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Search Results: 1 - 10 of 125086 matches for " Ning Wang "
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A Comparison of the Ghost Cell Technique for Front Tracking Method  [PDF]
Donghong Wang, Yanqing Wang, Ning Zhao
Open Journal of Fluid Dynamics (OJFD) , 2013, DOI: 10.4236/ojfd.2013.33021
Abstract:

The treatment of moving material interfaces and their vicinity is very important for compressible multifluids. In this paper, we propose one type of ghost fluid method based on Riemann solutions for front tracking method. The accuracy of the interface boundary condition is discussed for the gas-gas Riemann problem. It is shown that the solution of the ghost fluid method approximates the exact solution to second-order accuracy in the sense of comparing to the exact solution of a Riemann problem at the material interface. Numerical examples suggest that the present scheme is able to handle multifluids problems with large density differences and has the property of reduced conservation error.

An Incremental-Selective Cooperative Relaying Scheme with Best Relay Selection in WSN80002  [PDF]
Shaoqing Wang, Hanlin Yang, Ning Zhou, An Wang
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.33018
Abstract:

In wireless sensor networks, the traditional multi-relay incremental cooperative relaying (MIR) scheme could improve the system throughput over the fading channel enormously by exploiting multiple relay nodes to retransmit the copy of the source packet to the destination in turn, but increase the energy consumption and transmission delay. In order to mitigating the energy consumption and transmission delay, this paper proposes a new cooperative relaying scheme termed as incremental-selective relaying with best-relay selection (ISR), which selects the best relay node from the candidate relays to retransmit the packet to the destination only when the direct transmission between the source and the destination is not successful. Expressions of normalized throughput, normalized delay and energy efficiency for the ISR and MIR systems are derived respectively and their performances are compared through simulations. The results show that normalized throughput, normalized delay and energy efficiency for the ISR system all outperform the corresponding performances of the MIR system. Especially, there are different the optimal number of relays which can maximize the energy efficiency of system.

{N,N′-Bis[1-(2-pyridyl)ethylidene]propane-1,2-diamine}bis(thiocyanato-κN)nickel(II)
Ning Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810029454
Abstract: In the title complex, [Ni(NCS)2(C17H20N4)], the Ni2+ ion (site symmetry 2) is coordinated by the N,N,N,N-tetradentate Schiff base ligand and two thiocyanate ligands, forming a distorted NiN6 octahedral geometry, with the thiocyanate N atoms in a trans orientation. The pendant methyl group of the central propane-1,2-diamine fragment of the ligand is statistically disordered over two sets of positions. In the crystal, weak aromatic π–π stacking between pyridine rings [centroid–centroid separation = 3.7081 (17) ] may help to establish the packing.
Bis[2-(1-iminoethyl)phenolato-κ2N,O]nickel(II)
Ning Wang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051476
Abstract: There are one and a half independent molecules in the asymmetric unit of the title compound, [Ni(C8H8NO)2], one of which is situated on an inversion center. In both molecules, the NiII ion is coordinated by two O and two N atoms from two Schiff base ligands in an approximate square-planar geometry. Intermolecular N—H...O hydrogen bonds link three molecules into centrosymmetric trimer. The crystal packing exhibits weak intermolecular C—H...O hydrogen bonds and voids of 37 3.
Formal Semantics of OWL-S with Rewrite Logic  [PDF]
Ning Huang, Xiaojuan Wang, Camilo Rocha
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.21004
Abstract: SOA is built upon and evolving from older concepts of distributed computing and modular programming, OWL-S plays a key role in describing behaviors of web services, which are the essential of the SOA software. Although OWL-S has given semantics to concepts by ontology technology, it gives no semantics to control-flow and data-flow. This paper presents a formal semantics framework for OWL-S sub-set, including its abstraction, syntax, static and dynamic seman-tics by rewrite logic. Details of a consistent transformation from OWL-S SOS of control-flow to corresponding rules and equations, and dataflow semantics including “Precondition”, “Result” and “Binding” etc. are explained. This paper provides a possibility for formal verification and reliability evaluation of software based on SOA.
An Application of Context Middleware Based on Fuzzy Logic for Wireless Sensor Networks  [PDF]
Ye NING, Ruchuan WANG, Shouming MA, Zhili WANG
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.15045
Abstract: The research of context-aware computing based on wireless sensor network (WSN) aims at intelligently connecting computers, users, and environment. So its application system should be flexibly adaptable to dynamic changes of context and application requirements and proactively provides the information satisfied with current context for users. The middleware can be very effective to provide the support runtime services for context-aware computing. In this paper we propose middleware architecture for context processing. This architecture is based on fuzzy logic control (FLC) system for context reasoning and sensor fusion. We propose a formal context representation model in which a user’s context is described by a set of roles and relations correspond to a context space. A middleware prototype has been developed, which detect tourist’ physical context and provide reminding. The experiments prove that the model and approach proposed are feasible.
Mean Convergence Rate of Derivatives by Lagrange Interpolation on Chebyshev Grids
Wang Xiulian,Ning Jingrui
Discrete Dynamics in Nature and Society , 2011, DOI: 10.1155/2011/503561
Abstract: We consider the rate of mean convergence of derivatives by Lagrange interpolation operators based on the Chebyshev nodes. Some estimates of error of the derivatives approximation in terms of the error of best approximation by polynomials are derived. Our results are sharp. 1. Introduction and Main Results Mean convergence of Lagrange interpolation based on the zeros of orthogonal polynomials (and possibly some additional points) has been studied for at least 70 years. There is a vast literature on this topic. The authors of [1–3] considered the simultaneous approximation by the Hermite interpolation operators, and we will consider the simultaneous approximation by Lagrange interpolation operators based on the zeros of Chebyshev polynomials. The relevant results can be found in [4–6]. We introduce these results below. Let be a so-called generalized Jacobi weight ( ), and let be the zeros of the th orthogonal polynomial associated with the weight-function . Let denote the Lagrange interpolating polynomial which interpolates at the zeros of . By using Markov-Bernstein type inequalities in metric, J. Szabados and A. K. Varma [5] reduced the weighted mean convergence of derivatives to the weighted mean convergence of and obtained the following. If means functional space equipped with norm and then, for , we have Here and in the following, the constant (may be different in the same expression) is independent of and but depends on , and denotes the error of the best polynomial approximation of degree of the corresponding function in the metric. Mastroianni and Nevai [4] get sharper estimates in terms of modulus of continuity instead of the best approximation. It improves some old results. But its proof also needs weighted Markov-Bernstein type inequality in metric and the idea of additional points. For the weight functions not satisfying (*), it is not possible to discuss by their method. To deal with these case, Du and Xu [7] consider the most important special case . Let be the zeros of , the th degree Chebyshev polynomial of the first kind. If , then the well-known Lagrange interpolation polynomial of based on is given by (see [8]) where Du and Xu [7] obtained the following. Theorem A. Let be as defined as above. Then, for , we have and the estimation for is sharp. We notice that although the sharp estimate is obtained, the upper bound is not for . Now we will give a Lagrange interpolation to improve their results. Let be the zeros of , the th degree Chebyshev polynomial of the second kind. If , then the well-known Lagrange interpolation polynomial of based
Involvement of Cytochrome P450 in Pentachlorophenol Transformation in a White Rot Fungus Phanerochaete chrysosporium
Daliang Ning, Hui Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045887
Abstract: The occurrence of cytochrome P450 and P450-mediated pentachlorophenol oxidation in a white rot fungus Phanerochaete chrysosporium was demonstrated in this study. The carbon monoxide difference spectra indicated induction of P450 (103±13 pmol P450 per mg protein in the microsomal fraction) by pentachlorophenol. The pentachlorophenol oxidation by the microsomal P450 was NADPH-dependent at a rate of 19.0±1.2 pmol min?1 (mg protein)?1, which led to formation of tetrachlorohydroquinone and was significantly inhibited by piperonyl butoxide (a P450 inhibitor). Tetrachlorohydroquinone was also found in the cultures, while the extracellular ligninases which were reported to be involved in tetrachlorohydroquinone formation were undetectable. The formation of tetrachlorohydroquinone was not detectable in the cultures added with either piperonyl butoxide or cycloheximide (an inhibitor of de novo protein synthesis). These results revealed the pentachlorophenol oxidation by induced P450 in the fungus, and it should be the first time that P450-mediated pentachlorophenol oxidation was demonstrated in a microorganism. Furthermore, the addition of the P450 inhibitor to the cultures led to obvious increase of pentachlorophenol, suggesting that the relationship between P450 and pentachlorophenol methylation is worthy of further research.
Comparison between phylogeny of introns and exons in primate
Ning Wang,Runsheng Chen
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02887113
Abstract: Introns and exons of 7 genes (epsilon globin, gamma-1 globin, gamma-2 globin, delta globin, beta globin, Immunoglobulin andprepro-insulin) in primates have been separated out and used to infer phylogeny respectively. For each gene, results based on these two parts have been compared and showed that: (i) the topology of introns is almost consistent with that of exons in each gene, while the branch length of them varies, because of the dierent mutation rate; (ii) there is evidence that the substitution rate of exons would decrease inhominoids, but that of introns would not; (iii) divergence time of orangutan deduced from different genes based on exons is various, while that based on introns is much similar, and consistent with fossil records; (iv) there is a relationship between the G + C content and the substitution rate. When the substitution rate of introns is higher than exons in a gene, the G + C content of introns is less. The above results suggest that introns could provide useful evolutionary information among closety related species.
A Growing Evolutionary Algorithm and Its Application for Data Mining
Ning Hou,Zhanmin Wang
International Journal of Intelligent Systems and Applications , 2011,
Abstract: an unsuitable representation will make the task of mining classification rules very hard for a traditional evolutionary algorithm (EA). But for a given dataset, it is difficult to decide which one is the best representation used in the mining progress. In this paper, we analyses the effects of different representations for a traditional EA and proposed a growing evolutionary algorithm which was robust for mining classification rules in different datasets. Experiments showed that the proposed algorithm is effective in dealing with problems of deception, linkage, epistasis and multimodality in the mining task.
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