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Search Results: 1 - 10 of 78293 matches for " Yiwang Chen "
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An Improvement for the Locally One-Dimensional Finite-Difference Time-Domain Method
Xiuhai Jin,Pin Zhang,Yiwang Chen
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n5p118
Abstract: To reduce the memory usage of computing, the locally one-dimensional reduced finite-difference time-domain method is proposed. It is proven that the divergence relationship of electric-field and magnetic-field is non-zero even in charge-free regions, when the electric-field and magnetic-field are calculated with locally one-dimensional finite-difference time-domain (LOD-FDTD) method, and the concrete expression of the divergence relationship is derived. Based on the non-zero divergence relationship, the LOD-FDTD method is combined with the reduced finite-difference time-domain (R-FDTD) method. In the proposed method, the memory requirement of LOD-R-FDTD is reduced by1/6 (3D case) of the memory requirement of LOD-FDTD averagely. The formulation is presented and the accuracy and efficiency of the proposed method is verified by comparing the results with the conventional results.
Study on biodegradable aromatic/aliphatic copolyesters
Chen, Yiwang;Tan, Licheng;Chen, Lie;Yang, Yan;Wang, Xiaofeng;
Brazilian Journal of Chemical Engineering , 2008, DOI: 10.1590/S0104-66322008000200011
Abstract: progress on biodegradable aromatic/aliphatic copolyesters based on aliphatic and aromatic diacids, diols and ester monomers was reviewed. the aromatic/aliphatic copolyesters combined excellent mechanical properties with biodegradability. physical properties and biodegradability of copolyesters varied with chain length of the aliphatic polyester segment and atacticity of copolyesters. the processability of copolyesters could be improved significantly after incorporating a stiff chain segment through copolymerization of aliphatic polyesters with an aromatic liquid crystal element. the aromatic/aliphatic copolyesters as a new type of biodegradable materials could replace some general plastics in certain applications, namely biomedical and environmental friendly fields.
The Stability and Numerical Dispersion Study of the ADI-SFDTD Algorithm
Zongxin Liu,Yiwang Chen,Xin Xu,Xuegang Sun
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n6p157
Abstract: In this letter, the alternating-direction-implicit (ADI) technique is applied to Symplectic finite-difference time-domain (SFDTD) method, the curl operator is endued with two different styles when doing computation from the th progression to th progression. It holds the advantages of both ADI-FDTD and SFDTD, not only eliminating the restriction of the Courant-Friedrich-Levy (CFL), but also holding the inner characteristics of Maxwell’s equations. The analytical accuracy and efficiency of the proposed method is verified good.
Study on the Camouflaged Target Detection Method Based on 3D Convexity
Yuxin Pan,Yiwang Chen,Qiang Fu,Ping Zhang
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n4p152
Abstract: To effectively detect the camouflaged target in the complex background, the target detection method based on 3D convexity is proposed in this article. This method uses a new operator which can fully utilize the representative image gray level represented by the convexity structure of the target, set up appropriate threshold to eliminate the influence of the background noise by the median filtering through the gray face of the target image, and realize the effective detection and identification of the convexity target. The experiment result shows that this method could successively detect the camouflaged targets in the complex background, better than classic edge detection method. As a new camouflaged target detection and evaluation technology, this method can provide necessary factors for the design and implementation of the camouflage technology, and promote the development of the camouflage technology.
On the Inversion Polynomial for Dedekind Sums
Yiwang Chen,Nicholas Dunn,Campbell Hewett,Shashwat Silas
Mathematics , 2014, DOI: 10.1142/S1793042115501067
Abstract: We introduce the inversion polynomial for Dedekind sums $f_b(x)=\sum x^{\operatorname{inv}(a,b)}$ to study the number of $s(a,b)$ which have the same value for given $b$. We prove several properties of this polynomial and present some conjectures. We also introduce connections between Kloosterman sums and the inversion polynomial evaluated at particular roots of unity. Finally, we improve on previously known bounds for the second highest value of the Dedekind sum and provide a conjecture for a possible generalization. Lastly, we include a new restriction on equal Dedekind sums based on the reciprocity formula.
Cytohesins/ARNO: The Function in Colorectal Cancer Cells
Tao Pan, Junfeng Sun, Jiyi Hu, Yiwang Hu, Jun Zhou, Zhigang Chen, Dong Xu, Wenhong Xu, Shu Zheng, Suzhan Zhang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090997
Abstract: Epidermal growth factor (EGF) and insulin-like growth factor-I (IGF-I) are critical regulators of cell differentiation, survival, proliferation, and migration in cancers. This study found that ARNO (cytohesin-2), an activator of the EGF and IGF-I pathways, was more highly expressed in colorectal cancer tissue than in benign adjacent colorectal tissue. When ARNO-siRNA or the chemical inhibitor SecinH3 blocked ARNO, the downstream of the EGF and IGF-I pathways decreased in colorectal cell lines HT29 and HCT116. This blocking also weakened cell proliferation, invasion, and migration in vitro. Furthermore, EGF receptor (EGFR)-dependent colorectal tumor xenografts in nude mouse exerted anti-proliferative and growth suppression effects by injecting secineH3. These data suggested that inhibiting cytohesins or ARNO as cytoplasmic activators of EGFR and IGF-I in colorectal cancer resulted in anti-proliferation, reduced invasion, decreased migration, and suppressed growth in vivo and in vitro. Therefore, cytohesins or ARNO may be a potential therapy target for some colorectal cancer.
Design of a Novel Multi-Mode LED Dimming and Color Control System  [PDF]
Yiwang Wang, Liu Shen, Xiaoxiao Li, Bo Zhang, Zhenjing Lu
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.34022
Abstract: Aiming at the needs of different lighting applications, combined with the characteristics of LED dimming and color control, and using MSP430 digital control technology, a novel LED intelligent dimming and color control system was designed. The system integrated Bluetooth remote, human infrared sensor, voice/gesture control and other control modes, which could achieve LED multi-mode dimming and color intelligent control. System hardware and software were designed to develop a prototype to experimental verification. The designed method proposes new ideas and information for LED control.
Biaxiality Dependence of the Fracture Toughness for Glass in Plane Stress State
Yiwang BAOR W Steinbrech,

材料科学技术学报 , 1998,
Abstract: The fracture behaviour of glass in biaxial stress state has been investigated. Fracture toughness of disk specimen with a straight-through crack was measured under biaxial tension and uniaxial tension loads respectively. The difference between them and the reasons for the difference are discussed. The influence of the stress parallel to crack on fracture of brittle material was demonstrated in theory and experiments. The results show that plane stress fracture toughness of glass is not a material constant. and that the fracture toughness measured in biaxial tension state is higher than that measured under uniaxial tension. The conventional fracture criterion upon the stress intensity factor is questioned in the case of biaxial stress problem, and the strain dependence of crack growth is discussed.
Damage from Particle Impact for Structural Ceramics
Zhongzhe JIN,Yiwang BAO,

材料科学技术学报 , 1994,
Abstract: In this study, the relationship between the maximum impact force and velocity of partjcle has been derived on the basis of elastic theory and energy principle. Critical impact force and critical speed which cause initial damage is anaIVsed and its analytical expression is presented. The impact force for six dlfferent materials was measu red at the same condition to investigate the v8riation of impact pararneter with material properties. The authors provide a simple test method and experimental de vice to imitate the impact of moving particle, A series of experiments on ceramics and gIass were car ried out to study the dependence of residual strength on the impulse.
Whole-Genome Synthesis and Characterization of Viable S13-Like Bacteriophages
Yuchen Liu, Yonghua Han, Weiren Huang, Yonggang Duan, Lisha Mou, Zhimao Jiang, Pingping Fa, Jun Xie, Ruiying Diao, Yuanbin Chen, Yiwang Ye, Ruilin Yang, Jing Chen, Xiaojuan Sun, Zesong Li, Aifa Tang, Yaoting Gui, Zhiming Cai
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041124
Abstract: Background Unprecedented progresses in high-throughput DNA sequencing and de novo gene synthesis technologies have allowed us to create living organisms in the absence of natural template. Methodology/Principal Findings The sequence of wild-type S13 phage genome was downloaded from GenBank. Two synonymous mutations were introduced into wt-S13 genome to generate m1-S13 genome. Another mutant, m2-S13 genome, was obtained by engineering two nonsynonymous mutations in the capsid protein coding region of wt-S13 genome. A chimeric phage genome was designed by replacing the F capsid protein open reading frame (ORF) from phage S13 with the F capsid protein ORF from phage G4. The whole genomes of all four phages were assembled from a series of chemically synthesized short overlapping oligonucleotides. The linear synthesized genomes were circularized and electroporated into E.coli C, the standard laboratory host of S13 phage. All four phages were recovered and plaques were visualized. The results of sequencing showed the accuracy of these synthetic genomes. The synthetic phages were capable of lysing their bacterial host and tolerating general environmental conditions. While no phenotypic differences among the variant strains were observed when grown in LB medium with CaCl2, the S13/G4 chimera was found to be much more sensitive to the absence of calcium and to have a lower adsorption rate under calcium free condition. Conclusions/Significance The bacteriophage S13 and its variants can be chemically synthesized. The major capsid gene of phage G4 is functional in the phage S13 life cycle. These results support an evolutional hypothesis which has been proposed that a homologous recombination event involving gene F of quite divergent ancestral lineages should be included in the history of the microvirid family.
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