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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Effect of Carbon Coating on the Electrochemical Performance of Nanosized $Li_2FeSiO_4$ Cathode Materials
    Autorzy:
    Wang, Y.
    Su, D.
    Wang, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399781.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.46.Hk
    68.37.-d
    Opis:
    Carbon-coated $Li_2FeSiO_4//C$ cathode materials have been synthesized through a modified ball-milling process. The physical characterizations of $Li_2FeSiO_4$ were conducted by using X-ray powder diffraction, field-emission scanning electron microscopy and transmission electron microscopy techniques. Field-emission scanning electron microscopy and transmission electron microscopy images revealed that $Li_2FeSiO_4//C$ consists of nanosized particles coated with an amorphous carbon layer. The electrochemical performances of $Li_2FeSiO_4//C$ cathode materials were evaluated through fully assembled lithium batteries via cyclic voltammetry, charge/discharge test and electrochemical impedance spectroscopy. The $Li_2FeSiO_4//C$ cathode materials showed a much improved electrochemical performance in terms of higher specific capacity, better cycling performance and less charge transfer resistance than that of the pristine $Li_2FeSiO_4$.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 279-282
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimized design and analysis of offshore Beidou maritime foundation reinforcement system pseudolite ranging-codes
    Autorzy:
    Su, D.
    Zhou, A.
    Zhou, Z.
    Chen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/260498.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Beidou pseudolite
    ranging-codes
    optimized
    3-taps
    Opis:
    Under the bad sea conditions and weak Beidou navigation signal environment, it is difficult to locate the ship on the sea, and the Beidou navigation system can’t work well. Beidou pseudolite system can improve the performance of Beidou navigation system as a navigation signal transmitter fixed on the ground, the signal of which can improve satellite positioning constellation structure, and improve the system availability reliability and precision. In order to ensure the interoperability and non-correlation of the Beidou pseudolite and the Beidou navigation system, the pseudolite ranging-codes should be selected in the same code space of the satellite ranging-codes and the residual pseudo random code generated by the 2 taps design scheme does not satisfy the performance requirements of the ranging-codes. To solve this issue, a combined design scheme with 3 taps is proposed, and 12 kinds of pseudolite ranging-codes are optimally selected according to the optimum design parameters of ranging-codes. The waveform and correlation of the selected pseudolite ranging-codes are analyzed by MATLAB, the acquisition simulation is carried out by using the new pseudolite ranging-codes. The experimental results show that the new 3-taps based ranging codes design scheme behaves a good balance, correlation and spectral characteristics.
    Źródło:
    Polish Maritime Research; 2017, S 2; 45-52
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of SNPs based on DNA specific-locus amplified fragment sequencing in Chinese fir (Cunninghamia lanceolata (Lamb.) Hook)
    Autorzy:
    Su, Y.
    Hu, D.
    Zheng, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41243.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    detection
    single nucleotide polymorphism
    DNA specific-locus amplified fragment sequencing
    fir
    Chinese fir
    Cunninghamia lanceolata
    genotyping
    Opis:
    Compared to angiosperms, conifers represent more complex genomes with larger giga-genome size. To detect large-scale single nucleotide polymorphisms (SNPs), whole genome sequencing of a conifer population is still unaffordable. In this work, we report the use of DNA specific-locus amplified fragment sequencing (SLAF-seq) for large-scale SNP detection in Chinese fir (Cunninghamia lanceolata (Lamb.) Hook), an ecological and economic important conifer in China. SLAF libraries of 18 parent clones of a Chinese fir 2.5 generation seed orchard were sequenced and a total of 117,924 SLAFs were developed. We detected 147,376 SNPs from these SLAFs; 146,231 of them represented simple nucleotide change in A/G, C/T, A/C, A/T, C/G or G/T. The most frequent SNPs occurred in C/T (34.3%), while the majority of SNPs (68.2%) belonged to transition events (A/G and C/T). Notably, all the sequenced samples had high portion (78.2–80.9%) of common SNPs indicating that the Chinese fir genomes tended to change its nucleotides at common loci. 48,406 informative SNPs were then successfully utilized to genotype the tested samples (n = 18) followed by a phylogenetic tree to clarify their genetic relationship. Furthermore, a set of very high linkage disequilibrium (0.51–1.00) were identified from these informative SNPs. In brief, our work demonstrated that SLAF-seq is an alternative and cost-effectively high-throughput approach for large-scale SNP exploitation in Chinese fir. While the obtained SNPs offer useful marker resource for further genetic and genomic studies and will be helpful for Chinese fir breeding programs.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Matched-field Source Localization with a Mobile Short Horizontal Linear Array in Offshore Shallow Water
    Autorzy:
    Zhao, D.
    Huang, Z.
    Su, S.
    Li, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/177986.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    passive source localization
    matched-field processing
    inter-position processing
    short horizontal array
    shallow water
    Opis:
    Passive source localization in shallow water has always been an important and challenging problem. Implementing scientific research, surveying, and monitoring using a short, less than ten meter long, horizontal linear array has received considerable attention in the recent years. The short array can be conveniently placed on autonomous underwater vehicles and deployed for adaptive spatial sampling. However, it is usually difficult to obtain a sufficient spatial gain for localizing long-range sources due to its limited physical size. To address this problem, a localization approach is proposed which is based on matched-field processing of the likelihood of the passive source localization in shallow water, as well as inter-position processing for the improved localization performance and the enhanced stability of the estimation process. The ability of the proposed approach is examined through the two-dimensional synthetic test cases which involves ocean environmental mismatch and position errors of the short array. The presented results illustrate the localization performance for various source locations at different signal- to-noise ratios and demonstrate the build up over time of the positional parameters of the estimated source as the short array moves at a low speed along a straight line at a certain depth.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 105-113
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional biomechanical modeling and simulation of trephine cutting cornea for keratoplasty
    Autorzy:
    Su, P.
    Lu, D.
    Deng, S.
    Zhang, L.
    Hao, Y.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/307486.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rogówka
    biomechanika
    kryterium wytężeniowe
    FEM
    cornea
    biomechanics
    failure criterion
    finite element simulation
    Opis:
    Trephination is one of the basic operations of keratoplasty, and the biomechanical mechanism of the operation can be revealed based on three-dimensional modeling and simulation of trephine cutting cornea. Methods: Based on the analysis of the physical and biomechanical characteristics of corneal trephination, a three-dimensional numerical model of corneal trephination is built, where the cornea can be simplified to two layers structure including stroma and epithelium, and the trephine cuts the cornea under the vertical motion load and the rotational motion load. A three-dimensional failure criterion of corneal material is proposed based on the yield strength theory. On this basis, trephination simulation is carried out, and the units of corneal material are removed from the model when they meet the defined failure criterion. Results: Under the given parameters including the velocity, the angle and the angular velocity, the trephine force curves, include the linear cutting force and the rotary cutting force are obtained, and show the change of the forces with displacement during the process of trephination simulation. The maps of the equivalent stress show the destruction and deformation of the cornea. Then, the experiment of robotic trephination is carried out under the same parameters and the effectiveness of the simulation is evaluated. Conclusions: Based on mechanics theory and finite element method, the process of trephine cutting cornea has been reproduced, and the interaction mechanism is revealed, which lays the foundation for the development of real-time simulation and virtual system of the corneal surgery.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 23-33
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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