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Search Results: 1 - 10 of 23259 matches for " Renhui He "
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Study on the Influential Factors of Employment for the Economic Management College Students in Agricultural University under Financial Crisis Background
Hong Pan,Renhui He
Journal of Agricultural Science , 2011, DOI: 10.5539/jas.v3n1p271
Abstract: At present, there are some typical problems in economic management college agricultural university undergraduates' profession decision-making, such as taking up an occupation passively, not feeling satisfied with current work and so on. Aiming at these phenomena and based on the background of the financial crisis, in the paper, the author analyzed the cause from the angle of the graduates and carried through the SWOT analysis of employment competition. The results indicate that agricultural universities should strengthen the development of person with ability that could accord with the demand of social economic, strengthen education linked to the theory and practice of education, strengthen its employment training capacity and improving the competitiveness of employment.
Global well-posedness to the subcritical Oldroyd-B type models in 2D
Renhui Wan
Mathematics , 2015,
Abstract: We prove the global well-posedness to the 2D Oldroyd-B type models with $\nu \Lambda^{2\alpha}u$ and $\eta\Lambda^{2\beta}\tau$ satisfying $(i)\ \alpha>1, \eta=0$ or $(ii)\ \alpha=1,\ \beta>0$. By establishing the gradient estimate of $u$, $\tau$ and $L^\infty$ bound of ${\rm curl u+\Lambda^{-2}curldiv \tau}$, Elgidi-Rousset (Commun. Pure Appl. Math. online, 2015) obtained the global well-posedness for the case $\nu=0$, $\beta=1$. However, for the cases $(i)$ and $(ii)$, it is difficult to improve the regularity of $u$ and $\tau$ directly, especially when $\alpha\rightarrow 1^{+}$ in case $(i)$ and $\beta\rightarrow 0^{+}$ in case $(ii)$. To overcome this difficulty, we exploit a new structure of the equations coming from the dissipation and coupled term. Then we prove the global well-posedness to these cases by energy method which brings us closer to the more interesting case $\alpha=1$, $\eta=0$.
Global well-posedness to the 3D incompressible MHD equations with a new class of large initial data
Renhui Wan
Mathematics , 2015,
Abstract: We obtain the global well-posedness to the 3D incompressible magnetohydrodynamics (MHD) equations in Besov space with negative index of regularity. Particularly, we can get the global solutions for a new class of large initial data. As a byproduct, this result improves the corresponding result in \cite{HHW}. In addition, we also get the global result for this system in $\mathcal{\chi}^{-1}(\R^3)$ originally developed in \cite{LL}. More precisely, we only assume that the norm of initial data is exactly smaller than the sum of viscosity and diffusivity parameters.
On the uniqueness for the 2D MHD equations without magnetic diffusion
Renhui Wan
Mathematics , 2015,
Abstract: In this paper, we obtain the uniqueness of the 2D MHD equations, which fills the gap of recent work \cite{1} by Chemin et al.
Global small solutions to a tropical climate model without thermal diffusion
Renhui Wan
Mathematics , 2015,
Abstract: We obtain the global well-posedness of classical solutions to a tropical climate model derived by Feireisl-Majda-Pauluis in \cite{FMP} with only the dissipation of the first baroclinic model of the velocity ($-\eta \Delta v$) under small initial data. The main difficulty is the absence of thermal diffusion as the work by Li-Titi in \cite{LT}. To overcome it, we exploit the structure of the equations coming from the coupled terms, dissipation term and damp term. Then we find the hidden thermal diffusion. In addition, based on the Littlewood-Palay theory, we establish a generalized commutator estimate, which may be applied to other partial differential equations.
Risk Evaluation of International ConstructionProject Based on Triangular Fuzzy Matrix
Renhui Liu,Shuangliang Tai
International Journal of Business and Management , 2009,
Abstract: There are a lot of risk factors for international construction projects. These risks factor are made an analysis on the characteristic of project, thus the international project risk evaluation system has been built based on the six risks that include market risks, financial risks, construction risk, force majeure risks, completion risk and law risk. The international construction of the project risk evaluation system has been established, and complementary judgment matrix is designed based on triangular fuzzy number. Furthermore triangular fuzzy matrix has been made a solution by expansion principle from the multi-attribute-based., priorities of complementary judgment matrices are provided. The result realize for identifying the pivotal risk factor of international construction project risk.
Cyanobacteria toxins in the Salton Sea
Wayne W Carmichael, RenHui Li
Aquatic Biosystems , 2006, DOI: 10.1186/1746-1448-2-5
Abstract: From November 1999 to April 2001, 247 water and sediment samples were received for phytoplankton identification and cyanotoxin analyses. Immunoassay (ELISA) screening of these samples found that eighty five percent of all water samples contained low but detectable levels of the potent cyclic peptide liver toxin called microcystins. Isolation and identification of cyanobacteria isolates showed that the picoplanktonic Synechococcus and the benthic filamentous Oscillatoria were dominant. Both organisms were found to produce microcystins dominated by microcystin-LR and YR. A laboratory strain of Synechococcus was identified by PCR as being closest to known marine forms of this genus. Analyses of affected grebe livers found microcystins at levels that may account for some of the acute mortalities.The production of microcystins by a marine Synechococcus indicates that microcystins may be a more common occurrence in marine environments – a finding not recognized before this work. Further research should be done to define the distribution of microcystin producing marine cyanobacteria and to determine exposure/response effects of microcystins and possibly other cyanotoxins in the Salton Sea. Future efforts to reduce avian mortalities and remediate the Salton Sea should evaluate vectors by which microcystins enter avian species and ways to control and mitigate toxic cyanobacteria waterblooms at the Salton Sea.Beginning in the 1990's, massive avian and fish epornitics have occurred in the Salton Sea and over 200,000 eared grebes have died [1]. The largest single epizootic occurred in 1992 when an estimated 155,000 birds, primarily eared grebes (Podiceps nigricollis), died from an undiagnosed cause. The cause of these massive grebe epornitics remains unknown, although several diseases such as avian botulism and avian cholera have been diagnosed [2]. Algal biotoxins, especially those produced by dinoflagellates, have also been listed as a possible contributing cause [3], but non
Local well-posedness for the Hall-MHD equations with fractional magnetic diffusion
Dongho Chae,Renhui Wan,Jiahong Wu
Mathematics , 2014, DOI: 10.1007/s00021-015-0222-9
Abstract: The Hall-magnetohydrodynamics (Hall-MHD) equations, rigorously derived from kinetic models, are useful in describing many physical phenomena in geophysics and astrophysics. This paper studies the local well-posedness of classical solutions to the Hall-MHD equations with the magnetic diffusion given by a fractional Laplacian operator, $(-\Delta)^\alpha$. Due to the presence of the Hall term in the Hall-MHD equations, standard energy estimates appear to indicate that we need $\alpha\ge 1$ in order to obtain the local well-posedness. This paper breaks the barrier and shows that the fractional Hall-MHD equations are locally well-posed for any $\alpha>\frac12$. The approach here fully exploits the smoothing effects of the dissipation and establishes the local bounds for the Sobolev norms through the Besov space techniques. The method presented here may be applicable to similar situations involving other partial differential equations.
Genes Associated with 2-Methylisoborneol Biosynthesis in Cyanobacteria: Isolation, Characterization, and Expression in Response to Light
Zhongjie Wang,Yao Xu,Jihai Shao,Jie Wang,Renhui Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018665
Abstract: The volatile microbial metabolite 2-methylisoborneol (2-MIB) is a root cause of taste and odor issues in freshwater. Although current evidence suggests that 2-MIB is not toxic, this compound degrades water quality and presents problems for water treatment. To address these issues, cyanobacteria and actinomycetes, the major producers of 2-MIB, have been investigated extensively. In this study, two 2-MIB producing strains, coded as Pseudanabaena sp. and Planktothricoids raciborskii, were used in order to elucidate the genetic background, light regulation, and biochemical mechanisms of 2-MIB biosynthesis in cyanobacteria. Genome walking and PCR methods revealed that two adjacent genes, SAM-dependent methyltransferanse gene and monoterpene cyclase gene, are responsible for GPP methylation and subsequent cyclization to 2-MIB in cyanobacteria. These two genes are located in between two homologous cyclic nucleotide-binding protein genes that may be members of the Crp-Fnr regulator family. Together, this sequence of genes forms a putative operon. The synthesis of 2-MIB is similar in cyanobacteria and actinomycetes. Comparison of the gene arrangement and functional sites between cyanobacteria and other organisms revealed that gene recombination and gene transfer probably occurred during the evolution of 2-MIB-associated genes. All the microorganisms examined have a common origin of 2-MIB biosynthesis capacity, but cyanobacteria represent a unique evolutionary lineage. Gene expression analysis suggested that light is a crucial, but not the only, active regulatory factor for the transcription of 2-MIB synthesis genes. This light-regulated process is immediate and transient. This study is the first to identify the genetic background and evolution of 2-MIB biosynthesis in cyanobacteria, thus enhancing current knowledge on 2-MIB contamination of freshwater.
Theory of proton coupled electron transfer reactions: Assessing the Born-Oppenheimer approximation for the proton motion using an analytically solvable model
Renhui Zheng,Yuanyuan Jing,Liping Chen,Qiang Shi
Physics , 2010, DOI: 10.1016/j.chemphys.2010.11.001
Abstract: By employing an analytically solvable model including the Duschinsky rotation effect, we investigated the applicability of the commonly used Born-Oppenheimer (BO) approximation for separating the proton and proton donor-acceptor motions in theories of proton coupled electron transfer (PCET) reactions. Comparison with theories based on the BO approximation shows that, the BO approximation for the proton coordinate is generally valid while some further approximations may become inaccurate in certain range of parameters. We have also investigated the effect of vibrationally coherent tunneling in the case of small reorganization energy, and shown that it plays an important role on the rate constant and kinetic isotope effect.
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