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    Wyświetlanie 1-46 z 46
    Tytuł:
    The forwarding indices of graphs - a survey
    Autorzy:
    Xu, J.-M.
    Xu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255669.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    graph theory
    vertex-forwarding index
    edge-forwarding index
    routing
    networks
    Opis:
    A routing R of a connected graph G of order n is a collection of n(n — 1) simple paths connecting every ordered pair of vertices of G. The vertex-forwarding index £(G,R) of G with respect to a routing R is defined as the maximum number of paths in R passing through any vertex of G. The vertex-forwarding index £(G) of G is defined as the minimum £(G,R) over all routings R of G. Similarly, the edge-forwarding index π (G,R) of G with respect to a routing R is the maximum number of paths in R passing through any edge of G. The edge-forwarding index π (G) of G is the minimum π(G, R) over all routings R of G. The vertex-forwarding index or the edge-forwarding index corresponds to the maximum load of the graph. Therefore, it is important to find routings minimizing these indices and thus has received much research attention for over twenty years. This paper surveys some known results on these forwarding indices, further research problems and several conjectures, also states some difficulty and relations to other topics in graph theory.
    Źródło:
    Opuscula Mathematica; 2013, 33, 2; 345-372
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generating new styles of Chinese strokes based on statistical model
    Autorzy:
    Xu, M.
    Dong, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943264.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    figurative thinking
    Principal Components Analysis
    Bézier curve
    Opis:
    Chinese calligraphy is one of the most important Chinese arts: a form of entertainment as well as an embodiment of figurative thinking. In this paper, a statistical model-based approach to generating new styles of Chinese character strokes is proposed. Original calligraphy samples are aligned in a common co-ordinate frame and a training set consisting of landmarks is generated semi-automatically. The most significant features of the training set are extracted and a statistical model is built in order to generate strokes in new styles. The Bezier curve is used to fit the discrete contour data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 1-2; 129-136
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation model and state analysis of ship transmission line
    Autorzy:
    Hu, Y.
    Xu, M.
    Li, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/259613.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ship power
    transmission line
    simulation model
    insulation deterioration
    Opis:
    In order to discuss the simulation model of the ship transmission line and the state of the transmission line, an early fault model is built according to the evolution principle of the short circuit fault of the transmission line and combining with the fault characteristics of the early fault. A small distributed ship transmission line system is built in MATLAB/ Simulink. Then, combined with the constructed fault module, the original short circuit module, and the load module, the various states (normal state, early fault state, severe early fault state, short circuit state) of the ship transmission line are stimulated, and the features of voltage signal in each state is analysed. It is concluded that, due to the normal operation of the ship transmission line system, the variation characteristics of the flow signal and voltage signal caused by the sudden load mutation, that is, the sudden load and the sudden increase load, are very similar to the changes caused by the early fault. Therefore, in order to find a more accurate early fault detection method, the state is divided into normal state, sudden load state, sudden increase and sudden decrease load state.
    Źródło:
    Polish Maritime Research; 2018, S 3; 36-42
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed Pseudo-orthogonal Frequency Coding for SAW RFID Tags
    Autorzy:
    Xu, M.
    Xiao, X.
    Yuan, Q.
    Zong, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/176715.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SAW RFID tag
    OFC
    POFC
    Mixed-POFC
    mixed pseudo-orthogonal frequency coding
    COMSOL
    Opis:
    A mixed pseudo-orthogonal frequency coding (Mixed-POFC) structure is proposed as a new spreadspectrum technique in this paper, which employs frequency and time diversity to enhance tag properties and balances the spectrum utilization and code diversity. The coding method of SAW RFID tags in this paper uses Mixed-POFC with multi-track chip arrangements. The cross-correlation and auto correlation of Mixed-POFC and POFC are calculated to demonstrate the reduced overlap between the adjacent center frequencies with the Mixed-POFC method. The center frequency of the IDT and Bragg reflectors is calculated by a coupling of modes (COM) module. The combination of the calculation results of the Bragg reflectors shows that compared with a 7-chip POFC, the coding number of a 7-chip Mixed-POFC is increased from 120 to 144 with the same fractional bandwidth of 12%. To demonstrate the validity of Mixed-POFC, finite element analysis (FEA) technology is used to analyze the frequency characteristics of Mixed-POFC chips. The maximum error between designed frequencies and simulation frequencies is only 1.7%, which verifies that the Mixed-POFC method is feasible.
    Źródło:
    Archives of Acoustics; 2018, 43, 4; 681-687
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expression and immunogenicity study of a novel mhp183 gene fragment of Mycoplasma hyopneumoniae
    Autorzy:
    Xu, M.
    Zheng, J.
    Hu, S.
    Wang, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087132.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mycoplasma hyopneumoniae
    Mhp183 gene
    new generation vaccines
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 4; 553-561
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of PolyNIMMO-HTPB-polyNIMMO Triblock Copolymer as a Potential Energetic Binder
    Autorzy:
    Wang, X.
    Shu, Y.
    Lu, X.
    Mo, H.
    Xu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358529.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    triblock copolymer
    cationic ring opening polymerization
    polymer
    DSC
    Opis:
    Triblock copolymer polyNIMMO-HTPB-polyNIMMO was synthesized by cationic ring opening polymerization of NIMMO (3-nitratomethyl-3-methyloxetane) in the presence of hydroxyl-terminated polybutadiene catalyzed by BF3·OEt2. The polymer was characterized by FT-IR, 1H NMR, 13C NMR spectroscopy, and GPC. DSC was used to investigate the thermal behaviour of the triblock copolymer and its exothermic decomposition peak was found to be at 215 °C. All of the results indicated that the triblock copolymer polyNIMMO-HTPB-polyNIMMO might serve as a potential energetic propellant binder.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 3; 456-467
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A note on the p-domination number of trees
    Autorzy:
    Lu, Y.
    Hou, X.
    Xu, J.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255183.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    p-domination number
    trees
    Opis:
    Let p be a positive integer and G = (V (G), E(G)) a graph. A p-dominating set of G is a subset S of V (G) such that every vertex not in S is dominated by at least p vertices in S. The p-domination number ϒp(G) is the minimum cardinality among the p-dominating sets of G. Let T be a tree with order n ≥ 2 and p ≥ 2 a positive integer. A vertex of V (T) is a p-leaf if it has degree at most p - 1, while a p-support vertex is a vertex of degree at least p adjacent to a p-leaf. In this note, we show that ϒp(T) ≥ (n + /Lp(T)/ - /Sp(T)/)/2, where Lp(T) and Sp(T) are the sets of p-leaves and p-support vertices of T, respectively. Moreover, we characterize all trees attaining this lower bound.
    Źródło:
    Opuscula Mathematica; 2009, 29, 2; 157-164
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review and future perspectives on the integration characteristics for equine lentivirus in the host genome
    Autorzy:
    Yu, Y.-Y.
    Xu, M.-S.
    Liang, H.
    Wang, H.-Y.
    Yu, C.-Q.
    Liu, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647532.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    lentivirus
    equine infectious anemia virus
    integration
    long interspersed elements
    Opis:
    Despite over 40 years of research on the human immunodeficiency virus type 1 (HIV-1) vaccine, we still lack a considerable progress. Equine infectious anemia virus (EIAV) is a lentivirus in the Retroviridae family, akin to HIV-1 in genome structure and antigenicity. EIA is an important infectious disease in equids, characterized by anemia, persistent infection, and repeated fevers. The EIAV attenuated vaccine in China is the only lentiviral vaccine used on a large scale. Elucidating the mechanism of waning and induction of protective immunity from this attenuated vaccine strain will provide a critical theoretical basis and reference point for vaccine research, particularly in the development of lentivirus vaccines, with far-reaching scientific value and social significance. In this paper, we summarize the information related to EIAV integration site selection, particularly for the Chinese EIAV attenuated vaccine strains on the equine genome. This may improve our mechanistic understanding of EIAV virulence reduction at the host genome level. The obtained data may help elucidate the biological characteristics of EIAV, particularly the Chinese attenuated EIAV vaccine strain, and provide valuable information regarding retroviral infections, particularly lentiviral infection and associated therapeutic vectors.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 163-172
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal dynamics in cambial activity and the formation of xylem and phloem in the branches of Cinnamomum camphora
    Autorzy:
    Dong, M.
    Xu, Y.M.
    Lin, H.
    Li, X.Q.
    Xia, Q.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/41385.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seasonal dynamics
    cambial activity
    formation
    xylem
    phloem
    branch formation
    tree
    tropical tree
    Cinnamomum camphora
    wood formation
    phenology
    Opis:
    The cambial activity and periodicity of secondary xylem and phloem formation have been less studied in tropical tree species than in temperate ones. Cambium activity is the only source of timber production. Studies on its activity and xylem formation can provide helpful data for dendrochronology and possible factors that control tree growth, the yield and quality of wood. Cinnamomum camphora is an important fast-growing tree for furniture and sculpture wood in South China. Its dynamics of cambial activity was not reported. During the growth season in 2011, five trees of Cinnamomum camphora plantation were monitored on the campus of Huazhong Agricultural University in central china (located on 113°41’ to 115°05’ E and 29°58’ to 31°22’ N). Sampling time was from 13, February 2011 to 13, February 2012. Some small stems of 15–20 cm length were selected to sample in the middle of 2–3 years old health branches in the central crown of these trees. The observational study found that the cambium of camphor trees was active from March to October and dormant from November to February. Onset of cambial cell division was observed in early March, one week after sprouting of new buds. The morphology of the cells and number of cell layers in the cambium zone varied throughout the year. In early March, cambium reactivated with the rising of temperature, the cell wall was relative thick. The number of cell layers increased from 2–3 in middle Feb. to 3–5. In June, the number of cell layers in cambium reached the maximum of 5–7 in a radial direction. In mid March, phloem cells began to differentiate, followed by xylem three weeks later. The number of cell layers in immature phloem and xylem increased dramatically before mid June and the increment of cell layers in xylem was almost fifth times of phloem in the differentiating process. The phloem cells mainly stopped dividing new cells in end of October, but xylem cells were still in the activity a week later. The annual activities of cambium was in accordance with the air mean temperature change in 2011–2012. The results showed that the cambial activity and formation of xylem and phloem were related to the environmental factors, especially the temperature.
    Źródło:
    Dendrobiology; 2016, 75
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of injection pressure and strategy in a Jaguar V6 diesel engine
    Autorzy:
    Abdullah, N. R.
    Mamat, R.
    Rounce, P.
    Wyszynski, M. L.
    Tsolakis, A.
    Xu, H. M.
    Tian, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/242414.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion
    emissions
    injection strategies
    premixed combustion
    ignition delay
    Opis:
    In recent years, the improvement of engine performance and emissions has become an extremely important concern. This study focuses on the injection strategy based on the injection pressure (IP) and duration between pilot injection and the main injection (dMI) using a multi cylinder common rail multiple injections diesel engine. The study was designed to produce improvements in fuel mixing via the injection strategy, to reduce the main ignition delay. This would contribute to a minimum amount of fuel burnt in the premixed combustion phase, leading to a reduction in emissions. Recent evidence shows that premixed combustion is significant in the controlling of emissions of nitrogen oxides (NOx) and soot. Six different IPs combined with a short and long dMI were compared in the attempt to improve engine performance and emissions. The engine performance was measured in terms of brake specific fuel consumption, ignition delay, heat release and peak in-cylinder pressure and emissions, specifically nitrogen oxides (NOx), total unburned hydrocarbons (THC), carbon monoxide (CO) and smoke emissions for each engine test condition. The evidence from this study shows that the effect of IP is more dominant than dMI in terms of peak cylinder pressure, heat release, brake specific fuel consumption and emissions. However, the dMI shows a strong effect at a higher engine speed.
    Źródło:
    Journal of KONES; 2009, 16, 2; 9-22
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation into particulate size distributions in the exhaust gas of diesel engines fuelled with biodiesel blends
    Autorzy:
    Chuepeng, S.
    Theinnoi, K.
    Xu, H. M.
    Wyszynski, M. L.
    York, A. P. E.
    Hartland, J. C.
    Qiao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/248072.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    biodiesel
    PM
    combustion
    diesel
    PM size distribution
    Opis:
    Particulate matter (PM) size distributions in the exhaust gas of biodiesel blend fuelled diesel engines have been studied by experimenting firstly on a single cylinder equipped with a pump-line-injector injection system and secondly for comparison on a V6 DI engine equipped with a common rail fuel injection system. Both engines were operated with a biodiesel (RME) blend of B30 and ultra low sulphur diesel fuel (ULSD). Several engine load conditions with and without exhaust gas recirculation (EGR) were selected. Particulate number concentrations vs. the electrical mobility equivalent diameter were examined using a fast differential mobility spectrometer. The effect of engine operating conditions including EGR rates on particulate emissions has been investigated. It is found that PM sizes from combustion of B30 without EGR operation are generally smaller than those from ULSD while number concentrations are higher. This can result in lower PM mass estimates for the B30 case if due care is not taken. When EGR is applied to control nitrogen oxides emissions, both the total PM number and mass are increased and shifted toward the larger sizes for both fuels used in the test. The calculated total PM mass from B30 combustion is lower than in the ULSD case for all the tested engine operating conditions.
    Źródło:
    Journal of KONES; 2008, 15, 3; 75-82
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antagonism of salicylic acid signalling on apoplastic reactive oxygen species signalling
    Autorzy:
    Xu, E.
    Brosche, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/80426.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    salicylic acid
    antagonism
    reactive oxygen species
    signalling pathway
    jasmonic acid
    gene expression
    dnd1 mutant
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Memoryless equilibrium strategies in multilevel decision processes of discrete-time descriptor systems
    Autorzy:
    Xu, H.
    Mizukami, K.
    Kobara, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/205573.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    gra dynamiczna
    description system
    discrete-time system
    dynamics games
    memoryless equilibrium strategies
    Opis:
    Applying a general theorem developed by Basar (1981), providing a set of sufficient conditions for a triple of strategies to be in hierarchical equilibrium, to games in normal (strategic) form, we study three-player Stackelberg games for linear quadratic discrete-time descriptor systems with three levels of hierarchy in decision making. We derive explicitly sufficient conditions for the existence of the memoryless hierarchical equilibrium strategies for the player (called P[sub 1]) at the top of the hierarchy, and for the player (called P[sub 2]) at the second level of the hierarchy. Since the resulting hierarchical equilibrium strategies do not depend on the memory information, P[sub 1]'s original optimal team cost remains the tight (attainable) lower bound for P[sub 1]'s cost function no matter whether the players at the lower levels of hierarchy act or not at the last two (or one) stages. Moreover, the resulting strategies have the advantages of simpler structure and higher credibility. A numerical example is solved to illustrate the validity of the results.
    Źródło:
    Control and Cybernetics; 1998, 27, 1; 81-103
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse Problem of Textile Material Design at Low Temperature Solved by a Hybrid Stochastic Algorithm
    Rozwiązanie problemu inwersyjnego projektowania materiałów włókienniczych stosowanych w niskich temperaturach za pomocą hybrydowego algorytmu stochastycznego
    Autorzy:
    Weng, M
    Xu, D
    Zhou, X
    Powiązania:
    https://bibliotekanauki.pl/articles/232769.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    inverse problem
    textile design
    hybrid stochastic algorithm
    optimisation method
    problem inwersyjny
    projektowanie tkanin
    hybrydowy algorytm stochastyczny
    metody optymalizacji
    Opis:
    The inverse problem of textile material design (IPTMD) aims to determine textile materials with optimum thermal conductivities for the thickness designed in terms of the thermal comfort requirements of the wearer. In this paper, an IPTMD is presented on the basis of the physical nature of steady heat and moisture transfer in a human body-clothing-environment system. A globally convergent algorithm, the modified particle collision algorithm (MPCA), is proposed and its validity is verified. The MPCA is applied to solve the IPTMD for single-layer textile materials at low temperature. Numerical simulation results of the IPTMD proved the suitability of the IPTMD and effectiveness of the MPCA in solving complex global optimisation problems. The encouraging results indicate that the modelling method above and optimisation algorithm can be used for further applications.
    Problem inwersyjny projektowania materiałów włókienniczych ma na celu określenie materiałów włókienniczych z optymalną przewodnością cieplną dla grubości zaprojektowanej z uwzględnieniem komfortu termicznego i wygody użytkownika. W pracy przedstawiono problem na podstawie stałego przepływu ciepła i wilgotności pomiędzy ciałem człowieka, odzieżą a środowiskiem zewnętrznym. Zaprezentowano i zweryfikowano prawidłowość algorytmu zbieżnego, algorytmu zderzenia cząstek modyfikowanych, który jest stosowany w celu rozwiązania problemu dla jednowarstwowych materiałów włókienniczych w niskich temperaturach. Wyniki symulacji numerycznych problemu dowodzą jego przydatności i skuteczności algorytmu w rozwiązywaniu złożonych problemów optymalizacji. Zachęcające rezultaty wskazują, że powyższy sposób modelowania i algorytm optymalizacji mogą być używane do różnych zastosowań.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 2 (110); 40-43
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of evaluation system of coastline resource in Dafeng
    Autorzy:
    Chen, M.
    Xu, C.
    Chen, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/259978.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    coastline
    Analytic Hierarchy Process
    evaluation system
    Opis:
    Coastline is one type of valuable non-renewable resources. From the perspective of economic theory, it can gather population, promote traffic construction, and then improve the level of international trade. The research object of this paper is the coastline resource in Dafeng area. Firstly, we have a brief summary of the existing coastline evaluation literature, then introduce the location and natural attributes of the coastline resources in Dafeng. Following that, the Analytic Hierarchy Process (AHP) model is used to build the economic evaluation index system based on the characteristics of coastline in Dafeng. Specially, this index system consists of 6 factors, and a total of 41 detailed indicators were chosen including water depth, GDP, etc. On this basis, we use the assignment method to quantify the weight of each index, and calculate the comprehensive score of coastline resource by using the YAAHP software. The final conclusion is as follows: The total score of economic evaluation of coastline resource in Dafeng is 0.87. Therefore, the coastline resource in Dafeng will eventually be constructed a unique coastal economic zone, where the implemented port industrial projects will include shipbuilding, logistics, mechanical processing etc.
    Źródło:
    Polish Maritime Research; 2017, S 2; 181-187
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability and Hopf bifurcation analysis for a Lotka-Volterra predator-prey model with two delays
    Autorzy:
    Xu, C.
    Liao, M.
    He, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/907822.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    opóźnienie
    stabilność
    bifurkacja Hopfa
    predator-prey model
    delay
    stability
    Hopf bifurcation
    Opis:
    In this paper, a two-species Lotka-Volterra predator-prey model with two delays is considered. By analyzing the associated characteristic transcendental equation, the linear stability of the positive equilibrium is investigated and Hopf bifurcation is demonstrated. Some explicit formulae for determining the stability and direction of Hopf bifurcation periodic solutions bifurcating from Hopf bifurcations are obtained by using normal form theory and center manifold theory. Some numerical simulations for supporting the theoretical results are also included.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 1; 97-107
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How Clean is Clean Enough? Maintaining Thermal Protective Clothing Under Field Conditions in the Oil and Gas Sector
    Autorzy:
    Crown, E. M.
    Feng, A.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/90475.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    protective clothing
    decontamination
    flammability
    przemysł wydobywczy
    gaz kopalniany
    odzież ochronna
    izolacja cieplna
    tkaniny na odzież ochronną
    Opis:
    The purpose of this research was to develop practical care procedures to help maintain the protective quality of flame resistant workwear laundered by workers in the field. Based on observed field conditions, experiments were conducted that simulated domestic laundry procedures. The first experiment involved two flame resistant (FR) fabrics, contaminated or not contaminated with oil. Independent variables also included detergent type and laundry pre-treatment. Other laundry parameters were controlled. Results indicated that it is easier to maintain the FR performance of the FR-treated blend than it is for the aramid fabric. It is hypothesized that energy generated by initial ignition of oil on the specimens triggers the FR mechanism of the treatment, which in turn inhibits further combustion. A second experiment using larger specimens and a domestic washing machine also supported the hypothesized mechanism.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 3; 247-254
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An ant-based filtering random-finite-set approach to simultaneous localization and mapping
    Autorzy:
    Li, D.
    Zhu, J.
    Xu, B.
    Lu, M.
    Li, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329854.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    simultaneous localization
    simultaneous mapping
    random finite set
    probability hypothesis density
    ant colony
    lokalizacja jednoczesna
    mapowanie jednoczesne
    algorytm mrówkowy
    Opis:
    Inspired by ant foraging, as well as modeling of the feature map and measurements as random finite sets, a novel formulation in an ant colony framework is proposed to jointly estimate the map and the vehicle trajectory so as to solve a feature-based simultaneous localization and mapping (SLAM) problem. This so-called ant-PHD-SLAM algorithm allows decomposing the recursion for the joint map-trajectory posterior density into a jointly propagated posterior density of the vehicle trajectory and the posterior density of the feature map conditioned on the vehicle trajectory. More specifically, an ant-PHD filter is proposed to jointly estimate the number of map features and their locations, namely, using the powerful search ability and collective cooperation of ants to complete the PHD-SLAM filter time prediction and data update process. Meanwhile, a novel fast moving ant estimator (F-MAE) is utilized to estimate the maneuvering vehicle trajectory. Evaluation and comparison using several numerical examples show a performance improvement over recently reported approaches. Moreover, the experimental results based on the robot operation system (ROS) platform validate the consistency with the results obtained from numerical simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 505-519
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Juvenile-only clusters and behaviour of the Early Cretaceous dinosaur Psittacosaurus
    Autorzy:
    Zhao, Q.
    Benton, M.J.
    Xu, X.
    Sander, P.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21989.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    It has hitherto been hard to prove that any association of juvenile dinosaurs represents original behaviour rather than sedimentary accumulation, and it has been hard also to determine the ages of such juveniles. A previously described specimen, which consists of an “adult” Psittacosaurus with 34 fully articulated juveniles, turns out to be a composite: the “adult” skull probably has been added, and in any case it is below breeding age. Other juvenile-only clusters have been reported, but the best examples that likely reflect behaviour rather than sedimentary accumulation are specimens from the Early Cretaceous Lujiatun beds in NE China, which were entombed beneath pyroclastic flow deposits. A remarkable juvenile-only cluster of Psittacosaurus shows clear evidence of different ages (five 2-year olds and one 3-year old) based on bone histological analysis. These juveniles may have associated together as a close-knit, mixed-age herd either for protection, to enhance their foraging, or as putative helpers at the parental nest.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology
    Autorzy:
    Zhao, Q.
    Benton, M.J.
    Hayashi, S.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/20498.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings. Here we present new data and methods for identifying key growth stages from bone histology. Previous studies on Psittacosaurus lujiatunensis from the Early Cretaceous Jehol Biota of China did not present in-depth analysis of growth patterns. Based on a histological study of 43 thin sections from 17 individuals of this species, we recognize four histological ontogenetic stages, i.e., hatchling, juvenile, sub-adult, and adult, but no fully-grown stage. We estimate life history and longevity from diaphyseal growth line counts and other features of histology. We show that P. lujiatunensis grew fast in early stages (hatchling, juvenile, and subadult), according to the density of vascular canals and the different type of bone tissue; the deposition of parallel fibred bone tissue in the outer cortex of the subadult stage indicates that growth rate was slowing down. We introduce a new graphical method to estimate the occurrence and volumes of vascular canals from thin sections more accurately than current two-dimensional approaches.
    Źródło:
    Acta Palaeontologica Polonica; 2019, 64, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing CNC Manufacturing Interoperability with Step-NC
    Autorzy:
    Rauch, M.
    Laguionie, R.
    Hascoet, J.-Y.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/971256.pdf
    Data publikacji:
    2009
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    STEP-NC
    advanced CNC
    programming CAD/CAM/CNC data interoperability
    Opis:
    Despite substantial improvements CNC manufacturing is still based on dated practices and habits. This is mostly due to the use of ISO 6983 standard (G-codes) combined with vendor specific formats to exchange CAD/CAM/ CNC information. The manufacturing sector is consequently made of a collection of disconnected elements that are difficult to make communicate together. On the contrary STEP-NC approach offers many opportunities to overtake the current situation and rethink CAD/CAM/CNC numerical chains. However, the actual integration of STEP-NC in industrial concerns is quite limited. It is essential to couple this innovative approach with existing equipments. This paper shows how STEP-NC can be an efficient way to reconcile today's interoperability and efficiency demands by introducing the association of two manufacturing platforms: SPAIM, developed at IRCCyN (France), and which controls current industrial machine tools directly from STEP-NC files and IIMP from the University of Auckland (New Zealand), which realizes data portability between heterogeneous proprietary formats, process interoperability. As a result, both approaches lead to improved supervision and integration of the machining systems.
    Źródło:
    Journal of Machine Engineering; 2009, 9, 4; 26-38
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the effect of variable compression ratios performance on opposed piston 2-stroke engine
    Autorzy:
    Alqahtani, A.
    Wyszynski, M. L.
    Mazuro, P.
    Xu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/133658.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    opposed-piston
    AVL BOOST
    VCR
    compression ratio
    numerical simulation
    tłok przeciwbieżny
    stopień sprężania
    symulacja numeryczna
    Opis:
    Numerous skills involving the introduction of (OP) opposed piston engine have been developed in the recent past. Indeed, novel techniques can help to improve the performance of the engine. The aim of this paper is to model and simulate a simple single-cylinder two-stroke opposed-piston engine and minimise fuel consumption and heat loss, using the software programme AVL BOOST™. AVL BOOST is an engine modelling software, which analyses the performance of a modelled single cylinder two-stroke opposed-piston engine by changing desired parameters. In order to meet this aim, experimental results from a unique engine are used to make a comparison with the results obtained from AVL BOOST model. Six combinations of compression ratios (12, 13.5, 15, 16.5, 18 and 19.5) are analysed in this study with the engine speed running at 420 rpm and 1500 rpm. In addition to the compression ratios, the effect of stroke-to-bore (S/B) ratios on OP2S performance is investigated. Various values of S/B ratios, whilst maintaining a constant swept volume, port geometry and combustion timing, and their effect on fuel consumption and heat loss are analysed in this study. A comparison between the two engine speeds with increasing combinations of compression ratios, and the S/B ratios revealed minimal differences in peak pressure, peak temperature, IMEP, ISFC, indicated efficiency and total heat loss. Detailed analyses of these parameters are highlighted in discrete sections of this paper.
    Źródło:
    Combustion Engines; 2017, 56, 4; 97-106
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correction of sample-time error for time-interleaved sampling system using cubic spline interpolation
    Autorzy:
    Qin, G.
    Liu, G.
    Gao, M.
    Fu, X.
    Xu, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221115.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital correction
    sample-time error
    time-interleaved sampling system
    cubic spline interpolation
    Opis:
    Sample-time errors can greatly degrade the dynamic range of a time-interleaved sampling system. In this paper, a novel correction technique employing a cubic spline interpolation is proposed for inter-channel sample-time error compensation. The cubic spline interpolation compensation filter is developed in the form of a finite-impulse response (FIR) filter structure. The correction method of the interpolation compensation filter coefficients is deduced. A 4GS/s two-channel, time-interleaved ADC prototype system has been implemented to evaluate the performance of the technique. The experimental results showed that the correction technique is effective to attenuate the spurious spurs and improve the dynamic performance of the system.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 485-496
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic calibration system for digital-display vibrometers based on machine vision
    Autorzy:
    He, W.
    Xu, G.
    Rong, Z.
    Li, G.
    Liu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221163.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    image recognition
    calibration
    vibration measurement
    machine vision
    automatic testing
    digital-display vibrometer
    Opis:
    Considering the low efficiency during the process of traditional calibration for digital-display vibrometers, an automatic calibration system for vibrometers based on machine vision is developed. First, an automatic vibration control system is established on the basis of a personal computer, and the output of a vibration exciter on which a digital-display vibrometer to be calibrated is installed, is automatically adjusted to vibrate at a preset vibration level and a preset frequency. Then the display of the vibrometer is captured by a digital camera and identified by means of image recognition. According to the vibration level of the exciter measured by a laser interferometer and the recognized display of the vibrometer, the properties of the vibrometer are calculated and output by the computer. Image recognition algorithms for the display of the vibrometer with a high recognition rate are presented, and the recognition for vibrating digits and alternating digits is especially analyzed in detail. Experimental results on the built-up system show that the prposed image recognition methods are very effective and the system could liberate operators from boring and intense calibration work for digital-display vibrometers.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 317-328
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Influence of Silicon Content and Oxygen Concentration on the Oxidation Process of Silicon-Containing Steels
    Autorzy:
    Yuan, Q.
    Xu, G.
    Zhou, M.
    He, B.
    Hu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/352126.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silicone content
    oxygen concentration
    mass gain
    isothermal holding time
    Opis:
    The combined influence of silicon content and oxygen concentration on silicon-containing steels was investigated, via a heating route similar to that applied in the industrial reheating process, using a Simultaneous Thermal Analyzer (STA). Four different oxygen concentrations and three different isothermal holding times were designed. The results show that the effect of silicon on the mass gain depends on the oxygen concentration and the oxidation time. The mass gain of low-silicon steel is greater than that of high-silicon steel at 1260°C in the oxygen concentrations of 1.0 vol.% and 2.0 vol.%, even when the isothermal holding time is 90 minutes. However, there is a critical time point for mass gain in oxygen concentrations ≥3.0 vol.%. The mass gain of lowsilicon steel is greater before and smaller after this critical point. The critical time is deferred with decreasing oxygen concentration.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 445-450
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D morphological reconstruction of the red blood cell based on two phase images
    Autorzy:
    Wang, Y
    Li, Z
    Ji, Y
    Xu, Y
    Bu, M
    Powiązania:
    https://bibliotekanauki.pl/articles/174332.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phase imaging
    red blood cell
    3D morphological reconstruction
    maximum entropy
    Opis:
    As an important component of blood cells, the red blood cell plays a vital role in many diseases such as malaria and so on. Although quantitative phase imaging techniques can be used for homogeneous cellular thickness distribution to obtain ideal results, they cannot achieve 3D morphological distribution. In this paper, a new method is presented to get a 3D morphology image of red blood cell. With this method, only two cellular quantitative phase images obtained from two orthogonal directions are needed as original information. By using the grid method, the sample is divided into many small phase cubes, and then we take a layer’s cubes into calculation so that the 3D problem could be transformed into a 2D problem to elaborate. Then it can be applied to the tomographic imaging combined with the maximum entropy method according to the two orthogonal phase images. This method has been proved by a simulation of red blood cell. The results show that cellular morphological distribution can be achieved in detail very well just based on only two orthogonal phase images.
    Źródło:
    Optica Applicata; 2015, 45, 2; 173-182
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cuttings transport with foam in highly inclined wells at simulated downhole conditions
    Transport urobku wiertniczego przy użyciu piany w silnie nachylonych otworach w symulowanych warunkach w otworze
    Autorzy:
    Xu, J.
    Ozbayoglu, E.
    Miska, S.
    Yu, M.
    Takach, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/220081.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piana
    reologia
    transport urobku wiertniczego
    nachylenie
    drążenie odcinków poziomych
    wysokie ciśnienie
    wysoka temperatura
    foam
    rheology
    cuttings transport
    high inclination
    horizontal drilling
    high pressure high temperature
    Opis:
    Along with the rapidly growing demand and development activities in unconventional resources, is the growth of environmental awareness and concerns among the public. Foam, as an alternative to traditional drilling fluid, is gaining more and more momentum in the drilling industry. Drilling with foam can minimize formation damage, water usage, and drag and torque. Foam also costs less and leaves a much smaller environmental footprint than other commonly used drilling fluids, such as synthetic oil-based fluids, when developing vulnerable formations such as shale gas. As drilling in horizontal and near horizontal sections has become very common, and the need for such sections is increasing, it is very important to understand cuttings transport and hole cleaning issues when drilling with foam in such sections. A team from University of Tulsa Drilling Research Projects (TUDRP) conducted a series of experiments focused on studying the effects of change in hole inclination angle from 90 degrees to 70 degrees on cuttings transport with foam under Elevated Pressure and Elevated Temperature (EPET) conditions. This experimental and theoretical study also includes other influential parameters such as foam quality, foam flow rate, polymer concentration and drill pipe rotary speed. We have observed that there is no significant difference in cuttings concentration and frictional pressure losses as inclination changes from 70 to 90 degrees. Also, an increase in superficial foam velocity reduces cuttings concentration within the annulus. Pipe rotation influences cuttings concentration and frictional pressure losses for low quality foams, but does not have a significant effect on high quality foams. A correlation for the cuttings bed area and a computer simulator are developed for practical design and field applications. The predicted results are compared with experimental results from this study and previous studies. The comparison shows good agreement. We believe that the findings of this paper will help designers with the choice of optimal drilling fluid for drilling horizontal wells in unconventional (shale) gas/oil reservoirs.
    Równolegle ze stale rosnącym zapotrzebowaniem na prowadzenia prac udostępniających w złożach niekonwencjonalnych notuje się wzrost świadomości społecznej odnośnie zagadnień ochrony środowiska. Piana jako alternatywa dla tradycyjnej płuczki wiertniczej nabiera coraz większego znaczenia w górnictwie otworowym. Wiercenie przy użyciu piany pomogą ograniczać zniszczenia formacji geologicznych, redukuje zużycie wody, pozwala na zminimalizowanie oporów ruchu i momentów obrotowych silników. Ponadto, koszty piany są niższe a jej oddziaływanie na środowisko naturalne jest mniej znaczne niż w przypadku typowych płuczek opartych na olejach syntetycznych używanych w trakcie udostępniania trudnych w eksploatacji złóż, np. gazu łupkowego. Wiercenia odcinków poziomych lub prawie poziomych są już szeroko stosowane a zapotrzebowanie na takie odcinki wrasta, ważnym jest właściwe rozpoznanie problemów związanych z transportem urobku wiertniczego i czyszczeniem otworu w trakcie prowadzenia prac wiertniczych na tych odcinkach przy użyciu piany. Zespól badaczy z uniwersytetu w Tulsa zaangażowanych w projekt badawczy w dziedzinie wiertnictwa (TUDRP) przeprowadził serię eksperymentów mających na celu zbadanie wpływu zmiany kąta nachylenia otworu z 90 na 70 stopni na przebieg transportu urobku wiertniczego z wykorzystanie piany w warunkach podwyższonego ciśnienia i podwyższonych temperatur. Badania eksperymentalne i teoretyczne obejmowały także analizę pozostałych parametrów procesu: jakość piany, natężenie przepływu piany, stężenie polimerów, prędkość obrotowa przewodu wiertniczego. Nie stwierdzono znacznych różnic w stężeniu zwiercin ani utraty ciśnienia wskutek tarcia w trakcie zmiany kąta nachylenia z 90 na 70 stopni. Ponadto, dodatkowy wzrost prędkości ruchu piany prowadzi do zmniejszenia stężenia zwiercin w pierścieniu. Prędkość obrotowa przewodu wpływa na stężenie zwiercin i straty ciśnienia wskutek tarcia w przypadku stosowania pian niskiej jakości, efektu tego nie notuje się gdy wykorzystywane są wysokiej jakości piany. Dane z obszaru wiercenia skorelowane zostały z wynikami symulacji komputerowych do wspomagania projektowania i do wykorzystania w terenie. Prognozowane wyniki porównano z wynikami eksperymentów uzyskanymi w tym oraz w poprzednim programie badawczym. Porównanie to wykazuje dużą zgodność wyników. Mamy nadzieję, że wyniki obecnej pracy pomogą inżynierom projektantom w wyborze optymalnej płuczki wiertniczej do wierceń poziomych odcinków otworów przy eksploatacji niekonwencjonalnych złóż ropy i gazu (np. gazu łupkowego).
    Źródło:
    Archives of Mining Sciences; 2013, 58, 2; 481-494
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the start-up of natural bio-film colonization of constructed rapid infiltration system
    Autorzy:
    Xu, W.
    Yang, J.
    Wang, J.
    Jian, Y.
    Tang, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259259.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Constructed Rapid Infiltration System
    start-up of natural bio-film colonization
    removal rate
    COD
    Opis:
    Abstract: this paper studied the start-up of natural bio-film colonization under the conditions where wet-to-dry ratio was 1:6, hydraulic load was 0.8m3/m2·d, and water temperature was 100C-150C, it took 25d in total to become mature, after the success of bio-film colonization, the removal rate of COD and NH4+-N can be stabilized at 80%, and the removal rate of NH4+-N can reach 90% above. The microorganism was divided into the following stages during bio-film colonization:1. Reversible adhesion of cell on the surface of the carrier, 2.Irreversible adhesion of cell on the surface of the carrier, 3.Division of cell adhering to the surface of the carrier and formation of microcolony adhering to the surface of the carrier, 4.Growth of microcolony adhering to the surface of the carrier to be mature bio-film with three-dimensional structure. The process of natural bio-film colonization can be judged comprehensively according to removal rate of NH4+-N and COD, effluent pH as well as color of microbial film.
    Źródło:
    Polish Maritime Research; 2016, S 1; 32-35
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Strain Rate on the Microstructure of Warm-Deformed Ultrafined Medium-Carbon Steel
    Autorzy:
    Yuan, Q.
    Xu, G.
    Liu, S.
    Liu, M.
    Hu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/355659.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warm deformation
    medium-carbon steel
    ultrafine grain
    strain rate
    Fe3C
    Opis:
    In this study, medium-carbon steel was subjected to warm deformation experiments on a Gleeble 3500 thermosimulator machine at temperatures of 550°C and 650°C and strain rates of 0.001 s-1 to 1 s-1. The warm deformation behavior of martensite and the effects of strain rate on the microstructure of ultrafine grained medium-carbon steel were investigated. The precipitation behavior of Fe3C during deformation was analyzed and the results showed that recrystallization occurred at a low strain rate. The average ultrafine ferrite grains of 500 ± 58 nm were fabricated at 550°C and a strain rate of 0.001 s-1. In addition, the size of Fe3C particles in the ferrite grains did not show any apparent change, while that of the Fe3C particles at the grain boundaries was mainly affected by the deformation temperature. The size of Fe3C particles increased with the increasing deformation temperature, while the strain rate had no significant effect on Fe3C particles. Moreover, the grain size of recrystallized ferrite decreased with an increase in the strain rate. The effects of the strain rate on the grain size of recrystallized ferrite depended on the deformation temperature and the strain rate had a prominent effect on the grain size at 550°C deformation temperature. Finally, the deformation resistance apparently decreased at 550°C and strain rate of 1 s-1 due to the maximum adiabatic heating in the material.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1805-1813
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An efficient connected dominating set algorithm in WSNs based on the induced tree of the crossed cube
    Autorzy:
    Zhang, J.
    Xu, L.
    Zhou, S. M.
    Wu, W.
    Ye, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/330830.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wireless sensor networks
    connected dominating set
    induced tree
    approximation algorithm
    crossed cube
    bezprzewodowa sieć sensorowa
    podgrafy indukowane
    algorytm aproksymacyjny
    Opis:
    The connected dominating set (CDS) has become a well-known approach for constructing a virtual backbone in wireless sensor networks. Then traffic can forwarded by the virtual backbone and other nodes turn off their radios to save energy. Furthermore, a smaller CDS incurs fewer interference problems. However, constructing a minimum CDS is an NP-hard problem, and thus most researchers concentrate on how to derive approximate algorithms. In this paper, a novel algorithm based on the induced tree of the crossed cube (ITCC) is presented. The ITCC is to find a maximal independent set (MIS), which is based on building an induced tree of the crossed cube network, and then to connect the MIS nodes to form a CDS. The priority of an induced tree is determined according to a new parameter, the degree of the node in the square of a graph. This paper presents the proof that the ITCC generates a CDS with a lower approximation ratio. Furthermore, it is proved that the cardinality of the induced trees is a Fibonacci sequence, and an upper bound to the number of the dominating set is established. The simulations show that the algorithm provides the smallest CDS size compared with some other traditional algorithms.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 295-309
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft Sensing Method Of LS-SVM Using Temperature Time Series For Gas Flow Measurements
    Autorzy:
    Xu, W.
    Fan, Z.
    Cai, M.
    Shi, Y.
    Tong, X.
    Sun, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221824.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas flow
    soft sensor
    support vector machine (SVM)
    temperature time series
    Opis:
    This paper proposes a soft sensing method of least squares support vector machine (LS-SVM) using temperature time series for gas flow measurements. A heater unit has been installed on the external wall of a pipeline to generate heat pulses. Dynamic temperature signals have been collected upstream of the heater unit. The temperature time series are the main secondary variables of soft sensing technique for estimating the flow rate. A LS-SVM model is proposed to construct a non-linear relation between the flow rate and temperature time series. To select its inputs, parameters of the measurement system are divided into three categories: blind, invalid and secondary variables. Then the kernel function parameters are optimized to improve estimation accuracy. The experiments have been conducted both in the single-pulse and multiple-pulse heating modes. The results show that estimations are acceptable.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 3; 383-392
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A reassessment of the purported ankylosaurian dinosaur Bienosaurus lufengensis from the Lower Lufeng Formation of Yunnan, China
    Autorzy:
    Raven, T.J.
    Barrett, P.M.
    Xu, X.
    Maidment, S.C.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/21669.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    The earliest definitive ornithischian dinosaurs are from the Early Jurassic and are rare components of early dinosaur faunas. The Lower Lufeng Formation (Hettangian–Sinemurian) of Yunnan Province, China, has yielded a diverse Early Jurassic terrestrial vertebrate fauna. This includes several incomplete specimens have been referred to Ornithischia, including the type specimen of the thyreophoran “Tatisaurus” and other generically indeterminate material. The highly fragmentary Lufeng ornithischian Bienosaurus lufengensis was described briefly in 2001 and identified as an ankylosaurian dinosaur. Recent studies have cast doubt on this hypothesis, however, and given that the referral of Bienosaurus to Ankylosauria would result in an extensive ghost-lineage extending between it and the first definitive eurypodans (ankylosaurs + stegosaurs) in the Middle Jurassic, the holotype specimen is re-examined and re-described. We identify Bienosaurus as a probable thyreophoran dinosaur, although the fragmentary nature of the material and the absence of autapomorphies means that the specimen should be regarded as a nomen dubium.
    Źródło:
    Acta Palaeontologica Polonica; 2019, 64, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowania nadprzewodników wysokotemperaturowych do ograniczania prądu
    Applications of HTc superconductors for current limitation
    Autorzy:
    Sosnowski, J.
    Horyń, R.
    Bukowska, E.
    Koblischka, M.R.
    Xu, Y.
    Boreta, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/159126.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    nadprzewodnictwo wysokotemperaturowe
    ograniczniki prądu
    ekran nadprzewodnikowy
    Opis:
    W pracy przedyskutowano zastosowania nadprzewodników wysokotemperaturowych w ogranicznikach prądowych. Przedstawiono konstrukcję modelu rezystywnego, nadprzewodnikowego ogranicznika prądu zwarcia, przeznaczonego do ograniczania prądu o natężeniu rzędu kilkudziesięciu amperów oraz przygotowania do konstrukcji indukcyjnego ogranicznika. Przedstawiono model matematyczny działania ogranicznika. W rezystywnej konstrukcji wykorzystano taśmy nadprzewodnikowe z nadprzewodnika typu Bi:2223 pracujące w otoczeniu ciekłego azotu, podczas gdy przewiduje się wykonać prototyp indukcyjnego ogranicznika w oparciu o ekrany nadprzewodnikowe również z nadprzewodnika opartego na bizmucie. Przedstawiono rezultaty prac technologicznych nad uzyskaniem tych ekranów i analizę dyfraktograficzną otrzymanych proszków bizmutowych typu Bi:2212, spieczonych z polskich surowców. Jakkolwiek uzyskano jednorodny rentgenograficznie materiał typu Bi:2212, to jednak przejście nadprzewodzące zmierzone metodami magnetycznymi było dość rozmyte. Wymaga to kontynuacji prac nad uzyskaniem materiałów o odpowiednich parametrach nadprzewodnikowych.
    Applications of HTc superconductors in the fault current limiters has been discussed. A model of the constructed resistive type superconducting fault current limiter has been presented, which is devoted to current limitation at the level of several dozen of amperes, as well as the preparation for construction of the inductive type superconducting current limiter. The mathematical model of limiters has been discussed. In the resistive model the HTc superconducting Bi:2223 tapes have been used, working in liquid nitrogen environment. It is expected too built a model of inductive fault current limiter in which the active element would be the superconducting shields. Results of the technological work on the design of these superconducting shields, using the commercially available powders are presented. The diffractographic analysis of prepared materials was presented too. Although a homogeneous (from the crystallographic point of view) material of the type Bi:2212 was obtained, the superconducting transition curves were relatively wide. Continuation of the work on the superconducting materials technology process is recessary.
    Źródło:
    Prace Instytutu Elektrotechniki; 2006, 226; 125-147
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review of the Photodecomposition of Some Important Energetic Materials
    Autorzy:
    Sun, Y.
    Shu, Y.
    Xu, T.
    Shui, M.
    Zhao, Z.
    Gu, Y.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/358397.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    photodecomposition mechanisms
    energetic materials
    Opis:
    The photodecomposition mechanisms of energetic materials vary with molecular structure, photodissociation wavelength, the phase of the material, experimental pressure and temperature etc. In this paper, the significant progress on photodecomposition studies of some important energetic materials achieved in recent years is introduced in detail, including nitromethane, DMNA (dimethylnitramine), TATB (1,3,5-triamino-2,4,6-trinitrobenzene), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (1,3,5,7-tetranitro-1,3,5,7- tetrazacycloctane) and CL-20 (2,4,6,8,10,12-hexanitrohexaazaisowurtzitane). The difficulties and prospects of photodecomposition research of energetic materials are also indicated.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 4; 411-423
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning, expression, purification and osteoblasts proliferation activity of sika deer thymosin beta10
    Autorzy:
    Zhao, D.
    Zhao, Y.
    Zhang, H.
    Xu, Z.
    Liu, M.
    Wang, J.
    Bai, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087874.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    affinity chromatography
    cell proliferation
    prokaryotic expression
    sika deer
    thymosin 10
    Źródło:
    Polish Journal of Veterinary Sciences; 2017, 4; 751-758
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System for Calibrating Analogue Merging Units in Absence of Synchronization Signals
    Autorzy:
    Cheng, H.-M.
    Huang, Q.-F.
    Ji, F.
    Xu, Q.
    Liu, J.
    Tian, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/221084.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intelligent substation
    analogue merging unit
    peer-to-peer communication
    calibration system
    synchronization signal
    Opis:
    Synchronization signals are requisite for calibrating electrical measurement devices with digital output when using conventional calibration methods. However, since the signal sampling process of the analogue merging units (MUs) operating in an intelligent substation does not rely on external synchronization signals, accuracy calibration without the use of synchronization signals is of particular importance in order to guarantee the measurement accuracy in practical situations. So far, very little research on calibration systems independent of synchronization signals has been performed. This paper presents a design of the calibration system without dependence on synchronization signals. To verify the feasibility of the proposed design, the designed system and a conventional calibration system have been employed in testing the accuracy of the same analogue MU of a 0.2 accuracy class. The comparison of the test results shows that the differences of ratio errors are below 0.02%, and the maximum difference of phase errors is about 4′. This paper also provides a new efficient and significant calibration method which does not require any external synchronization signals.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 129-138
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Dynamic Pressure and Displacement for the Top Part of Men’s Socks Using the Finite Element Method
    Numeryczna symulacja ciśnienia dynamicznego i przesunięć w górnej części skarpet męskich
    Autorzy:
    Dan, R.
    Dan, M. H.
    Fan, X. R.
    Chen, D. S.
    Shi, Z.
    Zhang, M.
    Xu, L. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/234002.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    top part of socks
    pressure
    displacement
    finite element
    dynamic
    górna część skarpetki
    ciśnienie
    przemieszczenie
    elementy skończone
    dynamika
    Opis:
    Numerical simulation of elastic human body deformation and dynamic pressure and displacement distribution are critical for pressure comfort and optimal design of apparel products. This paper demonstrates an analytical method for simulating dynamic pressure and displacement at the top part of men’s socks using the finite element method (FEM). The dynamic pressure is divided into two parts: the first is pressure with time, and the second is pressure with walking. Pressure with time is set at six periods (maximum 12 h). After measuring pressure values in different periods of time and simulating pressure and displacement distribution using ANSYS software, the tendency of pressure and displacement changes with time at the top part of men’s socks can be obtained. We divided the walking process into four phases to analyse the variation rule of pressure and displacement changes with movement in this research work. Meanwhile the lower leg cross section is divided into four equal regions according to the angle, and dynamic changes in the area shrinkage mass of each region can be calculated, respectively. All these solutions provide a theoretical reference for the optimal design of the top part of men’s socks.
    Numeryczna symulacja elastycznej deformacji ciała ludzkiego, dynamicznego ciśnienia i rozkładu przesunięć są krytycznymi czynnikami komfortu i optymalnych rozwiązań ciśnieniowych wyrobów odzieżowych. Przedstawiono analityczną metodę symulacji ciśnień dynamicznych i przesunięć w górnej części męskich skarpet stosując metodę elementów skończonych. Analizę ciśnień dynamicznych przeprowadzono rozpatrując dwa stadia: zmiany ciśnienia w czasie i zmiany przy ruchu związane z chodzeniem. Na podstawie pomiarów ciśnienia i odkształcenia w określonych przedziałach czasowych określono rozkład odkształceń stosując program ANSYS. Proces chodzenia podzielono na cztery fazy. Wszystkie przeprowadzone badania i rozwiązania dostarczyły informacji dla przedstawienia optymalnego sposobu projektowania męskich skarpet.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 4 (100); 112-117
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of oviraptorid clutches illuminates their unique nesting biology
    Autorzy:
    Yang, T.-R.
    Wiemann, J.
    Xu, L.
    Cheng, Y.-N.
    Wu, X.-C.
    Sander, P.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/19933.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Oviraptorosaurs, a group of non-avian theropod dinosaurs from the Cretaceous of Asia and North America, left behind the most abundant and informative fossil evidence of dinosaur reproductive biology. Previous studies had suggested that oviraptorosaur reproductive biology represents an intermediate stage and exhibited unique modern avian traits. For instance, the adult-associated clutches were predominantly considered as evidence for brooding/thermoregulatory contact incubation (TCI) behaviors, whereas the hypotheses of laying or protection were neglected. Despite numerous oviraptorid egg clutches uncovered from China and Mongolia, their nest architecture and clutch arrangement were rarely investigated in detail. Here we present a comprehensive reconstruction of an oviraptorid clutch based on five new oviraptorid clutches from Jiangxi Province, China. A detailed examination of the new clutches reveals a partially-open oviraptorid nest that contains 3–4 rings of paired eggs (more than 15 pairs total) whose blunt end points toward the center devoid of eggs at an angle of 35–40°. Our detailed three-dimensional reconstruction indicates that the oviraptorid clutch has a unique architecture unknown from extant bird clutches, implying an apomorphic nesting mode. Such a unique nest architecture further contradicts the TCI hypothesis in oviraptorids, hindering sufficient heat transfer to the inner (lower) ring(s) of eggs. Moreover, the size of the new oviraptorid clutches (>30 eggs) is significantly larger than that of the adult-associated clutches (<22 eggs), raising the alternative hypothesis that the adult-associated clutches were uncompleted. This clue thus supports the hypothesis that the clutch-associated oviraptorid adults possibly represent females after an oviposition before a catastrophic sandstorm/flooding burial.
    Źródło:
    Acta Palaeontologica Polonica; 2019, 64, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability control of propeller Autonomous Underwater Vehicle based on combined sections method
    Autorzy:
    Qi, D.
    Feng, J.
    Liu, A.
    Hu, J.
    Xu, H.
    Li, Y.
    Ashraf, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/259119.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    propeller AUV
    dynamic model
    stability control
    simulation
    Opis:
    Learning from the motion principle of quadrotor, a symmetric propeller AUV, which has small size and low velocity is designed. Compared with the AUV equipped with rudders, it has better maneuverability and manipulation at low velocity. According to the Newton-Euler method, the 6 DOF kinematic model and dynamic model of the propeller AUV are established. A stability controller that consists of 3 different PID controllers is designed. It makes the depth and attitude angle as trigger conditions, and the relevant controller is chosen in different moving process. The simulation experiments simulate ideal motion state and disturbed motion state, and experiments results show that the stability controller based on combined sections method can make the best of mature technology of PID, and meet the control requirements in different stages. It has a higher respond speed and accuracy, improving the stability of the propeller AUV under the disturbance of complex ocean currents.
    Źródło:
    Polish Maritime Research; 2015, S 1; 157-162
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic analysis of embedded chains in mooring line for fish cage system
    Autorzy:
    Hou, H. M.
    Dong, G. H.
    Xu, T. J.
    Zhao, Y. P.
    Bi, C. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/259892.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    embedded chains
    soil resistance
    parameter sensitivity
    dynamic analysis
    Opis:
    Investigation of the embedded chains in soil starts to play an important role in understanding the structural performance of mooring system, when the embedded anchors will be employed to sustain large loads with the gradually growth of installation depth of offshore aquaculture farm. The aim of this study is to investigate the dynamic response of mooring line considering the influence of embedded chains in clay soil for net cage system. Lumped-mass method is used to establish the numerical model for evaluating the performance of mooring line with embedded chains. To validate the numerical model, comparisons of numerical results with the analytical formulas and the experimental data are conducted. A good agreement of the profile and the tension response is obtained. Then, the effect of embedded chains on the static and dynamic response of mooring line is evaluated, and the dynamic behavior of mooring system considering embedded chains for net cage system is investigated. The results indicate that the soil resistance on embedded chains should be included to predict the mooring line development and the load on the embedded anchors in the numerical simulations. An appropriate safety factor should be included if employing the simplified model Case C at the initial design phase. And the effect of embedded chains on the holding capacity of embedded anchors in single-point mooring system for single net cage cannot be negligible during the design and operation phases. Consequently, it is profound to take into account the interaction of embedded chains and soil for accurately predicting the reliability of mooring system for fish cage.
    Źródło:
    Polish Maritime Research; 2018, 4; 83-97
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Induction of immune responses in sheep by vaccination with liposome-entrapped DNA complexes encoding Toxoplasma gondii MIC3 gene
    Autorzy:
    Hiszczynska-Sawicka, E.
    Li, H.
    Xu, J.B.
    Akhtar, M.
    Holec-Gasior, L.
    Kur, J.
    Bickerstaffe, R.
    Stankiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/30828.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    immune response
    sheep
    vaccination
    Toxoplasma gondii
    parasite
    protozoan parasite
    pregnancy
    MIC3 gene
    MIC3 antigen
    Opis:
    Toxoplasma gondii is a parasite that has been extensively studied due to its medical and veterinary importance in terminating pregnancies. Consequently, a satisfactory vaccine is required to control its adverse effects on pregnant animals. The microneme protein, MIC3, is a major adhesion protein that binds to the surface of host cells and parasites, and is therefore a potential vaccine against T. gondii. The viability of MIC3 as a vaccine is investigated in this study. Sheep were injected twice, intramuscularly, with plasmids containing DNA encoding for the mature form of MIC3 protein formulated into liposomes. Control sheep were injected with an empty vector or received no injections. The injection of sheep with DNA plasmids encoding for MIC3 elicited an immune response after the first and second injections as indicated by antibody responses and the production of IFN-γ. The immune response, as measured by the IgG2 and IgG1 serum levels, was boosted after the injection of the MIC3 DNA vaccine together with high anti-MIC3 antibodies. The results demonstrate that the intramuscular injection of sheep with a plasmid containing DNA coding for MIC3 protein induces a significant and effective immune response against T. gondii.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification, evaluation, and application of the genomic-SSR loci in ramie
    Autorzy:
    Luan, M.-B.
    Yang, Z.-M.
    Zhu, J.-J.
    Deng, X.
    Liu, C.-C.
    Wang, X.-F.
    Xu, Y.
    Sun, Z.-M.
    Chen, J.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/57981.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    To provide a theoretical and practical foundation for ramie genetic analysis, simple sequence repeats (SSRs) were identified in the ramie genome and employed in this study. From the 115 369 sequences of a specific-locus amplified fragment library, a type of reduced representation library obtained by high-throughput sequencing, we identified 4774 sequences containing 5064 SSR motifs. SSRs of ramie included repeat motifs with lengths of 1 to 6 nucleotides, and the abundance of each motif type varied greatly. We found that mononucleotide, dinucleotide, and trinucleotide repeat motifs were the most prevalent (95.91%). A total of 98 distinct motif types were detected in the genomic-SSRs of ramie. Of them, The A/T mononucleotide motif was the most abundant, accounting for 41.45% of motifs, followed by AT/TA, accounting for 20.30%. The number of alleles per locus in 31 polymorphic microsatellite loci ranged from 2 to 7, and observed and expected heterozygosities ranged from 0.04 to 1.00 and 0.04 to 0.83, respectively. Furthermore, molecular identity cards (IDs) of the germplasms were constructed employing the ID Analysis 3.0 software. In the current study, the 26 germplasms of ramie can be distinguished by a combination of five SSR primers including Ibg5-5, Ibg3-210, Ibg1-11, Ibg6-468, and Ibg6-481. The allele polymorphisms produced by all SSR primers were used to analyze genetic relationships among the germplasms. The similarity coefficients ranged from 0.41 to 0.88. We found that these 26 germplasms were clustered into five categories using UPGMA, with poor correlation between germplasm and geographical distribution. Our study is the first large-scale SSR identification from ramie genomic sequences. We have further studied the SSR distribution pattern in the ramie genome, and proposed that it is possible to develop SSR loci from genomic data for population genetics studies, linkage mapping, quantitative trait locus mapping, cultivar fingerprinting, and as genetic diversity studies.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)
    Autorzy:
    Zhang, M.
    Xu, X.
    Zhu, X.
    Jin, X.
    Bao, H.
    Dugeer, S.
    Du, C.
    Cao, G.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087780.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ghrelin
    reindeer (Rangifer tarandus)
    cDNA cloning
    structural characterization
    tissue expression
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 55-64
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bacterial communities in PM2.5 and PM10 in broiler houses at different broiler growth stages in spring
    Autorzy:
    Zhang, J.
    Li, Y.
    Xu, E.
    Jiang, L.
    Tang, J.
    Li, M.
    Zhao, X.
    Chen, G.
    Zhu, H.
    Yu, X.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087465.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bacterial communities
    broilers
    high-throughput sequencing
    particulate matter
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 495-504
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Report on the archaeological survey at Gebelein in the 2014, 2015 and 2016 seasons
    Autorzy:
    Ejsmond, Wojciech
    Chyla, Julia M.
    Witkowski, Piotr
    Takács, Dániel
    Wieczorek, Dawid F.
    Xu-Nan, Lawrence
    Oeters, Vincent
    Kuronuma, Taichi
    Grylak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1684198.pdf
    Data publikacji:
    2018-07-09
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    Gebelein
    mobile GIS
    geophysical prospection
    archaeological survey
    epigraphic survey
    satellite imagery
    RTI
    decorrelation
    Opis:
    All periods of Egyptian history are represented at Gebelein and it encompasses many kinds of archaeological site found in the Nile valley (that is, cemeteries, settlements, fortifications, temples, rock quarries etc.). The area was a significant centre in the history of ancient Egypt, but its exact role and the reasons for its importance still awaits explanation. That is why the Gebelein Archaeological Project was initiated. The field survey of Gebelein, which started in 2014, aims to recognise the topography of the area and the degree of destruction of the sites and to locate archaeological remains as well as to determine their interpretation and dating. This report outlines the results of work conducted during seasons 2014, 2015 and 2016, which encompassed the archaeological and epigraphic field surveys, geophysical prospection as well as work conducted in the rock-cut chapel of Hathor.
    Źródło:
    Polish Archaeology in the Mediterranean; 2017, 26(1); 239-268
    1234-5415
    Pojawia się w:
    Polish Archaeology in the Mediterranean
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography
    Autorzy:
    Xu, X.
    Upchurch, P.
    Ma, Q.
    Pittman, M.
    Choiniere, J.
    Sullivan, C.
    Hone, D.W.E.
    Tan, Q.
    Tan, L.
    Xiao, D.
    Han, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/20629.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    osteology
    Cretaceous
    Late Cretaceous
    alvarezsauroid
    Linhenykus monodactylus
    China
    biogeography
    Dinosauria
    Theropoda
    Parvicursorinae
    Treefitte
    dispersal
    vicariance
    sympatry
    Wulansuhai Formation
    Inner Mongolia
    Opis:
    The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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