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Search Results: 1 - 10 of 80777 matches for " Qingwang Liu "
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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

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.

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.
Synthesis and Performance Evaluation of Organic Bentonite Modifier Dimethyldistearylammonium Bromide (DODMAB)  [PDF]
Qingwang Liu, Ao Sun, Zhenzhong Fan, Jiguang Wang, Tong Zhang, Dong Cheng
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44024
Abstract: Dimethyldistearylammonium Bromide (DODMAB) is a bentonite modifier with good performance. In this experiment, 1-Bromooctadecane is the raw material, and completes tertiary amination and quaternization successively by changing the condition of experiment. The result is that the productivity can achieve 78.94% in the synthesis of DODMAB. It has been used in the experiment of bentonite modification and achieves good results; compared with using trimethylstearylammonium bromide as the organic modifier, the synthetic organic bentonite has better performance than the common organic modifier when used in the oil base drilling fluid of oilfield operation.
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.
A Kind of Lidar Application Grid Based on eScience’s View
Deng Guang,Liu Qingwang,Li Zengyuan,Zhang Xu
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i5.1348
Abstract: eScience means sharing documents、information and knowledge in research team and makes convenience to cooperate working. Further more, eScience becomes a social research platform open to anyone who is interested in specifically subject and can easily participate in it. The goal of this paper is to put up a web based distributed forest lidar processing service for forest researchers. Through a dedicated web portal users can have easy and fast access to the different service regardless the place where they are physically located. The main forest stand average height extracting algorithm encapsulated to service is integrated in a grid based infrastructure by using SIGRE middleware and SIGApp middleware. The workflow of this experiment system and results are be set out and discussed.
Prediction of subtropical forest parameters using airborne laser scanner

FU Tian,PANG Yong,HUANG Qingfeng,LIU Qingwang,XU Guangcai,

遥感学报 , 2011,
Abstract: Light Detection and Ranging (LiDAR) is one of the most promising technologies in forestry, which shows potential for timely and accurate measurements of forest biophysical properties over time. This study explores several regression models relating variables derived from airborne laser scanner for the estimation of various forest metrics, and discusses the results of prediction concluding accuracy. These prediction models use 78 plots with radius of 7.5 m or 15 m in Kunming, Yunnan province, China. Two series of variables are provided from the airborne laser scanner data, one is canopy height and to the other canopy density. These variables are used as independent variables in the regressions. The stepwise regression analysis has been used to select various independent variables. The results show high correlation between forest metrics and variables derived from airborne laser scanner. For the three different forest types (coniferous, broad-leaf and mixed), all the prediction of mean heights are accurate. However, for the predictions of above ground biomass, the result of coniferous is better than broad-leaf, while there is no signifi cant correlation between the biomass of mixed and the laser variables. Finally, the results of regression and factors affect the accuracy of prediction are discussed. The accuracy of prediction may be relate to the forest type, sampling time and density of laser scanning and position errors.
Regional Forest Canopy Height Estimation Using Multi-source Remote Sensing Data

胡凯龙, 刘清旺, 崔希民, 庞勇, 穆喜云
HU Kailong
, LIU Qingwang, CUI Ximin, PANG Yong, MU Xiyun

- , 2018, DOI: 10.13203/j.whugis20160066
Abstract: 结合机载LiDAR数据,提出了一种改进的GLAS光斑点冠层高度地形校正模型,以校正后的GLAS光斑点作为输入样本,结合MODIS遥感影像,利用支持向量回归(SVR)的方法对研究区森林冠层高度进行分生态区估测,并利用野外调查数据和机载LiDAR冠层高度结果对估测结果进行验证。结果显示:研究区的坡度等级直接影响GLAS光斑点森林冠层高度估测精度,改进的地形校正模型可以较好的减小坡度对GLAS光斑点森林冠层高度估测的影响,模型精度RMSE稳定在3.25~3.48 m;不同生态分区的SVR模型估测精度较为稳定,其RMSE=6.41~7.56 m;与算数平均高相比,样地的Lorey's高与制图结果拟合最好,不同生态分区平均估测精度为80.3%。机载LiDAR冠层高度结果的验证平均精度为79.5%,和Lorey's高验证结果呈现较好的一致性
On the foundation of rights and the characteristics of intergenerational trust of environmental resources

YANG Qingwang
, TAO Huaqiang

- , 2015, DOI: 1672-3104(2015)05-0086-08
Abstract: 摘 要: 环境资源保护的权利基础是一个动态的演变过程,在“风险社会”下发展为“后代人生活和发展模式选择权”。当代人对后代人享有环境资源权利所负有的保有义务,信托制度发展的新动向决定了建立环境资源代际信托法律制度的必然性和可能性。这种新型的环境资源代际信托具有公益信托、宣言信托、他益信托、积极信托、不可撤销信托的多重属性,由此有效解决了环境资源代际信托法律制度建构面临的“双向互惠性特征”“信托财产扩大化”和“后代人身份不确定”三大难题,并从根本上决定了制度建构的基本要求。
Abstract: The foundation of rights of intergenerational trust of environmental resources is a dynamic evoluving process towards “selective rights of living and developing patterns of later generations” in “risk society.” The contemporaries shoulder obligations to preserve environmental resources for later generations, and new developing trends in trust system provide theoretical as well as practical inevitability and probability for constructing legal mechanisms of intergenerational trust of environmental resources. This new type of intergenerational trust of environmental resources bear many features including charitable trust, declaration trust, altruistic trust, active trust, and irreversible trust. These features help solve effectively three difficulties in the legal construction of the intergenerational trust of environmental resources, namely, mutual reciprocity, the enlargement of the trusted property, and the uncertainty of the identity of the next generation, hence resolving essentially the basic requirements for the construction of the system
Accounts in Organizations

Wei Qingwang,Zheng Quanquan,

心理科学进展 , 2007,
Abstract: Accounts in organizations are explanations used in organizational contexts. When exploring the mitigating effect of accounts on organizational predicament, some researchers used impression management theory and attribution theory, others used interactional justice theory or fairness theory. In research method, situated experiments were added to the critical incident method and lab experiments. Although most researches emphasized the positive effects of accounts on reducing the unfavorable consequences of organizational predicaments, accounts could backfire and had side effects sometime. The authors also discussed the applicable significance of accounts.
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