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    Wyświetlanie 1-52 z 52
    Tytuł:
    A contribution to the knowledge of a Chinese endemic genus Stilpnodiscus Mollendorff, 1899 (Gastropoda: Pulmonata: Bradybaenidae), with a description of two new species
    Autorzy:
    Wu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/83855.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Opis:
    Three species of a Chinese endemic genus Stilpnodiscus Möllendorff, two of them (S. moellendorffi and S. yeni) new, are conchologically and anatomically examined, based on material from Gansu and Sichuan Provinces, W China. Their genitalia are described in detail; a finger-shaped structure of unknown function, found in S. moellendorffi sp. n., is unique among bradybaenids. Definition of the genus is discussed. Principal component analysis of seven metric characters and two coefficients reveals a compatibility of conchological features between the two new species. Their conchological resemblance, combined with the great dissimilarity of the dart sac and sympatric distribution, suggests a particular speciation process.
    Źródło:
    Folia Malacologica; 2001, 09, 2
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Farm animal breeding of genetic resources for young farmers in Taiwan
    Hodowla zwierząt gospodarskich z zasobów genetycznych dla młodych rolników na Tajwanie
    Autorzy:
    Wu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/3132732.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Taiwan
    farm animal
    livestock
    poultry
    animal breeding
    farm animal genetic resources
    conservation
    selection
    Źródło:
    Acta Scientiarum Polonorum. Zootechnica; 2021, 20, 3; 97-104
    1644-0714
    Pojawia się w:
    Acta Scientiarum Polonorum. Zootechnica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A taxonomic note on Pseudiberus ancey, 1887 (Gastropoda: pulmonata: Bradybaenidae)
    Autorzy:
    Wu, M.
    Qi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/83061.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Opis:
    Two subgenera of Pseudiberus Ancey, Pseudiberus s. str. Ancey and Platypetasus Pilsbry, are synonymised, based on the fact that the snails cannot be distinguished based on shell or genital characters, and their distribution ranges largely overlap. Examining the type specimens resulted in synonymisation of Platypetasus cixianensis Chen et Zhang, 2000 and Pseudiberus chentingensis (Yen, 1935). Possible reasons for the conchological differences between the Cixian County population and the Zhengding population ofthe species are discussed.
    Źródło:
    Folia Malacologica; 2006, 14, 1
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical Assessment of Automotive Mufflers Using FEM, Neural Networks, and a Genetic Algorithm
    Autorzy:
    Chang, Y.-C.
    Chiu, M.-C.
    Wu, M.-R.
    Powiązania:
    https://bibliotekanauki.pl/articles/177901.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustics
    finite element method
    genetic algorithm
    muffler optimization
    polynomial neural network model
    Opis:
    In order to enhance the acoustical performance of a traditional straight-path automobile muffler, a multi-chamber muffler having reverse paths is presented. Here, the muffler is composed of two internally parallel/extended tubes and one internally extended outlet. In addition, to prevent noise transmission from the muffler’s casing, the muffler’s shell is also lined with sound absorbing material. Because the geometry of an automotive muffler is complicated, using an analytic method to predict a muffler’s acoustical performance is difficult; therefore, COMSOL, a finite element analysis software, is adopted to estimate the automotive muffler’s sound transmission loss. However, optimizing the shape of a complicated muffler using an optimizer linked to the Finite Element Method (FEM) is time-consuming. Therefore, in order to facilitate the muffler’s optimization, a simplified mathematical model used as an objective function (or fitness function) during the optimization process is presented. Here, the objective function can be established by using Artificial Neural Networks (ANNs) in conjunction with the muffler’s design parameters and related TLs (simulated by FEM). With this, the muffler’s optimization can proceed by linking the objective function to an optimizer, a Genetic Algorithm (GA). Consequently, the discharged muffler which is optimally shaped will improve the automotive exhaust noise.
    Źródło:
    Archives of Acoustics; 2018, 43, 3; 517-529
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High drilling methane drainage in fracturing zones formed by water injection into boreholes
    Odprowadzania metanu metodą odwiertów dokonywanych w strefie szczelin powstałych wskutek wprowadzania wody do otworów
    Autorzy:
    Wang, G.
    Huang, W.
    Sun, L.
    Wu, M.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/220166.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odwierty
    odprowadzenie metanu
    wtrysk wody
    szczelinowanie
    odkształcenia
    high drilling
    methane drainage
    water injection
    fracturing zones
    strain
    Opis:
    Methane drainage method should be used before coal mining of many modern collieries because venti lation air methane is in sufficient to keep methane level within regulation values. The technology of high drilling methane drainage (HDMD) has been used for methane drainage although its effect is not very stable due to parameter design. The height of the fracturing zones is determined mostly according to empirical formula, on-site observation and numerical simulation analysis. In this paper, a method was introduced for determining the height of the air f ract uring zones (AFZs) based on its high similarity to the characteristics of Fracturing zones and the relationship between the height of Fracturing zones and the strain of overl ying rock strata. The application of water injection in both Shuangdingshan and Dongrong collieries found that the theoretically calculated the height of the Fracturing zones was approximately equal to the measured one in field tests within a permissible error of less than 5%, proving that the method is feasible. Based on the designed drainage parameters, the u tilization of HDMD technology in the collieries mentioned above found that the methane concentrations in both tail gate and upper corner were controlled in the ranges of 0.17% to 0.32% and 0.26% to 0.84%, respectively. These results showed that the water injection verified HDMD in Fracturing zones could effectively solve the problem of metha ne overrun and also verified the accuracy and reliability of its related theory.
    Przed rozpoczęciem wydobycia węgla w wielu obecnie eksploatowanych kopalniach wskazane jest odprowadzenie metanu, ponieważ stosowane systemy wentylacji powietrza są niewystarczające aby utrzymać stężenia metanu na dopuszczalnym poziomie. Technologia odprowadzania metanu metodą odwiertów prowadzonych na różnej wysokości (HDMD) wykorzystywana jest w tym celu, choć jej wyniki nie zawsze są stabilne ze względu na konieczność doboru parametrów obliczeniowych. Wysokość strefy szczelinowania określa się zazwyczaj empirycznie, na podstawie obserwacji w terenie oraz drogą symulacji numerycznych. W pracy tej określono wysokość strefy wykonania szczelin w oparciu o podobieństwo do charakterystyk Strefy szczelinowania oraz o analizę odkształceń warstw nadkładu. Zastosowano wtrysk wody w kopalniach Shuangdingshan i Dongrong i stwierdzono, że teoretycznie obliczona wysokość stref szczelinowania była w przybliżeniu równa wysokości zmierzonej empirycznie w trakcie badań terenowych, z dopuszczalnym poziomem błędu poniżej 5%, co wskazuje na możliwość zastosowania metody. W oparciu o parametry obliczeniowe stwierdzono, że zastosowanie metody HDMD w wyżej wymienionych kopalniach spowodowało, że stężenia metanu rejestrowane w chodniku nadścianowym i górnych narożach utrzymywały się odpowiednio na poziomie 0.17%, 0.32% i 0.26%-0.84%. Wyniki te pokazują, że wtrysk wody w strefie szczelin pomaga skutecznie rozwiązać problem obecności zbyt wysokich ilości metanu, ponadto potwierdza dokładność i wiarygodność teorii na której metoda jest oparta.
    Źródło:
    Archives of Mining Sciences; 2016, 61, 1; 137-156
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariate statistical analysis of water quality and phytoplankton characteristics in Daya Bay, China, from 1999 to 2002
    Autorzy:
    Wang, Y.S.
    Lou, Z.P.
    Sun, C.C.
    Wu, M.L.
    Han, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/48049.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    South China Sea
    water quality
    China
    phytoplankton
    Daya Bay
    multivariate statistical analysis
    Opis:
    This study analyzed seasonal physicochemical and phytoplankton data collected at 12 marine monitoring stations in Daya Bay from 1999 to 2002. Cluster analysis based on water quality and phytoplankton parameters measured at the 12 stations could be grouped into three clusters: cluster I – stations S1,S2 , S7 and S11 in the southern part and the north-eastern part of Daya Bay; cluster II – stations S5, S6,S9 ,S1 0 and S12 in the central and north-eastern parts of Daya Bay; cluster III – stations S3,S 4 and S8 in the cage culture areas in the south-western part of Daya Bay and in the north-western part of the Bay near Aotou harbor. Bivariate correlations between phytoplankton density and the major physical and nutrient factors were calculated for all stations. Factor analysis shows that there were high positive loadings of pH,T IN and the ratio of TIN to PO4-P in the three clusters, which indicates that all the stations in the three clusters were primarily grouped according to their respective nutrient conditions.
    Źródło:
    Oceanologia; 2006, 48, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signature of Hot Phonons in Reliability of Nitride Transistors and Signal Delay
    Autorzy:
    Matulionis, A.
    Liberis, J.
    Matulionienė, I.
    Šermukšnis, E.
    Leach, J.
    Wu, M.
    Ni, X.
    Morkoç, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506173.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.70.+m
    73.50.Fq
    73.61.Ey
    Opis:
    Lifetime of non-equilibrium (hot) phonons in biased GaN heterostructures with two-dimensional electron gas channels was estimated from hot-electron fluctuations. Dependence of the lifetime on the electron density is not monotonous - the resonance-type fastest decay serves as a signature of hot phonons. The signature is resolved in nitride heterostructure field effect transistors when the gate voltage is used to change the channel electron density. The transistor cut-off frequency decreases on both sides of the resonance in agreement with the enhanced electron scattering caused by longer hot-phonon lifetimes. The signature is also noted in device reliability experiment: the enhanced temperature of hot phonons, possibly, triggers formation of new defects and accelerates device degradation.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 225-227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using chemometrics to identify water quality in Daya Bay, China
    Autorzy:
    Wu, M.-L.
    Wang, Y.-S.
    Sun, C.-C.
    Wang, H.
    Lou, Z.-P.
    Dong, J.-D.
    Powiązania:
    https://bibliotekanauki.pl/articles/49096.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    robust principal component analysis
    water quality
    chemometrics
    China
    cluster analysis
    Daya Bay
    Opis:
    In this paper, chemometric approaches based on cluster analysis, classical and robust principal component analysis were employed to identify water quality in Daya Bay (DYB), China. The results show that these approaches divided water quality in DYB into two groups: stations S3, S8, S10 and S11 belong to cluster A, which lie in Dapeng Cove, Aotou Harbor and the north-eastern part of DYB, where water quality is related mainly to anthropogenic activities. The other stations belong to cluster B, which lie in the southern, central and eastern parts of DYB, where the quality is related mainly to water exchange with the South China Sea. Cluster analysis yields good results as a first exploratory method for evaluating spatial difference, but it fails to demonstrate the relationship between variables and environmental quality on the one hand and the untreated data on the other. However, with the aid of suitable chemometric approaches, the relationship between samples or variables can be investigated. Classical and robust principal component analysis can provide a visual aid for identifying the water environment in DYB, and then extracting specific information about relationships between variables and spatial variation trends in water quality.
    Źródło:
    Oceanologia; 2009, 51, 2; 217-232
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coating of LiBH4 and Its Effect on the Decomposition of RDX and AP
    Autorzy:
    Ding, X.
    Shu, Y.
    Chen, Z.
    Liu, N.
    Gou, B.
    Zhang, J.
    Wu, M.
    Xie, G.
    Dang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358086.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    coating
    hydride
    additive
    hygroscopicity
    DSC
    Opis:
    The novel fuel additive LiBH4 was introduced as an energetic component for its outstanding hydrogen content, perfect burning performance and high reactivity. In order to limit the hygroscopicity and to improve the stability in the air, LiBH4 was coated on the surface with wax and polyester carbonate. The final product was characterized by scanning electron microscopy (SEM), X-ray photoelectron energy spectroscopy (XPS) and Raman spectroscopy, while the stability in air was investigated by regular checking of variations in weight. The results show that a uniform coating layer was formed on the surface of the LiBH4, and the coverage was estimated from the boron content as approximately 82%. A healing effect was confirmed on defective surfaces exposed to air; the coating layer improves the relative stability by 50.7%. Furthermore, LiBH4 as an additive to promote the thermal decomposition of 1,3,5-trinitro-1,3,5-trazinane (RDX) and ammonium perchlorate (AP) was explored by differential scanning calorimetry (DSC), in which the catalytic effects of pure LiBH4 and coated LiBH4 were compared, and indicated that the coating does not decrease the reactivity of LiBH4. It is suggested that surface coating with some inert materials is a simple and effective method for improving the storage and performance of LiBH4, while ensuring its reactivity.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 134-151
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endotoxin and beta-[1,3]-glucan levels in automobiles: a pilot study
    Autorzy:
    Wu, F F -S
    Wu, M.-W.
    Chang, C.-F.
    Lai, S.-M.
    Pierse, N.
    Crane, J.
    Siebers, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/49259.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    endotoxin
    glucan
    beta-[1,3]-glucan level
    respiratory health
    non-occupational source
    indoor environment
    automobile
    asthmatic patient
    respiratory symptom
    exposure
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 327-330
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Demonstration of a new indicator for studying upwelling in the Northern South China Sea
    Autorzy:
    Lin, L.
    Wang, Y.-S.
    Sun, C.-C.
    Li, N.
    Wang, H.
    Mitchell, B.G.
    Wu, M.-L.
    Song, H.
    Wu, J.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/48889.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    China Sea
    cluster analysis
    multivariate statistical analysis
    principal component analysis
    remote sensing
    satellite monitoring
    sea surface temperature
    silicate
    spatial distribution
    upwelling
    Opis:
    In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fault diagnosis method for substation grounding grid based on the square-wave frequency domain model
    Autorzy:
    Zhang, P.-H.
    He, J.-J.
    Zhang, D.-D.
    Wu, L.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221635.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    square-wave
    frequency characteristics
    grounding grid
    fault diagnosis
    Opis:
    Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the grounding system is constructed by analyzing the frequency characteristics of the soil and the grounding conductors into which two different frequency square-wave sources are injected. By analyzing and comparing the corresponding information of the surface potentials of the output signals, the faults of the grounding grid can be diagnosed and located. Our method is verified by software simulation, scale model experiments and field experiments.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 63-71
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tetragonal or hexagonal symmetry in modeling of failure criteria for transversely isotropic materials
    Autorzy:
    Ganczarski, A.
    Adamski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386235.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    transverse isotropy
    tetragonal and hexagonal symmetry
    Tsai-Wu criterion
    izotropia poprzeczna
    symetria
    kryteria Tsai-Wu
    Opis:
    Present work deals with modeling of failure criteria for transversely isotropic materials. Analysis comprises two classes of symmetry: Tsai-Wu tetragonal and new Tsai-Wu based hexagonal. Detail analysis of both classes of symmetry with respect to their advantages as well as limitations is presented. Finally, simple comparison of differences between limit curves corresponding to cross sections by planes of transverse isotropy, orthotropy and shear plane is done.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 3; 125-128
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrafast Phenomena in Freestanding LT-GaAs Devices
    Autorzy:
    Marso, M.
    Mikulics, M.
    Adam, R.
    Wu, S. Wu.
    Zheng, X.
    Camara, I.
    Siebe, F.
    Förster, A.
    Güsten, R.
    Kordoš, P.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041640.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    72.40.+w
    78.30.Fs
    85.60.-q
    85.60.Gz
    Opis:
    We report on the fabrication and high-frequency performance of our photodetectors and photomixers based on freestanding low-temperature-grown GaAs. The MBE-grown low-temperature GaAs layers are lifted from the native GaAs substrate and transferred on top of variety of host substrates. The freestanding devices exhibit breakdown electrical fields above 200 kV/cm and dark currents below 3×10$\text{}^{-7}$ A at 100 V bias. Device photoresponse shows 0.55 ps wide electrical transients with voltage amplitudes up to 1.3 V, measured using an electro-optical sampling technique with 100 fs wide laser pulses. Photomixing experiments at 460 GHz yield a 9 times higher output power for the freestanding device on Si/SiO$\text{}_{2}$ host substrate compared to the native substrate.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 109-117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of the Pulsed Laser Deposited LaSrCuO Films
    Autorzy:
    Cieplak, M. Z.
    Abal'oshev, A.
    Zaytseva, I.
    Berkowski, M.
    Guha, S.
    Wu, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046751.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    68.55.Jk
    68.37.Ps
    Opis:
    The X-ray diffraction and atomic force microscopy are used to examine the microstructure of La$\text{}_{1.85}$Sr$\text{}_{0.15}$CuO$\text{}_{4}$ films grown by pulsed laser deposition on LaSrAlO$\text{}_{4}$ substrates. The films grow with different degrees of built-in strain, ranging from a large compressive to a large tensile in-plain strain. The tensile strain cannot be attributed to a substrate-related strain. The possible origins of the tensile strain are discussed.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 573-576
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    Common mycelium networks with Paraglomus occultum induce better plant growth and signal substance changes between trifoliate orange seedlings
    Autorzy:
    Zhang, Y.-C.
    Xie, M.-M.
    Feng, H.-D.
    Zhou, M.
    Zhang, Z.Z.
    Liu, C.-Y.
    Wu, Q.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11877054.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Mycorrhizal mycelium can simultaneously colonize two and more neighboring plants to form common mycelium network (CMNs), whereas the information regarding CMN effects on endogenous signal substances is limited. In this study, a rootbox was separated by 37- or 0.45-μm mesh to establish donor chamber (the presence of roots and hyphae) and receptor (hyphae presented or not, free of roots) chamber, where an arbuscular mycorrhizal (AM) fungus Paraglomus occultum was inoculated into trifoliate orange seedlings of donor chamber to illustrate the underground communications of signal substances by CMNs. Mycorrhizal colonization resulted in better plant growth performance and greater root morphology in donor and receptor plants. AM inoculation increased significantly the root nitric oxide (NO) and calmodulin (CaM) levels of donor plants, regardless of 37- and 0.45-μm mesh, and subsequent CMNs induced higher root NO and CaM levels in receptor plants. Mycorrhizal colonization did not produce significant changes in root zeatin riboside (ZR) levels of donor plants, but CMN hyphae modulated lower root ZR levels of receptor plants. Mycorrhizal inoculation and subsequent CMN hyphae induced lower root gibberellin levels of donor and receptor plants, and only CMN hyphae produced lower root methyl jasmonate concentrations of receptor plants. Our results first reveal the underground communication of CaM, NO, and ZR by CMNs with P. occultum between trifoliate orange seedlings.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 6; 95-104
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ergonomics Hazards Analysis of Linemen’s Power Line Fixing Work in China
    Autorzy:
    Yu, M.
    Sun, L.
    Du, J.
    Wu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/91236.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    ergonomics
    hazards
    linemen
    musculoskeletal disorders
    Opis:
    This study used qualitative and quantitative methods, such as OWAS (Ovako working posture analysis system) and behavior observation, to analyze musculoskeletal disorder (MSD) risk factors of power line fixing work in China. Video-based sampling was used to record and analyze the frequency and posture of on-pole activities. Those key subtasks showed ergonomics characteristics of on-pole fixing tasks. Insulator-fixing was the longest subtask (33% of total working time). Bar-installing was the second longest (26% of total working time). It was evident that bar-installing and insulator-fixing were full of hazardous risks. The action categories of the 2 subtasks were higher than of the other ones. The 2 subtasks were also time-consuming, difficult and induced MSDs. Assistant linemen faced more hazardous factors than chief linemen.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 3; 309-317
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the EPR Parameters of $KMgF_3$:$Cr^{+}$
    Autorzy:
    Kuang, M.
    Wu, S.
    Hu, X.
    Li, G.
    Zu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365348.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    76.30.Fc
    Opis:
    The electron paramagnetic resonance parameters (i.e., g factor, hyperfine structure constant and superhyperfine parameters) of $KMgF_3$:$Cr^{+}$ are theoretically investigated from the perturbation formulae of these parameters for an octahedral $3 d^5$ cluster. As for the calculations of g factor and hyperfine structure constant, both the contributions from the crystal-field and charge transfer mechanisms are included based on the cluster approach. The metal to ligand charge transfer contribution to the g-shift Δg ( ≈ g-2.0023) is the same (negative) in sign and much larger in magnitude as compared to the crystal-field one. The conventional argument that the charge transfer contributions to zero-field splittings are negligible for $3 d^5$ ions in fluorides is no longer suitable for Δg analysis of $KMgF_3$:$Cr^{+}$ due to the dominant second-order charge transfer perturbation term. The charge transfer contribution to hyperfine structure constant exhibits the same sign and about 4% of the crystal-field one. The unpaired spin densities of the fluorine 2s, 2pσ and 2pπ orbitals are quantitatively acquired from the relationships with the relevant molecular orbital coefficients using the uniform model. The present treatments are superior to the previous calculations of directly fitting the experimental superhyperfine parameters.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1224-1228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A field trial of recombinant Schistosoma japonicum paramyosin as a potential vaccine in naturally-infected water buffaloes
    Autorzy:
    Jiz II, M.A.L.
    Mingala, C.N.
    Lopez, I.F.M.
    Chua, M.
    Gabonada Jr., F.G.
    Acosta, L.P.
    Wu, H.
    Kurtis, J.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/6326.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    The overall aims of this project are to assess the safety and immunogenicity of the Schistosoma japonicum vaccine paramyosin among water buffaloes residing in endemic areas. The study was conducted in four villages in Leyte, the Philippines, an area highly endemic for schistosomiasis japonica. One hundred and fifteen (N=115) animals provided baseline stool samples for coprologic examination, with preliminary results using FLOTAC showing a 10% prevalence of schistosomiasis. Forty-nine (N=49) animals consented to treatment with 25 mg/kg Praziquantel, and 40, 36 and 32 animals consented to the first, second and third dose of the paramyosin vaccine, respectively. The safety trial involved the first 20 animals and included skin testing, vaccination, anaphylaxis monitoring, as well as hematology and serum chemistry analysis. Skin tests revealed that only three out of 20 animals exhibited redness at the injection site, with none greater than 1 cm. None of the animals exhibited anaphylaxis, and all hematology and serum chemistry markers were within normal range or were similar to pre-vaccination levels. None of the 40 animals administered with the first dose exhibited anaphylaxis, nor any of the subsequent vaccine doses. Immunogenicity assessment of sera collected prior to every vaccination and one month after the last dose showed that the paramyosin vaccine induced robust antibody responses to all animals, as assessed by ELISA. The cytokine levels of whole blood culture supernatants will be further assessed. Our findings demonstrate that the S. japonicum paramyosin vaccine is a safe, well-tolerated and immunogenic treatment among water buffalos residing in endemic areas.
    Źródło:
    Annals of Parasitology; 2016, 62, 4
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Spectroscopy of $LiFePO_4$ and $Li_3V_2(PO_4)_3$ Prepared as Cathode Materials
    Autorzy:
    Ziółkowska, D.
    Korona, K.
    Kamińska, M.
    Grzanka, E.
    Andrzejczuk, M.
    Wu, S.
    Chen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493017.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Hv
    82.80.Gk
    82.47.Aa
    Opis:
    Structure of samples of lithium iron vanadium phosphates of different compositions were investigated by X-rays, electron microscopy and Raman spectroscopy. The investigated salts were mainly of olivine-like and NASICON-like structures. The X-ray diffraction and the Raman scattering show different crystalline structures, which is probably caused by difference between cores of the crystallites (probed by X-rays) and their shells (probed by the Raman scattering). Most of the Raman spectra were identified with previously published data, however in the samples with high vanadium concentration we have observed new, not reported earlier modes at 835 $cm^{-1}$ and 877 $cm^{-1}$, that we identified as oscillations related to $V_2O_7^{4-}$ or $VO_4^{3-}$ anions.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 973-975
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of sodium sulfide waste water recycling on the separation of chalcopyrite and molybdenite
    Autorzy:
    Wu, D.
    Peng, H.
    Abdalla, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110657.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vanadium slag
    low pressure leaching
    liquid phase oxidation
    kinetics
    Opis:
    The effect of sodium sulfide waste water recycling on the separation of chalcopyrite and molybdenite was investigated in this work. The waste water, which was separated from the slurry after selective flotation, was recycled in the flotation system. This operation significantly improved the subsequent flotation of chalcopyrite and saved the reagent. The results showed that the depression efficiency of sodium sulfide gradually disappeared in the recycling tests due to the consumption. The consumption of sodium sulfide in the separation was not only caused by the adsorption on mineral surfaces but also resulted from the precipitation of metal ions which released from minerals. These effects decreased the solution reducibility and the adsorption of hydrosulfide ions, finally resulting in the less depression for chalcopyrite flotation. After adding a certain amount of sodium sulfide to the recycling, the depression of chalcopyrite performed well and the pulp potential maintained at a relatively lower level. Moreover, the pulp potential was an available parameter to control the flotation separation of chalcopyrite and molybdenite, which made the method easily applied to industry.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 629-638
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the polarization states of random electromagnetic vortex beams propagating in biological tissues
    Autorzy:
    Duan, M.
    Wu, Y.
    Su, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/174047.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    random electromagnetic vortex beam
    biological tissue
    state of polarization
    Opis:
    The changes in the on-axis polarization state of random electromagnetic Gaussian Schell-model vortex beams propagating in biological tissues have been studied. In different media propagation, the bigger Cn2 is, the earlier the appearance of the inflexion points in the on-axis degree of the polarization P(0, 0, z) is. As the propagation distance increases, the values of the on-axis orientation angle θ(0, 0, z) undergo several processes: at the beginning they are positive, then gradually increase to the maximum, jump to a negative value, finally tend to a fixed value. The bigger Cn2 corresponds to previous jumping position. In the entire propagation, the values of the on-axis ellipticity ε(0, 0, z) are larger than the initial one. There exists a phenomenon that the values of P(0, 0, z), θ(0, 0, z) and ε(0, 0, z) keep their extremes in a length of propagation distances for the far infrared beams. The maximum of P(0, 0, z) is the smallest and the jumping range of θ(0, 0, z) is the largest for the ultraviolet beams. Compared with σyy > σxx, the changes in magnitudes in P(0, 0, z) are more obvious when σyy < σxx, the changes in θ(0, 0, z) are just the reverse for σyy < σxx.
    Źródło:
    Optica Applicata; 2018, 48, 2; 297-309
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of the inner flow in a centrifugal pump at the shut-off condition
    Autorzy:
    Liu, H.
    Wu, X
    Tan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/281524.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    centrifugal pump
    numerical simulation
    shut-off condition
    PIV
    Opis:
    The unsteady flow fields in a centrifugal pump at the shut-off condition (SOC) are simulated by the Unsteady Reynolds Averaged Navier-Stokes (URANS) approach. To improve simulation accuracy and assign the boundary condition, special 3D models are made. Three-dimensional URANS equations are solved on high-quality unstructured grids with the shear stress transport turbulence model by using the computational fluid dynamics (CFD) code CFX-11.0. Furthermore, the numerical simulation results are validated by particle image velocimetry (PIV) measurements. The main goal of the study is, on one hand, the validation of the numerical procedure proposed, and on the other hand, the detailed analysis of the unsteady inner flow field distribution and pressure fluctuation in the centrifugal pump at SOC. In addition, the head of the pump at SOC is predicted based on CFD results. The flow analysis indicates that there exists two eddies in each impeller flow passage, and the velocity at the volute diffusion part is very low. The amplitudes of pressure fluctuation at ƒr (impeller rotation frequency) and 3ƒr dominate in the impeller, while the pressure fluctuation at ƒb (blade passing frequency) is dominant in the volute.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 649-660
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual reference beam digital off-axis holography for exact suppression of zero-order term and twin image without spectrum loss
    Autorzy:
    Wang, M.
    Wang, K.
    Zheng, M.
    Li, F.
    Wu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174894.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    noise suppression
    pixel-by-pixel multiplication
    digital off-axis holography
    Opis:
    In this paper, we describe an effective approach to suppressing zero-order term and twin image by using pixel-by-pixel multiplication of double holograms in digital off-axis holography. This method records two holograms, respectively, by using the reference waves in different directions. It shows not only a simpler algorithm and easier implementation in experiment, but also exact and complete suppression of the zero-order term and twin image without any spectrum loss of the object in the image reconstruction, particularly when the image and the zero-order term are fairly close to each other. The experimental result approves of the theoretical prediction very well. This approach provides an effective solution to suppressing undesired noises in the digital off-axis holography.
    Źródło:
    Optica Applicata; 2017, 47, 3; 435-443
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rheological and Thermal Transport Characteristics of a Transformer Oil Based Ferrofluid
    Autorzy:
    Paulovičová, K.
    Tóthová, J.
    Rajňák, M.
    Wu, Z.
    Sundén, B.
    Wadsö, L.
    Tobiáš, T.
    Kopčanský, P.
    Timko, M.
    Lisý, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030831.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    83.80.Gv
    66.20.Ej
    44.35.+c
    Opis:
    Ferrofluids based on insulating liquids are intensively studied as a potential substitute of liquid dielectric in high voltage technologies. In this work we focus on the experimental investigation of flow and thermal transport characteristics of a ferrofluid based on transformer oil (Mogul) and iron oxide nanoparticles. The magneto-rheological behavior of the ferrofluid was studied by a rotational rheometer in the shear rate range from 1 to 1000 s¯¹ and magnetic field up to 1 T. By means of a thermal constants analyzer and a transient plane source method we obtained the thermal conductivity, specific heat and thermal diffusivity values for the studied oil and the ferrofluid. It is shown that the Newtonian character of the ferrofluid changes to a non-Newtonian with application of the magnetic field. The notable magneto-viscous effect has been observed especially at low shear rates. We found that the doping of the transformer oil by 3 wt% of the nanoparticles results in a thermal conductivity enhancement by about 3.2%.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 564-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters
    Autorzy:
    Wu, W.
    Huang, M.
    Blaabjerg, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/140537.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LCL filter
    LLCL-filter
    efficiency power loss
    modulation
    single-phase grid-tied inverter
    Opis:
    An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 1; 63-79
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Coercivity FePt Nanoparticle Assemblies Embedded in Oxide-Matrix by Atomic Layer Deposition
    Autorzy:
    Kong, J.
    Li, A.
    Gao, M.
    Yan, Q.
    Wu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399662.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Vv
    75.75.Cd
    75.50.Bb
    75.50.Ss
    Opis:
    Self-assembled face-centered cubic FePt nanoparticles were embedded into the oxide capping layer using the atomic layer deposition technology. The effect of the oxide-matrix layer on the structure, mono-dispersibility, and magnetic properties of the FePt/oxide composite thin films was investigated. Experimental results suggest that the protection of the oxide-matrix capping layer can effectively inhibit the grain growth and particle aggregation, and preserve the ordered domains of the FePt nanoparticles during the L 1_0 ordering transition through annealing. The combination of the atomic layer deposition capping layer and self-assembled FePt nanoparticles provides a new potential approach to fabricate the ultrahigh-density magnetic recording media.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 173-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Training safely, Training safety
    Autorzy:
    Wu, J.
    An, M.
    Jin, Y.
    Geng, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/116104.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    safety at sea
    Training of Crew
    Maritime Education and Training (MET)
    Training Safety
    Maritime Safety Education
    Marine Survival
    SOLAS Convention
    Self Protection
    Opis:
    It is the basic requirement of maritime safety education to guarantee the safety of teaching operation while training the crew's occupation safety capability. Marine Training Center of Shanghai Maritime University has undertaken the practical teaching of "marine survival" for many years and come up with the whole safety procedures of training. Based on the requirements of SOLAS convention and regulations of STCW over crew training, this paper introduces the safety allocation, utilization and maintenance of teaching equipments. Through the investigation of the safety situation of students' practical operation, the safety teaching method named "four in one" has been put forward, which includes the pre-teaching safety precaution, the whole monitor during the teaching process, the post-teaching summary evaluation, and the reset and standby of teaching facilities. Finally, during the learning and training of "marine survival", crews and students are called on to place priority on personal safety rather than acquisition of knowledge and skills. Only in this way can they be capable of self-protection and protection of others in the career of seafaring.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 423-427
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a 20 kJ Sparker for High Resolution Ocean Seismic Survey
    Autorzy:
    Sun, Y.
    Gao, Y.
    Yan, P.
    Wang, J.
    Yuan, W.
    Wu, H.
    Wang, Y.
    Wan, P.
    Zhao, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807914.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Wq
    43.30.+m
    Opis:
    An ocean sparker with a stored energy of 20 kJ was developed for high resolution ocean seismic survey. The sparker is mainly composed of a high voltage high frequency charging supply, energy storage capacitors, a discharging switch and discharging electrodes. The H-bridge inverter and series resonant mode were adopted in the charging supply, and a dry high voltage transformer was used to improve the safety and maintenance, the average charging rate exceeded 4 kJ/s. An optical fiber connected between the high voltage system and the control system was used to isolate high voltage and transmit the high voltage signal. The high voltage electrodes of the discharging electrodes consisted of several hundreds of electrodes. The experimental results show that the sparker can be operated at repetition rates of 12 shots/min, and can meet the expected design requirements. Further field tests will be done in the near future.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1059-1061
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation and experimental study on formation of high concentration of H2 generated by gas explosion.
    Autorzy:
    Lei, B.
    Wu, B.
    Zhao, Y.
    Ashraf, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/259802.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    gas explosion
    high concentration of H2
    numerical simulation
    explosion experiment
    Opis:
    In coal mine fire rescues, if the abnormal increase of gas concentration occurs, it is the primary thing to analyze the reasons and identify sources of the abnormal forming, which is also the basis of judge the combustion state of fire area and formulate proper fire reliefs. Nowadays, related researches have recognized the methane explosion as the source of high concentration of H2 formation, but there are few studies about the conditions and reaction mechanism of gas explosion generating high concentration of H2.Therefore, this paper uses the chemical kinetic calculation software, ChemKin, and the 20L spherical explosion experimental device to simulate the generating process and formation conditions of H2 in gas explosion. The experimental results show that: the decomposition of water vapor is the main base element reaction (R84) which leads to the generation of H2.The free radical H is the key factor to influence the formation of H2 generated from gas explosion. With the gradual increase of gas explosion concentration, the explosive reaction becomes more incomplete, and then the generating quantity of H2 increases gradually. Experimental results of 20L spherical explosion are consistent with the change trend about simulation results, which verifies the accuracy of simulation analysis. The results of explosion experiments show that when gas concentration is higher than 9%, the incomplete reaction of methane explosion increases which leads to the gradual increase of H2 formation
    Źródło:
    Polish Maritime Research; 2016, S 1; 131-137
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Speech Enhancement Based on the Multi-Scales and Multi-Thresholds of the Auditory Perception Wavelet Transform
    Autorzy:
    Tao, Z.
    Zhao, H. M.
    Zhang, X-J.
    Wu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177021.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    speech enhancement
    low SNR
    auditory perception wavelet transform
    unvoiced enhancement
    masking effect
    Opis:
    This paper proposes a speech enhancement method using the multi-scales and multi-thresholds of the auditory perception wavelet transform, which is suitable for a low SNR (signal to noise ratio) environment. This method achieves the goal of noise reduction according to the threshold processing of the human ear’s auditory masking effect on the auditory perception wavelet transform parameters of a speech signal. At the same time, in order to prevent high frequency loss during the process of noise suppression, we first make a voicing decision based on the speech signals. Afterwards, we process the unvoiced sound segment and the voiced sound segment according to the different thresholds and different judgments. Lastly, we perform objective and subjective tests on the enhanced speech. The results show that, compared to other spectral subtractions, our method keeps the components of unvoiced sound intact, while it suppresses the residual noise and the background noise. Thus, the enhanced speech has better clarity and intelligibility.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 519-532
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An EL-model based passivity control of four-phase interleaved PFC
    Autorzy:
    Hua-Wu, L.
    Hong-Xing, M.
    Jian-Feng, J.
    Xi-Jun, Y.
    Xing-Hua, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/140472.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    four-phase interleaved PFC
    passivity based control
    damping injection
    current sparing
    Opis:
    With the continuous increase of output power ratings, multi-phase (multichannel) interleaved power factor corrector (IPFC) is gradually employed in domestic and commercial inverter air-conditioners. IPFC can solve several main problems, such as power rating increase, power device selection, input current ripple reduction as well as inductor on-board mounting. But for a multi-phase IPFC, the key problem is that it should show rapid dynamic responds and good current sharing capability, so in this paper the aim is to improve the dynamic performance and current sharing capability by means of passivity control theory. Considering the power circuit topology of a four-phase IPFC, an EL (Euler-Lagrange) mathematical model is established when the IPFC operates in continuous conduction mode (CCM). Then the passivity of the four-phase IPFC is proved, and the passivity-based controller using the state variables feedback and damping injection method is designed. The proposed control scheme, which is easy to control and needs no proportion integral controller, has strong robustness on disturbance from singlephase AC input voltage, the load as well as the parameters of the employed devices. Even in wide-range load condition, the mains current has a fast dynamic response and the average output voltage almost keep unchanged. As a result, the main functions of the four-phase IPFC are implemented including nearly unitary power factor and constant DC output voltage. Meanwhile, the four-phase IPFC acquires an excellent current sparing effect after using passivity-based controller. The above analysis has been proved with simulated results by means of MATLAB/SIMULINK and experimental results, showing that the passivity-based IPFC controller has superior performances and feasibility.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 4; 613-628
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Static Unbalance Analysis and Its Measurement System For Gimbals Axes of an Inertial Stabilization Platform
    Autorzy:
    Yang, H.
    Zhao, Y.
    Li, M.
    Wu, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/221513.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inertial stabilization platform
    mass eccentricity
    angular position turntable
    dynamical model
    least-square fitting
    Opis:
    To reduce the influence of the static unbalance on an infrared missile guidance system, a new static unbalance measure system for the gimbals axes has been developed. Considering the coupling effects caused by a mass eccentricity, the static balance condition and measure sequence for each gimbal axis are obtained. A novel static unbalance test approach is proposed after analyzing the dynamic model of the measured gimbal axis. This approach is to drive the measured gimbal axis to do sinusoidal reciprocating motion in a small angle and collect its drive currents in real time. Then the static unbalance of the measured gimbal axis can be obtained by the current multi-cycle integration. Also a measuring system using the proposed approach has been developed. A balanced simulator is used to verify the proposed approach by the load and repeatability tests. The results show the proposed approach enhances the efficiency of the static unbalance measurement, and the developed measuring system is able to achieve a high precision with a greater stability.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 51-68
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ascorbate metabolism as a target for the breeding of stress resistant rice
    Autorzy:
    Frei, M.
    Holler, S.
    Ueda, Y.
    Wu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/80002.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    ascorbate
    abiotic stress
    plant tissue
    oxidative stress
    rice
    stress resistance
    zinc deficiency
    tropospheric ozone
    iron toxicity
    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:
    Advanced Characterization of Material Properties on the Nanometer Scale Using Atomic Force Microscopy
    Autorzy:
    Fenner, M.
    Wu, S.
    Yu, J.
    Huber, H.
    Kienberger, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490089.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.-g
    07.79.-v
    68.37.Ps
    68.37.Uv
    07.57.Pt
    Opis:
    We report recent advances in material characterization on the nanometer scale using scanning microwave microscopy. This combines atomic force microscopy and a vector network analyzer using microwave tip sample interaction to characterize dielectric and electronic material properties on the nanometer scale. We present the methods for calibration as well as applications. Scanning microwave microscopy features calibrated measurements of: (1) capacitance with attofarad sensitivity. For calibration a well characterized array of capacitors (0.1 fF to 10 fF) is used. The method is applied to determine the dielectric properties of thin organic films, (2) Semiconductor dopant density. Calibration is performed by imaging the cross-section of a standard sample with differently doped layers (dopant stair case) from $10^{16}$ atoms/$cm^3$ to $10^{20}$ atoms/$cm^3$.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 416-419
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the Anisotropic g Factors of the $Ni^{3+}$ Site in $La_2Ni_{0.5}Li_{0.5}O_4$
    Autorzy:
    Kuang, M.
    Wu, S.
    Zhang, Z.
    Song, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400149.pdf
    Data publikacji:
    2013-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Fc
    71.70.Ch
    75.10.Dg
    Opis:
    The anisotropic g factors $g_{∥}$ and $g_{⊥}$ of $La_2Ni_{0.5}Li_{0.5}O_4$ are theoretically investigated using the perturbation formulae of the g factors for a low spin $(S=1//2) 3d^7$ ion in tetragonally elongated octahedra. The studied $Ni^{3+} (3d^7)$ center arises from the original $Ni^{2+}$ capturing one hole by $Li^{+}$ doping. The positive anisotropy $\Delta g (= g_{⊥}-g_{∥})$ can be ascribed to the lowest $\text{}^2 A_{1g}$ state due to the obvious (about 0.14 Å) tetragonal elongation of the oxygen octahedron around the $Ni^{3+}$ site via the Jahn-Teller effect, and the effective magnetic moment is also interpreted in a uniform way. The calculated results show good agreement with the experimental data, and the imperfection of the previous studies based on various adjusted tetragonal energy splittings without correlating to the local structure of the magnetic center is thus overcome in this work.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 4; 734-736
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Magnesium Alloys Produced by the Heated Mold Continuous Casting Process
    Autorzy:
    Okayasu, M.
    Wu, S.
    Tanimoto, T.
    Takeuchi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381654.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    unidirectional solidification
    continuous casting
    mechanical properties
    microstructural characteristic
    stop magnezu
    krystalizacja kierunkowa
    odlewanie ciągłe
    właściwości mechaniczne
    charakterystyka mikrostrukturalna
    Opis:
    Investigation of the tensile and fatigue properties of cast magnesium alloys, created by the heated mold continuous casting process (HMC), was conducted. The mechanical properties of the Mg-HMC alloys were overall higher than those for the Mg alloys, made by the conventional gravity casting process (GC), and especially excellent mechanical properties were obtained for the Mg97Y2Zn1-HMC alloy. This was because of the fine-grained structure composed of the α-Mg phases with the interdendritic LPSO phase. Such mechanical properties were similar levels to those for conventional cast aluminum alloy (Al84.7Si10.5Cu2.5Fe1.3Zn1 alloys: ADC12), made by the GC process. Moreover, the tensile properties (σ and εf) and fatigue properties of the Mg97Y2Zn1-HMC alloy were about 1.5 times higher than that for the commercial Mg90Al9Zn1-GC alloy (AZ91). The high correlation rate between tensile properties and fatigue strength (endurance limit: σl) was obtained. With newly proposed etching technique, the residual stress in the Mg97Y2Zn1 alloy could be revealed, and it appeared that the high internal stress was severely accumulated in and around the long-period stacking-order phases (LPSO). This was made during the solidification process due to the different shrinkage rate between α-Mg and LPSO. In this etching technique, micro-cracks were observed on the sample surface, and amount of micro-cracks (density) could be a parameter to determine the severity of the internal stress, i.e., a large amount to micro-cracks is caused by the high internal stress.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 208-216
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Two-terminal reliability analysis for multi-phase communication networks
    Analiza niezawodności par terminali w wielofazowych sieciach komunikacyjnych
    Autorzy:
    Lu, J.-M.
    Innal, F.
    Wu, X.-Y.
    Liu, Y.
    Lundteigen, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/301295.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    binary decision diagram
    component-behavior model
    multi-phase network systems
    system reliability
    binarny schemat decyzji
    model zachowania komponentów
    systemów sieciowych wielofazowe
    niezawodność systemu
    Opis:
    Most researches of network reliability generally assume that the system structures do not change with time. This paper presents the concept of multi-phase network systems (MPNS) to consider dynamic characteristics of networks, and analyze the reliability of MPNS. MPNS reliability is evaluated through a cross-phase binary decision diagram (BDD). The BDD-based algorithm can act as a platform to consider various components behaviors such as repair and growing pressure. Case study shows that the proposed MPNS concept is an effective description of some practical communication networks, and the cross-phase BDD model is efficient in analyzing MPNS reliability.
    Większość badań niezawodności sieci ogólnie przyjąć, że struktury systemu nie zmieniają się w czasie. W artykule przedstawiono koncepcję systemów sieciowych wielofazowych (MPNS) rozpatrywanie dynamicznych właściwości sieci i analizy niezawodności MPNS. MPNS niezawodność jest oceniany przez cross-fazowego schematu decyzyjnego binarny (BDD). Algorytm z siedzibą w BDD może działać jako platforma do rozważenia różnych komponentów zachowań, takich jak naprawy i rosnącej presji. Studium przypadku pokazuje, że proponowana koncepcja MPNS jest skutecznym opis niektórych praktycznych sieci komunikacyjnych, a cross-fazowego modelu BDD jest skuteczny w analizie MPNS niezawodność.
    Źródło:
    Eksploatacja i Niezawodność; 2016, 18, 3; 418-427
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of the microcrack shape, size and direction on the poroelastic behaviors of a single osteon: a finite element study
    Autorzy:
    Cen, H-P.
    Wu, X-G.
    Yu, W-L.
    Liu, Q-Z.
    Yia, Y-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/306642.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    poroelastyczność
    mikropęknięcie
    elementy skończone
    osteon
    poroelasticity
    microcrack
    finite element
    Opis:
    In this work, a finite element study is proposed by using the Comsol Multiphysics software to evaluate the effects of microcrack shape, size and direction on the poroelastic behaviors of a single osteon. Methods: This finite element model is established by using the Comsol Multiphysics software, and we just focus on the comparison of the influences of those microcrack geometric parameters on the osteonal fluid pressure and velocity. Results: The results show that: (1) microcracks in the osteon wall can induce a release of the fluid pressure, but enlarge the velocity in this region; (2) equal-area microcrack with ellipsoid-like shape produced a larger fluid pressure and velocity fields in the osteon than that of rectangular shape; (3) in the elliptic microcracks, the longer of the length (major semi-axis) induces a smaller fluid pressure and velocity amplitudes, whereas the width (minor axis) has little effect; (4) the direction of the microcracks (major axial direction) has an limited influence area around about 1/15 of the osteon cross-sectional area. Conclusions: This model permits the linking of the external loads and microcracks to the osteonal fluid pressure and velocity, which can be used for other purpose associate microcracks with the mechanotransduction and bone remodeling.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 3-10
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    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:
    Flexible truncation method for the reliability assessment of phased mission systems with repairable components
    Zastosowanie metody elastycznego obcięcia do oceny niezawodności systemów o zadaniach okresowych z elementami naprawialnymi
    Autorzy:
    Lu, J.-M.
    Lundteigen, M. A.
    Liu, Y.
    Wu, X.-Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/300848.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    flexible truncation limit
    phased mission systems
    reliability evaluation
    repairable components
    elastyczna granica obcięcia
    systemy o zadaniach okresowych
    ocena niezawodności
    elementy naprawialne
    Opis:
    Phased-mission systems (PMS) are the system in which the component stresses and the system configuration may change over time. Real-world PMS usually consist of a large number of repetitive phases and repairable components. Existing approaches for the reliability analysis of this kind of PMS tend to suffer from the problem of state explosion or binary-decision-diagram (BDD) explosion. This paper presents a truncation method based on the BDD and Markov chains to solve the scaling issue. In our approach, the truncation mitigates the BDD explosion and broadens the applicability of the BDD & Markov method. Different from the classic truncations, our truncation limit is flexible, which ensures that ensure the truncation error is lower than the predefined threshold. The advantages of the proposed method are illustrated through two practical PMS which are challenging to classic non-simulation approaches.
    Systemy o zadaniach okresowych (phased mission systems, PMS) to takie systemy, w których naprężenia elementów składowych oraz konfiguracja systemu mogą z czasem ulegać zmianie. W warunkach rzeczywistych, PMS zazwyczaj charakteryzują się dużą liczbą powtarzalnych faz zadaniowych i składają się z wielu naprawialnych elementów. Istniejące metody analizy niezawodności tego typu systemów niestety posiadają ograniczenia związane z problemem eksplozji stanów lub eksplozji diagramów binarnych decyzji (binary decision diagram, BDD) Praca przedstawia metodę obcinania opartą na BDD oraz łańcuchach Markowa, która pozwala rozwiązać wspomniane problemy złożoności obliczeniowej. W proponowanym podejściu, obcięcie minimalizuje eksplozję BDD zwiększając możliwości zastosowania metody opartej na BDD oraz łańcuchach Markowa. W odróżnieniu od klasycznego obcinania, w opracowanej przez nas metodzie granica obcięcia jest elastyczna co pozwala zredukować błąd obcięcia poniżej wcześniej określonego progu. Zalety proponowanej metody zilustrowano na przykładzie dwóch stosowanych w praktyce systemów PMS, które stanowią wyzwanie dla klasycznych metod niesymulacyjnych.
    Źródło:
    Eksploatacja i Niezawodność; 2016, 18, 2; 229-236
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterisation of PSA/CNT/TiO2 Nano Composites and Fibres
    Przygotowanie i charakterystyka nanokompozytów PSA/CNT/TiO2 i wykonanych z nich włókien
    Autorzy:
    Xin, B J
    Chen, Z M
    Wu, X. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/232556.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    nanocomposites
    electrical conductivity
    ultraviolet resistance
    nanokompozyty
    przewodnictwo elektryczne
    odporność ultrafioletowa
    stabilność termiczna
    Opis:
    Polysulfonamide/carbon nanotubes/titanium dioxide (PSA/CNT/TiO2) nano composite spinning solutions with different CNT/TiO2 contents were prepared using the physical blending method. The corresponding fibers were extruded through a set of wet spinning unit, and composite membranes were prepared by the spin-coating method. The performances of the PSA/CNT/TiO2 nano fibers and membranes were investigated by means of SEM, FTIR and XRD etc. The influence of CNT and TiO2 on the mechanical properties, thermal stability, electrical conductivity and ultraviolet resistance of PSA nano composites was also analysed in this study. The experimental results showed that low contents of CNT/TiO2 can be distributed homogeneously in the PSA matrix; the molecular structure and chemical composition of PSA did not changed obviously; crystallisation in PSA occured at low CNT/TiO2 contents because it can act as a nucleation agent; the electrical conductivity and ultraviolet resistance of PSA nano composites can be improved significantly by blending CNT/TiO2 into the PSA matrix.
    Przygotowano przędący roztwór nanokompozytów polisulfonamid/nanorurki węglowe/dwutlenek tytanu (PSA/CNT/TiO2) o różnej zawartości CNT/TiO2. Zastosowano system przędzenia na mokro z wytłaczaniem włókien przez zestaw filierowy, membrany kompozytowe przygotowano stosując metodę powlekania. Właściwości nanowłókien PSA/CNT/TiO2 i błon badano za pomocą SEM, FTIR i dyfrakcji rentgenowskiej. Zbadano również wpływ CNT i TiO2 na właściwości termiczne, stabilność termiczną, przewodność elektryczną i odporność na promienie UV nanokompozytów PSA. Wyniki badań wykazały, że przy niskiej zawartość CNT/TiO2 można uzyskać równomierne rozłożenie nanocząstek w matrycy polimerowej PSA bez zmian struktury molekularnej i składu chemicznego PSA; krystalizacja w PSA zachodzi również przy niskiej zawartości CNT/TiO2, gdzie cząsteczki wypełniacza służą jako zarodki krystalizacji; polepszenie przewodności elektrycznej i właściwości barierowych przeciw UV można uzyskać przez dodanie do matrycy PSA badanych dodatków.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 1 (97); 24-28
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduced stress and fluctuation for the integrated α-Si TFT gate driver on the LCD
    Autorzy:
    Huang, N. X.
    Shiau, M. S.
    Wu, H.-C.
    Sun, R. C.
    Liu, D.-G.
    Powiązania:
    https://bibliotekanauki.pl/articles/397883.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    sterownik bramy
    fluktuacja hałasu
    wpływ naprężenia
    system w panelu
    gate driver
    fluctuation noise
    stress effect
    system on panel (SoP)
    Opis:
    In this paper, an integrated TFT gate driver was designed on the glass substrate not only to decrease the fluctuation at the output, but also to reduce the stress effect on the pull-down branches. The fluctuation in the voltage at the output transistor was attributed to the coupled clocks through the parasitic capacitors in the TFTs. In this study, the voltage gating the pull-down braches was reduced for longer operational lifetime. This scheme was investigated by simulation by Smart-SPICE with an α-Si TFT model from Wintek Inc. at level 35.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 3; 311-315
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usefulness of nonlinear interpolation and particle filter in Zigbee indoor positioning
    Wykorzystanie nieliniowej interpolacji oraz filtru cząsteczkowego w pozycjonowaniu wewnątrz pomieszczeń przy użyciu technologii Zigbee
    Autorzy:
    Zhang, X.
    Guo, H.
    Wu, H.
    Uradziński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/145368.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia ZigBee
    kalibracja obszaru lokalizacji
    algorytm pozycjonowania
    fingerprint positioning algorithm
    RSSI
    ZigBee sensor networks
    polynomial interpolation
    particle filter
    Opis:
    The key to fingerprint positioning algorithm is establishing effective fingerprint information database based on different reference nodes of received signal strength indicator (RSSI). Traditional method is to set the location area calibration multiple information sampling points, and collection of a large number sample data what is very time consuming. With Zigbee sensor networks as platform, considering the influence of positioning signal interference, we proposed an improved algorithm of getting virtual database based on polynomial interpolation, while the pre-estimated result was disposed by particle filter. Experimental result shows that this method can generate a quick, simple fine-grained localization information database, and improve the positioning accuracy at the same time.
    Kluczem do algorytmu pozycjonowania wykorzystującego metodę fingerprinting jest ustanowienie skutecznej bazy danych na podstawie informacji z radiowych nadajników referencyjnych przy wykorzystaniu wskaźnika mocy odbieranego sygnału (RSSI). Tradycyjna metoda oparta jest na przeprowadzeniu kalibracji obszaru lokalizacji na podstawie wielu punktów pomiarowych i otrzymaniu dużej liczby próbek, co jest bardzo czasochłonne.
    Źródło:
    Geodesy and Cartography; 2014, 63, 2; 219-233
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A CTS pump with a crossed-coupled output for higher conversion efficiency
    Autorzy:
    Hsieh, Z. H.
    Huang, N. X.
    Shiau, M. S.
    Wu, H. C.
    Yang, S.-Y.
    Liu, D.-G.
    Powiązania:
    https://bibliotekanauki.pl/articles/397847.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    DC-DC przetwornice
    CTS ładunek pompy
    sprzężenie skrośne ładunku pompy
    DC-DC converter
    CTS charge pump
    cross coupled charge pump
    Opis:
    In this paper, a novel switching-capacitor DC-DC voltage converter with higher efficiency will be presented. This circuit was designed by modifying the output stage of the conventional static charge-transfer-switch (CTS) charge pump in a cross-coupled configuration. In this design, a control scheme to overcome both the reverse charge sharing and the threshold drops in the CTS pump was also employed. In this study, the capacitances for all the pumping capacitors were selected the same as 0.1 μF. With this design, our circuit can operate with a clock rate up to 1 MHz. The performance of this circuit was first evaluated by simulation by HSPICE with the 0.35-μm technology of TSMC. The results showed that this circuit can pump the low input of 1.5V nearly 5 times at the output. The conversion gain can be around 95%. The performance of the real chip manufactured by TSMC was measured and will be compared with the simulation results.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 1; 9-14
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation, Structure and Kinetic Analysis of the Thermal Behavior of Some Energetic Salts of 3-Hydrazino-4-amino-1,2,4-triazole
    Autorzy:
    Wu, J. T.
    Zhang, J. G.
    Sun, M.
    Yin, X.
    Zhang, T. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/358073.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    synthesis
    crystal structure
    thermal analysis
    3-hydrazino-4-amino-1,2,4-triazole
    energetic salts
    Opis:
    As a key research objective for low melting explosives and propellants, energetic salts have received worldwide attention. 3-Hydrazino-4-amino-1,2,4triazole (HATr) is an important high-nitrogen compound (73.65% N) with good stability. This paper focuses on the energetic salts which were formed between HATr and picric acid (PA) or 2,4,6-trinitroresorcinol (TNR). Single crystals of HATr·PA and HATr·TNR·H2O were grown and their crystal structures determined at low temperature. They both belong to the monoclinic system, P21/n space group. The thermal characteristics of the two target salts were investigated using DSC and TG-DTG. In addition, the non-isothermal decomposition kinetics, heats of combustion and sensitivity have also been investigated. The detonation pressures (P) and detonation velocities (D) of the salts have been calculated using the K-J equations. The results indicated that both salts have certain potential applications as gunpowder and propellant materials.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 4; 481-493
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity and relationship of Hunan province of China local tree peonies based on SSR markers
    Autorzy:
    Zhang, M.-H.
    Jin, X.-L.
    Wen, Y.-F.
    Shen, S.
    Wen-Xing
    Wu, S.
    Lu, J.-H.
    Ye-Ye
    Powiązania:
    https://bibliotekanauki.pl/articles/12665369.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    China
    Hunan Province
    plant cultivation
    tree peony
    Paeonia suffruticosa
    ornamental plant
    genetic diversity
    genetic relationship
    SSR marker
    Opis:
    Paeonia sect. Moutan is a wide known ornamental plant in the world. The objective of this study was to provide the theoretical basis for scientific preservation and utilization of tree peony resources of Hunan province of China. Simple sequence repeat (SSR) markers were applied to reveal the genetic diversity and relationship of 21 tree peony resources and 45 domestic and foreign tree peony cultivars. Clear bands, the size of which ranged from 115 bp to 379 bp, were detected with 14 primers. In total, 90 alleles were detected and the number of alleles detected with one primer varied between 5 and 13; the number of effective alleles ranged from 1.183 to 2.070; the polymorphism ratio of each locus was 100%. The observed heterozygosity, which ranged from 0.120 to 0.851 with an average of 0.532, was larger than the expected one, which ranged from 0.090 to 0.470 with an average of 0.300. Shannon index ranged from 0.137 to 0.695 and fixation index ranged from −0.332 to −0.869. The results show abundant genetic diversity in tree peony of Hunan province and SSR markers distinguishing homonymous tree peony resources successfully.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 213-223
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability allocation using probabilistic analytical target cascading with efficient uncertainty propagation
    Alokacja niezawodności z wykorzystaniem probabilistycznej metody analitycznego kaskadowania celów zapewniająca wydajną propagację niepewności
    Autorzy:
    Jiang, G.
    Zhu, M.
    Wu, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/301967.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    optymalna alokacja niezawodności
    dekompozycja hierarciczna
    probabilistyczna metoda analitycznego kaskadowania celów
    propagacja niepewności
    optimal reliability allocation
    hierarchical decomposition
    probabilistic analytical target cascading
    uncertainty propagation
    Opis:
    Analytical target cascading (ATC) provides a systematic approach in solving reliability allocation problems for large scale system consisting of a large number of subsystems, modules and components. However, variability and uncertainty in design variables (e.g., component reliability) are usually inevitable, and when they are taken into consideration, the multi-level optimization will be very complicated. The impacts of uncertainty on system reliability are considered in this paper within the context of probabilistic ATC (PATC) formulation. The challenge is to reformulate constraints probabilistically and estimate uncertainty propagation throughout the hierarchy since outputs of subsystems at lower levels constitute inputs of subsystems at higher levels. The performance measure approach (PMA) and the performance moment integration (PMI) method are used to deal with the two objectives respectively. To accelerate the probabilistic optimization in each subsystem, a unified framework for integrating reliability analysis and moment estimation is proposed by incorporating PATC with single-loop method. It converts the probabilistic optimization problem into an equivalent deterministic optimization problem. The computational efficiency is remarkably improved as the lack of iterative process during uncertainty analysis. A nonlinear geometric programming example and a reliability allocation example are used to demonstrate the efficiency and accuracy of the proposed method.
    Analityczne kaskadowanie celów (ATC) stanowi systematyczne podejście do rozwiązywania zagadnień alokacji niezawodności dotyczących systemów wielkoskalowych składających się z dużej liczby podsystemów, modułów i elementów składowych. Jednakże zmienność i niepewność zmiennych projektowych (np. niezawodności elementów składowych) są zazwyczaj nieuniknione, a gdy weźmie się je pod uwagę, optymalizacja wielopoziomowa staje się bardzo skomplikowana. W prezentowanym artykule, wpływ niepewności na niezawodność systemu rozważano w kontekście formuły probabilistycznego ATC (PATC). Wyzwanie polegało na probabilistycznym przeformułowaniu ograniczeń oraz ocenie propagacji niepewności w całej hierarchii, jako że wyjścia podsystemów na niższych poziomach stanowią wejścia podsystemów na poziomach wyższych. Cele te realizowano, odpowiednio, przy użyciu metody minimum funkcji granicznej (performance measure approach, PMA) oraz metody całkowania momentów statystycznych funkcji granicznej (performance moment integration, PMI). W celu przyspieszenia probabilistycznej optymalizacji w każdym podsystemie, zaproponowano ujednolicone ramy pozwalające na integrację analizy niezawodności z oceną momentów statystycznych poprzez połączenie PATC z metodą jednopoziomową (pojedynczej pętli, single-loop method). Zaproponowana metoda polega na przekształceniu probabilistycznego zagadnienia optymalizacyjnego na deterministyczne zagadnienie optymalizacyjne. Zwiększa to znacznie wydajność obliczeniową w związku z brakiem procesu iteratywnego podczas analizy niepewności. Wydajność i trafność proponowanej metody wykazano na podstawie przykładów dotyczących programowania nieliniowego geometrycznego oraz alokacji niezawodności.
    Źródło:
    Eksploatacja i Niezawodność; 2012, 14, 4; 270-277
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and characterisation of LWIR T2SL on (100)-, (211)- and (311)-oriented GaSb substrates
    Autorzy:
    Lubyshev, Dmitri
    Fastenau, Joel M.
    Kattner, Michael
    Frey, Philip
    Nelson, Scott A.
    Flick, Ryan
    Wu, Ying
    Liu, Amy W. K.
    Szymanski, Dennis E.
    Martinez, Becky
    Furlong, Mark J.
    Dennis, Richard
    Bundas, Jason
    Sundaram, Mani
    Powiązania:
    https://bibliotekanauki.pl/articles/2204213.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    focal plane arrays
    InAs/InAsSb
    photodetectors
    long wavelength infrared type-II superlattice
    metamorphic buffers
    superlattice period reduction
    Opis:
    Ga-free InAs/InAsSb type-II superlattice structures grown on GaSb substrates have demonstrated high performance for mid-wave infrared applications. However, realisation of long wavelength infrared photodetectors based on this material system still presents challenges, especially in terms of reduced quantum efficiency. This reduction is due, in part, to the increased type-II superlattice period required to attain longer wavelengths, as thicker periods decrease the wave-function overlap for the spatially separated quantum wells. One way to improve long wavelength infrared performance is to modify the type-II superlattice designs with a shorter superlattice period for a given wavelength, thereby increasing the wave-function overlap and the resulting optical absorption. Long wavelength infrared epitaxial structures with reduced periods have been realised by shifting the lattice constant of the type-II superlattice from GaSb to AlSb. Alternatively, epitaxial growth on substrates with orientations different than the traditional (100) surface presents another way for superlattice period reduction. In this work, the authors evaluate the performance of long wavelength infrared type-II superlattice detectors grown by molecular beam epitaxy using two different approaches to reduce the superlattice period: first, a metamorphic buffer to target the AlSb lattice parameter, and second, structures lattices matched to GaSb using substrates with different orientations. The use of the metamorphic buffer enabled a ~30% reduction in the superlattice period compared to reference baseline structures, maintaining a high quantum efficiency, but with the elevated dark current related to defects generated in the metamorphic buffer. Red-shift in a cut-off wavelength obtained from growths on highindex substrates offers a potential path to improve the infrared photodetector characteristics. Focal plane arrays were fabricated on (100), (311)A- and (211)B-oriented structures to compare the performance of each approach.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144568
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation Of Segregation Of Carbon Atoms Due To Sub-Zero Cryogenic Treatment In Cold Work Tool Steel By Mechanical Spectroscopy And Atom Probe Tomography
    Doświadczalne badania segregacji atomów węgla w stali narzędziowej do pracy na zimno po obróbce kriogenicznej metodą spektroskopii mechanicznej i tomografii atomowej
    Autorzy:
    Min, N.
    Li, H. M.
    Xie, C.
    Wu, X. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/351716.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cryogenic treatment
    isothermal martensite
    atom probe tomography
    mechanical spectroscopy
    Cottrell atmosphere
    obróbka kriogeniczna
    izotermiczny martenzyt
    tomografia atomowa
    spektroskopia mechaniczna
    atmosfera Cottrella
    Opis:
    In this work, we present mechanical spectroscopy of cold work tool steel subjected to sub-zero cryogenic soaking treatment to reveal the carbon segregation and the subsequent carbides refinement. The maximum of Snoek-Köster (SK) peak height was obtained in the sample subjected to soaking 1h at −130°C cryogenic treatment. The SK peak height is reduced with prolonging the soaking time. The results indicate that an increase in the height of SK peak is connected with an increase in dislocation density and the number of segregated carbon atoms in the vicinity of dislocations or twin planes after martensite transformation at −130°C which is confirmed by corresponding TEM and atom probe tomography measurement. Hence, it is suggested that the isothermal martensite, formed during the cryogenic soaking treatment decreases (APT) the height of SK peak.
    W pracy przedstawiono wyniki spektroskopii mechanicznej stali narzędziowej do pracy na zimno poddanej obróbce kriogenicznej w celu odsłonięcia segregacji węgla i późniejszego tworzenia węglików. Dzięki połączeniu transmisyjnej mikroskopii elektronowej (TEM) i tomografii atomowej (APT) uzyskano maksymalny pik Snoek-Köstera (SK) w próbce poddanej obróbce kriogenicznej przez 1 godzinę w −130°C. Wysokość piku SK obniża się wraz z wydłużeniem czasu obróbki. Wyniki wskazują, że zwiększenie wysokości piku SK jest połączone ze wzrostem gęstości dyslokacji i liczby segregowanych atomów węgla w sąsiedztwie dyslokacji lub płaszczyzn bliźniaczych po przemianie martenzytycznej w -130°C, co potwierdzone jest odpowiednimi pomiarami TEM oraz APT. W związku z tym proponuje się, że izotermiczny martenzyt powstały podczas obróbki kriogenicznej zmniejsza wysokość piku SK.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 1109-1113
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-52 z 52

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