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Wyświetlanie 1-15 z 22
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
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