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Search Results: 1 - 10 of 120013 matches for " Jigang Wang "
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The Research for APG-12 Emulsifying Properties  [PDF]
Jigang Wang, Sitong Chen, Yongle Xin, Yong’an Wang
Open Journal of Composite Materials (OJCM) , 2015, DOI: 10.4236/ojcm.2015.51004
Abstract: Through determining and evaluating interfacial tension and emulsifying properties of dodecyl polyglucoside (APG-12), the results show that APG-12’s performance is better than C12 linear alkylbenzene sulfonate (LAS) and alkyl phenol polyoxyethylene ether (OP-10). In order to emulsify properties of APG-12, it is more stable when concentration is over 1.5 g/L. We studied the temperature and oil-water ratio has an effect on emulsifying property.
Time-Frequency Entropy Analysis of Arc Signal in Non-Stationary Submerged Arc Welding  [PDF]
Kuanfang He, Siwen Xiao, Jigang Wu, Guanbin Wang
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.32013
Abstract: The use of time-frequency entropy to quantitatively assess the stability of submerged arc welding process considering the distribution features of arc energy is reported in this paper. Time-frequency entropy is employed to calculate and analyze the stationary current signals, non-stationary current and voltage signals in the submerged arc welding process. It is obtained that time-frequency entropy of arc signal can be used as arc stability judgment criteria of submerged arc welding. Experimental results are provided to confirm the effectiveness of this approach.
The Synthesize and Property Evaluation of High Temperature Resistant Phenolic Resin-Type Profile Control Agent  [PDF]
Qingwang Liu, Hongwei Mu, Jigang Wang, Zhenzhong Fan
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.43019
Abstract:

Most of the mining method of domestic oilfield is waterflood development, thus the water content in the mid and late water flooding would rise faster, and the oil recovery rate would decline relatively more rapid. So it is very important to research profile control agent for stabilizing oil production resin-type profile control agent, and focus on researching the themal stability, shear resistance, gelation time and gelation strength and other properties of this profile control agent [1]. Finally, the best ratio for synthesizing the high temperature resistant phenolic resin-type profile control agent was obtained.

Synthesis and Characterization of APG-12  [PDF]
Jigang Wang, Yongle Xin, Danting Fan, Sitong Chen
Open Journal of Composite Materials (OJCM) , 2015, DOI: 10.4236/ojcm.2015.51003
Abstract: APG-12 was synthesized from n-dodecyl alcohol and glucose in catalysis system of p-Toluenesulfonic and phosphoric acid. Using the method of direct glycosidation, this paper discusses the impact of raw material ratio, catalyst dosage and reaction temperature on the synthesis. It is concluded that the synthesis of APG-12 best reaction process condition is the molar ratio of alcohol and glucose 7:1; the reaction temperature is 115 and the amount of catalyst is 1.3%, controlling the reaction pressure in 3 - 4 kPa. The resulting products are analyzed by infrared spectroscopy.
Performance Evaluation of a New Type of Polymer Profile Control Agent  [PDF]
Qingwang Liu, Zhe Zhang, Zhenzhong Fan, Zhenzhong Fan, Jigang Wang
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.65040
Abstract: The low-permeability oil and gas resources of our country are quite common and abundant. Their reserve has accounted for one-fifth of total oil reserves of our country, and their yield has constituted the important part of national petroleum annual yield, but its development is very difficult. Polymer gel technology is a technical method of improving sweep efficiency in recent years which substantially increases the viscosity of the polymer solution by adding a crosslinking agent to the polymer produced by intramolecular or intermolecular crosslinking.
High resolution bathymetry of China seas and their surroundings
Yong Wang,Houze Xu,Jigang Zhan
Chinese Science Bulletin , 2001, DOI: 10.1007/BF02900631
Abstract: Based on the oceanic lithospheric flexure and the worldwide bathymetric data ETOPO5, the high resolution bathymetry of the China seas and their surroundings is computed from altimeter derived gravity anomalies. The new bathymetry obtained by this study is higher resolution and accuracy than the widely used ETOPO5 data, meanwhile it shows clearly the seafloor, the tectonic characteristics and the geodynamical processes in the China seas.
Time-Frequency Entropy Analysis of Alternating Current Square Wave Current Signal in Submerged Arc Welding
Kuanfang He,Jigang Wu,Guangbin Wang
Journal of Computers , 2011, DOI: 10.4304/jcp.6.10.2092-2097
Abstract: The use of time-frequency entropy to quantitatively assess the stability of alternating current square wave submerged arc welding process considering the distribution features of arc energy is reported in this paper. Time-frequency entropy is employed to calculate and analyze the current signals under different duty cycle, frequency and welding speed in the submerged arc welding process. It is obtained that the greater time-frequency entropy, the less fluctuations, and the more stable welding process. Experimental results are provided to confirm the effectiveness of this approach.
The Synthesis and Evaluation of a Novel Inhibitor DN for Carbon Dioxide Corrosion  [PDF]
Qingwang Liu, Tong Zhang, Jigang Wang, Zhenzhong Fan, Ao Sun, Dong Cheng
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44023
Abstract: During the oil and gas wells exploitation and transportation, carbon dioxide corrosion is one of main reasons for the corrosion of metallic materials. So the methods of preventing and reducing carbon dioxide corrosion have become a widely focused problem. The foreign and domestic practices and experiences show that as an economic, effective and versatile metal corrosion control method, corrosion inhibitor protection technology is suitable for application in oil and gas transportation system. This paper, through the indoor experiment with benzyl chloride, using quinoline as raw materials, synthesizes a kind of quinoline quaternary ammonium salt. The obtained product benzyl chloride quinoline compounded with OP-10 and ethanol to get a novel inhibitor DN for carbon dioxide corrosion, and to evaluate its performance.
The Synthesis and Evaluation of Hydrophobic Association Thickener  [PDF]
Qingwang Liu, Dong Cheng, Jigang Wang, Zhenzhong Fan, Tong Zhang, Ao Sun
Open Journal of Composite Materials (OJCM) , 2015, DOI: 10.4236/ojcm.2015.51001
Abstract: The paper provides a new hydrophobic association polymer fracturing fluid gelatinizer. The hydrophobic association which is the synthesis of three component copolymer complexes, is compounded by micellar copolymerization method. The hydrophobic association is got together through hydrophilic monomer acrylamide monomer N,N-vinyl pyrrolidone monomer with a rigid group N, and hydrophobic monomer N,N-2 dodecyl acrylamide etc. three monomers with sodium dodecyl sulfate as the emulsifier in micellar solution.
Study on mapping Quantitative Trait Loci for animal complex binary traits using Bayesian-Markov chain Monte Carlo approach
Jianfeng Liu,Yuan Zhang,Qin Zhang,Lixian Wang,Jigang Zhang
Science China Life Sciences , 2006, DOI: 10.1007/s11427-006-2024-z
Abstract: It is a challenging issue to map Quantitative Trait Loci (QTL) underlying complex discrete traits, which usually show discontinuous distribution and less information, using conventional statistical methods. Bayesian-Markov chain Monte Carlo (Bayesian-MCMC) approach is the key procedure in mapping QTL for complex binary traits, which provides a complete posterior distribution for QTL parameters using all prior information. As a consequence, Bayesian estimates of all interested variables can be obtained straightforwardly basing on their posterior samples simulated by the MCMC algorithm. In our study, utilities of Bayesian-MCMC are demonstrated using simulated several animal outbred full-sib families with different family structures for a complex binary trait underlied by both a QTL and polygene. Under the Identity-by-Descent-Based variance component random model, three samplers basing on MCMC, including Gibbs sampling, Metropolis algorithm and reversible jump MCMC, were implemented to generate the joint posterior distribution of all unknowns so that the QTL parameters were obtained by Bayesian statistical inferring. The results showed that Bayesian-MCMC approach could work well and robust under different family structures and QTL effects. As family size increases and the number of family decreases, the accuracy of the parameter estimates will be improved. When the true QTL has a small effect, using outbred population experiment design with large family size is the optimal mapping strategy.
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