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Search Results: 1 - 10 of 36889 matches for " Zhao Wenmin "
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CVD Treatment of Carbon Fibers and Evaluation of Their Dispersion in CFRC  [PDF]
Chuang Wang, Bingliang Li, Lei Peng, Wenmin He, Liping Zhao, Kezhi Li
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.88046
Abstract: Carbon-fiber-reinforced cement-based (CFRC) composites is a promising functional material which can be used both in the military and civil fields against electromagnetic interference. However, it is essential to make carbon fibers dispersed uniformly during the preparation of CFRC. In this work, short carbon fibers were treated through Chemical Vapor Deposition (CVD) process at high temperature between 900°C and 1200°C under the protection of diluted nitrogen gas N2 to modify the surface of carbon fibers to further strengthen the bonding between carbon fibers and cement matrix. Natural gas (98% CH4) was used as a precursor. It was decomposed to produce an uneven layer of pyrocarbon that was deposited on the surface of carbon fibers. CVD-treated carbon fibers were pre-dispersed by using ultrasonic wave. Both hydroxyethyl cellulose (HEC) and silicon fume were used as dispersants and as admixtures. They helped CVD-treated carbon fibers distribute uniformly. The mass fraction of HEC was around 1.78% in the aqueous solution. Four methods, namely, the simulation experiment (SE) method, the scanning electron microscopy (SEM) method, the fresh mixture (FM) method, and the electrical resistivity measurement (ERM) method were, respectively, applied to evaluate fiber dispersion degree. Each method indicated its own advantages and disadvantages and it therefore catered for different conditions. Of the four evaluation methods, the SE method was the most convenient way to determine the pre-dispersion state prior to the preparation of CFRC composites. This method was helpful for predicting the subsequent dispersion state of carbon fibers in the cement matrix because it economized a large quantity of raw materials and time.
(E)-2-[2-(4-Chlorobenzylidene)hydrazinyl]-4-[3-(morpholin-4-ium-4-yl)propylamino]quinazolin-1-ium bis(perchlorate)
Nan Jiang,Jian Zuo,Wenmin Zhu,Xinjie Zhao
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812021678
Abstract: In the title compound, C22H27ClN6O22+·2ClO4 , the molecule adopts an E conformation about the C=N double bond. The quinazoline ring is approximately planar, with an r.m.s. deviation of 0.0432 , and forms a dihedral angle of 5.77 (4)° with the chlorophenyl ring. The crystal packing features N—H...O hydrogen bonds.
Predictive value of pre-procedural autoantibodies against M2-muscarinic acetylcholine receptor for recurrence of atrial fibrillation one year after radiofrequency catheter ablation
Zou Changhong,Zhang Zhiyong,Zhao Wenmin,Li Guang
Journal of Translational Medicine , 2013, DOI: 10.1186/1479-5876-11-7
Abstract: Background Increasing evidences have suggested that autoantibodies against muscarinic-2 acetylcholine receptor (anti-M2-R) may play an important role in the development of atrial fibrillation (AF). Predictive value of pre-procedural anti-M2-R for the recurrence of AF after radiofrequency catheter ablation is still unclear. Methods Totally 76 AF patients with preserved left ventricular systolic function were prospectively enrolled and subjected to ablation after the detection of serum anti-M2-R by enzyme linked immunosorbent assay. These patients were given follow-up examination for one year after ablation. Risk estimation for the recurrence of AF was performed using the univariate and multivariate logistic regression. Results In AF group, serum anti-M2-R was significantly higher than that in the control group in terms of frequency (40.8% versus 11.7%; p < 0.001) and titer (1:116 versus 1:29; p < 0.001). Compared with paroxysmal AF patients, persistent AF patients had higher frequency (57.6% versus 27.9%; p = 0.009) and titer (1:132 versus 1:94; p = 0.012) for autoantibodies. During one-year follow-up examination after ablation, the recurrence of AF was observed in 25 (32.9%) patients. Multivariate analysis showed that pre-procedural serum anti-M2-R was an independent predictor for the recurrence of AF at the time point of 12 months after ablation (odds ratio: 4.701; 95% confidence interval: 1.590-13.894; p = 0.005). Conclusions In AF patients, the frequency and titer of serum anti-M2-R were significantly higher than those in the control group with sinus rhythm. Pre-procedural serum anti-M2-R was an independent predictor for the recurrence of AF one year after radiofrequency catheter ablation.
Analysis on Bilingual Public Signs in the View of Audience Theory—A Case Study of City Traffic Public Signs in Xi’an  [PDF]
Wenmin Li, Xue Wang, Shihan Hou
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.52014
Abstract: This paper, with the audience theory as its theoretical guide and by taking a case study on Bilingual traffic Public Signs in Xi’an, especially on bilingual station names of Xi’an Metro Line 2, first briefly discusses how an important role city traffic public signs play in serving the audience, facilitating tourism as well as disseminating Chinese culture through the international audience. Second, it analyzes the problems existing in the present bilingual public signs in China and the counter-productive effects they are likely to bring about. And finally proposal for a new system of bilingual station names of Xi’an Metro Line 2 is put forward, which, the author believes, will not only offer the exact information wanted but make the audience abroad feel at home.
E-C Translation of Medicine-Health Texts: Optimal Relevance  [PDF]
Wenmin Li, Jie Qian, Kangting Zhang
Open Journal of Modern Linguistics (OJML) , 2018, DOI: 10.4236/ojml.2018.86023
Abstract: Translation activities, in the context of globalization, promote communication between people from different countries with different languages, and enhance the fusion of the two cultures behind these two languages concerned. This paper, focusing on the ostensive-inferential communication in translation process of the medicine-health text named Your Medical Mind: How to Decide What Is Right for You, aims at achieving successful communication between the authors of this paper and their target readers. By concrete analysis of the target text from the lexical level, syntactic level and cultural level, this study finds that it is the translators who take the most active and key role to bridge the two languages and cultures for communication, and only under the target readers’ good comprehension of the meaning conveyed by the source text can the translators succeed in transmitting the informative intention and communicative intention through ostensive stimulus to their target readers.
Forced response of atmospheric oscillations during the last millennium simulated by a climate system model
WenMin Man,TianJun Zhou
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4637-2
Abstract: Variations in global atmospheric oscillations during the last millennium are simulated using the climate system model FGOALS_gl. The model was driven by reconstructions of both natural forcing (solar variability and volcanic aerosol) and anthropogenic forcing (greenhouse gases and sulfate aerosol). The model results are compared against proxy reconstruction data. The reconstructed North Atlantic Oscillation (NAO) was out of phase with the Pacific Decadal Oscillation (PDO) in the last millennium. During the Medieval Warm Period (MWP), the NAO was strong while the PDO was weak. During the Little Ice Age (LIA), the NAO was weak while the PDO was strong. A La Ni a-like state prevailed in the MWP, while an El Ni o-like state dominated in the LIA. This phenomenon is particularly obvious in the 15th, 17th and 19th centuries. Analysis of the model output indicates that the NAO was generally positive during 1000–1400 AD and negative during 1650–1900 AD. There is a discrepancy between the simulation and reconstruction during 1400–1650 AD. The simulated PDO generally varies in parallel with the reconstruction, which has a negative phase during the MWP and a positive phase during the LIA. The correlation coefficient between the reconstruction and simulation is 0.61, and the correlation is statistically significant at the 1% level. Neither the La Ni a-like state of the MWP nor the El Ni o-like state of the LIA is reproduced in the model. Both the reconstructed and the simulated Antarctic Oscillations had a negative phase in the early period of the last millennium and a positive phase in the late period of the last millennium. The Asian-Pacific Oscillation was generally strong during the WMP and weak during the LIA, and the correlation coefficient between the simulation and reconstruction is 0.50 for the period 1000–1985 AD. The analysis suggests that the specified external forcings significantly affected the evolution of atmospheric oscillation during the last millennium.
Existence results for coupled Dirac systems via Rabinowitz-Floer theory
Wenmin Gong,Guangcun Lu
Mathematics , 2015,
Abstract: In this paper, we construct the Rabinowitz-Floer homology for the coupled Dirac system \begin{equation*} \left\{ \begin{aligned} Du=\frac{\partial H}{\partial v}(x,u,v)\hspace{4mm} {\rm on} \hspace{2mm}M,\\ Dv=\frac{\partial H}{\partial u}(x,u,v)\hspace{4mm} {\rm on} \hspace{2mm}M, \end{aligned} \right. \end{equation*} where $M$ is an $n$-dimensional compact Riemannian spin manifold, $D$ is the Dirac operator on $M$, and $H:\Sigma M\oplus \Sigma M\to \mathbb{R}$ is a real valued superquadratic function of class $C^1$ with subcritical growth rates. Solutions of this system can be obtained from the critical points of a Rabinowitz-Floer functional on a product space of suitable fractional Sobolev spaces. In particular, we consider the $S^1$-equivariant $H$ that includes a nonlinearity of the form $$H(x,u,v)=f(x)\frac{|u|^{p+1}}{p+1}+g(x)\frac{|v|^{q+1}}{q+1}, \text{ where }\frac{1}{p+1}+\frac{1}{q+1}>\frac{n-1}{n}$$ with $p,q>1$ and $f(x)$, $g(x)$ are strictly positive continuous functions on $M$. We establish the existence of a nontrivial solution by computing the Rabinowitz-Floer homology in the Morse-Bott situation.
Determination of Partition Coefficient of Dissolved Gases in Transformer Oil Using Phase Ratio Variation Method and Static Headspace Gas Chromatography
改变相比/顶空气相色谱法测定变压器油中溶解气体的分配常数

ZHAO Jinghong,WANG Hailong,LIU Wenmin,ZHOU Yansheng,GUAN Yafeng,
赵景红
,王海龙,刘文民,周延生,关亚风

色谱 , 2004,
Abstract: The partition coefficients of dissolved gases in transformer oil were determined using a phase ratio variation method and static headspace gas chromatography (GC). A pressure balancing and gas volume-metering device was connected to the vent of a sample loop on a six-port injection valve of the GC. The gas phase sample from the headspace vial of 25 mL was transferred to an 80 microL sample-loop through a fused silica capillary of 0.53 mm i.d., and then separated and determined quantitatively by GC. A 2 m x 1 mm i.d. GDX502 micro-packed column was used for the separation. Five different gas-liquid volume ratios in the headspace vials were measured at different equilibrium concentrations. The partition coefficients of hydrocarbon gases including methane, acetylene, ethylene, ethane and propane dissolved in transformer oil were determined by using linear regression analysis at 20 degrees C and 50 degrees C separately. The errors between the real values and regression values from experimental data were less than 4.14% except methane. Fundamental data for on-line measurement of dissolved gases in transformer oil are provided by GC.
Analysis of Group Components in Oils and Aromatics in Fuel Oils
油品族组成的详细分析和燃油中芳烃的分析

GUAN Yafeng,ZHAO Jinghong,LIU Wenmin,WANG Hanwen,
关亚风
,赵景红,刘文民,王涵文

色谱 , 2004,
Abstract: On-line coupling of capillary liquid chromatography-capillary gas chromatography (CGC) technique for detailed group component analysis of aviation kerosene, diesel fuels, lubricating oils, extraction oils, and residuum, is described. Aromatics in fuel oils were separated according to their ring number and structures. Different eluents were stored in loops on interface, and introduced sequentially onto the CGC for detailed separation and quantitative analysis. Capillary column switching-back flushing with a single detector was developed for the analysis of aromatics in gasoline and aviation kerosene. The early eluting components from a pre-column and the components of interest (aromatics plus heavier compounds) eluting from an analytical column were all directed to the same flame ionization detector, which performed quantitative analysis of aromatic hydrocarbons in oils by correction factor normalization method. Real oil samples were analyzed and the results showed that the reproducibility, accuracy and reliability of the method can fulfill the requirements of practical application.
Comparison of the Efficiency of Banna Miniature Inbred Pig Somatic Cell Nuclear Transfer among Different Donor Cells
Hongjiang Wei, Yubo Qing, Weirong Pan, Hongye Zhao, Honghui Li, Wenmin Cheng, Lu Zhao, Chengsheng Xu, Hong Li, Si Li, Lei Ye, Taiyun Wei, Xiaobing Li, Guowen Fu, Wengui Li, Jige Xin, Yangzhi Zeng
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0057728
Abstract: Somatic cell nuclear transfer (SCNT) is an important method of breeding quality varieties, expanding groups, and preserving endangered species. However, the viability of SCNT embryos is poor, and the cloned rate of animal production is low in pig. This study aims to investigate the gene function and establish a disease model of Banna miniature inbred pig. SCNT with donor cells derived from fetal, newborn, and adult fibroblasts was performed, and the cloning efficiencies among the donor cells were compared. The results showed that the cleavage and blastocyst formation rates did not significantly differ between the reconstructed embryos derived from the fetal (74.3% and 27.4%) and newborn (76.4% and 21.8%) fibroblasts of the Banna miniature inbred pig (P>0.05). However, both fetal and newborn fibroblast groups showed significantly higher rates than the adult fibroblast group (61.9% and 13.0%; P<0.05). The pregnancy rates of the recipients in the fetal and newborn fibroblast groups (60% and 80%, respectively) were higher than those in the adult fibroblast group. Eight, three, and one cloned piglet were obtained from reconstructed embryos of the fetal, newborn, and adult fibroblasts, respectively. Microsatellite analyses results indicated that the genotypes of all cloning piglets were identical to their donor cells and that the genetic homozygosity of the Banna miniature inbred pig was higher than those of the recipients. Therefore, the offspring was successfully cloned using the fetal, newborn, and adult fibroblasts of Banna miniature inbred pig as donor cells.
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