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Search Results: 1 - 10 of 17297 matches for " PEI Gang "
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Synthesis of Novel Asymmetric Zinc (II) Phthalocyanines Bearing Octadecyloxyl and Glucosyl Groups
Pei Zhang,Shufen Zhang,Gang Han
Molecules , 2009, DOI: 10.3390/molecules14093688
Abstract: A novel asymmetric zinc (II) phthalocyanine substituted by one lipophilic octadecyloxyl group and three hydrophilic glucosyl groups was synthesized. Using Q-TOF MS, the major byproducts formed during the deprotection processes were identified. An improved procedure was worked out to convert these byproducts to the desired product in quantitative yield.
Experiment and Analysis on Flue Gas Low Temperature Corrosion Monitoring  [PDF]
Xiaona Song, Changshun Zhang, Pei Li, Jun Zheng, Yanping Hu, Xiaoxia Hou, Gang Xu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B262
Abstract:

Thermal loss of exhaust flue gas accounts for the largest proportion of the total boiler thermal loss. Nowadays in China, the exhaust gas temperature in many thermal power plants is much higher than the designed value, thus, the recycle and reuse of the waste heat of tail flue gas is necessary. However, lower exhaust gas temperature will aggravate low temperature corrosion of the tail heating surface, which also causes huge economic losses. In order to solve this problem, this paper designs a monitoring experiment platform of flue gas low temperature corrosion, which can measure the corrosion condition of different materials by different flue gas compositions and temperature corrosion speeds. Besides, effects of low temperature corrosion factors are analyzed to find the best exhaust gas temperature and the surface material of tail heating surface.

Research on the High Strength Glass Ceramics/Mullite Ceramics Composites  [PDF]
Yi Jun Liu, Jian Feng Huang, Xiu Feng Wang, Qiang Yang, Ya Qin Wang, Pei Wen Rao, Qing Gang Wang
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.12009
Abstract: In order to improve the bending strength of mullite ceramic thin tiles, SiO2-ZnO-Na2O-Y2O3 glass was prepared on the surface of the tiles. The influences of the thermal properties and thermal expansion coefficient of the glass and the sintering temperature on the structure and the property of the composites were investigated by differential thermal analysis (DTA), X-Ray Diffraction (XRD), Raman and scanning electron microscopy (SEM). The bending strength of the composites was measured with an universal testing machine. Results show that the crystallization temperature of the SiO2-ZnO-Na2O-Y2O3 glass is higher than that of SiO2-ZnO-Na2O glass. The corresponding crystallites show more complex structure for the SiO2-ZnO-Na2O-Y2O3 glass. The thermal expansion coefficients of both glasses are lower than the mullite ceramic tiles. The bending strength of the composites after sintering at 1150°C was obviously improved by 10.7% to 106.2 MPa, compared with the mullite ceramic tiles.
Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)
Gang Pei,Guiqiang Li,Xi Zhou,Jie Ji,Yuehong Su
Energies , 2012, DOI: 10.3390/en5040911
Abstract: Evacuated tube solar water heater systems are widely used in China due to their high thermal efficiency, simple construction requirements, and low manufacturing costs. CPC evacuated tube solar water heaters with a geometrical concentration ratio C of less than one are rare. A comparison of the experimental rig of evacuated tube solar water heater systems with and without a mini-CPC reflector was set up, with a series of experiments done in Hefei (31°53'N, 117°15'E), China. The first and second laws of thermodynamics were used to analyze and contrast their thermal performance. The water in the tank was heated from 26.9 to 55, 65, 75, 85, and 95 °C. Two types of solar water heater systems were used, and the data gathered for two days were compared. The results show that when attaining low temperature water, the evacuated tube solar water heater system without a mini-CPC reflector has higher thermal and exergy efficiencies than the system with a mini-CPC reflector, including the average and immediate values. On the other hand, when attaining high temperature water, the system with a mini-CPC reflector has higher thermal and exergy efficiencies than the other one. The comparison presents the advantages of evacuated tube solar water heater systems with and without a mini-CPC reflector, which can be offered as a reference when choosing which solar water system to use for actual applications.
Gravity Anomaly Separation based on Bidimensional Empirical Mode Decomposition
Yao Pei,Yan-Gang Wu,Da-Cheng Jia
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Empirical Mode Decomposition is a time-frequency analysis method which can adaptive decomposition of complex signals. This article proposed the bidimensional empirical mode decomposition based on the calculation principle of empirical mode decomposition and the structural characteristics of the regional gravity anomaly. This method can be applied to the separation of gravity anomalies. The intrinsic mode functions of different scales contain various bands of compositions, then obtained the depth of field source by Power spectrum of radial average logarithmic. Compared with the conventional methods, such as the upward continuation method in the potential field separation method, we don't need to set any parameters beforehand. The application shows that in DaolangheDuge area: the multi-scale component based on bidimensional empirical mode decomposition could reflect the anomaly source form from shallow to deep. The field source of local gravity high value in the depth of less than 200 m, The field source of area gravity anomaly in the depth of 500 m, the base form is slope towards the North East which northwest high to southeast low.
Hydrothermal Synthesis and Thermoelectric Properties of New Oxides (Ca0.85-xNdxOH)1.16CoO2
PEI Jian, CHEN Gang, WANG Qun, JIN Ren-Cheng
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.00669
Abstract: Plate-like particles of (Ca0.85OH)1.16CoO2 were prepared in which Nd was partially substituted for Ca to improve the thermoelectric performance. The values of Seebeck coefficient of as-synthesized oxides are all positive, showing that these oxides are p-type materials. The electrical conductivity initially decreases then increases with increasing Nd-doped amount, which is the coeffect of carrier concentration and carrier mobility. The Seebeck coefficient increases with the increasing Nd-doped amount below 473K. The power factor reaches 7.06×10-5 W/(m·K2) at 573K for (Ca0.75Nd0.1OH)1.16CoO2.
Large Dimuon Asymmetry In Bs-bar B_s Mixing From Unparticle Indced Gamma^{12}_s
Bo Ren,Xiao-Gang He,Pei-Chu Xie
Physics , 2010, DOI: 10.1016/j.physletb.2011.03.001
Abstract: Exchange of unparticle stuff of dimension $d_\U$ with FCNC interaction can induce $M^{12,u}$ and $\Gamma^{12,u}$ causing meson and anti-meson mixing with the relation $\Gamma^{12,u}/M^{12,u} = 2 \tan(\pi d_\U)$. We show that this type of unparticle contribution can provide the much needed large $\Gamma^{12}_s$ to explain the recently observed anomalously large dimuon asymmetry in $B_s -\bar B_s$ system reported by D0 collaboration. The same interaction can also accommodate large mixing induced CP violation in $B_s \to J/\psi \phi$ indicated by CDF and D0 data. Experimental data can provide constraints on the unparticle dimension and scale.
Research on the Tail Dependence of Agriculture Listed Companies
Pei-song Mu,Xun-gang Zheng,Xun-gang Zheng
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n2p111
Abstract: Based on the Conditional Probability Model of Gumbel-H Copula and Clayton Copula distribution function to measure the tail dependence of financial asset, and the interior relationship between these two types of Copula distribution functions and Kendall?, this article calculates the tail dependence of agricultural listed companies in Shanghai and Shenzhen by the non-parametric estimation method. The results shows that the tail dependence is existed between Shanghai and Shenzhen listed companies in agriculture, and the four kinds of listed companies in Shanghai which are farming, forestry, animal husbandry and fishery respectively have the tail dependence with the same four kinds of companies in Shenzhen. In addition, all tail dependence is asymmetry.
A Semi-Random Multiple Decision-Tree Algorithm for Mining Data Streams
A semi-random multiple decision-tree algorithm for mining data streams

Xue-Gang Hu,Pei-Pei Li,Xin-Dong Wu,Gong-Qing Wu,
Xue-Gang Hu
,Pei-Pei Li,Xin-Dong Wu,and Gong-Qing Wu

计算机科学技术学报 , 2007,
Abstract: Mining with streaming data is a hot topic in data mining.When performing classification on data streams, traditional classification algorithms based on decision trees,such as ID3 and C4.5,have a relatively poor efficiency in both time and space due to the characteristics of streaming data.There are some advantages in time and space when using random decision trees.An incremental algorithm for mining data streams,SRMTDS(Semi-Random Multiple decision Trees for Data Streams),based on random decision trees is proposed in this paper.SRMTDS uses the inequality of Hoeffding bounds to choose the minimum number of split-examples,a heuristic method to compute the information gain for obtaining the split thresholds of numerical attributes,and a Naive Bayes classifier to estimate the class labels of tree leaves.Our extensive experimental study shows that SRMTDS has an improved performance in time,space,accuracy and the anti-noise capability in comparison with VFDTc,a state-of-the-art decision-tree algorithm for classifying data streams.
Why “Ding-Dong Community” Cannot Succeed Like American Version “Nextdoor”?  [PDF]
Pei Deng
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.84065
Abstract: The conception of community O2O is very popular currently in China, which has become the focus of attention in the field of e-commerce. However, since at the preliminary exploration stage everything in this area changes very quickly, there is not yet mature business model to mimic. Many of the problems should be studied and clarified. Taking the rise and failure of “ding-dong district” as a case, this article attempts to analyze the unsuccessful reason that “ding-dong district” imitates the US version “Nextdoor” in the context of China, and put forward the corresponding countermeasures and suggestions, aiming to provide related reference for Chinese enterprises in the exploration and development of community e-commerce.
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