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Search Results: 1 - 10 of 146433 matches for " Yao-Tang Li "
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Some variants of Newton's method with fifth-order and four-order convergence for solving nonlinear equations
Yao-tang Li,Ai-quan Jiao
International Journal of Applied Mathematics and Computation , 2009,
Abstract: Chun's two-step predictor-corrector type iterative method for solving nonlinear equations (Iterative Methods Improving Newton's Method by the Decomposition Method, J . Comput. Math. Appl.50, 1559-1568 ) is improved and a kind of new iterative method is presented. Some present methods derived from Adomian Decomposition method are unified in a form and a series of new methods with high convergence order and the value of EFF are obtained by introducing parameter also. Those methods can be considered as a significant improvement of the Newton's method and its variant forms.
Resource Elasticity of Offspring Survival and the Optimal Evolution of Sex Ratios
Rui-Wu Wang, Ya-Qiang Wang, Jun-Zhou He, Yao-Tang Li
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0053904
Abstract: The fitness of any organisms includes the survival and reproductive rate of adults and the survival of their offspring. Environmental selection pressures might not affect these two aspects of an organism equally. Assuming that an organism first allocates its limited resources to maintain its survival under environmental selection pressure, our model, based on the evolutionarily stable strategy theory, surprisingly shows that the sex ratio is greatly affected by the environmental pressure intensity and by the reproductive resource elasticity of offspring survival. Moreover, the concept of the resource elasticity of offspring survival intrinsically integrates the ecological concepts of K selection and r selection. The model shows that in a species with reproductive strategy K, increased environmental selection pressure will reduce resource allocation to the male function. By contrast, in a species with reproductive strategy r, harsher environmental selection pressure will increase allocation to the male function. The elasticity of offspring survival might vary not only across species, but also across many other factors affecting the same species (e.g., age structure, spatial heterogeneity), which explains sex ratio differences across species or age structures and spatial heterogeneity in the same species.
Infinity norm bounds for the inverse of Nekrasov matrices
Ljiljana Cvetkovic,Ping-Fan Dai,Ksenija Doroslovacki,Yao-Tang Li
Mathematics , 2011,
Abstract: From the application point of view, it is important to have a good upper bound for the maximum norm of the inverse of a given matrix A. In this paper we will give two simple and practical upper bounds for the maximum norm of the inverse of a Nekrasov matrix.
Relation between two non-pollinating wasps oviposition and the fruit abscission on Ficus racemosa
聚果榕两种非传粉小蜂产卵与果实脱落的关系

SUN Bao-Fa,WANG Rui-Wu,HU Zhong,LI Yao-Tang,
孙宝发
,王瑞武,胡忠,李耀堂

生态学报 , 2009,
Abstract: In the fig-fig wasp obligate mutualism, parasitic wasps Platyneura testacea and Platyneura mayri coexist with pollinating wasps. Theses non-pollinating wasps only use the seeds of figs or compete with pollinating wasp for floral resources, bring no any benefits to figs. The parasitism of these non-pollinating wasps may result in the disruption of the cooperation between figs and fig wasps. The fruit abscission mechanism of plant is generally considered as one of the key factors maintaining system stability. However, our quantitative experiment and field observations of fig-fig wasp system showed that the figs did not abscise fruits oviposited by Platyneura mayri, but abscised fruits over-ovipisited by P.testacea. The observation showed that tree oviposited by more P. testacea will have higher proportion of abscission. The over-ovipositing of P.testacea is the main reason for selective abscission of syconium. Our results indicate that the plant can only abscise fruits oviposited by parasitic wasps before pollinating wasps in fig-fig wasp mutualism, but do not abscise the fruits parasitized by wasps ovipositing simultaneous or later than pollinating wasps, implying that abscission can not sufficiently maintain the fig-fig wasp mutualism.
Effect of different deformation and annealing procedures on non-magnetic textured Cu60Ni40 alloy substrates
Jin Cui,Hong-li Suo,Jin-hua Wang,Jean-Claude Grivel,Lin Ma,Chun-yan Li,Yao-tang Ji,Shaheen Kausar,Min Liu,Yi Wang
- , 2018, DOI: https://doi.org/10.1007/s12613-018-1642-3
Abstract: In this work, a series of specimens was prepared by the casting method. Sharp cube-textured substrates were processed by heavy cold rolling and recrystallization annealing (i.e., the rolling-assisted biaxially textured substrates (RABiTS) method). Both the rolling and the recrystallization texture in the alloy tapes were investigated by X-ray diffraction and electron back-scatter diffraction, respectively. The results showed that a strong copper-type deformation texture was obtained in the heavy cold-rolled substrate. In addition, the recrystallization annealing process was found to be very important for the texture transition in the Cu–Ni alloy substrates. The cube texture content in the Cu60Ni40 alloy substrates reached 99.7% (≤10°) after optimization of the cold-rolling procedure and the recrystallizing heat-treatment process, whereas the content of low-angle grain boundaries (from 2° to 10° misorientation) in the substrate reached 95.1%.
Using a Fiber Loop and Fiber Bragg Grating as a Fiber Optic Sensor to Simultaneously Measure Temperature and Displacement
Yao-Tang Chang,Chih-Ta Yen,Yue-Shiun Wu,Hsu-Chih Cheng
Sensors , 2013, DOI: 10.3390/s130506542
Abstract: This study integrated a fiber loop manufactured by using commercial fiber (SMF-28, Corning) and a fiber Bragg grating (FBG) to form a fiber optic sensor that could simultaneously measure displacement and temperature. The fiber loop was placed in a thermoelectric cooling module with FBG affixed to the module, and, consequently, the center wavelength displacement of FBG was limited by only the effects of temperature change. Displacement and temperature were determined by measuring changes in the transmission of optical power and shifts in Bragg wavelength. This study provides a simple and economical method to measure displacement and temperature simultaneously.
Fatigue Strength and Modal Analysis of Bogie Frame for DMUs Exported to Tunisia  [PDF]
Wei Tang, Wenjing Wang, Yao Wang, Qiang Li
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.26041
Abstract:

The equivalent stress at key positions of Bogie Frame for DMUs Exported to Tunisia is obtained by using simulation analysis. The evaluation of static strength and fatigue strength is checked referring to UIC specification and Goodman sketch for welding materials. In addition, the modal analysis of the frame is made, and the vibrational modal of frame in given frequency domain is predetermined to evaluate the dynamical behavior of the frame in order to meet the dynamical design requirements. The results show that the key points of the calculated frame of the equivalent stress are less than allowable stress, and thus it could provide a theoretical foundation for the optimized design of frame structure and safety of industrial production.

Comparative Analysis of Protein Expression Concomitant with DNA Methyltransferase 3A Depletion in a Melanoma Cell Line  [PDF]
Xiaoyan Liu, Shengnan Tang, Tonghua Li, Haoyue Wang, Jiangming Sun, Qian Qiao, Jun Yao, Jian Fei
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.25064
Abstract: DNA methyltransferase 3A (Dnmt3a), a de novo methyltransferase, has attracted a great deal of attention for its important role played in tumorigenesis. We have previously demonstrated that melanoma is unable to grow in-vivo in conditions of Dnmt3a depletion in a mouse model. In this study, we cultured the Dnmt3a depletion B16 melanoma (Dnmt3a-D) cell line to conduct a comparative analysis of protein expression con-comitant with Dnmt3a depletion in a melanoma cell line. After two-dimensional separation, by gel electro-phoresis and liquid chromatography, combined with mass spectrometry analysis (1DE-LC-MS/MS), the re-sults demonstrated that 467 proteins were up-regulated and 535 proteins were down-regulated in the Dnmt3a-D cell line compared to the negative control (NC) cell line. The Genome Ontology (GO) and KEGG pathway were used to further analyze the altered proteins. KEGG pathway analysis indicated that the MAPK signaling pathway exhibited a greater alteration in proteins, an interesting finding due to the close relation-ship with tumorigenesis. The results strongly suggested that Dnmt3a potentially controls the process of tu-morigenesis through the regulation of the proteins (JNK1, p38α, ERK1, ERK2, and BRAF) involved in tu-mor-related pathways, such as the MAPK signaling pathway and melanoma pathway.
Distribution and Functions of TonB-Dependent Transporters in Marine Bacteria and Environments: Implications for Dissolved Organic Matter Utilization
Kai Tang, Nianzhi Jiao, Keshao Liu, Yao Zhang, Shuhui Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041204
Abstract: Background Bacteria play critical roles in marine nutrient cycles by incorporating and redistributing dissolved organic matter (DOM) and inorganic nutrients in the ocean. TonB-dependent transporter (TBDT) proteins allow Gram-negative bacteria to take up scarce resources from nutrient-limiting environments as well as siderophores, heme, vitamin B12, and recently identified carbohydrates. Thus, the characterization of TBDT distribution and functions is essential to better understand the contribution TBDT to DOM assimilation and its consequences on nutrient cycling in the environment. Methodology/Principal Findings This study presents the distribution of encoded known and putative TBDT proteins in the genomes of microorganisms and from the Global Ocean Survey data. Using a Lek clustering algorithm and substrate specificities, the TBDT sequences were mainly classified into the following three groups: (1) DOM transporters; (2) Siderophores/Vitamins transporters; and (3) Heme/Hemophores/Iron(heme)-binding protein transporters. Diverse TBDTs were found in the genomes of oligotroph Citromicrobium bathyomarinum JL354 and Citromicrobium sp JLT1363 and were highly expressed in the stationary phase of bacterial growth. The results show that the Gammaproteobacteria and the Cytophaga-Flavobacterium-Bacteroides (CFB) group bacteria accounted for the majority of the TBDT gene pool in marine surface waters. Conclusions/Significance The results of this study confirm the ecological importance of TBDTs in DOM assimilation for bacteria in marine environments owing to a wide range of substrate utilization potential in the ubiquitous Gammaproteobacteria and CFB group bacteria.
Establishment of trophic continuum in the food web of the Yellow Sea and East China Sea ecosystem: Insight from carbon and nitrogen stable isotopes
Deling Cai,Hongyan Li,Qisheng Tang,Yao Sun
Science China Life Sciences , 2005, DOI: 10.1360/04yc0136
Abstract: Stable carbon and nitrogen isotope ratios (δ13C and δ15N) are used to study the trophic structure of food web in the Yellow Sea and East China Sea ecosystem. The trophic continuum of pelagic food web from phytoplankton to top preyer was elementarily established, and a trophic structure diagram in the Yellow Sea and East China Sea was outlined in combination with carbon isotopic data of benthic organisms, which is basically consistent with and makes some improvements on the simplified Yellow Sea food web and the trophic structure diagram drawn based on the biomass of main resource population during 1985–1986. This result indicates that the stable isotope method is a potential useful means for further studying the complete marine food web trophic continuum from viruses to top predators and food web stability.
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