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Search Results: 1 - 10 of 36702 matches for " DONG Mei "
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The Maximum Power Tracking Method and Reactive Compensation Simulation Research Based on DIgSILENT  [PDF]
Wei Guo, Dong-mei Zhao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B077
Abstract: This paper studies about the mechanical part of wind turbine and wind generator operation stability.1) It makes a comparative study of two control methods for maximum power tracking: curve fitting method and hill climbing algorithm, sets up improved control modules in DIgSLIENT and makes comparison research, thus gets the conclusion that the improved control modules of hill climbing algorithm has good effect on MPPT, and it is more desirable in the condition of steady wind. 2) This paper sets up SVC and STATCOM models and improved control modules in DIgSLIENT, which are connected to wind power system, verifying the validity of SVC and STATCOM models, and verifying its influence on wind power plant and system. The results of the study show that STATCOM is more helpful in voltage recovery when large disturbance of three-phase short-circuit happened in wind power grid, reactive compensation is more effective.
1-(3,3-Dichloroallyloxy)-4-methyl-2-nitrobenzene
Dong-mei Ren
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812023057
Abstract: In the title compound, C10H9Cl2NO3, the dihedral angle between the benzene ring and the plane of the nitro group is 39.1 (1)°, while that between the benzene ring and the plane through the three C and two Cl atoms of the dichloroallyloxy unit is 40.1 (1)°. In the crystal, C—H...O hydrogen bonds to the nitro groups form chains along the b axis. These chains are linked by inversion-related pairs of Cl...O interactions at a distance of 3.060 (3) , forming sheets approximately parallel to [-201] and generating R22(18) rings. π–π contacts between benzene rings in adjacent sheets, with centroid–centroid distances of 3.671 (2) , stack molecules along c.
5-Chloro-2-nitrophenol
Dong-mei Ren
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812014638
Abstract: The asymmetric unit of the title compound, C6H4ClNO3, contains two independent molecules in which the dihedral angles between the benzene ring and the nitro groups are 2.5 (1) and 8.5 (1)°. Intramolecular O—H...O hydrogen bonds involving the hydroxy and nitro substituents result in the formation of S(6) six-membered rings. In the crystal, O—H...O, O—H...Cl and C—H...O hydrogen bonds together with Cl...O contacts [3.238 (3) and 3.207 (3) ] generate a three-dimensional network.
Translation of Chapter Titles from the Perspective of Sociosemiotics
Mei DONG,Yushan ZHAO
Studies in Literature and Language , 2012, DOI: 10.3968/j.sll.1923156320120501.1257
Abstract: A chapter title as the title for every chapter in a chapter novel is to introduce the whole chapter. A research will be made on the translation techniques of chapter title from the perspective of Sociosemiotics. Sociosemiotics as an interdisciplinary science is dedicated to the research on the relationship between systems of signs and human society. Moreover, Sociosemiotics views language as the most comprehensive system of signs in the human society. Compared with other linguistic theories, Sociosemiotics pays more attention to the application of symbolic systems in society. In the practical translation process, translators should place linguistic signs in the social situation besides the infl uence of internal factors, thus facilitating a more comprehensive research. The paper integrates Sociosemiotics -- three meanings proposed by Morris Charles, namely, referential meaning, linguistic meaning and pragmatic meaning) into the chapter title translation firstly by taking the chapter titles of four Chinese classic novels as examples to explore the translation techniques of chapter titles, and comes to the conclusion: translation techniques such as literal translation, addition and substitution are favorable to transfer referential meaning; translation technique such as conversion is more appropriate to transfer linguistic meaning; as for pragmatic meaning, the technique of free translation is an ideal choice. Key words: Chapter title; Sociosemiotics; Referential meaning; Linguistic meaning; Pragmatic meaning; Translation techniques
Effects of tetramethylpyrazine on angiotensin Ⅱ-induced proliferation and type Ⅰ collagen synthesis of rat cardiac fibroblasts
Dong-mei ZHANG
Zhong Xi Yi Jie He Xue Bao , 2009,
Abstract: Objective: To observe the effects of tetramethylpyrazine (TMP) on the proliferation and type Ⅰ collagen synthesis of rat cardiac fibroblasts (CFBs) induced by angiotensin Ⅱ (Ang Ⅱ), and to explore the mechanism of TMP in treating myocardial fibrosis.Methods: CFBs were isolated from neonatal rats, and the fourth-passage CFBs were used in the entire test and were stimulated by 0.1 μmol/L Ang Ⅱ in vivo. The CFB proliferation was measured by methyl thiazolyl tetrazolium (MTT) assay. Type Ⅰ collagen in the cell culture supernatant was measured by enzyme-linked immunosorbent assay. The expression of mRNA of type Ⅰ collagen was semi-quantitatively measured by reverse transcription-polymerase chain reaction (RT-PCR).Results: (1) In MTT assay, the optical density of CFBs cultured with 0.1 μmol/L Ang Ⅱ was higher than that of the blank control cultured with 2% fetal bovine serum-Dulbecco’s modified Eagle’s medium (FBS-DMEM). The difference was statistically significant (P<0.05). Both optical densities of CFBs cultured with 0.1 μmol/L Ang Ⅱ plus 800 μg/mL TMP and 0.1 μmol/L Ang Ⅱ plus 600 μg/mL TMP were lower than that of CFBs cultured with 0.1 μmol/L Ang Ⅱ, but only the difference between 0.1 μmol/L AngⅡ plus 800 μg/mL TMP group and 0.1 μmol/L Ang Ⅱ group was significant (P<0.05). (2) The content of type Ⅰ collagen secreted by CFBs cultured with 0.1 μmol/L Ang Ⅱ was higher than that with 2% FBS-DMEM (P<0.01). The content of type Ⅰ collagen secreted by CFBs cultured with 0.1 μmol/L Ang Ⅱ plus 800 μg/mL TMP was lower than that with 0.1 μmol/L Ang Ⅱ (P<0.05). (3) The level of type Ⅰ collagen mRNA in 0.1 μmol/L Ang Ⅱ group was higher than that in blank control group, and lower than that in 0.1 μmol/L Ang Ⅱ plus 800 μg/mL TMP group. Both the differences between 0.1 μmol/L Ang Ⅱ group and the blank control group and between 0.1 μmol/L Ang Ⅱ group and 0.1 μmol/L Ang Ⅱ plus 800 μg/mL TMP group were statistically significant (P<0.05).Conclusion: TMP can not only inhibit the proliferation of CFBs, but also decrease the secretion and the mRNA expression level of collagen Ⅰ in cultured CFBs of rat which are increased by Ang Ⅱ.
Investigating connectional characteristics of Motor Cortex network  [PDF]
Dong-Mei Hao, Ming-Ai Li
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.21006
Abstract: To understand the connectivity of cerebral cor-tex, especially the spatial and temporal pattern of movement, functional magnetic resonance imaging (fMRI) during subjects performing finger key presses was used to extract functional networks and then investigated their character-istics. Motor cortex networks were constructed with activation areas obtained with statistical analysis as vertexes and correlation coefficients of fMRI time series as linking strength. The equivalent non-motor cortex networks were constructed with certain distance rules. The graphic and dynamical measures of motor cor-tex networks and non-motor cortex networks were calculated, which shows the motor cortex networks are more compact, having higher sta-tistical independence and integration than the non-motor cortex networks. It indicates the motor cortex networks are more appropriate for information diffusion.
Influencing Factors and Process on in Situ Degradation of Poly(Butylene Succinate) Film by Strain Bionectria ochroleuca BFM-X1 in Soil  [PDF]
Xueli Mei, Chengming Tian, Qian Dong, Yingmei Liang
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.36063
Abstract: This is the first report on the PBS film degraded by any Bionectria ochroleuca fungal strain. The fungal strain BFM-X1 was isolated from an air environment on a vegetable field and was capable of degrading poly(butylene succinate) (PBS). The taxonomic identity of the strain BFM-X1 was confirmed to be Bionectria ochroleuca (showing a 99% similarity to B. ochroleuca in a BLAST search) through an ITS rRNA analysis. The bio-degradation of the PBS film by strain BFM-X1 was studied. Approximately 97.9% of the PBS film was degraded after strain BFM-X1 was inoculated at 28?C for 14 days. The degradation efficiency of BFM-X1 against PBS film under different soil environmental conditions was characterized. The results indicated that 62.78% of the PBS film loss was recorded in a 30-d experimental run in a sterile soil environment indoors. On adding strain BFM-X1 to a soil sample, the PBS degradation rate accelerated approximately fivefold. Furthermore, both temperature and humidity influenced the in situ degradation of the PBS by strain BFM-X1, and temperature may be the major regulating factor. The degradation was particularly effective in the warm season, with 90% of weight loss occurring in July and August. Scanning electron microscope observations showed surface changes to the film during the degradation process, which suggested that strain BFM-X1preferentially degraded an amorphous part of the film from the surface. These results suggested that the strain B. ochroleuca BFM-X1 was a new resource for degrading PBS film and has high potential in the bioremediation of PBS-plastic-contaminated soil environment
Simulation Study of Three Types of Distributed Power Based on EMTDC  [PDF]
Peng-tao Mu, Dong-mei Zhao
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B008
Abstract: In order to analyze the performances of directly-driven permanent magnet synchronous generator wind turbine (PMSG) connecting to the grid, photovoltaic array and microtubine, dynamic models of them are established. The validity of the established models and proposed control strategies are demonstrated by simulation system under the software package PSCAD/EMTDC.
Risk Factor Empirical Research of PPP Projects Based on Factor Analysis Method  [PDF]
Hang Yin, Yuan-Fu Li, Dong-Mei Zhao
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.56038
Abstract: As an innovative investment and financing system of urbanization and the key to the local financing platform to resolve the debt risk, PPP projects have great significance to the current Chinese economy. At present, domestic PPP projects lack of benefit sharing standard and the mechanism of risk-sharing and risk factor analysis is the premise of risk-sharing. Adopting the raw data of major risk factors by questionnaire investigation from a key domestic PPP project, and using SPSS and factor analysis method to do an empirical test, a financing risk index system is built. The results of the study also reveal that financing risk factors are the most important ones to a particular PPP project.
Research on a Methodology to Model Speech Emotion
Y.U. Dong Mei,Y.U. Dong Mei
Journal of Engineering and Applied Sciences , 2012,
Abstract: Research was conducted to develop a methodology to model the emotional content of speech as a linear function of time and speech features. In this study, emotional type is coming from 6 base emotions (anger, disgust, fear, joy, sadness and surprise). But, in the application is not defined as a simple word, is quantified using the dimensions valence and arousal and the value of valance or arousal is expressed as some interval. Results demonstrate that the model is more excellence than others.
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