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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of large particle sizes using a machine vision system
    Autorzy:
    Zhang, Z.
    Yang, J.
    Su, X.
    Ding, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/109404.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    machine vision
    particle size distribution
    equivalent ellipse
    best-fit rectangle
    representing analysis
    Opis:
    Many methods based on machine vision were used to estimate coarse particles size distribution in recent years, but comparison of accuracy parameters representing particle size has not been carried out and a related representing analysis has not been yet proposed. Nine parameters were investigated. The results indicated the minor axis of equivalent ellipse and breadth of the best-fit rectangle were the most suitable for representing particle size. The former accuracy ratio was 86.43% and the latter accuracy ratio was 85.39%, while the accuracy of other parameters was less than 70%. A related representing analysis was proposed to explain this phenomenon. This research is instructive and meaningful for the size distribution estimation by machine vision.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 397-405
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bionic shape design of electric locomotive and aerodynamic drag reduction
    Autorzy:
    Wu, Z.
    Huo, Y.
    Ding, W.
    Xie, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/224333.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric locomotive
    bionic shape design
    aerodynamic drag
    numerical simulation
    crocodile bionic electric locomotive
    lokomotywa elektryczna
    bioniczny design
    opór aerodynamiczny
    symulacja numeryczna
    Opis:
    Bionics has been widely used in many fields. Previous studies on the application of bionics in locomotives and vehicles mainly focused on shape optimisation of high-speed trains, but the research on bionic shape design in the electric locomotive field is rare. This study investigated a design method for streamlined electric locomotives according to the principles of bionics. The crocodiles were chosen as the bionic object because of their powerful and streamlined head shape. Firstly, geometric characteristic lines were extracted from the head of a crocodile by analysing the head features. Secondly, according to the actual size requirements of the electric locomotive head, a free-hand sketch of the bionic electric locomotive head was completed by adjusting the position and scale of the geometric characteristic lines. Finally, the non-uniform rational B-splines method was used to establish a 3D digital model of the crocodile bionic electric locomotive, and the main and auxiliary control lines were created. To verify the drag reduction effect of the crocodile bionic electric locomotive, numerical simulations of aerodynamic drag were performed for the crocodile bionic and bluff body electric locomotives at different speeds in open air by using the CFD software, ANSYS FLUENT16.0. The geometric models of crocodile bionic and bluff body electric locomotives were both marshalled with three cars, namely, locomotive + middle car + locomotive, and the size of the two geometric models was uniform. Dimensions and grids of the flow field were defined. And then, according to the principle of motion relativity, boundary conditions of flow field were defined. The results indicated that the crocodile bionic electric locomotive demonstrated a good aerodynamic performance. At the six sampling speeds in the range of 40–240 km/h, the aerodynamic drag coefficient of the crocodile bionic electric locomotive decreased by 7.7% on the average compared with that of the bluff body electric locomotive.
    Źródło:
    Archives of Transport; 2018, 48, 4; 99-109
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of large-scale streamlined head cars of high-speed trains and aerodynamic drag calculation
    Autorzy:
    Wu, Z.
    Yang, E.
    Ding, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/224065.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high speed train
    NURBS
    aerodynamic drag
    streamlined head car
    numerical simulation
    pociąg ekspresowy
    opór aerodynamiczny
    symulacja numeryczna
    Opis:
    Aerodynamic drag plays an important role in high-speed trains, and how to reduce the aerodynamic drag is one of the most important research subjects related to modern railway systems. This paper investigates a design method for large-scale streamlined head cars of high-speed trains by adopting NURBS theory according to the outer surface characteristics of trains. This method first created the main control lines of the driver cab by inputting control point coordinates; then, auxiliary control lines were added to the main ones. Finally, the reticular region formed by the main control lines and auxiliary ones were filled. The head car was assembled with the driver cab and sightseeing car in a virtual environment. The numerical simulation of train flow field was completed through definition of geometric models, boundary conditions, and space discretization. The calculation results show that the aerodynamic drag of the high-speed train with large-scale streamlined head car decreases by approximately 49.3% within the 50-300 km/h speed range compared with that of the quasi-streamlined high-speed train. This study reveals that the high-speed train with large-scale streamlined head car could achieve the purpose of reducing running aerodynamic drag and saving energy, and aims to provide technical support for the subsequent process design and production control of high-speed train head cars.
    Źródło:
    Archives of Transport; 2017, 44, 4; 89-97
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational Investigation on the Structure and Performance of Novel 4,7-dinitro-furazano-[3,4-d]-pyridazine Derivatives
    Autorzy:
    Wang, K.
    Shu, Y.
    Liu, N.
    Ding, X.
    Wu, Z.
    Lu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358090.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    4,7-dinitro-furazano-[3,4-d]-pyridazine
    heat of formation
    density
    detonation performance
    bond dissociation energy
    Opis:
    Seven novel energetic 4,7-dinitro-furazano-[3,4-d]-pyridazine derivatives were designed, and their optimized structures and performances were studied by density functional theory (DFT) at B3LYP/6-311g(d,p) level. The detonation performances were estimated by the Kamlet-Jacobs equations. The results show that these compounds have high crystal densities (1.818-1.925 g·cm−3), detonation velocities (8.51-9.56 km·s−1) and detonation pressures (32.28-41.70 GPa). The bond dissociation energies (BDEs) of the weakest bond (N–O bond) vary from 70.889 kJ·mol−1 to 173.283 kJ·mol−1, and some of them exhibit higher BDEs than that of RDX (N–NO2 bond, 149.654 kJ·mol−1) and HMX (N–NO2 bond, 154.905 kJ·mol−1). M4 and M5 exhibit similar and higher detonation performance than RDX (8.81 km·s−1, 34.47 GPa). The detonation performance of M7 (9.56 km·s−1, 41.70 GPa) even surpasses that of HMX (9.10 km·s−1, 39.00 GPa). Otherwise, the specific impulse values of M1-M7 (266-279 s) outperform HMX (266 s) by 0-13 s, which indicates that M1-M7 may show better performance as monopropellants. It is concluded that density, heat of formation, stability, detonation performance and specific impulse of the designed compounds depend on the position and number of the N→O oxidation bonds.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 26-46
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of dispersion order on the spectral degree of polarization of stochastic electromagnetic pulsed beams
    Autorzy:
    Wang, H.
    Ding, C.
    Zhang, Y.
    Zhao, Z.
    Pan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/173625.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stochastic electromagnetic Bessel–Gauss pulsed beams
    dispersive aperture lens
    pulse
    duration
    temporal coherence length
    Opis:
    The analytical expression for the cross-spectral density function of stochastic electromagnetic Bessel–Gauss pulsed beams through a dispersive aperture lens is derived and used to study the changes in the spectral degree of polarization in an optical focus system. The changes in the spectral degree of polarization at the focal plane and on the z-axis are performed in the case of dispersion-free, dispersion of the first, second, and higher orders, respectively. It is shown that the dispersion affects the peak value of the spectral degree of polarization, and the higher order dispersion leads to a more obvious effect on the peak value of the spectral degree of polarization at the focal plane. On the z-axis, the spectral degree of polarization in the dispersion-free case is different form that in the dispersion case, however, the dispersion of different orders almost has the same effect on the spectral degree of polarization. The results obtained in this paper may be crucial for high precision laser detection.
    Źródło:
    Optica Applicata; 2014, 44, 1; 147-158
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural Fibres From the Bark of Mulberry Branches for Textile Application
    Włókna naturalne do zastosowań tekstylnych otrzymywane z kory gałęzi morwy
    Autorzy:
    Dong, Z.
    Ding, Z.
    Zhang, S.
    Zhang, Y.
    Fan, H.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/231858.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    mulberry fibers
    cellulose
    pectin
    spinning
    bacteria
    włókna z kory morwy
    celuloza
    pektyna
    szczepy bakterii
    Opis:
    Fibers with low gum content were extracted from the bark of mulberry branches by a combination of bacteria and peroxide treatments. The bark of mulberry branches, with 30% cellulose, is a copious and inexpensive source of natural fibers. However, fibers extracted by microwave, enzyme or alkali had a high gum content (15.5% for hemicellulose and 8.6% for lignin), which rendered them difficult to be made into high- value textiles. In this research, strains with high polygalacturonase activities and subsequent hydrogen peroxide decreased the hemicellulose content to 2.5% and lignin content to 2.4%. Mulberry fibers in our study could be spun into yarns with a fineness of 18.2 tex. Compared to flax yarns, mulberry fiber yarns had a tenacity 20% higher, an elongation 18% higher and an unevenness 30% lower. Cotton/mulberry fiber fabrics had softer and smoother hand than cotton/flax fabrics. Overall, the fibers in our study show better potential for industrial textile applications than those in previous studies.
    Kora gałęzi morwy jest bogatym i niedrogim źródłem włókien naturalnych. W pracy przedstawiono proces otrzymywania włókien z kory morwy z wykorzystaniem szczepów bakteryjnych oraz nadtlenku wodoru, co zmniejszyło zawartość hemicelulozy do 2,5% i zawartości ligniny do 2,4%. W porównaniu do przędz lnianych, przędze z włókien morwy wykazywały o 20% wyższą wytrzymałość, o 18% wyższe wydłużenie i o 30% niższą nierównomierność. Tkaniny bawełniane z dodatkiem morwy miały bardziej miękki i gładszy chwyt, niż tkaniny bawełniane z dodatkiem lnu. Stwierdzono, że metoda pozyskiwania włókien z kory morwy przy zastosowaniu bakterii i nadtlenku wodoru może być stosowana do wyodrębniania włókien morwowych w celu produkcji wyrobów o wysokiej wartości i szerokim spektrum możliwości zastosowań przemysłowych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 3 (123); 20-25
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Collosion and Absorption Behaviors of Inclusions on Refractory
    Autorzy:
    Ding-Guo, Z.
    Ming, G.
    Xin, L.
    Shu-Huan, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/352357.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inclusion
    refractory wall surface
    collision and absorption
    critical stay speed
    Opis:
    The paper is dedicated to analysis the inclusion behavior in steel using theoretical calculation and simulation of water. The aim is to establish collision and absorption model of inclusions on refractory. The article discusses the variation of critical stay speed and critical shear with the radius of inclusions in the process of colliding, rebounding and absorbing. The results show the critical stay speed and critical shear of alumina respectively surpasses 1 cm·s-1 and 1 N·m-2, while titanium dioxide separately exceeds 4 cm·s-1 and 10 N·m-2 for the inclusions that radius is less than 2.5 μm. If the inclusions occur rebound after colliding, the inclusions that radius is less than 7 μm will still be absorbed by the surface, while the inclusions that radius is more than 10 μm can easily reenter the steel. The model coincides with the water simulation results and it is of good adaptability.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 857-863
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coating of LiBH4 and Its Effect on the Decomposition of RDX and AP
    Autorzy:
    Ding, X.
    Shu, Y.
    Chen, Z.
    Liu, N.
    Gou, B.
    Zhang, J.
    Wu, M.
    Xie, G.
    Dang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358086.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    coating
    hydride
    additive
    hygroscopicity
    DSC
    Opis:
    The novel fuel additive LiBH4 was introduced as an energetic component for its outstanding hydrogen content, perfect burning performance and high reactivity. In order to limit the hygroscopicity and to improve the stability in the air, LiBH4 was coated on the surface with wax and polyester carbonate. The final product was characterized by scanning electron microscopy (SEM), X-ray photoelectron energy spectroscopy (XPS) and Raman spectroscopy, while the stability in air was investigated by regular checking of variations in weight. The results show that a uniform coating layer was formed on the surface of the LiBH4, and the coverage was estimated from the boron content as approximately 82%. A healing effect was confirmed on defective surfaces exposed to air; the coating layer improves the relative stability by 50.7%. Furthermore, LiBH4 as an additive to promote the thermal decomposition of 1,3,5-trinitro-1,3,5-trazinane (RDX) and ammonium perchlorate (AP) was explored by differential scanning calorimetry (DSC), in which the catalytic effects of pure LiBH4 and coated LiBH4 were compared, and indicated that the coating does not decrease the reactivity of LiBH4. It is suggested that surface coating with some inert materials is a simple and effective method for improving the storage and performance of LiBH4, while ensuring its reactivity.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 134-151
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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