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    Wyświetlanie 1-12 z 12
    Tytuł:
    Error mitigation algorithm based on bidirectional fitting method for collision avoidance of Unmanned Surface Vehicle
    Autorzy:
    Song, L.
    Chen, Z.
    Mao, Y.
    Dong, Z.
    Xiang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260298.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Unmanned Surface Vehicle
    position prediction
    error mitigation
    autoregressive model
    particle swarm optimization (PSO)
    Opis:
    Radars and sensors are essential devices for an Unmanned Surface Vehicle (USV) to detect obstacles. Their precision has improved significantly in recent years with relatively accurate capability to locate obstacles. However, small detection errors in the estimation and prediction of trajectories of obstacles may cause serious problems in accuracy, thereby damaging the judgment of USV and affecting the effectiveness of collision avoidance. In this study, the effect of radar errors on the prediction accuracy of obstacle position is studied on the basis of the autoregressive prediction model. The cause of radar error is also analyzed. Subsequently, a bidirectional adaptive filtering algorithm based on polynomial fitting and particle swarm optimization is proposed to eliminate the observed errors in vertical and abscissa coordinates. Then, simulations of obstacle tracking and prediction are carried out, and the results show the validity of the algorithm. Finally, the method is used to simulate the collision avoidance of USV, and the results show the validity and reliability of the algorithm.
    Źródło:
    Polish Maritime Research; 2018, 4; 13-20
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Path following control of the underactuated USV based on the improved line-of-sight guidance algorithm
    Autorzy:
    Liu, T.
    Dong, Z.
    Du, H.
    Song, L.
    Mao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/259559.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    unmanned surface vessel (USV)
    path following control
    Serret-Frenet coordinate frame
    underactuated system
    improved lineof-sight guidance algorithm
    nonlinear backstepping method
    Opis:
    The path following control problem of the underactuated unmanned surface vessel (USV) is studied in this paper. An improved line-of-sight (LOS) guidance algorithm is proposed which can adjust adaptively based on the path following error. The global asymptotically stable path following controller is designed based on the nonlinear backstepping method and the Lyapunov stability theory. Firstly, the USV path following error model is established in the Serret-Frenet (SF) coordinate frame. The path following error in the inertial coordinate frame is transformed into the SF coordinate frame, which is used to define the path following control problem. Secondly, inspired by the traditional LOS guidance algorithm, the longitudinal path following error in the SF coordinate frame is introduced into the improved LOS guidance algorithm. This allows the algorithm to adjust adaptively to the desired path. Thirdly, in order to solve the underactuated problem of the USV path following control system, the tangential velocity of the desired path is designed as a virtual input. The underactuated problem is converted to a virtual fully actuated problem by designing the virtual control law for the tangential velocity. Finally, by combining backstepping design principles and the Lyapunov stability theory, the longitudinal thrust control law and the yaw torque control law are designed for the underactuated USV. Meanwhile, the global asymptotic stability of the path following error is proved. Simulation experiments demonstrate the effectiveness and reliability of the improved LOS guidance algorithm and the path following controller.
    Źródło:
    Polish Maritime Research; 2017, 1; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperelastic behavior of two rubber materials under quasistatic and dynamic compressive loadings — testing, modeling and application
    Właściwości hipersprężyste materiałów gumowych w warunkach kwazistatycznych i dynamicznych obciążeń ściskających — badania, modelowanie i zastosowanie
    Autorzy:
    Mao, Y.
    Li, Y.
    Chen, Y.
    Miao, Y.
    Deng, Q.
    Niu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/947495.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    rubber
    hyperelastic behavior
    compressive loading
    constitutive model
    guma
    właściwości hipersprężyste
    obciążenie ściskające
    model konstytutywny
    Opis:
    The mechanical properties of two rubber materials, RB-55 rubber and FM-32 foam rubber, were tested under quasistatic and dynamic compressive loadings with a universal testing machine and a nonmetallic split Hopkinson pressure bar (SHPB), respectively. The results show that the hyperelasticity dominates the mechanical characteristics of the both materials. And the strain rate dependencies can be observed over the wide strain rate range from 10-2 s-1 to order 103 s-1. But in the rather narrow bands of 10-2—100 s-1 and 2 • 103 —6 • 103 s-1, the strain rate effects are not significant. In order to numerically simulate rod-explosive loading tests where the two rubber materials were used as a combined buffer, the strain rate-independent hyperelastic behaviors at the strain rate of order 103 s-1 were characterized by Ogden constitutive models, incompressible for RB-55 rubber and compressible for FM-32 foam rubber, respectively. The numerical prediction of the structural responses agrees very well with the experimental results. This means the testing and modeling are successful.
    Za pomocą uniwersalnej maszyny wytrzymałościowej oraz metodą pręta Hopkinsona (SHPB) zbadano właściwości mechaniczne gumy (RB-55) i gumy piankowej (FM-32) poddanych kwazistatycznym i dynamicznym obciążeniom ściskającym. Wyniki badań wskazały, że w materiałach tych dominują właściwości hipersprężyste. Krzywe zależności naprężenia od odkształcenia wyznaczono w szerokim zakresie szybkości odkształcania rzędu 10-2 — 103 s-1. Stwierdzono, że szybkość odkształcania nie wywiera istotnego wpływu na krzywe naprężenie-odkształcenie tylko w dość wąskich zakresach wartości, tj. 10-2 — 0 s-1 oraz 2 • 103 — 6 • 103 s-1. W celu numerycznego symulowania testów obciążeniowych metodą wybuchających prętów (z ang. rod-explosive loading tests), gdzie oba materiały gumowe pełniły rolę buforów, zastosowano model konstytutywny Ogdena, przeznaczony do analizy materiałów hipersprężystych. Wyniki symulacji numerycznych wykazały dobrą zgodność z wynikami doświadczalnymi.
    Źródło:
    Polimery; 2015, 60, 7-8; 516-522
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Processing Techniques on Mechanical Properties and Impact Initiation of an Al-PTFE Reactive Material
    Autorzy:
    Feng, B.
    Fang, X.
    Li, Y.-C.
    Wu, S.-Z.
    Mao, Y.-M.
    Wang, H.-X.
    Powiązania:
    https://bibliotekanauki.pl/articles/358654.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    Al-PTFE
    reactive materials
    quasi-static compression
    impact initiation
    Opis:
    Reactive materials (RMs) or impact-initiated materials have received much attention as a class of energetic materials in recent years. To assess the influence of processing techniques on mechanical properties and impact initiation behaviors of an Al-PTFE reactive material, quasi -static compression tests and drop-weight tests were performed. Scanning electron microscopy (SEM) was used to identify the characteristics of the interior microstructures of the Al-PTFE samples. A sintering process was found to transform Al-PTFE from a brittle to a ductile material with an increased elasticity modulus (from 108-160 MPa to 256-336 MPa) and yield stress (from 12-16 MPa to 19-20 MPa). Increasing the molding pressure from 36 MPa to 182 MPa increased the elastic modulus of all Al-PTFE samples and also the yield stress of unsintered ones. Unsintered samples in general required less energy to initiate than sintered ones. As the molding pressure increased, the impact initiation energy for sintered Al-PTFE fell from 96 J to 68 J, whereas the initiation energy for unsintered Al-PTFE rose from 68 J to 85 J. PTFE nanofiber networks observed in sintered samples formed under the higher molding pressures could contribute to the opposite trends observed in the impact initiation energy of unsintered and sintered Al-PTFE samples.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 4; 989-1004
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New specimens of the multituberculate mammal Sphenopsalis from China: Implications for phylogeny and biology of taeniolabidoids
    Autorzy:
    Mao, F.-Y.
    Wang, Y.-Q.
    Meng, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/20957.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new specimen
    multituberculate mammal
    mammal
    Sphenopsalis
    China
    phylogenesis
    biology
    taeniolabidoid
    Mammalia
    Multituberculata
    Taeniolabidoidea
    Paleogene
    Erlian Basin
    Inner Mongolia
    Opis:
    Multituberculates are the most diverse and best known group of Mesozoic mammals; they also persisted into the Paleogene and became extinct in the Eocene, possibly outcompeted by rodents that have similar morphological and presumably ecological adaptations. Among the Paleogene multituberculates, those that have the largest body sizes belong to taeniolabidoids, which contain several derived species from North America and Asia and some species with uncertain taxonomic positions. Of the known taeniolabidoids, the poorest known taxon is Sphenopsalis nobilis from Mongolia and Inner Mongolia, China, represented previously by a few isolated teeth. Its relationship with other multituberculates thus has remained unclear. Here we report new specimens of Sphenopsalis nobilis collected from the upper Paleocene of the Erlian Basin, Inner Mongolia, China, during a multi-year field effort beginning in 2000. These new specimens document substantial parts of the dental, partial cranial and postcranial morphologies of Sphenopsalis, including the upper and lower incisors, partial premolars, complete upper and lower molars, a partial rostrum, fragments of the skull roof, middle ear cavity, a partial scapula, and partial limb bones. With the new specimens we are able to present a detailed description of Sphenopsalis, comparisons among relevant taeniolabidoids, and brief phylogenetic analyses based on a dataset consisting of 43 taxa and 102 characters. In light of the new evidence, we assess the phylogenetic position of Sphenopsalis and re-establish the family Lambdopsalidae. The monophyly of Taeniolabidoidea is supported in all our phylogenetic analyses. Within Taeniolabidoidea the Asian lambdopsalids and the North American taeniolabidids represent two significantly different trends of adaptations, one characterized by shearing (lambdopsalids) and the other by crushing and grinding (taeniolabidids) in mastication, which supports their wider systematic separation, as speculated when Sphenopsalis was named.
    Źródło:
    Acta Palaeontologica Polonica; 2016, 61, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical transmission of PCV2b to fetuses in sows intramuscularly infected with PCV2b
    Autorzy:
    Wang, N.D.
    Li, J.J.
    Wang, A.B.
    Zhu, Z.
    Chang, Y.
    Mao, Y.
    Zan, Y.
    Wang, Z.F.
    Deng, Z.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/31535.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    In order to investigate whether PCV2b can be transmitted across the placenta in sows thereby causing vertical infection of fetuses, six sows in 75 day of pregnancy were either intramuscularly inoculated with a PCV2b culture supernatant (n = 4) or mock infected with cell culture supernatant (n = 2). At parturition, 3 newborn piglets from each litter were randomly selected and euthanatized prior to suckling. Samples of the mesenteric lymph nodes, spleens, kidneys, hearts and lungs were collected for PCR, histopathological and immunohistochemical assays. The results showed that the newborn piglets from PCV2b-infected sows had histopathological lesions in the tested tissues. Moreover, PCV2b antigen and DNA were detected as well. These findings therefore suggested that porcine circovirus type 2b can be transmitted across the placenta of sows, thereby leading to PCV2b vertical infection of the fetuses.
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Ephedra species by phylogenetic analyses using matK and ITS1 sequences
    Autorzy:
    Zhao, Y.S.
    Xie, L.X.
    Mao, F.Y.
    Cao, Z.
    Wang, W.P.
    Zhao, Q.P.
    Zhang, X.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/56673.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In this study, the species identifications of seven Ephedra plants, including three medicinal plants from the Pharmacopoeia of the People’s Republic of China, were conducted using phylogenetic analyses, and the method’s validity was verified. The phylogenetic trees constructed from the maturase-coding gene (matK) and internal transcribed spacer 1 (ITS1) sequences showed that the former could be used for identifying five Ephedra plants, Ephedra intermedia, E. equisetina, E. antisyphilitica, E. major, and E. aphylla, but it had less power to discriminate E. sinica and E. przewalskii, while the latter could distinguish five Ephedra plants, E. przewalskii, E. equisetina, E. antisyphilitica, E. major, and E. aphylla, but it had less power to discriminate E. sinica and E. intermedia. However, when the two genes were combined, the seven species could be completely distinguished from each other, especially the medicinal plants from the others, which is significant in developing their pharmaceutical uses and in performing quality control assessments of herbal medicines. The method presented here could be applied to the analysis of processed Ephedra plants and to the identification of the botanical origins of crude drugs. Additionally, we discovered that E. equisetina and E. major were probably closely related to each other, and that E. sinica, E. intermedia, and E. przewalskii also had a close genetic relationship.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of irrigation and planting patterns on photosynthetic capacity and grain quality of winter wheat
    Autorzy:
    Zhao, Y.X.
    Mao, X.M.
    Yong, Y.Y.
    Zhou, X.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082531.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    Triticum aestivum L.
    chlorophyll content index
    dry matter weight
    farinograph parameter
    Opis:
    With the shortage of water resources in recent years, water has become an important factor that limits the photosynthetic capacity and grain quality of winter wheat in the North China Plain. The experiment was conducted in 2011-2014, and the design of the two-factor split-plot was adopted, with three irrigation levels (0, 90, and 180 mm) for the main plot and three planting patterns (single-single row, single-double row, doubledouble row) for the subplot. The chlorophyll content index, net photosynthetic rate, and dry matter weight of winter wheat at different growth stages were measured, and the quality parameters of the grain were also measured after the harvest. The result indicated that irrigation increased the chlorophyll content index, net photosynthetic rate, grain protein, coarse starch and whiteness, which were favourable for producing dry matter and for seed formation. The chlorophyll content index, net photosynthetic rate, dry matter weight and gluten index of double-double row were higher than those of single-single row. Therefore, the 90 mm irrigation combined with the double-double row planting pattern is a good agronomic practice for winter wheat production, and beneficial for the improvement of flour quality in the North China Plain.
    Źródło:
    International Agrophysics; 2019, 33, 3; 313-321
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for improving the precision of on-line phase measurement profilometry
    Autorzy:
    Mao, Z
    Cao, Y
    Zhong, L
    Cao, S
    Powiązania:
    https://bibliotekanauki.pl/articles/174406.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    information optics
    Stoilov's algorithm
    phase measuring profilometry (PMP)
    on-line phase measurement profilometry (OPMP)
    phase-shifting
    pixel matching
    Opis:
    An on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed to measure the 3D shape of moving object. While only one frame sinusoidal grating is projected on the moving object, the equal phase-shifting step deformed patterns modulated by profile of the measured object can be captured at every equivalent moving distance of the measured object instead of digital phase-shifting. Stoilov’s algorithm is an equal phase-shifting step algorithm at an arbitrary phase-shifting step, which is suitable for on-line phase measurement profilometry. However, the arbitrary phase-shifting step of Stoilov’s algorithm depends on the captured deformed patterns, in which the digitized errors of digital light projector or CCD camera, and the disturbance of surrounding light could be introduced, it will lead to some abnormities in wrapped phase, such as the denominator in Stoilov’s algorithm could be zero, which could cause the reconstructed 3D profile of the measured object appear burr, distortion or aberration, even could not be reconstructed. So an on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed. The arbitrary phase-shifting step is retrieved by both pixel matching and fringe cycle calibration rather than the captured deformed patterns. Experiments verify the feasibility and effectiveness of the proposed on-line phase measurement profilometry.
    Źródło:
    Optica Applicata; 2015, 45, 1; 51-61
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The expression profile of miR-222b-5p/MAPK10 in spleens of SPF chickens infected with REV-SNV at 28-42 dpi
    Autorzy:
    Jiang, H.
    Gao, S.
    Mao, M.
    Diao, Y.
    Tang, Y.
    Hu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087117.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reticuloendotheliosis virus strain SNV
    RLRs signaling pathway
    gga-miR-222b-5p
    mitogen-activated protein kinase 10
    a dual-luciferase reporter gene experiment
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 3; 439-443
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on a square Cassegrain-type solar concentrating reflector with a double pyramid
    Autorzy:
    Zhang, Y.
    Yang, H.
    Jiang, P.
    Mao, S.
    Yu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/174264.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    concentrating reflector
    double pyramidal
    ray tracing
    Opis:
    A structure of a solar concentrating reflector is designed in this paper to improve the usage of solar energy. For the dark image which is the result of the secondary mirror in the new type of the Cassegrain solar concentrating system, a double pyramid system is used to improve this phenomenon. By eliminating the dark image, the system enhanced the concentration ratio and the working efficiency. Meanwhile, both the primary and secondary mirrors are shaped into a square section in order to get a better match with a square photovoltaic receiver. While the length of the primary mirror is 89m and the block ratio is 20%, the concentration ratio is equal to 118.86.
    Źródło:
    Optica Applicata; 2016, 46, 3; 461-471
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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