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Search Results: 1 - 10 of 79206 matches for " Lili Chen "
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Performance Analysis of Multiband Impulse Radio UWB Communication System Based on PSWF  [PDF]
Lili Chen, Zheng Dou
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2031
Abstract: To improve the data transmission rate and use spectrum flexibly, a new spectrum allocation method for Multiband Impulse Radio UWB (MB-IR-UWB) is proposed in this paper based on the band-limited and orthogonal characteristics of Prolate Spheroidal Wave Function (PSWF). The system model is built and the bit error rate (BER) formula is deprived by binary time hopping pulse position modulation under additive white Gaussian noise. Moreover, the system performance is analyzed via MATLB simulation. The results indicate that MB-IR-UWB system performance of BER is the same with single-band UWB. However, in the proposed scheme the data can be transmitted in multiple parallel bands, which enjoys much higher transmission rate. In addition, PSWF pulse duration affects the BER performance.
Rogue Wave for the Benjamin Ono Equation  [PDF]
Lili Song, Wei Chen, Zhenhui Xu, Hanlin Chen
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.52010
Abstract:

In the paper, the homoclinic (hateroclinic) breather limit method (HBLM) is applied to seek rogue wave solution of the Benjamin Ono equation. We find that the rational breather wave solution is just a rogue wave solution. This result shows that rogue wave can come from the extreme behavior of the breather solitary wave for (1+1)-dimensional nonlinear wave fields.

Comparison of Two Chinese Translations of the Gettysburg Address
Lili ZHAN,Haiqing CHEN
Studies in Literature and Language , 2012, DOI: 10.3968/j.sll.1923156320120403.3520
Abstract: Translation is seen as a process in which the translator is trying to re-contextualize the source text (ST) to make the translation adaptable to the target culture and target language norms. As one of far-reaching speeches, the Gettysburg Address has been translated into many languages, including Chinese. This paper makes an attempt to illustrate the procedure of translation through a comparison between two Chinese versions of the Gettysburg Address. The paper first makes a general description of the organization and language features of ST, and then a detailed analysis has been conducted alongside the comparison in order to unveil the process of translation. Through the comparative study, both strengths and weaknesses of two Chinese versions have been analyzed and revisions are made when necessary. Key words: Gettysburg address; Translation; Source text; Target text
The natural quiver of an artinian algebra
Fang Li,Lili Chen
Mathematics , 2014,
Abstract: The motivation of this paper is to study the natural quiver of an artinian algebra, a new kind of quivers, as a tool independing upon the associated basic algebra. In \cite{Li}, the notion of the natural quiver of an artinian algebra was introduced and then was used to generalize the Gabriel theorem for non-basic artinian algebras splitting over radicals and non-basic finite dimensional algebras with 2-nilpotent radicals via pseudo path algebras and generalized path algebras respectively. In this paper, firstly we consider the relationship between the natural quiver and the ordinary quiver of a finite dimensional algebra. Secondly, the generalized Gabriel theorem is obtained for radical-graded artinian algebras. Moreover, Gabriel-type algebras are introduced to outline those artinian algebras satisfying the generalized Gabriel theorem here and in \cite{Li}. For such algebras, the uniqueness of the related generalized path algebra and quiver holds up to isomorphism in the case when the ideal is admissible. For an artinian algebra, there are two basic algebras, the first is that associated to the algebra itself; the second is that associated to the correspondent generalized path algebra. In the final part, it is shown that for a Gabriel-type artinian algebra, the first basic algebra is a quotient of the second basic algebra. In the end, we give an example of a skew group algebra in which the relation between the natural quiver and the ordinary quiver is discussed.
Fractionation and structural identification of antibiotic activity substances from Streptomyces herbaricolor HNS2-2  [PDF]
Lili Chen, Youzhi Li, Hongjian Zhu, Yuhua Liu, Bida Gao
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34068
Abstract: Four groups of antibiotic activity compounds were separated and purified from the ethyl acetate fraction of a broth culture of Streptomyces herbaricolor HNS2-2.Trace analyses were performed and anti-microbial activities were determined. The antibiotic activity compounds were identified as quercetin dehydrate ①, p-hydroxyphenyl ②, 4’-hydroxyflavanone ③, and 3-hydroxyflavone ④ based on spectroscopic data. Compounds 1-4 showed significant antimicrobial activities against Staphylococcus aureus and the tobacco mosaic virus in vitro, suggesting their potential agricultural and medical applications.
LSSVM Combined with SPA Applied to Near-Infrared Quantitative Determination of the Octane in Fuel Petrol Samples  [PDF]
Lili Xu, Jie Gu, Huazhou Chen, Jiangbei Wen, Gaili Xu
Open Journal of Applied Sciences (OJAppS) , 2018, DOI: 10.4236/ojapps.2018.89032
Abstract: Least square support vector machine (LSSVM) combined with successive projection algorithm (SPA) method was applied for?near-infrared (NIR)quantitative determination of the octane number in fuel petrol. The NIR spectra of 87 fuel petrol samples were?scanned?for model establishment and optimization. First order derivative Savitzky-Golay smoother?(1st-d’SG) wasutilized to improve theNIR predictive ability. Its pretreatment effect was compared with the raw data.?SPA was?applied for the extraction of informative wavelengths. Considering the linear and non-linear?training mechanism,?LSSVM?regression was employed to establish calibration
The Discovery of Atmosphere Cooling Engine  [PDF]
Lili Xu, Jiqing Tan, Yanjun Mao, Bomin Chen, Huiyi Fan
Atmospheric and Climate Sciences (ACS) , 2019, DOI: 10.4236/acs.2019.93019
Abstract: The earth-atmosphere system is an energy equilibrium system, including cooling and heating systems. The conception of “atmospheric heat engine (AH Engine)” was put forward very early in the research of heating processes. However, in the field of research on atmosphere cooling, there is no corresponding academic conception. Here we show how the atmosphere cooling engine (AC Engine) is discovered. The results show that there is a huge cooling center between the subtropical zone of northern hemispheres and the subtropical zone of southern hemispheres in the stratosphere, which is the result of AH engine. In the lower latitudes of the upper troposphere, there is an atmospheric heating belt that reaches directly to the surface of the ocean. In the global ocean surface, there are five heating centers and one cooling center, which are the results of Ocean Stabilization Machine (OSM). Therefore, there are 23 short-term global climate warming trends and 23 short-term global climate cooling trends of Global Mean Lan/Oceans Temperature Anomalies Index, which are actually the result of fluctuations of AH engine, AC engine and OSM, and how the mechanism works by AH engine, AC engine and OSM is also explained.
Positive solutions for singular three-point boundary-value problems with sign changing nonlinearities depending on $x'$
Yun Chen,Baoqiang Yan,Lili Zhang
Electronic Journal of Differential Equations , 2007,
Abstract: Using a fixed point theorem in cones, this paper shows the existence of positive solutions for the singular three-point boundary-value problem $$displaylines{ x''(t)+a(t)f(t,x(t),x'(t))=0,quad 0 Keywords Three-point boundary value problem --- singularity --- positive solutions --- fixed point theorem.
Representations and $T$*-extensions of hom-Jordan-Lie algebras
Jun Zhao,Liangyun Chen,Lili Ma
Mathematics , 2014,
Abstract: The purpose of this paper is to study representations and $T$*-extensions of hom-Jordan-Lie algebras. In particular, adjoint representations, trivial representations, deformations and many properties of $T$*-extensions of hom-Jordan-Lie algebras are studied in detail. Derivations and central extensions of hom-Jordan-Lie algebras are also discussed as an application.
Rational Radial Distortion Models with Analytical Undistortion Formulae
Lili Ma,YangQuan Chen,Kevin L. Moore
Computer Science , 2003,
Abstract: The common approach to radial distortion is by the means of polynomial approximation, which introduces distortion-specific parameters into the camera model and requires estimation of these distortion parameters. The task of estimating radial distortion is to find a radial distortion model that allows easy undistortion as well as satisfactory accuracy. This paper presents a new class of rational radial distortion models with easy analytical undistortion formulae. Experimental results are presented to show that with this class of rational radial distortion models, satisfactory and comparable accuracy is achieved.
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