http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effects of pore clusters on the permeability, formation factor and porosity exponent of porous media
Haitao Wang 한국자원공학회 2020 Geosystem engineering Vol.23 No.2
Micropore and pore evolution both severely influence pore structure and transport properties. The micropore connects isolated pores to predominate connected pore cluster while the pore evolution generates isolated pores. Therefore, investigating separate impacts of predominate and remaining pore clusters is the first step to modify the existing electrical resistivity and permeability models with consideration of the micropore and pore evolution. The main pore clusters in six porous media including sandstone and carbonate were first extracted. Then, the pore geometry, topology, electrical resistivity and permeability from the main pore cluster compared with them from all the pore clusters in the same porous medium. The calculations of pore morphological and the petrophysical properties were all based on the pore networks extracted from the porous media by maximal ball method. The predominant pore cluster mainly determined the pore geometry, electrical resistivity and permeability of the corresponded porous medium. However, the isolated pore clusters from pore evolution undermined the pore connectivity. The developments of the remaining pore clusters slightly affected the electrical resistivity and permeability while seriously impacted the porosity exponents. Therefore, the micropore could increase the pore connectivity, and then slightly increase the permeability and reduce the electrical resistivity.
Haitao Wang 한국자원공학회 2019 Geosystem engineering Vol.22 No.5
The interpretation of electrical resistivity for assessing the saturation in rocks with complicated pore structures and various pore types requires the intrinsic parameters quantifying pore structures incorporated in modified resistivity models. Therefore, the objectives are to investigate pore types effect on the pore morphology and electrical resistivity and to determine the key pore morphological parameters for each pore type. The maximal ball method was applied to extract the pore networks of the reconstructed pore-scale models using a process-based method, and the pore morphology was characterized using a pore-network analysis and a random walk simulation. The resistivity was simulated using a finite element method. The key parameters determined by the Morris screening method for the fractured, isolated and connected vuggy models were the Euler number, the cross-sectional pore-to-throat area ratio (PTAR) and the pore radius, respectively. The qualitative relationships between the Euler number, the PTAR and the porosity exponent for the fractured and vuggy models were determined and validated using three Coquinas carbonates. This investigation will help to elucidate the variations of the porosity exponent and to further derive a new electrical resistivity model that correlates the pore morphology to the resistivity in fractured and vuggy carbonate reservoirs.
Haitao Liu,Dong Wang,Xinqiang Yi 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.3
The multiphase independent winding induction motor (MIWIM) has wide application in AC drive systems of high control redundancy necessary to ships and coal mines. An accurate analysis of its phase loss transient process is a prerequisite for the phase loss fault-tolerant control. When a phase loss occurs, the internal magnetic fi elds of the MIWIM are asymmetric. In this case, conventional coordinate transformation or resultant space vector cannot be used to reduce the mathematical model of the motor phase loss to a lower order. Using a fi ve-phase induction motor as an object of study, this paper presents a full-order mathematical model suitable for the asymmetric state in the α – β –z1–z2–z3 coordinate system. The factor analysis of the frequency domain and no consideration of its small value make it possible to reduce the order of the analytical model. According to the constraint relationship between voltage and current, an analytical analysis is made of the motor dynamic characteristics after a phase loss. The results are in agreement with those of numerical simulation and experiment, which verify that the phase loss asymmetric transient model and analytic method of the MIWIM are feasible and eff ective.
Modified Slip Surface Stress Method for Potential Slip Mass Stability Analysis
Haitao Zhang,Xianqi Luo,Jinfeng Bi,Zijing Guo 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.1
A modified slip surface stress method is proposed with the concept of vector sum and rigorous force analysis. Theoretically, the proposed method could degenerate into the existing methods by adding the corresponding assumptions. Through five typical slope cases, comparisons are made among the Factor of Safety (FoS) calculated by the proposed method and others. Results show that the proposed method could evaluate slopes at the limit state. Moreover, the proposed method is capable to calculate the FoS of the potential slip mass for both homogeneous and heterogeneous cases with regular or irregular slip surface in both two- and three-dimension spaces. Also, the proposed method could give the potential slip direction of a slope, which is useful for the design of measures to reinforce the slope.
Research on Analysis of Sports Video based on the Statistics
Haitao Yang,Jia Wang,Jingmeng Sun 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.12
We turn to statistical-based methods and propose a statistical inference approach by using Dynamic Bayesian Network, which is able to learn automatically from data set. By soccer video analysis is as an example, the proposed method is verified by experiment. We extract the color, shape and other low-level features from the video, to detect and identify 5 kinds of high-level semantic events using dynamic Bayesian network model. The experimental results show that our method is effective.
Haitao Li,Yang Sun,최형진,Siqin Zhao 한국고분자학회 2018 Macromolecular Research Vol.26 No.9
Hierarchical architectures of poly(methyl methacrylate) (PMMA)/aminofunctionalized multi-walled carbon nanotube (MWNT-NH2) particles were prepared, in which the electrical conductive network was constructed on the surface of PMMA microspheres. The morphology, composition, and electrical conductivity of the particles were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and four-probe electrical conductivity measurement. The PMMA/MWNT-NH2 transducers were exposed to each ethanol, water, toluene, and chloroform for volatile organic compounds (VOCs) sensing detection. The particles showed excellent sensitivity, good reversibility, and a strong response compared to the raw MWNTs and MWNT-NH2. This was attributed not only to the formation of a charge transmission path on the particle surface, but also to the interaction between the vapor molecules and functionalized MWNTs. The enhanced sensing performance of the PMMA/MWNT-NH2 particles suggests that it is a good candidate for the preparation of electronic noses for disease diagnostics and VOCs detection.
Haitao Zheng,Meng Wang,Lixin Jiang,Haidi Chu,Jinchen Hu,Jinyao Ning,Baoyuan Li,Dong Wang,Jie Xu 대한암학회 2016 Cancer Research and Treatment Vol.48 No.2
Purpose The importance of long noncoding RNAs (lncRNAs) in tumorigenesis has recently been demonstrated. However, the role of lncRNAs in development of thyroid cancer remains largely unknown. Materials and Methods Using quantitative reverse transcription polymerase chain reaction, expression of three lncRNAs, including BRAF-activated long noncoding RNA (BANCR), papillary thyroid cancer susceptibility candidate 3 (PTCSC3), and noncoding RNA associated with mitogen-activated protein kinase pathway and growth arrest (NAMA), was investigated in the current study. Results Of the three lncRNAs (BANCR, PTCSC3, and NAMA), expression of BANCR was significantly up-regulated while PTCSC3 and NAMA were significantly down-regulated in papillary thyroid carcinoma (PTC) compared to that in normal tissue. BANCR-knockdown in a PTC-derived cell line (IHH-4) resulted in significant suppression of thyroid stimulating hormone receptor (TSHR). BANCR-knockdown also led to inhibition of cell growth and cell cycle arrest at G0/G1 phase through down-regulation of cyclin D1. In addition, BANCR was enriched by polycomb enhancer of zeste homolog 2 (EZH2), and silencing BANCR led to decreased chromatin recruitment of EZH2, which resulted significantly reduced expression of TSHR. Conclusion These findings indicate that BANCR may contribute to the tumorigenesis of PTC through regulation of cyclin D1 and TSHR.
An Approach of Information Extraction Based on Dom Tree and Weight Value
Haitao Wang,Shufen Liu 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10
Eliminating noisy information and extracting information content from web pages are increasing to become an important research issue in information retrieval field. In this paper, we present an approach of information extraction based on Dom tree and weight value calculation, which contains the following steps, parse the web page to construct the Dom tree, extract the title and keywords, calculate the weight value and obtain the content. The experimental result shows that this method has the higher accuracy ratio by the various themes content extraction.