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    Wyświetlanie 1-9 z 9
    Tytuł:
    Method of Prediction of the Stream Flows in Poorly Gauged and Ungauged Basins
    Autorzy:
    Kuzmin, Vadim
    Pivovarova, Inna
    Shemanaev, Kirill
    Sokolova, Daria
    Batyrov, Artur
    Tran, Ngoc Anh
    Dang, DinhKha
    Powiązania:
    https://bibliotekanauki.pl/articles/123090.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    hydrological prediction
    basin
    mathematic model
    parametrization
    ungauged basin
    hydrometeorological survey
    Opis:
    The underlying principles and content of new technology for automated hydrological predictions of poorly gauged and ungauged basins were reviewed herein. Basin classification principles depending on the availability and spatial-temporal discreteness of the observations of meteorological and hydrological variables were proposed. The prediction procedure for large river systems insufficiently covered by hydrometeorological survey was outlined. The prediction methodology for Sông Sê San river basin, which is the left tributary of Mekong river, was tested. The possible options for preliminary calibration and validation of MLCM3 predictive model (Multi-Layer Conceptual Model, 3rd generation), developed within the framework of set task, were described. The software, implementing the streamflow prediction method for ungauged and poorly gauged special basins of large rivers tributaries, was tested.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 1; 180-187
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of AHP-GIS Model to Assess the Ecological Suitability of Codonopsis javanica in Kon Plong District, Kon Tum Province, Viet Nam
    Autorzy:
    Tri, Chu Luong
    Tuan, Tran Anh
    Kiem, Truong Ngoc
    Powiązania:
    https://bibliotekanauki.pl/articles/2173290.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Codonopsis javanica
    AHP
    analytic hierarchy process
    GIS
    ecological adaptation
    Kon Plong
    Opis:
    The Kon Plong district is located in the northeast area of the Kon Tum province, where ethnic people, such as Xo Dang and Hre, are dominant. With the portion of the poor families accounting for more than 50% of the total households, the improvement in the livelihood of ethnic is an emergency. Among the approaches to enhance the economical situation in the mountainous area like Kon Plong, the sustainable utilization of natural resources to produce valuable products is a possibility. The Codonopsis javanica (Blume) Hook.f. & Thomson (native name in the Vietnamese language is Dang Sam) is a precious medicinal plant with many benefits in pharmacological uses for human health. In nature, C. javanica is favorably distributed in the template climate and high mountain area. On the basis of the multi-criteria analysis using AHP (Analytic Hierarchy Process) integrated GIS, the influence of climate factors and soil features in the Kon Plong district on the growth of C. javanica was evaluated. Using AHP evaluation, the four classes of adaptation thresholds (very suitable, suitable, less suitable and not suitable) between the C. javanica growth and climate or soil factors were determined and expressed in weight values. These adaptation values (weight values) were then exported to ecological adaptation maps using the GIS mapping system. The results showed that the most suitable area (called S1 and S2) for the cultivation of C. javanica could be an area of 77 ha, accounting for 55.8% of the study area. The area with high adaptability (S1) for growing C. javanica is mainly located in the Mang Den town and Mang But commune (the south area of the Kon Plong district). These study findings suggested that the growth of C. javanica is suitable in several places in Kon Plong and the production process of C. javanica probably promotes the exploitation of sustainable utilization of local medical plant biomass in the study area.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 7; 276--283
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling labor productivity in high-rise building construction projects using neural networks
    Autorzy:
    Nguyen, Duc Anh
    Tran, Dung Quang
    Nguyen, Thoan Ngoc
    Tran, Hai Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/2203438.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Labor productivity in building construction has long been a focused research topic due to the high contribution of labor cost in the building total costs. This study, among a few studies that used scaled data that were collected directly from measuring equipment and onsite activities, utilized neural networks to model the productivity of two main construction tasks and influencing factors. The neural networks show their ability to predict the behaviors of labor productivity of the formwork and rebar tasks in a test case of a high-rise building. A multilayer perceptron that had two layers and used sigmoid as its activation function provided the best effectiveness in predicting the relations among data. Among eleven independent factors, weather (e.g., temperature, precipitation, sun) generally played the most important role while crew factors were distributed in the mid of the ranking and the site factor (working floor height) played a mild role. This study confirms the robustness of neural networks in productivity research problems and the importance of working environments to labor productivity in building construction. Managerial implications, including careful environmental factors and crew structure deliberation, evolved from the study when labor productivity improvement is considered.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 675--692
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of length to beam ratio effects on ship resistance using ranse method
    Autorzy:
    Le, Tat Hien
    Nguyen, Duy Anh
    Tran, Ngoc Tu
    Hoa, Nguyen Thi Ngọc
    Ngoc, Vu Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/32917972.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    length-beam ratio
    L/B
    resistance
    hull form
    RANSE
    Opis:
    The paper discusses the length to beam (L/B) ratio effects on ship resistance at three different Froude numbers using unsteady RANSE simulation. First, the JBC ship model was used as an initial hull form for verification and validation of predicted ship resistance results with measured data, and then the influence of the L/B ratio on ship resistance was carried out. Ship hull forms with different L/B ratios were produced from the initial one by using the Lackenby method. The numerical results obtained show the L/B ratio’s effect on ship resistance. Increases of the L/B ratio led to gradual reduction of the total ship resistance and vice versa. Analysis of the changing of the resistance components indicates that the pressure resistance changes are considerably larger than the frictional one. Finally, the paper analyses the difference in the flow field around the hull of the ship with variation of the L/B ratio to fully understand the physical phenomenon in the change of ship resistance at different L/B parameters.
    Źródło:
    Polish Maritime Research; 2023, 1; 13-24
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of effect of trim on performance of 12500DWT cargo ship using RANSE method
    Autorzy:
    Chuan, Tran Quoc
    Phuong, Nguyen Kim
    Tu, Tran Ngoc
    Quan, Mai Van
    Anh, Nguyen Duy
    Le, Tat-Hien
    Powiązania:
    https://bibliotekanauki.pl/articles/32891489.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    RANSE
    ship performance
    trim optimisation
    operating condition
    ship speed
    Opis:
    This paper deals with the results of studying the effect of trim on the performance of series cargo ship 12500DWT in full scale at two operating conditions by using the RANSE method. The Body Force Propeller method is used to simulate a rotating propeller behind the ship. The numerical predicted results at the ballast condition were verified and validated with sea trial data. The ship’s engine power curves for different trim conditions at two operating conditions were carried out to produce a data source to evaluate the effect of trim on the performance of the 12500DWT cargo ship. The results indicate that if the ship operates under optimum trim conditions, this can decrease the ship’s engine power in a range from 2.5 to 4.5% depending on different loading conditions and ship speeds. Finally, the paper also provides detailed differences in flow around the ship due to trim variation to explain the physical phenomenon of changing ship performance.
    Źródło:
    Polish Maritime Research; 2022, 1; 3-12
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatty Acid Composition and Anticancer Activity of Neutral and Polar Lipids of Pacific Oyster (Crassostrea gigas) Cultured in Khanh Hoa Coast in Vietnam
    Autorzy:
    Nguyen, Minh V.
    Kakooza, Derrick
    Do, Thi Hong Tuoi
    Tran, Anh P.
    Nguyen, Han T.
    Tran, Ngoc Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341116.pdf
    Data publikacji:
    2024-05-24
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    anticancer activity
    fatty acid profile
    lipid fraction
    n3/n6 ratio
    thrombogenicity
    Opis:
    In this study, we investigated the fatty acid composition and anticancer activity of neutral and polar lipid fractions extracted from Crassostrea gigas oysters cultured in Nha Phu Lagoon, Khanh Hoa Coast, harvested during the five months of January, April, May, September, and November. Analysis revealed that saturated fatty acids (SFAs) were the most abundant fatty acids in the neutral lipid fraction, followed by monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs). Conversely, the polar lipid fraction exhibited a different order, with PUFAs being the most abundant, followed by MUFAs and SFAs. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were identified as the most prevalent polyunsaturated fatty acids, while oleic acid and palmitic acid were the predominant monounsaturated and saturated fatty acids, respectively. Notably, the combined content of EPA and DHA in the polar lipid fraction consistently exceeded 30% throughout all five months of analysis. Thrombogenicity index (TI) values ranged from 0.13 to 0.29 for the polar lipid fraction and from 0.6 to 1.1 for the neutral lipid fraction. Moreover, the polar lipid fraction exhibited significantly higher n3/n6 ratios compared to the neutral lipid fraction. The polar lipid fraction exhibited stronger inhibitory effects on the growth of the three cancer cell lines (HepG2, MDA-MB-231, and RD) compared to the neutral lipid fraction. The findings of the present study show that lipids extracted from C. gigas oysters cultured in Khanh Hoa Coast have a weak anticancer activity but may still aid in prevention and treatment of certain cancer types.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 169-176
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-step Homogenization of Poroelastic Properties of a Limestone
    Dwu-etapowa homogenizacja właściwości poroelastycznych wapienia
    Autorzy:
    Trieu, Hung Truong
    Nguyen, Ngoc Bien
    Pham, Duc Tho
    Vu, Minh Ngoc
    Do, Ngoc Anh
    Nguyen, Sy Tuan
    Tran, Nam Hung
    Nguyen, Thi Thu Nga
    Powiązania:
    https://bibliotekanauki.pl/articles/318822.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    oolitic limestone
    tow-step homogenization
    CSA
    poro-elastic properties
    differential self-consistent
    wapień oolityczny
    homogenizacja dwuetapowa
    właściwości poroelastyczne
    zróżnicowana spójność własna
    Opis:
    This study aims at deriving the effective poroelastic properties of the oolitic limestones based on the Hashin composite sphere assemblage (CSA) micromechanical theory. The microstructure of oolitic limestones generally exhibits an assemblage of grains (oolites) surrounded by a matrix. Grain and matrix are linked via the interfacial transition zone (ITZ). Pores exist in these three material phases (oolite, ITZ and matrix). A two-step homogenization method is proposed. The first step consists of upscaling the properties of each porous phase (i.e. porous oolite, porous ITZ and porous matrix) in which each phase contains two sub-phases including pore and solid. The differential self-consistent scheme is used for the first step. At the second step, the three different porous constituents (oolite, ITZ and matrix) are assembled in a CSA model. A mathematical analogy between thermoelasticity and poroelasticity is used to obtain the effective poroelastic properties. A comparison between the proposed model and test data on the oolitic limestone from Bourgogne (France) helps to calibrate the model parameters and to highlight the role of ITZ phase.
    W artykule, przedstawiono wyniki badań efektywnych właściwości poroelastycznych wapieni oolitowych w oparciu o teorię mikromechaniczną złożonego zespołu kul Hashin (CSA). Mikrostruktura wapieni oolitycznych wykazuje generalnie zbiór ziaren (oolitów) otoczonych matrycą. Ziarno i matryca są połączone za pośrednictwem międzyfazowej strefy przejściowej (ITZ). W tych trzech fazach materiału (oolit, ITZ i matryca) istnieją pory. Zaproponowano dwuetapową metodę homogenizacji. Pierwszy etap polega na zwiększeniu skali właściwości każdej porowatej fazy (tj. Porowatego oolitu, porowatej ITZ i porowatej matrycy), w której każda faza zawiera dwie podfazy: porową i stałą. W pierwszym etapie zastosowano różnicowy schemat samouzgodnienia. Na drugim etapie trzy różne porowate składniki (oolit, ITZ i matryca) są składane w modelu CSA. Matematyczne analogie między termosprężystością a poroelastycznością są wykorzystywane do uzyskania efektywnych właściwości poroelastycznych. Porównanie proponowanego modelu z danymi testowymi dotyczącymi wapienia oolitycznego z Bourgogne (Francja) pomaga skalibrować parametry modelu i podkreślić rolę fazy ITZ.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 31-39
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of macro economic factors and financial development on energy projects - case in ASEAN countries
    Autorzy:
    Hanh, Hoang Thanh
    Huy, Dinh Tran Ngoc
    Phuong, Nguyen Thi Thanh
    Nga, Le Thi Viet
    Anh, Pham Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818318.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Ekonomii i Zarządzania
    Tematy:
    countries ASEAN
    commerce
    financial development
    energy project
    macroeconomic
    macro politicies
    kraje ASEAN
    handel
    rozwój finansowy
    projekty energetyczne
    makroekonomia
    makropolityka
    Opis:
    ASEAN (The Association of SouthEast Asian Nations) demand on energy is depending on economic growth of each country, resources, and political and regulations of each country. This study aims to investigate the role of international trade, financial development, foreign direct investment (FDI) on the consumption of renewable energy (RE) in ASEAN countries of the world. The findings explore that positive nexus among the international trade, real output, financial development, foreign direct investment and consumption of RE. Last but not least, this paper will propose several recommendations and policy suggestion for ASEAN countries to manage and encourage better renewable energy projects in the region. One of its original value is that, in the globalization and integration era, environment pollution will affect all ASEAN countries and in the region, so these nations need to link together to implement renewable projects for environment protection and for further generation.
    Źródło:
    Management; 2020, 24, 2; 146-157
    1429-9321
    2299-193X
    Pojawia się w:
    Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genotype TNF-α(-308) and Silicosis on Factory Workers in Vietnam in 2020
    Autorzy:
    Nguyen, Viet
    Nguyen, Thi Thu Huyen
    Dao, Xuan Dat
    Vu, Xuan Quy
    Pham, Thi Quan
    Le, Thi Kim Chung
    Tran, Huy Thinh
    Le, Thi Huong
    Nguyen, Ngoc Anh
    Nguyen, Viet Nhung
    Nguyen, Ngoc Hong
    Luong, Mai Anh
    Le, Thi Thanh Xuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2020235.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    silicosis
    genotype
    TNF-α
    Vietnam
    Wietnam
    genotyp
    Opis:
    The studFigy aims to determine the TNF-α single-nucleotide polymorphism TNF-α (-308) and assess the association of TNF-a(-308) SNP with the risk of silicosis among workers directly exposed to silica dust in Vietnam. A study was undertaken among 78 cases with silicosis and 103 controls without silicosis in Vietnam. Blood samples were collected for genomic DNA extraction from each subject. The phenotyping of TNF-α(-308) was performed using polymerase chain reaction‐based restriction fragment length polymorphism (PCR‐RFLP) and dye termination sequencing. Results: The average exposure time of the case group was slightly higher than that of the control group (12.46 ± 6.732 years vs. 12.09 ± 7.854 years). The majority of genotypes in both silicosis and non-silicosis was GG. When analyzing the concentration of TNF-α in the study participants' blood, it is shown that the average concentration of TNFα in the case group was higher than that in the control group. The genotype AG in the case group was 1.368 times higher than that in the control group. The percentage of all A alleles in the case group with silicosis was 1.342 times higher than the control group without the disease, similar to previous studies. Conclusion: The majority of genotypes in both groups was GG. The average concentration of TNF-α in blood, genotype AG, and the percentage of all A alleles in the case group was higher than that in the control group.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 459--466
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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