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Search Results: 1 - 10 of 61382 matches for " Huimin Yu "
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Asymptotic Behavior of the 3D Compressible Euler Equations with Nonlinear Damping and Slip Boundary Condition
Huimin Yu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/584680
Abstract: The asymptotic behavior (as well as the global existence) of classical solutions to the 3D compressible Euler equations are considered. For polytropic perfect gas (()=0), time asymptotically, it has been proved by Pan and Zhao (2009) that linear damping and slip boundary effect make the density satisfying the porous medium equation and the momentum obeying the classical Darcy's law. In this paper, we use a more general method and extend this result to the 3D compressible Euler equations with nonlinear damping and a more general pressure term. Comparing with linear damping, nonlinear damping can be ignored under small initial data.
Bifurcation of Positive Solutions for a Class of Boundary Value Problems of Fractional Differential Inclusions
Yansheng Liu,Huimin Yu
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/942831
High frequency wheat regeneration from leaf tissue explants of regenerated plantlets  [PDF]
Huimin Yu, Wenchao Wang, Yanwen Wang, Bingkai Hou
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.31008
Abstract: The specificities of tissue culture of wheat greatly limit the use of chloroplast transformation technologies in this crop. One limitation in wheat tissue culture is that it is difficult to regenerate plantlets from leaf tissue explants of regenerated plantlets, resulting in difficulty in obtaining homoplastic plants via multiple rounds of antibiotic selection of chloroplast transformants. Thus, a repeated in vitro regeneration system from leaf tissues was studied in this research. Our results showed that 2 mm leaf basal segments of the 4 cm high leaves from regenerated plantlets can give the best callus induction at present study. The best callus induction medium was Murashige and Skoog (MS) basal medium supplemented with 2 mg/L 2,4-dichlorophenoxyacetic acid and 1 mg/L naphthalenacetic acid, which gave a callus induction rate of up to 87.2%. The optimal differentiation medium was MS basal medium supplemented with 10 mg/L silver nitrate and 1 mg/L 2,3,5-triiodobenzoic acid, which gave a regeneration rate up to 33.7% for the wheat lines tested. This is the first report showing that leaf basal segments of in vitro regenerated plantlets can be used for regeneration of wheat. The establishment of a repetitive regeneration system should pave the way for the development of chloroplast transformation and the plant regeneration systems starting from leaf material of in vitro regenerated wheat and other cereal crops.
Rapid and Sensitive Analysis of Eight Polyphenols in Tobacco by Rapid Resolution Liquid Chromatogarphy  [PDF]
Fuwei Xie, Ajuan Yu, Dengke Hou, Huimin Liu, Li Ding, Shusheng Zhang
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.28107
Abstract: A rapid resolution liquid chromatographic (RRLC) method for the determination of eight polyphenols in to-bacco was developed. Polyphenols were extracted from tobacco samples by methanol/ water in an ultrasonic bath, then subjected to clean up by solid phase extraction. The separation was performed on a 50 × 4.6 mm, 1.8 μm ZORBAX Eclipse XDB-C18 column. Compared with conventional HPLC method, the analysis time for eight polyphenols by RRLC method was reduced from 20 to 5 min without sacrificing resolution, and the sensitivity was improved. This method appears simple, accurate and precious. The relative standard devia-tions (RSD) of overall analysis procedure for eight tobacco polyphenols were less than 2% with the recover-ies ranging from 94% to 107%. This method could be applied to the rapid determination of major polyphe-nols in tobacco with satisfactory results.
Multiple positive solutions to third-order three-point singular semipositone boundary value problem
Huimin Yu,L Haiyan,Yansheng Liu
Mathematics , 2005,
Abstract: By using a specially constructed cone and the fixed point index theory, this paper investigates the existence of multiple positive solutions for the third-order three-point singular semipositone BVP: $\begin{cases} x'''(t)-\ld f(t,x) =0, &t\in(0,1); [.3pc] x(0)=x'(\eta)=x''(1)=0, & \end{cases}$ where ${1/2}<\eta<1$, the non-linear term $f(t,x):(0,1)\times(0,+\i)\to (-\i,+\i)$ is continuous and may be singular at $t=0$, $t=1$, and $x=0$, also may be negative for some values of $t$ and $x$, $\ld$ is a positive parameter.
Female Leaders’ Role Conflict and Its Balanced Solution  [PDF]
Huimin Zheng
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.68018
Abstract: With the transformation of society and the improvement of occupational diversification, women’s awareness and the ability of political participation are constantly strengthening. The proportion of female leading cadres in China is also growing year by year; however, as far as the development of female leading cadres is concerned, women are still far behind men in terms of quantity and behavioral influence. The long-term status inequality has inhibited women’s instinct and desire to tap their own potential and the sense of social participation. The career development and life balance of female leaders under multiple role conflicts has become the confusion of most female leaders. Therefore, mastering the balance of female leadership role conflicts is of great significance for improving women’s leadership and creating a happy life.
Preparation and characterization of aligned carbon nanotubes coated with titania nanoparticles
Hongtao Yu,Huimin Zhao,Xie Quan,Shuo Chen
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2109-x
Abstract: Well-aligned carbon nanotubes coated with titania (TiO2) were prepared by atmospheric pressure chemical vapor deposition (APCVD), and the sequential experiments including carbon nanotubes preparation, air-oxidation purification and titania nanoparticles coating were performed at different temperatures in the same reactor. Scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction pattems (XRD), and energy-dispersive X-ray spectra (EDX) demonstrated the well-aligned nanotubes and TiO2 nanoparticles in close proximity and the average diameter of TiO2 nanoparticles was 11.5 nm.
Gene knockout strategies for metabolic pathway regulation in industrial microbes

Huimin Yu,Yuchao Ma,

生物工程学报 , 2010,
Abstract: 基因敲除技术是一项重要的分子生物学技术,在工业微生物代谢工程中具有广泛应用。以下从基因敲除技术的遗传重组原理出发,总结了基因敲除策略的类型、特征和应用,重点介绍了采用线性双链DNA的λ Red同源重组系统、使用环状质粒载体介导的单交换或双交换同源重组策略以及采用转座酶介导的转座重组等几种主要的基因敲除方法,进一步展望了基因敲除技术的发展前沿和应用前景。
Association of XPC Polymorphisms and Lung Cancer Risk: A Meta-Analysis
Bo Jin, Yu Dong, Xueyan Zhang, Huimin Wang, Baohui Han
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093937
Abstract: Background Xeroderma pigmentosum complementation group C gene (XPC) is a key member of nucleotide excision repair pathway and plays an important role in human DNA repair system. It is reported that several common polymorphisms of XPC are associated with susceptibility to lung cancer. However, the conclusion is still elusive. Method This meta-analysis was performed to determine the relationship between XPC polymorphisms (Lys939Gln, Ala499Val, and PAT) and lung cancer risk. Published literatures were identified by searching online databases and reference lists of relevant studies. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated to estimate the association strength. Publication bias were detected by Egger’s and Begg’s test. Result After strict screening, we identified 14 eligible studies in this meta-analysis, including 5647 lung cancer cases and 6908 controls. By pooling all eligible studies, we found that the homozygote Gln939Gln genotype was associated with a significantly increased risk of lung cancer in Asian population (GlnGln vs LysLys, OR = 1.229, 95% CI: 1.000–1.510; GlnGln vs LysLys/LysGln, OR = 1.257, 95% CI: 1.038–1.522). As for the PAT polymorphism, in Caucasian population, we found carriers of the ?/? genotype were associated significantly reduced risk of lung cancer in homozygote comparison model (?/? vs +/+, OR = 0.735, 95% CI: 0.567–0.952). Conclusion In this meta-analysis we found that Gln939Gln genotype was associated with significantly increased risk of lung cancer in Asian population; the PAT ?/? genotype significantly reduced susceptibility to lung cancer in Caucasian population; while the XPC Ala499Val polymorphism was not associated with lung cancer risk.
Applying 3D Polygonal Mesh Watermarking for Transmission Security Protection through Sensor Networks
Roland Hu,Li Xie,Huimin Yu,Baocang Ding
Mathematical Problems in Engineering , 2014, DOI: 10.1155/2014/305960
Abstract: Although many research works have been carried out in the area of transmission 3D data through sensor networks, the security issue of transmission remains to be unsolved. It is important to develop systems for copyright protection and digital right management (DRM). In this paper, a blind watermarking algorithm is proposed to protect the transmission security of 3D polygonal meshes through sensor networks. Our method is based on selecting prominent feature vertices (prongs) on the mesh and then embedding the same watermark into their neighborhood regions. The embedding algorithm is based on modifying the distribution of vertex norms by using quadratic programming (QP). Decoding results are obtained by a majority voting scheme over neighborhood regions of these prongs. Assuming that cropping cannot remove all prongs, we can achieve robustness against the cropping attack both theoretically and experimentally. Experiments indicate that the proposed method is also robust against noise, smoothing, and mesh simplification. The proposed method has provided a solution for 3D polygonal watermarking which is potential to withstand a variety of attacks. 1. Introduction Nowadays, the processing, transmission, and visualization of 3D objects are a part of possible and realistic functionalities over sensor networks [1]. Confirmed 3D processing techniques exist and a large scientific community works hard on open problems and new challenges, including progressive transmission, fast access to huge 3D databases, or content security management. Although many research works have been carried out in the area of transmission 3D data through sensor networks, the security issue of transmission remains to be unsolved. 3D objects can be duplicated, modified, transformed, and shared easily during the transmission process. In this context, it is important to develop systems for copyright protection and digital right management (DRM). Watermarking is a promising area for reinforcing the security of 3D object transmission, which has received much attention in the past years, as summarized by [2, 3]. 3D objects can be represented by polygonal meshes [1], nonuniform rational B-splines (NURBS) [4], point-sampled surfaces, [5] and voxel representation [6]. Among these structures, polygonal mesh is the most popular one due to its simplicity and easiness to be converted to other representations. A 3D polygonal mesh is represented by a set of vertices and connections. In consequence, watermark can be embedded by modifying positions or connections of these vertices. Watermarking algorithms
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