind (IRPB) signature from bilinear pairings. Later, Hu-Huang showed that the Chen-Zhang-Liu’s scheme has a security weakness, and pointed out that their scheme does not satisfy the property of restrictiveness as they claimed. In this paper, we improve Chen-Zhang-Liu’s scheme and propose a new signature scheme from bilinear pairings. The improved scheme can resist the Hu-Huang’s attack.
Some Results on a Double Compound Poisson-Geometric Risk Model with Interference  [PDF]
Dezhi Yan
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.21008
Abstract: In this paper, we study the actual operating of an insurance company with random income. A double compound Poisson-Geometric risk model with interference was established. By using the martingale method, the adjustment coefficient equation, the formula and the upper bound of ruin probability, the time to reach a given level in this new risk mo- del were obtained.
The Novel Interaction Model of Dark Energy and Dark Matter  [PDF]
Dezhi Hu
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.62013
Abstract: The paper introduces Planck scale into the Newtonian law of gravity for the model simplification. The terms of Newtonian gravitational force can be separated into two parts, namely Dark Matter and Dark Energy respectively. They are inverse relation to the distance. In the very early Universe, the novel model gives the sum “attractive force” of all matters in the cosmos. It indicates that Inflationary Universe firstly and then Universe expands slowly on condition that the accelerated velocity is slowing down for ever. In the galaxy scale, the paper gets the local “attractive force” of different galaxies by using the novel interaction model. It shows the intercommunity property in the formation process of different galaxies, where the matter suppresses firstly, sharp inflates secondly, slowly expands finally. Otherwise, the novel interaction model solves the problem about the flat rotation curves of galaxy by considering the change of the mass ratio of Dark Energy and Dark Matter. All results of simulation show that the core of our Universe is hollow now.
Biodecolorization and partial mineralization of Reactive Black 5 by a strain of Rhodopseudomonas palustris

WANG Xingzu,CHENG Xiang,SUN Dezhi,Qi Hong,

环境科学学报(英文版) , 2008,
Abstract: A strain of photosynthetic bacterium, Rhodopseudomonas palustris W1, isolated from a lab-scale anaerobic moving bed biofilmreactor (MBBR) treating textile effluent was demonstrated to decolodze Reactive Black 5 (RB5) efficiently under anaerobic condition.By a series of batch tests, the suitable conditions for RB5 decolorization were obtained, namely, pH<10, light presence, glutamine orlactate as carbon source with concentration more than 500 mg/L when lactate is selected, NH4Cl as a nitrogen source with concentrationmore than 100 mg/L, NaCI concentration not exceeding 5%, and RB5 concentration less than 700 mg/L. In addition, ultraviolet-visible(UV-Vis) spectrum scan and High Performance Liquid Chromatography/Mass Spectrometry (HPLC-MS) were used to analyze themetabolites of RB5 decolorization of W1. The results showed that partial aromatic amines produced with RB5 reduction were furtherdegraded during the extended period. Anaerobic partial mineralization of RB5 was suggested, and a possible degradation pathway wasproposed.
What Makes it Difficult to Understand a Scientific Literature?
Mengyun Cao,Jiao Tian,Dezhi Cheng,Jin Liu,Xiaoping Sun
Computer Science , 2015,
Abstract: In the artificial intelligence area, one of the ultimate goals is to make computers understand human language and offer assistance. In order to achieve this ideal, researchers of computer science have put forward a lot of models and algorithms attempting at enabling the machine to analyze and process human natural language on different levels of semantics. Although recent progress in this field offers much hope, we still have to ask whether current research can provide assistance that people really desire in reading and comprehension. To this end, we conducted a reading comprehension test on two scientific papers which are written in different styles. We use the semantic link models to analyze the understanding obstacles that people will face in the process of reading and figure out what makes it difficult for human to understand a scientific literature. Through such analysis, we summarized some characteristics and problems which are reflected by people with different levels of knowledge on the comprehension of difficult science and technology literature, which can be modeled in semantic link network. We believe that these characteristics and problems will help us re-examine the existing machine models and are helpful in the designing of new one.
Effect of sulfate on anaerobic biodecolorization of azo dyes
硫酸盐在偶氮染料厌氧生物脱色中的作用

Wang Xingzu,Sun Dezhi,Cheng Xiang,
王兴祖
,孙德智,程翔

环境工程学报 , 2012,
Abstract: The effect of sulfate on anaerobic biodecolorization of Reactive Black 5(RB5) and Direct Yellow 11(DY11) by Rhodopseudomonas palustris W1 was investigated.Results showed that sulfate did not affect the decolorization process,whereas its reduction product,sulfide,greatly stimulated chemical decolorization of both of two dyes in the presence of redox mediators,which can be completed in 3 min.Without external supplement of redox mediators,RB5 decolorization can also be accelerated by sulfide with redox mediators from RB5 degrdation,however,no similar acceleration was observed in DY11 decolorization due to the lack of redox mediators production.Furthermore,elemental sulfur resulting from the oxidation of sulfide was biotransformed to sulfide again to reduce azo dyes repeatedly.
Altered Spontaneous Brain Activity in Patients with Parkinson’s Disease Accompanied by Depressive Symptoms, as Revealed by Regional Homogeneity and Functional Connectivity in the Prefrontal-Limbic System
Ke Sheng, Weidong Fang, Meilan Su, Rong Li, Dezhi Zou, Yu Han, Xuefeng Wang, Oumei Cheng
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0084705
Abstract: As patients with Parkinson’s disease (PD) are at high risk for comorbid depression, it is hypothesized that these two diseases are sharing common pathogenic pathways. Using regional homogeneity (ReHo) and functional connectivity approaches, we characterized human regional brain activity at resting state to examine specific brain networks in patients with PD and those with PD and depression (PDD). This study comprised 41 PD human patients and 25 normal human subjects. The patients completed the Hamilton Depression Rating Scale and were further divided into two groups: patients with depressive symptoms and non-depressed PD patients (nD-PD). Compared with the non-depressed patients, those with depressive symptoms exhibited significantly increased regional activity in the left middle frontal gyrus and right inferior frontal gyrus, and decreased ReHo in the left amygdala and bilateral lingual gyrus. Brain network connectivity analysis revealed decreased functional connectivity within the prefrontal-limbic system and increased functional connectivity in the prefrontal cortex and lingual gyrus in PDD compared with the nD-PD group. In summary, the findings showed regional brain activity alterations and disruption of the mood regulation network in PDD patients. The pathogenesis of PDD may be attributed to abnormal neural activity in multiple brain regions.
A Novel Robust Backstepping Control for Nonaffine Nonlinear Processes and Application to An Active Magnetic Bearing System
Dezhi Xu
International Journal of Computer Science Issues , 2013,
Abstract: In this paper, a novel continuous-time robust nonlinear control scheme, is proposed for nonaffine nonlinear systems with unknown uncertainties/disturbance, which is based on backstepping methodology and sliding mode control technique. Firstly, a novel approximation technique is developed to approximate the nonaffine nonlinear dynamic systems. Then, the robust backstepping control for nonaffine nonlinear systems is proposed via the novel approximation technique. In the controller design procedure, the sliding model control method is introduced to avoid the possibility of the over parameterization problem and deal with the unknown uncertainties/disturbance. And, a second-order sliding mode integral filter is employed to facilitate the development of the derivation of the virtual control input with uncertainty terms included. Finally, the designed robust control strategy is applied to three-pole active magnetic bearing system, and simulation results are provided to demonstrate the effectiveness of the theoretic results obtained.
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