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    Wyświetlanie 1-9 z 9
    Tytuł:
    Overview of the existing heat storage technologies: sensible heat
    Autorzy:
    Bespalko, S.
    Miranda, A.
    Halychyi, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/105844.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    heat storage
    sensible heat
    solar energy
    zasobnik ciepła
    ciepło jawne
    energia solarna
    Opis:
    Over the past several decades, much attention has been given to the development of technologies utilizing solar energy to generate inexpensive and clean heat for heating purposes of buildings and even for electricity generation in the concentrating solar thermal power (CSTP) plants. However, unlike conventional heat generating technologies consuming coal, natural gas, and oil, heat produced by solar energy is intermittent because it is significantly affected by daily (day-night) and seasonal fluctuations in solar insolation. This fact issues a considerable challenge to the adoption of solar energy as one of the main renewable heat sources in the future. Therefore, along with the development of the different solar technologies, the heat storage technologies have also been the focus of attention. Use of the storage devices, able to accumulate heat, enables not only enhance the performance of the heating systems based on solar energy but also make them more reliable. This paper gives an overview of the various sensible heat storage technologies used in tandem with the fluctuating solar heat sources.
    Źródło:
    Acta Innovations; 2018, 28; 82-113
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impulsive Sound Detection Directly in Sigma-Delta Domain
    Autorzy:
    Miranda, I. D. dos S.
    Lima, A. C. de C.
    Powiązania:
    https://bibliotekanauki.pl/articles/176966.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impulsive signal detection
    sigma-delta modulation
    discrete cosine transform
    Opis:
    Recent implementations of Sigma-Delta (ΣΔ) converters have achieved low cost, low power consumption, and high integration while maintaining resolution as high as in Nyquist-rate converters. However, its usage implies demodulating the source signal delivered from ΣΔ modulation to Pulse-Code Modulation (PCM) on a pre-processing stage. This work proposes an algorithm based on Discrete Cosine Transform for impulsive signal detection to be applied directly on a modulated ΣΔ bitstream, targeting to reduce computational cost in acoustic event detection applications such as gunshot recognition systems. From pre-recorded impulsive sounds in ΣΔ format, it has been shown that the new method presents a similar error rate in comparison with traditional energy-based approaches in PCM, meanwhile, it reduces significantly the number of operations per unit time.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 255-261
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Definability in Infinitary Languages and Invariance by Automorphisms
    Autorzy:
    Rodrigues, Alexandre A.M.
    Filho, Ricardo C. Miranda
    de Souza, Edelcio G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368480.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Opis:
    Given a $\mathcal L_{\alpha\beta} ^E$-structure $E$, where $\mathcal L_{\alpha\beta} ^E$ is an infinitary language, we show that $\alpha$ and $\beta$ can be chosen in such way that every orbit of the group $G$ of automorphisms of $E$ is $\mathcal L_{\alpha\beta} ^E$-definable. It follows that two sequences of elements of the domain $D$ of $E$ satisfy the same set of $\mathcal L_{\alpha\beta}$-formulas if and only if they are in the same orbit of $G$.
    Źródło:
    Reports on Mathematical Logic; 2010, 45; 119-133
    0137-2904
    2084-2589
    Pojawia się w:
    Reports on Mathematical Logic
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
    Autorzy:
    Miranda, J.
    Lotliker, A.A.
    Baliareingh, S.K.
    Jena, A.K.
    Samanta, A.
    Sahu, K.C.
    Kumar, T.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079007.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    size class
    coastal water
    long-term variability
    satellite data
    statistical analysis
    Bengal Bay
    Opis:
    The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
    Źródło:
    Oceanologia; 2021, 63, 1; 40-50
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractal dimension and anisotropy of soil CO2 emission in an agricultural field during fallow
    Autorzy:
    La Scala, N.,Jr.
    Panosso, A.R.
    Pereira, G.T.
    Gonzalez, A.P.
    Miranda, J.G.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/24282.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Źródło:
    International Agrophysics; 2009, 23, 4; 353-358
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stem quality of Quercus cerris trees from Kosovo for the sawmilling industry
    Autorzy:
    Bajrakatri, A.
    Pimenta, R.
    Pinto, T.
    Miranda, I.
    Knapic, S.
    Nunes, L.
    Pereira, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/52852.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2018, 61, 201
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can concurrent teaching promote equal biomechanical adaptations at front crawl and backstroke swimming?
    Autorzy:
    Costa, M. J.
    Barbosa, T. M.
    Morais, J. E.
    Miranda, S.
    Marinho, D. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307054.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ekspertyza
    kinematyka ruchu
    pływak
    expertise
    kinematics
    swimmer
    Opis:
    Purpose: The biomechanical adaptations in front crawl and backstroke swimming, as influenced by the implementation of a concurrent teaching programme were analysed. Methods: Sixteen participants (19.75 ± 1.13 years) underwent a 30 weeks intervention characterized by an increasing complexity to accomplish motor skills in the following order: (i) lower limbs propulsion; (ii) lower limbs propulsion synchronized with breathing cycle; (iii) lower limbs propulsion synchronized with one upper limb action; (iv) lower limbs propulsion synchronized with both breathing cycle and one upper limb action; (v) full swimming stroke; (vi) motor trajectory of the arms stroke. Performance and biomechanics were measured at front crawl and backstroke during three time points throughout the programme. Results: There were improvements in performance over time at front crawl (21.49 s to 19.99 s, p < 0.01) and backstroke (27.15 s to 24.60 s, p = 0.01). Significant improvements were found for velocity at front crawl (1.13 m/s to 1.22 m/s, p < 0.01) and backstroke (0.92 m/s to 1.00 m/s, p < 0.01). Stroke frequency increased at backstroke (0.64 to 0.73 Hz, p = 0.01), while the intra-cyclic variation of the velocity decreased at front crawl (0.13 to 0.12%, p = 0.02). There was also a moderate-high inter-subject variability in response to the programme. Conclusions: These findings prove that a programme of 30 weeks teaching concurrently front crawl and backstroke is effective to promote similar biomechanical adaptations in low-tier swimmers. However, each subject shows an individual response to better adapt the biomechanical actions and to reach a higher level of expertise.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 81-88
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence of mycotoxins in talkan: a cereal-based food traditional for Turkic population
    Autorzy:
    Tattibayeva, D.
    Nebot, C.
    Miranda J.M.
    Abuova, A.B.
    Kizatova, M.Z.
    Vazquez, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087741.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    food-contamination
    corn
    fungi
    HPLC-MS/MS
    Kazakhstan
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 2; 333-341
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold
    Autorzy:
    Gonzalez-Trejo, J.
    Real-Ramirez, C. A.
    Miranda-Tello, R.
    Rivera-Perez, F.
    Cervantes-de-la-Torre, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/351515.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    submerged entry nozzle
    fluid-flow modifiers
    continuous casting of steel
    mold flow patterns
    turbulence
    Opis:
    Some of the most recent technologies that improves the performance in continuous casting process has installed infrastructure outside the mold to modify the natural fluid flow pattern to obtain a quasi-steady condition and promote a uniform solidified shell of steel. The submerged entry nozzle distributes the liquid steel in the mold and can be used to obtain the flow symmetry condition with external geometry improvements. The fluid flow conditioners were located near the outlet ports of the nozzle. The aim of the modifiers is to impose a pseudo symmetric pattern in the upper zone of the mold by inhibiting the fluid exchange between the zones created by conditioners. This work evaluates the effect of the thickness and length of the fluid-flow modifiers on the overall performance of the submerged nozzle. These properties of the fluid-flow modifiers were normalized based on two of the geometric dimensions of the standard equipment. Numerical and physical simulations suggest that the flow modifier should be as thin as possible.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 927-946
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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