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  • 1
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    On Riemann-Liouville and Caputo Derivatives (2011)
    Hindawi
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    Publikationsdatum: 2011-03-25
    Beschreibung: Recently, many models are formulated in terms of fractional derivatives, such as in control processing, viscoelasticity, signal processing, and anomalous diffusion. In the present paper, we further study the important properties of the Riemann-Liouville (RL) derivative, one of mostly used fractional derivatives. Some important properties of the Caputo derivative which have not been discussed elsewhere are simultaneously mentioned. The partial fractional derivatives are also introduced. These discussions are beneficial in understanding fractional calculus and modeling fractional equations in science and engineering.
    Print ISSN: 1026-0226
    Digitale ISSN: 1607-887X
    Thema: Mathematik
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    BICO MPPT: A Faster Maximum Power Point Tracker and Its Application for Photovoltaic Panels (2014)
    Hindawi
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    Publikationsdatum: 2014-02-28
    Beschreibung: This paper develops a maximum power point tracking (MPPT) algorithm to optimize photovoltaic (PV) array performance and make it more compatible to rapidly varying weather conditions. In particular, a novel extremum seeking controller (ESC), which uses a Bode ideal cutoff (BICO) filter in its structure, is designed and tested on a simulated PV array. The new algorithm is compared against the commonly used ESC MPPT algorithm with first-order filters. The BICO extremum seeking controller achieves transient rise to the MPP faster than the common extremum seeking MPPT, which is the faster and more robust method among all other methods. This claim has been discussed and proved mathematically in this paper, in addition to simulation illustrations. This faster extremum seeking algorithm enables PV systems to detect rapid variations in the environmental conditions like irradiation and temperature changes.
    Print ISSN: 1110-662X
    Digitale ISSN: 1687-529X
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Energietechnik
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Photobiomodulation on Bax and Bcl-2 Proteins and SIRT1/PGC-1α Axis mRNA Expression Levels of Aging Rat Skeletal Muscle (2014)
    Hindawi
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    Publikationsdatum: 2014-06-20
    Beschreibung: Objective. This study aimed to analyze the effects of low level laser irradiation (LLLI) on Bax and IGF-1 and Bcl-2 protein contents and SIRT1/PGC-1α axis mRNA expression levels to prevent sarcopenia in aged rats. Material and Methods. Twenty female Sprague Dawley rats (18 months old) were randomly divided into two groups ( per group): control (CON) and LLLI groups. The gallium-aluminum-arsenium (GaAlAs) laser irradiation at 810 nm was used in the single point contact mode (3.75 J/cm2; 0.4 cm2; 125 mW/cm2; 30 s). Bax, Bcl-2, and IGF-1 proteins and SIRT1/PGC-1α axis mRNA expression were assessed 24 h after LLLI on gastrocnemius in aged rat. Results. Gastrocnemius muscle weights, gastrocnemius mass/body mass, Bcl-2/BAX ratio, Bcl-2 protein, IGF-1 protein, and the mRNA contents in SIRT1, PGC-1α, NRF1, TMF, and SOD2 were significantly () increased by LLLI compared to CON group without LLLI. However, levels of BAX protein and caspase 3 mRNA were significantly attenuated by LLLI compared to CON group (). Conclusion. LLLI at 810 nm inhibits sarcopenia associated with upregulation of Bcl-2/BAX ratio and IGF-1 and SIRT1/PGC-1α axis mRNA expression in aged rats. This indicates that LLLI has potential to decrease progression of myocyte apoptosis in sarcopenic muscles.
    Print ISSN: 1110-662X
    Digitale ISSN: 1687-529X
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Energietechnik
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Destructive behavior of iron oxide in projectile impact (2017)
    Institute of Physics (IOP)
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    Publikationsdatum: 2017-12-15
    Beschreibung: The damage strain values of Q235-A surface oxide scale were obtained by scanning electron microscopy (SEM/EDS) and universal tensile testing machine. The finite element simulation was carried out to study the destruction effects of oxidation at different impact rates. The results show that the damage value of the oxide strain is 0.08%. With the increase of the projectile velocity, the damage area of the oxide scale is increased, and the damage area is composed of the direct destruction area and the indirect failure area. The indirect damage area is caused by the stress/strain to the surrounding expansion after the impact of the steel body.
    Print ISSN: 1757-8981
    Digitale ISSN: 1757-899X
    Thema: Maschinenbau
    Publiziert von Institute of Physics (IOP)
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Comparison of Chebyshev and Legendre Polynomial Expansion of Phase Function of Cloud and Aerosol Particles (2017)
    Hindawi
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    Publikationsdatum: 2017-01-01
    Beschreibung: Chebyshev and Legendre polynomial expansion is used to reconstruct the Henyey-Greenstein phase function and the phase functions of spherical and nonspherical particles. The result of Legendre polynomial expansion is better than that of Chebyshev polynomial for around 0-degree forward angle, while Chebyshev polynomial expansion produces more accurate results in most regions of the phase function. For large particles like ice crystals, the relative errors of Chebyshev polynomial can be two orders of magnitude less than those of Legendre polynomial.
    Print ISSN: 1687-9309
    Digitale ISSN: 1687-9317
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    A New Parallel Method for Binary Black Hole Simulations (2016)
    Hindawi
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    Publikationsdatum: 2016-01-01
    Beschreibung: Simulating binary black hole (BBH) systems are a computationally intensive problem and it can lead to great scientific discovery. How to explore more parallelism to take advantage of the large number of computing resources of modern supercomputers is the key to achieve high performance for BBH simulations. In this paper, we propose a scalable MPM (Mesh based Parallel Method) which can explore both the inter- and intramesh level parallelism to improve the performance of BBH simulation. At the same time, we also leverage GPU to accelerate the performance. Different kinds of performance tests are conducted on Blue Waters. Compared with the existing method, our MPM can improve the performance from 5x speedup (compared with the normalized speed of 32 MPI processes) to 8x speedup. For the GPU accelerated version, our MPM can improve the performance from 12x speedup to 28x speedup. Experimental results also show that when only enough CPU computing resource or limited GPU computing resource is available, our MPM can employ two special scheduling mechanisms to achieve better performance. Furthermore, our scalable GPU acceleration MPM can achieve almost ideal weak scaling up to 2048 GPU computing nodes which enables our software to handle even larger BBH simulations efficiently.
    Print ISSN: 1058-9244
    Digitale ISSN: 1875-919X
    Thema: Informatik , Medien- und Kommunikationswissenschaften, Kommunikationsdesign
    Publiziert von Hindawi
    Standort Signatur Erwartet Verfügbarkeit
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