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    Wyświetlanie 1-14 z 14
    Tytuł:
    Compressive optical image encryption using phase-shifting interferometry on a joint transform correlator
    Autorzy:
    Li, J.
    Jia, B.
    Dai, X.
    Lei, M.
    Yang, C.
    Li, H.
    Li, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174905.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fully optical system
    holographic interferometry
    joint transform correlator (JTC)
    binary scrambling method
    inverse problems
    Opis:
    A compressive optical image encryption method, which combines compressive sensing with phase-shifting interferometry on a joint transform correlator, is proposed in the fully optical domain. The object image is first permutated using a binary scrambling method. Next, the permutated object field is encrypted and registered as the holograms by phase-shifting interferometry on the joint transform correlator setup. Then, the encrypted images and the key are compressed to the compressed data using single-pixel compressive imaging. The original image can be reconstructed and decrypted using the specified algorithm. The simulations demonstrate that the method is effective and suitable for image security transmission.
    Źródło:
    Optica Applicata; 2017, 47, 2; 245-256
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Different Ignition Responses of Powdery and Bulky 1,3,5-Triamino-2,4,6-trinitrobenzene (TATB) Based Polymer-bonded Explosives under Ultra-high Voltage Electrostatic Discharge
    Autorzy:
    Lyu, Z.
    Long, X.
    Li, Z.
    Dai, X.
    Deng, C.
    He, S.
    Li, M.
    Yao, K.
    Wen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358240.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    electrostatic spark sensitivity
    ultra-high voltage electrostatic discharge
    thermal effect
    electric field effect
    Opis:
    The electric spark induced ignition mechanism for explosives needs further study. The ignition of powdery and bulky TATB by electrostatic discharge (ESD) was investigated. Up to 200 kV ultra-high voltage ESD was applied to powdery and bulky explosives of two TATB-based polymer-bonded explosives (named PBX-1 and PBX-2). The results showed that the spark sensitivities of powdery and bulky explosives are extremely different for the same formulation. The 50% ignition voltages of powdery PBX-1 and PBX-2 were 10.8 kV and 8.5 kV, respectively, while the values for the bulky samples (tablets) were not less than 200 kV. Both heat and the electric field can be transmitted into the powdery samples, on the other hand only the electric field can be transmitted into the bulk samples. The electric field has a smaller contribution while the heat has a larger contribution to the ignition during an ESD, i.e., the thermal effect plays a main role in the ignition process. Our experimental results are in good agreement with recent results calculated by density functional theory.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 2; 283-298
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of Ternary Antimonides GdNiSb
    Autorzy:
    Wei, X.
    Hu, X.
    Dai, Y.
    Lei, T.
    Chu, S.
    Deng, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505358.pdf
    Data publikacji:
    2011-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.15.Ap
    71.15.Mb
    71.20.Eh
    71.20.Lp
    Opis:
    In the paper density functional theory method was applied to explore the electronic and magnetic properties of the GdNiSb in low-temperature phase with cubic MgAsAg-type structure and in the high-temperature phase. The calculations were performed by first principles full-relativistic full potential local orbital method within the local spin density approximation. The calculations results show the metallic character of GdNiSb compound in the high-temperature phase with hexagonal $AlB_2$-type structure. For the low-temperature phase of the cubic GdNiSb system, they indicate a semiconducting behavior. The density of states below the Fermi level is greater in high-temperature phase than in low-temperature one, the calculated magnetic moment is in good agreement with an available experimental value.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 3; 405-407
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Ageratina adenophora on hepatic and pulmonic pathological lesions in horses
    Autorzy:
    Gu, X.L.
    Dai, F.Y.
    Xiao, X.
    Li, G.Z.
    Zhang, L.M.
    Qu, W.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087129.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ageratina adenophora
    liver
    lung
    horse
    toxicity
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 4; 611-613
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vertical distribution of nearshore flow velocity
    Autorzy:
    Li, Ch.
    Fu, X.
    Li, R.
    Dai, L.
    Chen, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/259609.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    vertical distribution of flow velocity
    Jiangsu Sea
    nearshore
    exponential formula
    Opis:
    In this paper, a new exponential formed vertical distribution of nearshore flow velocity is constructed, which is simpler in form and more suitable for engineering application. The physical meaning of the new formula is more specific than that of Soulsby. Compared with those logarithmic formed ones, the new one does not need the maximum velocity and only needs the mean velocity in vertical, which gives it better engineering practicability. Apply the new formula to Jiangsu coastal area and compare the results with that of Soulsby whose results show the new formula agrees better with the measured flow velocity, which reasonably reflects the basic principles of vertical distribution of flow velocity.
    Źródło:
    Polish Maritime Research; 2016, S 1; 104-108
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for probing the refractive index change in photorefractive crystals
    Autorzy:
    Fu, M.
    Gao, C.
    Wang, X.
    Cui, Y.
    Dai, S
    Powiązania:
    https://bibliotekanauki.pl/articles/174913.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Fourier transform profilometry
    refractive index change
    photorefractive effect
    Opis:
    A method for probing refractive index changes in photorefractive crystals using an interferometric technique and digital image processing was proposed. Based on equal thickness interference in LiNbO3 crystal and Fourier transform profilometry, we obtained phase value changes in interferograms induced by a photorefractive effect, and further calculated refractive index changes. The maximal values for extraordinary light (e-light) and ordinary light (o-light) are 6.6×10–4 and 1.2×10–4, respectively.
    Źródło:
    Optica Applicata; 2013, 43, 4; 731-737
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Research on Characterization of Crushability for Foundry Sand Particles
    Autorzy:
    Dai, Y.
    Ma, Q. Y.
    Li, X. H.
    Zhang, X.
    Hu, F. P.
    Zhang, Y.
    Xie, W. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/379689.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry sand particle
    mechanical load
    AFS grain fineness
    crushability
    piasek odlewniczy
    obciążenie mechaniczne
    rozdrobnienie ziarna
    Opis:
    In this paper, crushability of foundry sand particles was studied. Three kinds of in-service silica sands in foundry enterprises selected as the study object, and foundry sand particles were subjected to mechanical load and thermal load during service were analyzed. A set of methods for simulating mechanical load and thermal load by milling and thermal-cold cycling were designed and researched, which were used to characterize the crushability for silica sand particles, the microstructure was observed by SEM. According to the user’s experience in actual application, the crushability of Sand C was the best and then Sand B, the last Sand A. The results indicated that mechanical load, thermal load and thermal-mechanical load can all be used to characterize the crushability of foundry sand particles. Microscopic appearances can qualitatively characterize the crushability of foundry sand particles to a certain extent, combining with the additions and cracks which are observed on the surface.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 231-235
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Recovery in α-Fe e$\text{}^{-}$-irradiated at 300 K
    Autorzy:
    Dai, G. H.
    Li, X. H.
    Moser, P.
    Moya, G.
    Van Duysen, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928989.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.70.Bv
    61.80.Fe
    78.70.Bj
    Opis:
    Defect annealing recovery has been studied, by measuring positron lifetime spectra, in high-purity α-iron irradiated at 300 K with 3 MeV electrons to a fluency of 7 × 10$\text{}^{19}$ cm$\text{}^{-2}$. Vacancy clusters containing 6-10 single vacancies were observed immediately after irradiation during which they were possibly forming (the so-called "irradiation annealing"). With increasing temperature, the agglomerates continually grow in size at the expense of their concentration, giving rise to the formation of microvoids (> 15 vacancies). Also present were other types of defects, probably immobile vacancies trapped by impurity (e.g. carbon) atoms and dislocation/loops generated presumably from collapse of voids during the relatively high dose irradiation and/or the annealing. The immobile vacancies eventually became movable at around 350 K, supplying the growing clusters and thus leading to a stabilization in their concentration till around 500 K. Between 500 and 700 K, microvoids gradually evaporated, but the dislocation-associated defects were able to survive annealing at temperatures as high as 700 K. The void size and concentration and their evolution have been evaluated on the basis of both the to date theoretical and experimental studies. The temperature dependence was also, observed of positron trapping into vacancy agglomerates of various sizes.Za
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 277-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on thermo physical parameter of loose coal bulk
    Badania eksperymentalne parametrów termofizycznych luźnych brył węgla
    Autorzy:
    Chen, Q. H.
    Dai, G. L.
    Zhang, G. S.
    Fan, X. Q.
    Qin, R. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/348819.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    parametry termofizyczne
    luźny węgiel
    badania eksperymentalne
    współczynniki wpływu
    thermo-physical parameters
    loose coal
    experimental study
    influence factors
    Opis:
    Experimental study was carried out on the thermo physical parameter of loose coal bulk, based on hot-wired method, the relationship between thermo physical parameter of loose coal bulk and each influence factors obtained, and the result shows that the thermal conductivity increased and thermal capacity decreased on condition that the coal rank increased, with the increasing of water content, thermal conductivity and thermal capacity are both have the trend of ascent. Within the experimental temperature limit (< 110 degrees of Celsius), thermal conductivity shows linear growth trend with the increasing of temperature. When voidage increased, thermal conductivity decreased, but the relevance between thermal capacity and voidage is unnoticeable.
    Wyniki badań eksperymentalnych przeprowadzonych w celu określenia parametrów termofizycznych luźnych brył węgla metodą "gorącej nici" (ang. hot-wire method) i zależności pomiędzy parametrem termofizycznym luźnych brył węgla a każdym z uzyskanych współczynników wpływu pokazują wzrost przewodności cieplnej i obniżenie pojemności cieplnej wraz z poprawą jakości węgla. Przy zwiększaniu zawartości wody przewodność cieplna i pojemność cieplna wykazują tendencje wzrostowe. W badanym zakresie temperatur (< 110 stopni Celsjusza) przewodność cieplna wzrasta liniowo wraz ze wzrostem temperatury. Zwiększenie przestrzeni pomiędzy elementami skutkowało obniżeniem przewodności cieplnej, jednak nie zaobserwowano związku pomiędzy pojemnością cieplną a większą przestrzenią między elementami.
    Źródło:
    AGH Journal of Mining and Geoengineering; 2012, 36, 3; 89-98
    1732-6702
    Pojawia się w:
    AGH Journal of Mining and Geoengineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast and effective extraction for equivalent shunt resistances of triple-junction concentrator solar cells
    Autorzy:
    Lv, H
    Dai, J
    Sheng, F
    Liu, W
    Ma, X
    Cheng, C
    Lv, Q
    Powiązania:
    https://bibliotekanauki.pl/articles/174425.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    concentrator photovoltaic
    triple junction solar cell
    equivalent shunt resistance
    Opis:
    Fast and effective extraction of equivalent shunt resistance for each subcell of GaInP/GaInAs/Ge triple-junction concentrator solar cells is presented. The two-diode model of single junction was introduced to establish the equivalent circuit of triple-junction solar cells. The current-voltage characteristic of the triple-junction solar cells was measured under AM1.5D spectrum, C = 576 and T = 303 K. Equivalent shunt resistance of each subcell was extracted from its estimated current-voltage curve. The estimated current-voltage curve of the triple-junction solar cells shows a good agreement with the experimental data in 0.31% deviation. The degradation in the equivalent shunt resistance for Ge subcell was intentionally introduced to indicate the mechanism of current-matching operation for different subcells, with the maximum output power of the triple-junction solar cells deteriorating from 3.5 to 3.17 W. The results can offer performance analysis and optimum design of photovoltaic applications.
    Źródło:
    Optica Applicata; 2015, 45, 2; 227-235
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized route planning approach for hazardous materials transportation with equity consideration
    Autorzy:
    Chai, H.
    He, R.-C.
    Jia, X.-yan
    Ma, Ch.-x
    Dai, C.-jie
    Powiązania:
    https://bibliotekanauki.pl/articles/223759.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hazardous materials transportation
    transportation
    route optimization
    risk equity
    multi-objective optimization
    NSGA-II algorithm
    genetic algorithm
    transport materiałów niebezpiecznych
    materiały niebezpieczne
    optymalizacja trasy
    kapitał własny
    optymalizacja wielokryterialna
    algorytm NSGA-II
    algorytm genetyczny
    Opis:
    Hazardous materials transportation should consider risk equity and transportation risk and cost. In the hazardous materials transportation process, we consider risk equity as an important condition in optimizing vehicle routing for the long-term transport of hazardous materials between single or multiple origin-destination pairs (O-D) to reduce the distribution difference of hazardous materials transportation risk over populated areas. First, a risk equity evaluation scheme is proposed to reflect the risk difference among the areas. The evaluation scheme uses standard deviation to measure the risk differences among populated areas. Second, a risk distribution equity model is proposed to decrease the risk difference among populated areas by adjusting the path frequency between O-D pairs for hazardous materials transportation. The model is converted into two sub models to facilitate decision-making, and an algorithm is provided for each sub model. Finally, we design a numerical example to verify the accuracy and rationality of the model and algorithm. The numerical example shows that the proposed model is essential and feasible for reducing the complexity and increasing the portability of the transportation process.
    Źródło:
    Archives of Transport; 2018, 46, 2; 33-46
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of a linear epitope in the capsid protein of goose astrovirus with monoclonal antibody
    Autorzy:
    Dai, G.
    Huang, X.
    Liu, Q.
    Li, Y.
    Zhang, L.
    Han, K.
    Yang, J.
    Liu, Y.
    Xue, F.
    Zhao, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647377.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    epitope
    goose astrovirus
    capsid protein
    monoclonal antibody
    Opis:
    Goose astrovirus (GoAstV) is a novel avastrovirus that typically causes gosling gout and results in 2 to 20% mortality. GoAstV capsid protein is the sole structural protein, which is responsible for viral attachment, assembly, maturation as well as eliciting host antibodies. However, the epitopes within capsid protein have not been well studied. In this study, a monoclonal antibody, named 1D7, was generated against GoAstV capsid protein by hybridoma technology. Western blot results showed that this MAb could react with recombinant capsid protein expressed in E. coli. Also, it recognized the precursor of capsid protein, VP90 and VP70, in GoAstV-infected cells. Besides, excellent specificity of MAb 1D7 was further demonstrated in indirect immunofluorescence assay and immunohistochemical analysis. Epitope mapping results revealed that MAb 1D7 recognized the epitope 33QKVY 36 within Cap protein. Sequence alignment indicated that 33QKVY 36 is a conserved epitope among the isolates of goose astrovirus type 2 (GoAstV-2), suggesting the potential for its use in GoAstV-2 specific diagnostic assay. These findings may provide some insight into a function of the GoAstV capsid protein and further contribute to the development of diagnostic methods for GoAstV infection.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 4; 579-587
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the State of Internal Stress and Strain of TATB-based Polymer Bonded Explosive Using Strain Markers and Cone-Beam Computed Tomography
    Autorzy:
    Dai, B.
    Lan, L.-G.
    Zhang, W.-B.
    Tian, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358613.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    technology of materials
    testing and analysis
    compression molding
    polymer bonded explosive
    stress state
    strain ellipsoid
    X-ray tomography
    Opis:
    Precise measurement of the inner structural strain of polymer bonded explosive (PBXs) granules during compression molding is highly desirable in order to investigate the inner stress distribution field and its underlying generation mechanism, with the aim of improving the stress distribution uniformity. In this contribution, TATB-based (1,3,5-triamino-2,4,6-trinitrobenzene) PBX granules were formulated and the stress-strain state of the PBX granules during the warm molding process was analyzed. Strain markers were implanted at different locations and the deformation characteristics and regularity of the embedded spherical strain markers were obtained by X-ray micro-tomography. Thus the local strain states at different locations could be obtained, and the local stress state could be deduced. The results showed that axisymmetric deformation occurred in all of the strain markers, where the flat strain ellipsoids were mainly compressed uni-axially. In the central region, the stress was mainly in an axial direction, and the shear force was small. Not only axial stresses, but also large shear stresses in the surrounding region of the cylindrical grains were present. The stress gradient in the central region was greater than that in the surrounding region. The stress was greater in the surrounding region because this region was squeezed by the mold. The maximum strain degree was 44.8% larger than the minimum strain degree. The local stress increment in each region was quantified. The stress increments of the three axes were in the range 14.2-19.5 MPa. This study examined the feasibility of evaluating the inner stress–strain state of PBX granules in a quantitative manner, which is significant in determining the inner strain and stress distribution in PBX granules during the molding process.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 3; 688-707
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE FORMATION OF AN INDEPENDENT VIETNAMESE STATE WITH ITS TRANSFORMATION INTO A CENTRALIZED FEUDAL MONARCHY DURING THE XTH-XIVTH CENTURIES
    Становлення незалежної в’єтнамської держави та її перетворення у централізовану феодальну монархію у X-XIV століттях
    Autorzy:
    Prypik, Yevhen
    Powiązania:
    https://bibliotekanauki.pl/articles/894317.pdf
    Data publikacji:
    2020
    Wydawca:
    National Academy of Sciences of Ukraine. Institute of World History
    Tematy:
    the Viets, the Chams, Dai Viet, Champa, Dinh dynasty, Ly dynasty, Tran dynasty, city of Thang Long
    в’єти, тями (чами), Дайв’єт, Тямпа (Чампа), династія Дінь, династія Лі, династія Чан, місто Тханглонг
    Opis:
    У статті розглядається процес становлення незалежної в’єтнамської держави, починаючи з X ст., коли в’єтнамський народ виборов незалежність у боротьбі з китайськими загарбниками.У 938 р. в’єтнамський воєначальник Нго Куен звільнив країну від китайського панування, що тривало близько тисячі років, і заснував династію Нго (939-965 рр.). У період правління династії Лі (1009-1225 рр.) значного поширення набув буддизм, який став державною релігією. У 1054 р. країна отримала нову назву Дайв’єт,що означає “Великий Вє’т”, тобто у назві країни відобразилось ім’я етнічної групи – в’єтів, яка складала переважну більшість населення стародавнього В’єтнаму.Під цією назвою країна буде відома світові впродовжпонад семи століть аж до 1804 р. Особливу увагу в статті приділено відносинам Дайв’єту і держави Тямпа (або Чампа), яка існувала на території сучасного центрального та південного В’єтнаму і в часи розквіту (VIII-XI cт.) займала до половини території цієї країни. У 1225 р. до влади у Дайв’єті прийшла нова династія Чан, яка правила країною 175 років. Головною загрозою на півночі залишалась китайська імперія Сун, а після 1256 р. – монгольська імперія Юань, до складу якої увійшов увесь захоплений на той час монголами Китай. Дайв’єту довелось тричі зіткнутись з монгольською навалою (у 1258 р. 1285 р. і 1287-88 рр.) і всі три рази, незважаючи на значні втрати та руйнування, в’єтнамцям вдалося розгромити ворога та примусити його війська залишити країну. Під час правління династії Чан в країні склалась усталена система феодальної монархії. Значного поширення набуло конфуціанство, китайська етично-філософська школа, яка за сприяння імператорів династії Чан впроваджувалась як система принципів організації в’єтнамського  суспільства. Загалом, за часів правління династій Лі та Чан, порівняно невеликий Дайв’єт перетворився на могутню з військової точки зору державу, яка здатна була протистояти значно сильнішим у цьому плані китайській та монгольській імперіям, що створило передумови не тільки для збереження незалежності та територіальної цілісності країни, але й для подальшої експансії в’єтнамської держави у південному та західному напрямках.
    The article examines the process of formation of an independent Vietnamese state since the Xth century, when the Viet people gained independence in the fight against the Chinese invaders.In 938, the Vietnamese military leader Ngo Quyen liberated the country from the Chinese rule, whichlasted about one thousand years, and founded the Ngo dynasty (939-965). During the reign of the Ly dynasty(1009-1225) Buddhism became the state religion. In 1054, the countryreceived a new name Dai Viet,meaning “Great Viet”, i.e. the name of the country reflected the name of the ethnic group – the Viets, which made up the vast majority of the population of ancient Vietnam.Under this name, Vietnam will be known to the world for more than seven centuries until 1804. The article pays a special attention to the relations between Dai Viet and the country called Champa, which existed in the territory of present-daycentral and southern Vietnam and during its heyday (VIIIth-XIth centuries) occupied up to half of the territory of what is now Vietnam. In 1225, a new Tran dynasty came to power in Dai Viet andruled the country for 175 years. During this period, the Chinese Song Empire remained a main threat in the north of the country, and after the conquest of China by the Mongolsthis place was taken by the Mongol Yuan Empire. Dai Viet had to face the Mongol invasion three times (in 1258, 1285 and 1287-88), and all three times, despite heavy losses and destruction, the Viets managed to defeat the enemy and force his troops to leave the country.During the reign of the Tran dynasty, a system of feudal monarchy was established in the country.Confucianism, the Chinese school of ethics and philosophy, was introduced as a system of principles for the organization of the ancient Vietnamese society and became widespread in Dai Viet. In general, during the reign of Ly and Tran dynasties, the relatively small Dai Viet became a militarily powerful state, capable to resistmuch stronger Chinese and Mongol empires.This created the preconditions not only for preserving the country’s independence and territorial integrity, but also for the further expansion of Dai Viet in southern and western directions.
    Źródło:
    Проблеми всесвітньої історії; 2020, 10; 7-18
    2707-6776
    Pojawia się w:
    Проблеми всесвітньої історії
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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