Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Zeng, H." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-12 z 12
    Tytuł:
    A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China
    Autorzy:
    Sun, Z.
    Zeng, H.
    Zhao, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082242.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Trilobita
    Ptychopariida
    ontogeny
    specialization
    Miaolingian
    Paleozoic
    Longgang
    Asia
    Opis:
    Trilobites achieved their maximum generic diversity in the Cambrian, but the peak of morphological disparity of their cranidia occurred in the Middle to Late Ordovician. Early to middle Cambrian trilobites with a specialized cephalon are rare, especially among the ptychoparioids, a group of libristomates featuring the so-called “generalized” bauplan. Here we describe an unusual ptychopariid trilobite Phantaspis auritus gen. et sp. nov. from the middle Cambrian (Miaolingian, Wuliuan) Mantou Formation in the Shandong Province, North China. This new taxon is characterized by a cephalon with an extended anterior area of double-lobate shape resembling a pair of rabbit ears in later ontogenetic stages; a unique type of cephalic specialization that has not been reported from other trilobites. Such a peculiar cephalon as in Phantaspis provides new insights into the variations of cephalic morphology in middle Cambrian trilobites, and may represent a heuristic example of ecological specialization to predation or an improved discoidal enrollment.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 4; 709-718
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of the aerodynamics of sail in natural wind
    Autorzy:
    Zeng, X.
    Zhang, H..
    Powiązania:
    https://bibliotekanauki.pl/articles/259718.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    natural wind
    wind sail
    aerodynamics
    sail assisted ship
    Opis:
    In order to evaluate the impacts of a motor vessel after installing wind sails, the aerodynamics of the sail should be accurately calculated. However most of the research on sails are based on stable wind instead of natural wind which is changing horizontally and vertically. In this paper wind tunnel tests are carried out based on stable wind field and simulated natural wind field, the results shown that there are 16–44% decrease in natural wind in terms of lifting coefficient and 11–42% decrease for drag coefficient. This would provide a valuable reference to the effectiveness evaluation of the impact of sails for sail assisted ships.
    Źródło:
    Polish Maritime Research; 2018, S 2; 17-22
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress-strain response of sheared wheat granular material stored in silos using triaxial compression tests
    Autorzy:
    Zeng, C.
    Gu, H.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082870.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    wheat granular
    void ratio
    confining pressure
    shearing velocity
    strength
    dilatancy
    Opis:
    Wheat granular material stored in silos usually suffers shearing loads, which induces complex stress-strain response during the silo filling and discharging process. In order to guarantee the safe storage of these granular materials, it is necessary to investigate the shearing behaviour of wheat granular material in silos. In this paper, a series of triaxial tests were conducted on wheat granular material by using a modified double cell triaxial system. The stress-strain responses including the volumetric strain behaviour were examined considering the effect of the initial void ratio, confining pressure and shearing velocity. Different shearing states were discussed to obtain their strength parameters in various conditions. The results show that the shearing characteristics of wheat granular material are influenced by the shearing velocity. The friction angles increase with the decreasing void ratio at different states. The final volumetric strain decreases with increasing confining pressure, and the dilation is diminished. The dilatancy behaviour was quantitatively evaluated based on Row’s theory for wheat granular material. The stress-strain relationship of wheat granular material was then determined.
    Źródło:
    International Agrophysics; 2020, 34, 1; 103-114
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Laplace Transform to the free vibration of continuous beams
    Zastosowanie przekształcenia Laplace’a w wolnych drganiach ciągłych wiązek
    Autorzy:
    Wen, H. B.
    Zeng, T.
    Hu, G. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/962342.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przekształcenie Laplace’a
    belka ciągła
    drganie swobodne
    metoda łączenia dzielona
    częstotliwość
    Laplace transform
    continuous beam
    free vibration
    segmented combination method
    frequency
    Opis:
    Laplace Transform is often used in solving the free vibration problems of structural beams. In existing research, there are two types of simplified models of continuous beam placement. The first is to regard the continuous beam as a single-span beam, the middle bearing of which is replaced by the bearing reaction force; the second is to divide the continuous beam into several simply supported beams, with the bending moment of the continuous beam at the middle bearing considered as the external force. Research shows that the second simplified model is incorrect, and the frequency equation derived from the first simplified model contains multiple expressions which might not be equivalent to each other. This paper specifies the application method of Laplace Transform in solving the free vibration problems of continuous beams, having great significance in the proper use of the transform method.
    Struktury ciągłej wiązki są bardzo często spotykane w projektach budowlanych. Przykłady obejmują: mostki ciągłej wiązki, stopy budynków, rury do wymiany ciepła w wymiennikach ciepła oraz wrzeciona obrabiarki. Nieodłączną częścią projektowania struktur ciągłych wiązek jest dynamiczna charakterystyczna analiza konstrukcji jako podstawy projektu antywibracyjnego. W celu uzyskania dynamicznych charakterystycznych parametrów struktur ciągłych wiązek, uczeni z kraju i z zagranicy przyjęli w celu poszukiwania rozwiązań liczne metody, w tym metodę elementów skończonych, metodę sztywności dynamicznej oraz metodę transferu matrycy. Metoda analityczna, w której wykorzystywane jest przekształcenie Laplace’a, mająca na celu rozwiązanie problemu wolnych drgań ciągłych wiązek, jest preferowana przez wielu badaczy i szeroko stosowana do rozwiązywania takich problemów w wielu dziedzinach. Niemniej jednak, istnieją pewne błędy w stosowaniu przekształcenia Laplace’a. W związku z tym, w niniejszej pracy przeprowadzono badania i analizę dotyczące różnych metod stosowania przekształcenia Laplace’a. Ponadto, w niniejszym dokumencie wyjaśniono metodę prawidłowego zastosowania przekształcenia Laplace’a podczas rozwiązywania problemu wolnego drgania ciągłej wiązki.
    Źródło:
    Archives of Civil Engineering; 2017, 63, 1; 163-180
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stochastic fractal based multiobjective fruit fly optimization
    Autorzy:
    Zuo, C.
    Wu, L.
    Zeng, Z. F.
    Wei, H. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/330026.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    multiobjective optimization
    fruit fly optimization algorithm
    stochastic fractal
    optymalizacja wielokryterialna
    algorytm optymalizacji
    fraktal stochastyczny
    Opis:
    The fruit fly optimization algorithm (FOA) is a global optimization algorithm inspired by the foraging behavior of a fruit fly swarm. In this study, a novel stochastic fractal model based fruit fly optimization algorithm is proposed for multiobjective optimization. A food source generating method based on a stochastic fractal with an adaptive parameter updating strategy is introduced to improve the convergence performance of the fruit fly optimization algorithm. To deal with multiobjective optimization problems, the Pareto domination concept is integrated into the selection process of fruit fly optimization and a novel multiobjective fruit fly optimization algorithm is then developed. Similarly to most of other multiobjective evolutionary algorithms (MOEAs), an external elitist archive is utilized to preserve the nondominated solutions found so far during the evolution, and a normalized nearest neighbor distance based density estimation strategy is adopted to keep the diversity of the external elitist archive. Eighteen benchmarks are used to test the performance of the stochastic fractal based multiobjective fruit fly optimization algorithm (SFMOFOA). Numerical results show that the SFMOFOA is able to well converge to the Pareto fronts of the test benchmarks with good distributions. Compared with four state-of-the-art methods, namely, the non-dominated sorting generic algorithm (NSGA-II), the strength Pareto evolutionary algorithm (SPEA2), multi-objective particle swarm optimization (MOPSO), and multiobjective self-adaptive differential evolution (MOSADE), the proposed SFMOFOA has better or competitive multiobjective optimization performance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 417-433
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning and expression analysis of CML27 in Brassica oleracea pollination process
    Autorzy:
    Lian, X.P.
    Zeng, J.
    Zhang, H.C.
    Yang, X.H.
    Zhao, L.
    Zhu, L.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/19583.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2018, 60, 2
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic expression profile of DNA methyltransferases in rat testis development
    Autorzy:
    Xu, H.X.
    Qin, J.Z.
    Zhang, K.Y.
    Zeng, W.X.
    Powiązania:
    https://bibliotekanauki.pl/articles/31635.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    DNA methyltransferases (Dnmts) are unique and perform specific functions during male germ cell development. To further characterize the significance of Dnmts in the events leading to production of spermatozoa, we investigated whether the expression patterns in Dnmt1, Dnmt3a, Dnmt3b and Dnmt3l were apparent in rat testes at different time points during development. The qRT-PCR results showed that expression levels of Dnmt3a and Dnmt3l were abundant before birth and were present at the highest levels in testes tissue at 18.5 days postcoitus (dpc), and gradually decreased from day 0 postpartum (dpp) to 90 dpp. Expression of Dnmt1 and Dnmt3b reached a peak after birth (P <0.01), and then gradually reduced until adulthood. Western blotting and immunolocalization analysis of Dnmt3a and Dnmt3b further confirmed the differential expression and localization of the two proteins during rat testis development. The dynamic expression profile of Dnmts implies specific and potentially nonredundant roles for each of these enzymes in the developing rat testis.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction and Wear Behavior of 201HT Cast Aluminum Alloy with Various Competitive Material
    Autorzy:
    Li, R.
    Chen, L. J.
    Su, M.
    Zeng, Q.
    Li, H.
    Liu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/382627.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting
    aluminum alloy
    friction and wear
    competitive material
    odlewanie
    stop aluminium
    tarcie i zużycie
    materiał konkurencyjny
    Opis:
    The friction and wear properties of 201HT aluminum alloys and the corresponding competitive coupons were tested on an electro-hydraulic servo face friction and wear testing machine (MM-U10G). The microstructures of the competitive coupons were investigated by scanning electron microscopy (SEM) and consequently the corresponding friction and wear mechanisms were studied. The results demonstrated that: (1) the best competitive material of friction and wear performance of the 201HT was the 201HTC. (2) the 201HTC modified by carbon following the initial mill for oil storage of the micro-groove to be produced, increased the corresponding lubrication performance reduced the friction coefficient and wear rate effectively. (3) the 201HT-201HTC could obtain both better friction and wear mainly due to the initial process of grinding following the 201HT plastic deformation occurred in the surface and the formation of a series of re-melting welding points, whereas the 201HT material hardness would be similar to the 201HTC material hardness, which led into the competitive material friction and wear performance improvement.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 55-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comprehensive Study of the Electrostatic Discharge Sensitivity and Chargeability of Tris(carbohydrazide)zinc Perchlorate
    Autorzy:
    Li, Z.
    Zeng, D.
    Zhou, Z.
    Zhou, M.
    Zhang, T.
    Huang, H.
    Zhang, J.
    Yang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/358298.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    primary explosive
    tris(carbohydrazide)zinc perchlorate
    electrostatic discharge sensitivity
    chargeability
    Opis:
    Most primary explosives are non-conductors, easily accumulate charge when contacting with and separating from other materials, and are sensitive to electrostatic discharge (ESD). In order to reduce the number of accidents caused by ESD initiation of primary explosives, studies on their electrostatic hazards are necessary. This work presents comprehensive experimental results of electrostatic discharge sensitivity and chargeability of tris(carbohydrazide)zinc perchlorate (ZnCP) under different conditions. The influences of the testing conditions, of devices, particle size, ambient temperature and relative humidity on the electrostatic discharge sensitivity and chargeability have been investigated in detail, and the quantitative regression equations obtained.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 4; 553-573
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contactless Electroreflectance Study of Temperature Dependence of Fundamental Band Gap of ZnSe
    Autorzy:
    Krystek, W.
    Malikova, L.
    Pollak, F. H.
    Tamargo, M. C.
    Dai, N.
    Zeng, L.
    Cavus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934065.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Fy
    78.20.Wc
    78.20.-e
    Opis:
    We report a systematic study of the temperature variation of the energy [E$\text{}_{0}$(T)] and broadening parameter [Γ$\text{}_{0}$(T)] of the fundamental band gap of ZnSe in the range 27 K < T < 370 K using contactless electroreflectance. The obtained values of E$\text{}_{0}$(T) and Γ$\text{}_{0}$(T) have been fit to various semi-empirical expressions to obtain information about the exciton-phonon coupling in this system. The experimentally determined E$\text{}_{0}$(T) also is of significance for technological applications since it can be used to determine the operating temperature of ZnSe-based devices such as quantum well lasers.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 1013-1017
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genome-wide association study of terpenoids in resin reveals candidate genes for resin yield in Pinus massoniana
    Autorzy:
    Bai, Q.
    Zhang, Q.
    Cai, Y.
    Lian, H.
    Liu, W.
    Luo, M.
    Zeng, L.
    He, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078149.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Pinus massoniana
    GC-MS
    terpenoid
    GWAS
    candidate gene
    Opis:
    Masson pine (Pinus massoniana) is an important species for resin tapping in China. Molecular assisted selection (MAS) has been gradually introduced in to the selection and breeding of masson pine. Until now, the lack of connection between genome information and phenotypic data has hindered the breeding and selection of important chemical compounds of xylem resin. In this study, gas chromatography mass spectrometer (GC-MS) was employed for qualitative and quantitative analysis of chemical compounds of resin collected from 69 masson pine germplasm resources. Then, genome-wide association study (GWAS) was conducted for the terpenoids with higher heritability. A total of 15 primary compounds, including six diterpenes and nine monoterpenes/sesquiterpenes, were detected from xylem resin. By using five GWAS methods, 42 associated SNPs were identified from these masson pines. The P. taeda genome database was used for detecting candidate genes related to the associated SNPs. By using transcriptome data, several members of PKc_like super family, Cytochrome P450, AP2-ERF, F-box, and ABC transporter were found to be highly expressed in the masson pines with higher resin-yielding capacity. The terpenoids associated SNPs can be directly used for MAS. These candidate genes, especially the two F-box members, will contribute to the study of terpenoid biosynthesis mechanisms in the future.
    Źródło:
    Dendrobiology; 2020, 84; 109-121
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal variations in the abundance and sinking flux of biogenic silica in Daya Bay, Northern South China Sea
    Autorzy:
    Zhao, X.
    Yang, W.
    Ma, H.
    Li, J.
    Chen, M.
    Fang, Z.
    Zhang, X.
    Zeng, J.
    Qiu, Y.
    Zheng, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48777.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biogenic silica
    flux
    thorium
    seasonal variation
    shallow water
    Daya Bay
    China Sea
    Źródło:
    Oceanologia; 2019, 61, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies