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    Wyświetlanie 1-23 z 23
    Tytuł:
    Effect of Nitrogen and Potassium on Growth, Yield, and Seed Quality of Quinoa in Ferralsols and Acrisols under Rainfed Conditions
    Autorzy:
    Van Minh, Nguyen
    Hoang, Dinh Thai
    Anh, Dang Thi Phuong
    Long, Nguyen Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/2086357.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    acrisols
    ferralsols
    nitrogen
    potassium
    quinoa
    Opis:
    The study has investigated the individual and combined effects of nitrogen and potassium on the growth, grain yield, and quality of quinoa in ferralsols and acrisols. The experiments were conducted during the dry season under rainfed conditions in Central Highland, Vietnam. The factorial design was a randomized complete block design with three replications. The results revealed the positive impacts of nitrogen and potassium on the growth and yield of quinoa. However, after the application of an optimum dose of nitrogen, growth, and yield were not significantly changed and even decreased when the dose continued increasing. Higher levels of nitrogen and potassium application resulted in greater protein and fat content, but lower starch and fiber contents, compared to lower levels. The fertilizer practice has to rely on soil fertility. The study shows that the application of 150 kg N and 105 kg K2O ha-1 could be the optimum rate of nitrogen and potassium for quinoa production in ferralsols and acrisols in Central Highland.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 4; 164--172
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution University Training Flexible Adapting to the Context of Digital Transformation
    Autorzy:
    Nguyen, Duy Minh
    Nguyen, Van Huan
    Powiązania:
    https://bibliotekanauki.pl/articles/1193450.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Digital transformation
    digital economy
    digital education
    digital enterprise
    industrial revolution 4.0
    Opis:
    The emergence of the Industrial Revolution 4.0, the digital trend or the digital transformation is really taking place strongly in all fields. The "core" issue of Industrial Revolution 4.0 is digital transformation, with the integration of digitalization, intelligent data connection and processing. The digital economy not only creates high scale and growth rate for economies, but also helps maintain more sustainable growth. This is because the core technology applied to the digital economy will help to create better and more effective solutions for people through the rational use of resources, minimizing pollution problems. The digital economy is part of the economy. Digital economy development is the use of digital technology and intelligent data processing to create new business models, create digital products or services or assist in providing digital services to businesses, with the convergence of modern technology platform. Recognizing the digital transformation trend, most developed economies in the world have adopted a digital technology development strategy. In particular, countries focus on researching and applying new technologies to economic growth. Research by Oxford University and McKinsey Consulting (USA) has shown that 50% of jobs in developed countries will be replaced by automated processes in the next 15 years. This percentage is forecast to be even higher in developing countries like Vietnam. Up to now, more than half of the world's population is connected online, one third are on social media. The developed economies in the world all offer digital technology development strategies associated with economic growth. Therefore, universities need to train digital human resources to meet the development needs of the digital economy.
    Źródło:
    World Scientific News; 2021, 157; 129-139
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Sound Absorbers Based on Open-Cell Foams via Microstructure-Based Modeling
    Autorzy:
    Trinh, Van-Hai
    Nguyen, Thien-Van
    Nguyen, Thi-Hai-Nhu
    Nguyen, Minh-Tan
    Powiązania:
    https://bibliotekanauki.pl/articles/31339944.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    monodisperse foam
    cellular morphology
    transports
    sound absorption
    equivalent fluid
    multiscale simulation
    Opis:
    Effects of microstructure factors on the acoustic performance of open-cell foams can be characterized numerically by a microstructure-based approach. To this regard, the numerical homogenization approach and the equivalent-fluid theory are employed to study the acoustic behavior of random open-cell foams within their Voronoi tessellation-based Representative Volume Elements (RVE). As a validation step, the numerical predictions are compared with the reference findings to either verify the finite element procedure or demonstrate that the constructed RVE can capture both the local geometrical characteristics and the acoustic macrobehavior of cellular solid foams. It can be seen from the obtained results that the morphological characteristics of open-cell foams could be controlled to achieve the desired sound absorbing behavior. In addition, the analytical expressions, formulating the relationship between the geometry of foam absorbers and their target absorption performance, are established to design sound absorbing foam layers.
    Źródło:
    Archives of Acoustics; 2022, 47, 4; 501-512
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulating and Predicting Escape Routes for Ventilation Network of Duong Huy Coal Company using Ventsim DESIGN Software
    Symulacja i przewidywanie dróg ewakuacyjnych dla Sieci Wentylacyjnej Spółki Węglowej Duong Huy przy użyciu oprogramowania VENTSIM DESIGN
    Autorzy:
    Duy Huy, Nguyen
    Cao Khai, Nguyen
    Van Thinh, Nguyen
    Van Quang, Nguyen
    Minh Chien, Nguyen
    Khac Duy, Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2172066.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    ventilation network
    Ventsim DESIGN
    escape routes
    Duong Huy coal company
    vinacomin
    sieć wentylacyjna
    drogi ewakuacyjne
    spółka węglowa Duong Huy
    Vinacomin
    Opis:
    In underground coal mining, the ventilation task plays an important role because it ensures enough fresh air for workers and decrease negative effects of deleterious gases released from coal seam as well as blasting explosions. Furthermore, when coal mines go deeper, the ventilation task is more and more important. In order to guarantee good ventilation performance, we should apply a simulation software. In this article, we present the application of Ventsim DESIGN software for ventilation network of Duong Huy Coal company as well as prediction of escape routes in urgent cases. The simulation results demonstrate that the software offers good performance, stable operation as well as the suitable escape routes in urgent cases.
    W podziemnym górnictwie węgla wentylacja odgrywa ważną rolę, ponieważ zapewnia wystarczającą ilość świeżego powietrza dla pracowników i zmniejsza negatywne skutki uwalniania się szkodliwych gazów z pokładów węgla oraz możliwość wystąpienia wybuchów. Ponadto, gdy eksploatacja sięga głębiej, zadanie wentylacji jest coraz ważniejsze. W celu zagwarantowania dobrej wydajności wentylacji do obliczeń sieci wentylacyjnej stosuje się oprogramowanie symulacyjne. W artykule przedstawiono zastosowanie oprogramowania Ventsim DESIGN dla obliczenia sieci wentylacyjnej kopalni Duong Huy oraz przewidywania dróg ewakuacyjnych w nagłych przypadkach. Wyniki symulacji pokazują, że program dobrze wylicza wydajność sieci , warunki stabilnej pracy oraz odpowiednie drogi ewakuacyjne w nagłych przypadkach.
    Źródło:
    Inżynieria Mineralna; 2022, 2; 151--157
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static behaviour of functionally graded plates resting on elastic foundations using neutral surface concept
    Autorzy:
    Van-Loi, Nguyen
    Minh-Tu, Tran
    Van-Long, Nguyen
    Quang-Huy, Le
    Powiązania:
    https://bibliotekanauki.pl/articles/1845053.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    static analysis
    functionally graded plate
    Winkler-Pasternak foundation
    physical neutral surface
    four-variable refined theory
    analiza statyczna
    podłoże typu Winkler-Pasternak
    fizycznie neutralna powierzchnia
    Opis:
    In this study, static behaviors of functionally graded plates resting on Winkler-Pasternak elastic foundation using the four-variable refined theory and the physical neutral surface concept is reported. The four-variable refined theory assumes that the transverse shear strain has a parabolic distribution across the plate’s thickness, thus, there is no need to use the shear correction factor. The material properties of the plate vary continuously and smoothly according to the thickness direction by a power-law distribution. The geometrical middle surface of the functionally graded plate selected in computations is very popular in the existing literature. By contrast, in this study, the physical neutral surface of the plate is used. Based on the four-variable refined plate theory and the principle of virtual work, the governing equations of the plate are derived. Next, an analytical solution for the functionally graded plate resting on the Winkler-Pasternak elastic foundation is solved using the Navier’s procedure. In numerical investigations, a comparison of the static behaviors of the functionally graded plate between several models of displacement field using the physical neutral surface is given, and parametric studies are also presented.
    Źródło:
    Archive of Mechanical Engineering; 2021, LVIII, 1; 5-22
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of solid and ionic surface reaction form to surface quality when using chemical-mechanical slurry polishing
    Autorzy:
    Duc, Le Anh
    Hieu, Pham Minh
    Mai, Nguyen Trong
    Trong, Thai Van
    Quang, Nguyen Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/2171776.pdf
    Data publikacji:
    2022
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    chemical-mechanical slurry
    polishing
    abrasive particle
    ionic surface reaction
    yttrium aluminum garnet
    surface roughness
    Opis:
    The process of removing machining residues using chemical-mechanical slurry (CMS) has an important place in the creation of ultra-precise components in optical devices. Based on this feature, this work investigates the efficiency of the CMS polishing process by comparing the surface reaction modes by the ionic and solid reaction modes when polishing the yttrium aluminum garnet (YAG) and sapphire crystal. The study procedures were conducted to clarify the polishing performance corresponding to these two reaction types. The obtained experiments results show that the balance between the mechanical effect process using CMS polishing technology with chemical effect can be achieved with the ionic reaction mode. The results also show that the ionic surface reaction modes give more uniform material removal than the solid reaction on YAG and sapphire crystal surfaces. Therefore, the surface quality when polished by CMS technology with ionic surface reaction modes is better than that of solid surface reaction.
    Źródło:
    Journal of Machine Engineering; 2022, 22, 4; 82--94
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of earning management and surplus free cash flow on the banking sector performance
    Wpływ zarządzania zyskami i swobodnego przepływu nadwyżki na wyniki sektora bankowego
    Autorzy:
    Thai, Van Ha
    Dinh, Van Tien
    Nguyen, Van Song
    Nguyen, Minh Hien
    Nguyen, Cong Tiep
    Pham, Thi Lan Phuong
    Powiązania:
    https://bibliotekanauki.pl/articles/2021135.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    earnings management
    banking sector
    fixed effect model
    financial performance
    zarządzanie wynikami
    sektor bankowy
    model o efekcie stałym
    wyniki finansowe
    Opis:
    The banking sector is considered as the backbone of the economy and needs to examine its performance frequently and get the attention of recent studies and regulators. Therefore, the purpose of the present research is to examine the impact of earnings management and surplus free cash flow on the state-owned banks of Vietnam. This study has used secondary data collection methods and used the financial statements of the twenty-five commercial banks in Vietnam. This study extracted the data from 2009 to 2020 banks’ financial statement. This study has executed the fixed effect model (FEM) and robust standard error to analyze the nexus among the variables. The results have revealed that earnings management and surplus free cash flow have a positive association with the banking sector of Vietnam. This research provides the guidelines to the regulators while formulating policies related to the banking sector performance and earning management.
    Sektor bankowy jest uważany za kręgosłup gospodarki i musi często analizować swoje wyniki oraz zwracać uwagę na ostatnie badania oraz organy regulacyjne. Dlatego celem niniejszego badania jest zbadanie wpływu manipulacji dochodami i swobodnego przepływu nadwyżki środków pieniężnych na państwowe banki w Wietnamie. W badaniu wykorzystano wtórne metody zbierania danych i wykorzystano sprawozdania finansowe dwudziestu pięciu banków komercyjnych w Wietnamie.W badaniu tym wyodrębniono dane ze sprawozdań finansowych banków z lat 2009-2020. W badaniu tym wykorzystano model efektów stałych (MES) i solidny błąd standardowy w celu przeanalizowania powiązania między zmiennymi. Wyniki wykazały, że zarządzanie dochodami i nadwyżki wolnych przepływów pieniężnych mają pozytywny związek z sektorem bankowym Wietnamu. Badanie to dostarcza wytycznych dla regulatorów przy formułowaniu polityk związanych z wynikami sektora bankowego i zarządzaniem dochodami.
    Źródło:
    Polish Journal of Management Studies; 2021, 23, 1; 403-417
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance optimization of multi-roller flat burnishing process in terms of surface properties
    Autorzy:
    Le, Minh-Thai
    Van, An-Le
    Nguyen, Trung Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/24084649.pdf
    Data publikacji:
    2023
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    roller burnishing
    average roughness
    Brinell hardness
    process parameter
    Opis:
    In the current investigation, two primary indicators, including the average roughness (AR) and Brinell hardness (BH) of the roller burnishing operation are enhanced using the optimal inputs (the spindle speed-S, feed rate-f, and depth of penetration-D). The performance measures are developed using the Kriging approach and optimal outcomes are generated by the Crow Search Algorithm (CSA). The optimal outcomes generated by the CSA of the S, f, and D were 832 rpm, 112 mm/min, and 0.12 mm, while the AR was reduced by 37.0% and the BH was increased by 29.9%, respectively. The optimal findings could be utilized in the practice for enhancing the burnished quality and to develop a professional system related to the roller burnishing operation. The Kriging-based AR and BH correlations could be used to present nonlinear experimental data. The optimizing technique could be utilized to deal with optimizing problems for different machining operations.
    Źródło:
    Journal of Machine Engineering; 2023, 23, 2; 159--173
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of behaviour of the steel arch support in the geological and mining conditions of the Cam Pha coal basin, Vietnam
    Autorzy:
    Nguyen, Phu Minh Vuong
    Rotkegel, Marek
    Van, Hoang Do
    Powiązania:
    https://bibliotekanauki.pl/articles/1853833.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    podpora stalowa
    analiza numeryczna
    górnictwo wietnamskie
    steel arch support
    profiles of steel arch support
    numerical analysis
    Vietnamese coal mining industry
    Opis:
    In recent years, the Vietnamese coal mining industry has observed a dynamic increase in both its production and efficiency. In Vietnam, the most precious type of coal is anthracite, which is found in the Quang Ninh province. Industrial anthracite deposits are estimated to be over 2 billion Mg. At present, coal deposits are extracted mostly by the underground method. Coal production is gradually increasing in the underground mines in the Quang Ninh area and it is expected to constitute about 75% of the country’s total coal production in 2030. This involves an increase in the number and length of underground workings. Cam Pha is the largest coal basin of Vietnam, located in the Quang Ninh province. So far, the yearly length of underground workings driven in underground mines in the Cam Pha basin is roughly 90÷150 km. About 84 % of these underground workings are supported by the steel arch support made of SWP profile. A similar situation can be observed in Russia, Ukraine, China, India and Turkey. In addition, the average length of repaired underground workings in the Cam Pha basin constitutes approximately 30% of the total length driven . The main cause was reported is loss of underground workings stability. This requires significant material and labour costs as well as the cost of replacing damaged elements. Addi-tionally, it disturbs the continuity of the mining operations.This article presents the results of the numerical modelling of the rock mass around underground wor-kings driven in typical geo-mining conditions for underground coal mines in the Cam Pha basin, supported by the steel arch support made of SWP and V profiles. As a result of the conducted analyses, the range of failure zone of the rock mass around underground workings and the distribution of reduced stress in the steel arch support elements were determined. The effort states of the steel arch support made of SWP22 profile and V21 profile were compared. The simulations considered different inclinations angle of coal seam, following the structure of the rock mass in the Cam Pha basin. The analysis was carried out using the based-finite difference method code, FLAC2D. Based on the obtained results, actions for improving the stability of underground workings driven in the underground mines of the Cam Pha basin were proposed.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 3; 551-567
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic algorithm application for optimizing traffic signal timing reflecting vehicle emission intensity
    Autorzy:
    Hai, Dinh Tuan
    Manh, Do Van
    Nhat, Nguyen Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/2098075.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    traffic signal optimization
    heuristic solution
    genetic algorithm
    vehicle exhaust emission
    intelligent transport system
    optymalizacja sygnalizacji drogowej
    rozwiązanie heurystyczne
    algorytm genetyczny
    emisja spalin pojazdu
    inteligentny system transportowy
    Opis:
    Urbanization has created continuous growth in transportation demand, leading to serious issues, including infrastructure overload, disrupted traffic flow, and associated vehicular emissions. As a result, resolving these problems has become one of the primary missions of governments worldwide. The optimization of the traffic signal timing system is considered a promising approach to overcoming the negative consequences of increasing vehicle volume. In metropolises, oversaturated intersections, where the traffic density and vehicle exhaust emission levels are significant, have been considered as the priority to target. Several scientists have attempted to design traffic lights with the most appropriate timing. However, the majority of previous studies have not formed a comprehensive evaluation of essential factors, especially regarding the appropriate weighting of vehicle emission parameters. By assessing the all-inclusive relationship of critical elements with an emphasis on vehicle exhaust emissions, a performance index model using a genetic algorithm (GA) is established in this paper, demonstrated by data from a case study in Taiwan.
    Źródło:
    Transport Problems; 2021, 16, 1; 5--16
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of the hydraulic jump length in a smooth trapezoidal channel
    Autorzy:
    Ngoc, Nguyen Minh
    Cuong, Pham Hong
    Son, Tran Thanh
    Nam, Nguyen Van
    Phong, Nguyen Thanh
    Powiązania:
    https://bibliotekanauki.pl/articles/35547843.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    jump lenght
    roller length
    hydraulic jump
    trapezoidal channel
    spillway
    Opis:
    The article showed the result of investigation of the length of hydraulic jump in trapezoidal channel. In this study, the basic factors that affect the length (Lj) and roller length (Lr) of hydraulic jump were investigated by physical trapezoidal channel’s model. The experiment carried out in purpose to establish a new empirical equation for calculating the roller length (Lr) of the jump in the horizontal trapezoidal channel with the upstream flow Froude number 4.0 to 9.0 (the steady jump). The hydraulic characteristics of forced jump were measured and statistically calculated by excel software. The results of data analysis showed that the MAPE was relatively small (< 5%), and R2 > 0.9 (strong correlation between predicted and observed values) and other statistical indicators are less than 0.1 (MSE = 0.004, RMSE = 0.062 và MEA = 0.047). Therefore, the equation found could be appropriated and applied to calculate characteristics of hydraulic jump trapezoidal channel.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 1; 63-76
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the Resampling Methods for Gridded DEM Downscaling
    Porównanie metod ponownego próbkowania dla skalowanego w dół zmniejszania DEM
    Autorzy:
    Nguyen, Quang Minh
    Nguyen, Thi Thu Huong
    La, Phu Hien
    Duong, Thi Tuyet Nhung
    Nguyen, Thi Minh Hong
    Vu, Van Anh
    Powiązania:
    https://bibliotekanauki.pl/articles/318242.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    próbkowanie
    skalowanie
    DEM
    resampling
    downscaling
    Opis:
    In this paper, a comparison and evaluation of three resampling methods for gridded DEM is implemented. The evaluation was based on the results of bilinear resampling, bi-cubic and Kriging resampling methods for an experiment using both degraded and sampled datasets at 20 m and 60 m spatial resolutions. The evaluation of the algorithms was accomplished comprehensively with visual and quantitative assessments. The visual assessment process was based on direct comparison of the same topographic features in different downscaled images, scatterplots and profiles. The quantitative assessment was based on the most commonly used parameters for DEM accuracy assessment such as root mean square errors (RMSEs), linear regression parameters m and b, and correlation coefficient R. Both visual and quantitative assessment revealed greater accuracy of the Kriging over the other two conventional methods.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 2/2; 240-248
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Understanding fuel saving and clean fuel strategies towards green maritime
    Autorzy:
    Van Nhanh, Nguyen
    Rudzki, Krzysztof
    Dzida, Marek
    Pham, Nguyen Dang Khoa
    Pham, Minh Tuan
    Nguyen, Phuoc Quy Phong
    Nguyen, Xuan Phuong
    Powiązania:
    https://bibliotekanauki.pl/articles/32919438.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine engine
    alternative fuel
    green maritime
    fuel savings
    low-carbon strategy
    Opis:
    Due to recent emission-associated regulations imposed on marine fuel, ship owners have been forced to seek alternate fuels, in order to meet the new limits. The aim of achieving low-carbon shipping by the year 2050, has meant that alternative marine fuels, as well as various technological and operational initiatives, need to be taken into account. This article evaluates and examines recent clean fuels and novel clean technologies for vessels. The alternative fuels are classified as low-carbon fuels, carbon-free fuels, and carbon neutral fuels, based on their properties. Fuel properties, the status of technological development, and existing challenges are also summarised in this paper. Furthermore, researchers have also investigated energy-saving devices and discovered that zero-carbon and virtually zero-carbon clean fuels, together with clean production, might play an important part in shipping, despite the commercial impracticability of existing costs and infrastructure. More interestingly, the transition to marine fuel is known to be a lengthy process; thus, early consensus-building, as well as action-adoption, in the maritime community is critical for meeting the expectations and aims of sustainable marine transportation.
    Źródło:
    Polish Maritime Research; 2023, 2; 146-164
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of spontaneously generated coherence and phase of laser fields on optical bistability in a three-level atomic medium: an analytical approach
    Autorzy:
    Van, Doai Le
    Minh, Phuong Le Thi
    Tien, Dung Nguyen
    Xuan, Khoa Dinh
    Huy, Bang Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/174730.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical bistability
    electromagnetically induced transparency
    spontaneously generated coherence
    Opis:
    The influence of spontaneously generated coherence and relative phase of laser fields on optical bistability in a three-level atomic medium under electromagnetically induced transparency was studied by using a density matrix theory. An input-output intensity relation of a probe laser field is derived as an analytical function of parameters of a controlling light field, the relative phase, and the spontaneously generated coherence. This function can be fitted with experimental values to be a semi-empirical model which is helpful for finding related applications. It is shown that thresholds and width of the optical bistability hysteresis loop can be manipulated with the controllable parameters. On the other hand, the influence of population relaxation between two ground hyperfine levels on the optical bistability behavior is significant for small coupling field intensity.
    Źródło:
    Optica Applicata; 2019, 49, 3; 509-522
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An advanced IoT system for monitoring and analysing chosen power quality parameters in micro-grid solution
    Autorzy:
    Khoa, Ngo Minh
    Dai, Le Van
    Tung, Doan Duc
    Toan, Nguyen An
    Powiązania:
    https://bibliotekanauki.pl/articles/1841334.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy management
    internet of things (IoT)
    micro-grid
    power quality (PQ)
    ThingSpeak cloud
    Opis:
    This paper proposes an advanced Internet of Things (IoT) system for measuring, monitoring, and recording some power quality (PQ) parameters. The proposed systemis designed and developed for both hardware and software. For the hardware unit, three PZEM-004T modules with non-invasive current transformer (CT) sensors are used tomeasure the PQ parameters and an Arduino WeMos D1 R1 ESP8266 microcontroller isused to receive data from the sensors and send this data to the server via the internet. For the software unit, an algorithm using Matlab software is developed to send measurement datato the ThingSpeak cloud. The proposed system can monitor and analyse the PQ parameters including frequency, root mean square (RMS) voltage, RMS current, active power, and the power factor of a low-voltage load in real-time. These PQ parameters can be stored on theThingSpeak cloud during the monitoring period; hence the standard deviation in statistics of the voltage and frequency is applied to analyse and evaluate PQ at the monitoring point.The experimental tests are carried out on low-voltage networks 380/220 V. The obtained results show that the proposed system can be usefully applied for monitoring and analysing chosen PQ parameters in micro-grid solutions.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 173-188
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation in Root Development Response of Napier Grass to Drought Stress
    Autorzy:
    Nguyen, Loc Van
    Tran, Ngoc Minh Thi
    Nguyen, Long Viet
    Phan, Hong Nhung Thi
    Rumanzi, Mbaraka Saidi
    Pham, Cuong Van
    Tang, Hanh Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/1955525.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    drought level
    Napier grass
    root response
    root length
    Opis:
    Global climate change and increasing agricultural activity are the main causes of biotic and abiotic stresses, which negatively affect the plant growth and crop yields. The plant root system is the first organ for sensing the soil moisture limitation; therefore root growth under elevated water deficit is an important indicator for plant’s drought tolerance. Although the previous studies focused on the morphological traits of Napier grasses under water stresses, the root growth changes due to drought levels remain largely unclear. In order to evaluate variation in root performance to respond to drought stress, four cultivars named "Cỏ voi thuần" (CVT), King grass, Packchong, and VA06 were grown for 10 days under drought conditions under polyethylene glycol 6000 (PEG6000): 0% PEG6000 as control, 5% PEG6000, 10% PEG6000, 15% PEG6000 and 20% PEG6000. As compared to control, the root growth of all cultivars was reduced under drought treatments; however, significant variation in the root development response to drought levels was found. Among Napier cultivars, "Cỏ voi thuần" expressed drought-tolerant genotypes. The information on the root length, diameter, surface area and volume of the cultivars reveals interesting guidelines for further studies to explore the mechanisms behind root adaptation of Napier grasses to drought.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 8; 64-74
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal choice of the number of ground control points for developing precise DSM using light-weight UAV in small and medium-sized open-pit mine
    Autorzy:
    Long, Nguyen Quoc
    Goyal, Ropesh
    Bui, Luyen K.
    Cuong, Cao Xuan
    Canh, Le Van
    Minh, Nguyen Quang
    Bui, Xuan‑Nam
    Powiązania:
    https://bibliotekanauki.pl/articles/2073863.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    statek powietrzny
    kopalnia odkrywkowa
    technologia UAV
    lightweight UAV
    digital surface model
    ground control points
    small and medium-sized open-pit mine
    Opis:
    UAV technology is being applied for DSM generation in open-pit mines with a well-established fact that the precision of such DSM is improved by increasing the number of Ground Control Points (GCPs). However, DSMs are updated frequently in an open-pit mine where the surface is excavated continuously. This imposes a challenge to arrange and maintain the GCPs in the field. Therefore, an optimal number of GCPs should be determined to obtain sufficiently accurate DSMs while maintaining safety, time, and cost-effectiveness in the project. This study investigates the influence of the numbers of GCPs and their network configuration in the Long Son quarry, Vietnam. The analysis involved DSMs generated from eight cases with a total of 18 GCPs and each having five network configurations. The inter-case and intra-case accuracy of DSMs is assessed based on RMSEXY, RMSEZ, and RMSEXYZ. The results show that for a small- or medium-sized open-pit mine having an area of approximately 36 hectares, five GCPs are sufficient to achieve an overall accuracy of less than 10 cm. It is further shown that the optimal choice of the number of GCPs for DSM generation in such a mining site is seven due to a significant improvement in accuracy (<3.5 cm) and a decrease in configuration dependency compared to the five GCPs.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 3; 369--384
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid end-to-end approach integrating online learning with face-identification system
    Autorzy:
    Nguyene, Dat Van
    Nguyen, Son Trung
    Pham, Thi Hong Anh
    Pham, Van Toan
    Hoang, Thao Thu
    Thanh, Ta Minh
    Powiązania:
    https://bibliotekanauki.pl/articles/27312886.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    facial recognition
    visual search engine
    end-to-end applications
    online learning
    ElasticSearch (ES)
    ES
    Opis:
    Facial recognition has been one of the most intriguing and exciting research topics over the last few years. It involves multiple face-based algorithms such asfacial detection, facial alignment, facial representation, and facial recognition. However, all of these algorithms are derived from large deep-learning architectures, leading to limitations in development, scalability, accuracy, and deployment for public use with mere CPU servers. Also, large data sets that contain hundreds of thousands of records are often required for training purposes. In this paper, we propose a complete pipeline for an effective face-recognition application that requires only a small data set of Vietnamese celebrities and a CPU for training, solving the problem of data leakage, and the need for GPU devices. The pipeline is based on the combination of a conversion algorithm from face vectors to string tokens and the indexing & retrieval process by Elasticsearch, thereby tackling the problem of online learning in facial recognition. Compared with other popular algorithms on the same data set, our proposed pipeline not only outperforms the counterpart in terms of accuracy but also delivers faster inference, which is essential to real-time applications.
    Źródło:
    Computer Science; 2023, 24 (1); 141--161
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Cashew Apple Pomace Powder in Pasta Making: Effects of Powder Ratio on the Product Quality
    Autorzy:
    Nguyen, Thi Phuong Trang
    Tran, Thi Thu Tra
    Ton, Nu Minh Nguyet
    Le, Van Viet Man
    Powiązania:
    https://bibliotekanauki.pl/articles/16538534.pdf
    Data publikacji:
    2023-02-21
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antioxidant capacity
    by-product
    dietary fiber
    pasta
    Opis:
    The production of cashew apple juice generates fruit pomace which is rich in dietary fiber and phenolic compounds and shows high antioxidant capacity. In this research, the effects of different ratios of cashew apple pomace powder (CAPP) in the pasta formulation on the product quality were investigated. Increase in CAPP level in the pasta recipe from 0 to 20% enhanced the total dietary fiber and total phenolic content of the product by 4.1 times and 11.8 times, respectively, as well as improved the 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity and ferric reducing antioxidant power by 18.2 times and 28.6 times, respectively. Nevertheless, the increased level of CAPP in the pasta recipe resulted in decreased cooking quality, textural properties and overall acceptability of the pasta. Pasta sample with 10% CAPP level in the recipe was considered high-fiber food with acceptable sensory quality. Therefore, CAPP may be considered a promising source of dietary fiber and antioxidants for the development of healthy food products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 1; 50-58
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Mulberry Pomace Addition and Transglutaminase Treatment on the Quality of Pasta Enriched with Antioxidants and Dietary Fiber
    Autorzy:
    Ta, Thi Minh Ngoc
    Hoang, Chi Hieu
    Nguyen, Thao Mi
    Tran, Thi Thu Tra
    Ton, Nu Minh Nguyet
    Van Viet Man, Le
    Powiązania:
    https://bibliotekanauki.pl/articles/24024618.pdf
    Data publikacji:
    2023-10-10
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    antioxidant
    dietary fiber
    mulberry pomace
    pasta
    transglutaminase
    Opis:
    Mulberry pomace powder, a by-product of mulberry juice processing, was added to pasta recipe to make pasta with high dietary fiber and antioxidant contents. The effects of mulberry pomace ratio on the nutritional, textural and cooking properties as well as the sensory overall acceptance of the product were investigated. A significant increment in dietary fiber and total anthocyanin contents as well as decrement in cooking quality, texture and color change were observed. The cooking loss increased with the substitution level of mulberry pomace while the optimal cooking time, swelling index and water absorption index decreased. The quality improvement of 10% mulberry pomace fortified pasta was investigated by adding a transglutaminase preparation with enzyme dosage from 0.25 to 1.00 U/g protein. The fortified pasta treated with transglutaminase at 0.50 U/g protein showed a significant improvement in chewiness, tensile strength and elongation rate but was not significantly affected in terms of the swelling index and water absorption. The use of transglutaminase also improved the overall acceptability of the fortified pasta. Mulberry pomace powder may, therefore, be considered a potential antioxidant-rich and dietary fiber-rich material for incorporation into pasta products.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 4; 301-310
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on social security through Buddhism in the Tran dynasty
    Badania nad zabezpieczeniem społecznym przez buddyzm w dynastii Tran
    Autorzy:
    (Rev. Thich Thanh Dien), Duong Quang Dien
    Thi Phuong Chi, Nguyen
    Van Tuan, Nguyen
    Van Kieu (Most Rev. Thich Dao Thinh), Bui
    Thi Minh Hong (Bhikkhuni Thich Dieu Tam), Cao
    Thi Nga, Nguyen
    Powiązania:
    https://bibliotekanauki.pl/articles/1790768.pdf
    Data publikacji:
    2021
    Wydawca:
    Towarzystwo Wiedzy Powszechnej w Szczecinie
    Tematy:
    Social security
    amnesty
    Buddhism
    Tran dynasty
    amnestia
    Buddyzm
    dynastia Tran.
    zabezpieczenie spoełczne
    Opis:
    During the period from 8th Century to early decades of the 14th Century, Dai Viet was in the course of prosperous development with reigns of Tran Thai Tong (ruled from 1226-1258), Tran Thanh Tong (1258-1278), Tran Nhan Tong (1278-1293), Tran Anh Tong (1293-1314), Tran Minh Tong (1914-1329), and Trang Hien Ton (1329-1341). We can say that this is time of prosperity and advance of Tran Dynasty. The Tran Kings’ piety upon Buddhism had a great impact on thought and government policies, especially the spirit of equality and humanity. Kings of Tran express a great care on life of the people, try to relieve their toils, reduce their duties, help the poor, and enhance the social security.116 From Tran Du Tong onwards, all was not as before anymore. Research on social security by Buddhism in Tran dynasty can be presented in many aspects, but this article just focuses on clarifying the social security through Buddhism’s care on material and spiritual life of the people.
    W okresie od VIII wieku do wczesnych dekad XIV wieku - za czasów panowania: Tran Thai Tong (rządził od 1226-1258), Tran Thanh Tong (1258-1278), Tran Nhan Tong (1278-1293), Tran Anh Tong (1293-1314), Tran Minh Tong (1914-1329), i Trang Hien Ton (1329-1341) - Dai Viet był w na drodze rozwoju. Można powiedzieć, że jest to czas prosperity i postępu dynastii Tran. Pobożność królów Tranu wobec buddyzmu miała wielki wpływ na myślenie i politykę rządu, zwłaszcza na ducha równości i człowieczeństwa. Królowie dynastii Tran wyrażają wielką troskę o życie ludzi, starają się ulżyć im w trudach, zmniejszają ich obowiązki, pomagają biednym i zwiększają bezpieczeństwo społeczne. Od czasów Tran Du Tong, wszystko nie było już takie jak dawniej. Badania nad zabezpieczeniem społecznym przez Buddyzm w dynastii Tran można przedstawić w wielu aspektach, niniejszy artykuł koncentruje się jednak tylko na wyjaśnieniu zabezpieczenia społecznego poprzez opiekę Buddyzmu nad materialnym i duchowym życiem ludzi.
    Źródło:
    Edukacja Humanistyczna; 2021, 1, 44; 171-193
    1507-4943
    Pojawia się w:
    Edukacja Humanistyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellulase Treatment of Acerola Seeds and Its Effect on Physicochemical Properties and Antioxidant Potential of Dietary Fiber-Rich Cookies
    Autorzy:
    Tran, Van Nguyen
    Dang, Diep Xuan Thao
    Pham, Thi Kim Oanh
    Tran, Thi Quynh Nhi
    Ton, Nu Minh Nguyet
    Tran, Thi Thu Tra
    Le, Van Viet Man
    Powiązania:
    https://bibliotekanauki.pl/articles/48899277.pdf
    Data publikacji:
    2024-09-03
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    bakery product
    cellulolysis
    dimensional characteristics
    Malpighia emarginata
    proximate composition
    textural analysis
    Opis:
    Acerola seeds are a by-product of the food industry, which is rich in dietary fiber and antioxidants. This study evaluated the effects of cellulase treatment conditions, including the initial moisture content, enzyme dose, and incubation time, on the insoluble, soluble, and total dietary fiber content of acerola seed powder (ASP). The blends of wheat flour with untreated and cellulase-treated ASP (0, 10, 15, 20, 25, and 30%, w/w) were then used to produce cookies. The suitable conditions for the enzymatic treatment were the initial moisture content of 6 g/g dry weight (DW), an enzyme dose of 10 U/g DW and incubation time of 90 min. The cookies produced from flour blends with ASP had higher dietary fiber, ascorbic acid and total phenolic contents, and antioxidant capacity, compared to the control cookies without ASP. Phytate content in the cookies obtained with the lowest level of fortification (10%, w/w) was similar to that in the control cookies. The use of cellulase-treated ASP resulted in a lower ratio of insoluble to soluble dietary fiber in the cookies compared to when the untreated ASP was used. In addition, the cookies with cellulase-treated ASP had lower hardness and higher fracturability values than those fortified with the untreated ASP. The overall acceptability of the cookies produced with ASP was higher or comparable to the control cookies. For the first time, the low-cost ASP was used to improve the nutritional quality of cookies. The treated ASP is a novel promising dietary fiber- and antioxidant-rich ingredient for cookie preparation.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 3; 268-279
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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