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Search Results: 1 - 10 of 64382 matches for " LIAO Cheng-jun "
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LIAO Cheng-jun,

天然气地球科学 , 2005,
Abstract: 辽河油田锦612复杂断块油藏下第三系沙河街组三段浊积砂砾岩储层厚度变化大,分布不稳定,纵、横向非均质性都很强。在油田开发阶段,地质工作者的任务是对油藏及其参数做出预测,落实储层横向变化特征,搞清油藏的非均质性特征,降低开发井部署风险。常规地面地震方法难以精确地用于落实井旁精细构造和预测岩性、储层横向变化。介绍了VSP(垂直地震剖面法)技术的基本原理、零偏和非零偏两个方面的数据采集与处理。以锦612-22-36和锦612-8-20两口井为例阐述了VSP资料的应用情况及效果。VSP技术大大提高了三维地震资料的分辨率,在地震剖面与地质层位之间架起了一座桥梁,准确地落实了锦612断块北部、西部断层的位置,搞清了储层在北部、西北部方向上的分布特征,为锦612断块油田扩边挖潜提供了重要的依据。
Bringing Reference Groups Back: Agent-based Modeling of the Spiral of Silence
Cheng-Jun Wang
Computer Science , 2013,
Abstract: The purpose of this study is threefold: first, to bring reference groups back into the framework of spiral of silence (SOS) by proposing an extended framework of dual opinion climate; second, to investigate the boundary conditions of SOS; third, to identify the characteristics of SOS in terms of spatial variation and temporal evolution. Modeling SOS with agent-based models, the findings suggest (1) there is no guarantee of SOS with reference groups being brought back; (2) Stable existence of SOS is contingent upon the comparative strength of mass media over reference groups; (3) SOS is size-dependent upon reference groups and the population; (4) the growth rate of SOS decreases over time. Thus, this research presents an extension of the SOS theory.
Ranking spreaders by decomposing complex networks
An Zeng,Cheng-Jun Zhang
Physics , 2012, DOI: 10.1016/j.physleta.2013.02.039
Abstract: Ranking the nodes' ability for spreading in networks is a fundamental problem which relates to many real applications such as information and disease control. In the previous literatures, a network decomposition procedure called k-shell method has been shown to effectively identify the most influential spreaders. In this paper, we find that the k-shell method have some limitations when it is used to rank all the nodes in the network. We also find that these limitations are due to considering only the links between the remaining nodes (residual degree) while entirely ignoring all the links connecting to the removed nodes (exhausted degree) when decomposing the networks. Accordingly, we propose a mixed degree decomposition (MDD) procedure in which both the residual degree and the exhausted degree are considered. By simulating the epidemic process on the real networks, we show that the MDD method can outperform the k-shell and the degree methods in ranking spreaders. Finally, the influence of the network structure on the performance of the MDD method is discussed.
Behavior patterns of online users and the effect on information filtering
Cheng-Jun Zhang,An Zeng
Computer Science , 2011, DOI: 10.1016/j.physa.2011.09.038
Abstract: Understanding the structure and evolution of web-based user-object bipartite networks is an important task since they play a fundamental role in online information filtering. In this paper, we focus on investigating the patterns of online users' behavior and the effect on recommendation process. Empirical analysis on the e-commercial systems show that users have significant taste diversity and their interests for niche items highly overlap. Additionally, recommendation process are investigated on both the real networks and the reshuffled networks in which real users' behavior patterns can be gradually destroyed. Our results shows that the performance of personalized recommendation methods is strongly related to the real network structure. Detail study on each item shows that recommendation accuracy for hot items is almost maximum and quite robust to the reshuffling process. However, niche items cannot be accurately recommended after removing users' behavior patterns. Our work also is meaningful in practical sense since it reveals an effective direction to improve the accuracy and the robustness of the existing recommender systems.
Modeling for Fan Delta Reservoir in Dujiatai,North of Huanxiling Oilfield

LIAO Cheng-jun,SONG Xing-wen,ZHANG Qing-long,

天然气地球科学 , 2008,
Abstract: The reservoir of Dujiatai in the north of Huanxiling Oilfield is of low porosity, low permeability and high heterogeneity. The characteristics of the reservoir and the microfacies in the study area was analyzed and researched. The characteristics of the microfacies, including underwater channel, underwater interfluve, debouch bar and sheet sand, were analyzed in the area. The microfacies model and the reservoir model of the study area were built up by using fine grid and lots of indicators in three target blocks. The results show that, under the control of the facies model, the reservoir model can show the underground facts better, and the model is fit for the work of developing the remaining oil.
Diaquabis(4-carboxy-2-ethyl-1H-imidazole-5-carboxylato-κ2N3,O4)zinc N,N-dimethylformamide disolvate
Cheng-Jun Hao,Hui Xie
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811012992
Abstract: In the title compound, [Zn(C7H7N2O4)2(H2O)2]·2C3H7NO, the ZnII ion, which lies on a center of inversion, is coordinated by two O atoms and two N atoms from two 4-carboxy-2-ethyl-1H-imidazole-5-carboxylato anions and two water O atoms in an octahedral environment, Each 4-carboxy-2-ethyl-1H-imidazole-5-carboxylato ligand adopts a bidentate chelating mode to the ZnII ion, forming two five-membered metalla rings. In the crystal, a two-dimensional framework parallel to (010) is formed by N—H...O and O—H...O hydrogen bonds.
Cheng-Jun Hao,Hui Xie
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812011014
Abstract: In the title complex, [Pr2(C2O4)3(H2O)4]n, the two independent PrIII ions are both nine-coordinated in a distorted monocapped square-antiprismatic geometry by seven O atoms from four oxalate ligands and two water molecules. The PrIII ions are bridged by the oxalate ligands, forming a layer parallel to (001). O—H...O hydrogen bonds connect the layers.
Xiao-Jun Zhao,Cheng-Jun Hao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681002800x
Abstract: The title compound, C12H8N2O4, crystallizes as a zwitterion in which the pyridyl N atom is protonated. The dihedral angle between the benzene and pyridinium rings is 27.9 (2)°. In the crystal, N—H...O hydrogen bonds link adjacent zwitterions into a three-dimensional structure.
Diaquabis(4-carboxy-2-propyl-1H-imidazole-5-carboxylato-κ2N3,O4)zinc(II) N,N-dimethylformamide disolvate
Cheng-Jun Hao,Xiao-Jun Zhao
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810022282
Abstract: In the crystal structure of the title compound, [Zn(C8H9N2O4)2(H2O)2]·2C3H7NO, the ZnII atom is coordinated by two N,O-bidentate 2-propyl-1H-imidazole-4,5-dicarboxylate anions and two water molecules in a distorted octahedral environment. The asymmetric unit consists of one ZnII atom located on a center of inversion as well as one anion, one water molecule and one additional dimethylformamide molecule that occupy general positions. Between the carboxyl and the carboxylate group an intramolecular hydrogen bond is found in which the hydroxy H atom is disordered. Disorder is also found for the H atoms of one of the three methyl groups. In the crystal structure, additional intermolecular N—H...O and O—H...O hydrogen bonding is found.
Study on the model of information transmission and controlling of the large-scale irrigated area based on information flow

WANG Cheng-jun,

计算机应用 , 2005,
Abstract: For further investigate the essential element of information expressed of large-scale irrigation area and constructs the overall model of irrigation area system, the system engineering method was used to analyses the information source and information flow of irrigated area. By this method, the connection and state between each element transmit the relation in the system was described systematically and a model of Information transmission and controlling of the large-scale irrigated area was constructed. The application of this model to the irrigation are informationization shows that this model has offered the feasible quantization model for realization and accurate control of the information system of irrigated area.
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