Informacja

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

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

Wyszukujesz frazę "Nguyen, Thi Thanh" wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-25 z 41
Tytuł:
Methods for assessment and testing students’ learning outcomes in cooperative teaching
Metody oceniania i testowania efektów kształcenia studentów w nauczaniu we współpracy
Autorzy:
Nguyen, Thi Thanh
Powiązania:
https://bibliotekanauki.pl/articles/551311.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
assessment and testing methods
cooperative teaching
method of implementation
cooperative behaviors
cooperative learning skills
metody oceniania i testowania
nauczanie kooperatywne
metody realizacji
zachowania kooperatywne
umiejętności kooperatywnego uczenia się
Opis:
This article presents some methods for assessing and testing student learning outcomes in cooperative teaching in order to help lecturers to assess objectively as well as to clearly present the results achieved by various groups and individuals. Understanding the basics of assessment can have a positive impact on every student. It is essential to adjust the methods of assessment to teaching and create incentives that will increase students’ interest in learning
Artykuł prezentuje kilka metod oceniania i testowania efektów kształcenia studentów w ramach nauczania opierającego się na współpracy w grupie. Przykłady metod zaprezentowanych w tekście mogą pomoc wykładowcom w obiektywnym ocenianiu, a także w jasnym prezentowaniu efektów osiąganych przez poszczególne grupy i osoby. Wyjaśnienie podstaw oceniania może wpłynąć pozytywnie na każdego studenta. Podstawą jest dostosowanie metod oceniania do nauczania, a także tworzenie zachęt, które zwiększą zainteresowanie studentów uczeniem się.
Źródło:
Relacje. Studia z nauk społecznych; 2016, 2; 209-215
2543-5124
Pojawia się w:
Relacje. Studia z nauk społecznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparing Shrimp Shell-Derived Chitosan with Rice Husk-Derived Biochar for Efficient Safranin O Removal from Aqueous Solution
Autorzy:
Phuong, Do Thi My
Thao, Nguyen Thi Thanh
Loc, Nguyen Xuan
Powiązania:
https://bibliotekanauki.pl/articles/2202335.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
biochar
chitosan
rice husk
Safranin O
shrimp shell
Opis:
In this study, the shrimp shell-derived chitosan was coated onto rice husk-derived biochar to form chitosan/biochar bio-composite beads. The physicochemical properties of biochar (BC) and chitosan/biochar beads (CS@BC) were characterized by BET, SEM-EDX, FTIR, and pHpzc analyses, which were then tested for their capacity to remove Safranin O (SO) from water. In kinetics, the pseudo-second-order model was found to well represent experimental data, indicating the adsorption was mainly a chemical process. The intra-particle diffusion model was not the sole rate-limiting step, because the results did not pass through the origin. In isotherms, both the Langmuir and Freundlich models described well the equilibrium adsorption data. The CS@BC adsorbent showed adsorption capacity at 77.94 mg/g for SO, which is higher than BC adsorbent with 62.25 mg/g (experimental conditions: pH ~ 7.0, dosage = 0.2 g, contact time = 240 min, and temperature = 298 K). The findings revealed that the biochar-loaded chitosan can improve the adsorption capacity of SO. It is predicted that the enhancement in the functional groups (i.e., -NH2 and -OH groups) of CS@BC could contribute to the electrostatic interactions and the complexation between SO and CS@BC, thereby enhancing the Safranin O adsorption from water.
Źródło:
Journal of Ecological Engineering; 2023, 24, 1; 248--259
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Career Orientation of Students in the Faculty of Mining at Hanoi University of Mining and Geology
Autorzy:
Truong, Thi Hoa
Nguyen, Thuy Quynh
Nguyen, Thi Thanh Tra
Nguyen, Tat Thang
Powiązania:
https://bibliotekanauki.pl/articles/2020954.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
student
profession
career orientation
Faculty of Mining
studenci
kariera
Wydział Górniczy
Opis:
Career orientation has become significant in Vietnamese education recently. To students of the Mining Faculty of Hanoi University of Mining and Geology, this issue is more important as society changes its acceptance of mining. The research uses investigation, interview, and observation methods for 205 students to see their career orientation. The performance is on the following criteria: 1) Career choice based on individual interests, abilities, personalities, career values; 2) Understanding of the profession in aspects of quality and capacity, workplace, future working environment, the development trend, etc.; 3) The suitability of the profession with individual interests, abilities, personality, and values of the profession during the study; 4) Study plans to meet industry requirements; 5) Self-development plans in the future career. Research results show that the majority of students have the right and appropriate career. These students have clear and positive motivations and goals in the learning process. Only a few students have not determined the proper position in the profession due to their emotions, which are not stable and oriented.
Źródło:
Inżynieria Mineralna; 2021, 2; 555--566
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:
Research of Building the Reasonable Mixing Ratio between Waste Rock and Fly Ash as Backfill Material in Mongduong-Cocsau Area, Quang Ninh, Vietnam
Autorzy:
Nguyen, Phi Hung
Nguyen, Cao Khai
Nguyen, Thi Kim Thanh
Powiązania:
https://bibliotekanauki.pl/articles/27323277.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
waste rock
fly ash
shrinkage rate
pipeline transportation capacity
górnictwo
transport
rurociągi
Wietnam
Opis:
The coal mining industry in Quang Ninh province is primarily focused on serving thermal power plants which has resulted in a substantial amount of waste rock and ash. This way has not only narrowed the used land but also had a negative impact on the environment. However, the economic development plan for the province until 2030 emphasizes the development of a greener economy. Therefore, balancing between economic growth and environmental protection is one of the significant challenges of this province. To solve the problem of waste rock and ash dumps, some methods have been proposed. It tends to use waste materials for backfilling the underground mines, this can help to minimize the bad impact on the environment. Additionally, Another solution is to handle the waste in abandoned mining areas, or use them as construction materials. These ways are expected to partially reduce the bad effects of waste rock and ash dumps on the environment. In the world, there are many studies on filling using waste rock and fly ash, but in Vietnam this issue is quite new. In order to turn waste rock and fly ash into filling materials, the article researches on a laboratory scale, the ability of transportation in hydraulic pipelines, level of the water separation and shrinkage of mixtures of rock and fly ash in the Mong Duong – Coc Sau area with the different proportions. The results of the experiments show that the area has appropriate mixing ratio as 70–73% of waste rock and 30–27% of fly ash, this ratio satisfies the transportation conditions in the pipeline and the shrinkage rate of 8, 8–12.3%. The indicators in experiments show that it is able to take waste rock into mined underground area to fill, which prevents displacement of strata from mining, protects the underground water flow, and also reduces negative impact of waste rock on environment.
Źródło:
Inżynieria Mineralna; 2023, 2; 257--265
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research the Integration of Geodetic and Geotechnical Methods in Monitoring the Horizontal Displacement of Diaphragm Walls
Autorzy:
Pham, Quoc Khanh
Tran, Ngoc Dong
Nguyen, Thi Kim Thanh
Pham, Van Chung
Powiązania:
https://bibliotekanauki.pl/articles/2020165.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
deformation monitoring
diaphragm wall
engineering surveying
soft ground
deformacje
monitoring
grunt
Opis:
This article investigates the integration of geodetic and geotechnical methods for monitoring the horizontal displacement of diaphragm walls. The results show that when the horizontal displacement is measured by the geotechnical method using an inclinometer sensor, the center point at the bottom of the guide pipe is usually chosen to be the origin to calculate displacements of the upper points. However, it is challenging to survey the bottom point for checking its stability directly. If this bottom point moves, the observation results will be incorrect. Thus, the guide pipe must be installed in the stable rock layer. But in the soft ground, this rock layer locates more deeply than the diaphragm walls, so the guide pipe cannot be laid out at the required location. Geodetic methods can directly observe the displacement of the center point on the top of the guide pipe with absolute displacement values at high accuracy. Because the displacements of observation points are determined at stable benchmarks, these values are considered the pipe's displacement. Thus, an integrated solution allows the center point on the top of the pipe to be the origin to calculate the displacements of different points located inside the diaphragm wall. Then, the calculated values are calibrated back to the inclinometer observed values to achieve highly reliable displacement, which reflects the moving of diaphragm walls. An experiment integrating the geodetic and geotechnical methods is conducted with an observation point at a depth of 20 meters at a construction site in Ho Chi Minh city. The deviations of the top point that are observed by the two methods are -4.37 millimeters and -3.69 millimeters on the X-axis and the Y-axis, respectively. The corrected observed results prove that the integrated solution has a good efficiency in monitoring the horizontal displacement of diaphragm walls. The bottom point observed by an inclinometer is unconfident enough to choose to be a reference point.
Źródło:
Inżynieria Mineralna; 2021, 2; 331--340
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doi moi – zmiany społeczno-ekonomiczne w Wietnamie: ich źródła, istota i rezultaty
Doi moi – social and economic changes in Vietnam: their sources, meaning and results
Autorzy:
Thi Thanh Thuy, Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/2022682.pdf
Data publikacji:
2009-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Opis:
The article focuses on the modernization of the Vietnamese socio-economic system according to the reform program known as „doi moi” (renovation). After presentation of the economic systems of the South Vietnam and the Democratic Republic of Vietnam until 1976, the author describes the economic situation of the country after unifi cation. She points that efforts made to integrate two completely different systems were unsuccessful and caused the social and economic crisis, which reached its peak in the mid-1980’s. To overcome the crisis, Vietnam launched in 1986 the political and economic campaign of reforms to facilitate the transition from the centralized socialist economy to the socialist-oriented market economy. Doi Moi combined government planning with free-market incentives and encouraged the establishment of private businesses and foreign investment, including foreign-owned enterprises. The economic reforms that introduced market forces in Vietnam resembled those initiated earlier in China. As the result of the doi moi, the economic situation in Vietnam began changing gradually: 1. The period 1989–1992 was a turning point; gradual reforms staved off the total collapse while maintaining the support of society. 2. In 1993–1997 increase in export and foreign investments resulted in the rapid development of economy. 3. After 1997 East Asian Financial Crisis the government control of the economy and the nonconvertible currency has protected Vietnam from more serious consequences. 4. By the beginning of the 21st century the doi moi has managed to transform Vietnamese economy into the export-oriented one – the success of the reforms was evident. The socio-economic achievements of Vietnam consist of the following: 1. privatization, 2. openness in trade and investment as well as integration of the domestic economy with the regional and world economies; 3. macro-economic, social and political stabilization.
Źródło:
Azja-Pacyfik; 2009, XII; 71-99
1643-692X
Pojawia się w:
Azja-Pacyfik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determine the Scope of Influence and Impact Due to Noise from Wind Turbines During the Operation of Wind Power Plant Project No. 3 – Soc Trang Province
Określenie zakresu oddziaływania turbin i oddziaływania hałasu z turbin wiatrowych podczas eksploatacji elektrowni wiatrowej projekt nr 3 – prowincja Soc Trang
Autorzy:
Nguyen, Hieu Minh
Thanh, Huong Nguyen Thi
Powiązania:
https://bibliotekanauki.pl/articles/2172074.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
wind power
noise
environmental impact
wind power plant project No. 3 - Soc Trang province
energetyka wiatrowa
hałas
oddziaływanie na środowisko
wind power plant project No. 3 - Soc Trang province Vietnam- (miasto Ho Chi Minh, Wietnam)
Opis:
Facing climate change, global warming and the depletion of fossil resources such as coal, oil, etc., the development of clean energy sources has become a global trend. Clean energy sources are being exploited and strongly developed globally today, including: solar energy, wind energy, geothermal energy, ocean wave energy, geothermal energy, biomass energy . Vietnam is located in the tropical monsoon climate, with a coastline stretching over 3,000 km, so the potential for wind energy development in Vietnam is extremely large, attracting a lot of investment in wind power projects in Vietnam. current and future, including wind power plant project No. 3 – Soc Trang province. So far, we have only mentioned the benefits and clean, renewable aspects of wind power, but few have mentioned the environmental and human health impacts of wind power plants, especially noise during operation. The paper uses WindPro software 3.1.597 to determine the extent of influence caused by noise emitted by wind turbines during the operation of wind power plants, thereby assessing its impacts on people's health. local people living around the project area and propose remedial measures
W obliczu zmian klimatu, globalnego ocieplenia i wyczerpywania się zasobów kopalnych, takich jak węgiel, ropa naftowa itp., rozwój czystych źródeł energii stał się światowym trendem. Czyste źródła energii są obecnie eksploatowane i silnie rozwijane na całym świecie, w tym: energia słoneczna, energia wiatru, energia geotermalna, energia fal oceanicznych, energia geotermalna, energia biomasy. Wietnam położony jest w tropikalnym klimacie monsunowym, z linią brzegową rozciągającą się na ponad 3000 km, więc potencjał rozwoju energetyki wiatrowej w Wietnamie jest niezwykle duży, co przyciąga wiele inwestycji w projekty wiatrowe w kraju. Przykładem omawianym a artykule jest elektrownia wiatrowa nr 3 – prowincja Soc Trang. Jak dotąd wspomnieliśmy tylko o korzyściach i czystych, odnawialnych aspektach energii wiatrowej, ale niewielu wspomniało o wpływie elektrowni wiatrowych na środowisko i zdrowie ludzi, a zwłaszcza emisji hałasu podczas pracy. W artykule wykorzystano oprogramowanie WindPro 3.1.597 do określenia stopnia oddziaływania hałasu emitowanego przez turbiny wiatrowe podczas pracy elektrowni wiatrowych, oceniając tym samym jego wpływ na zdrowie ludzi, lokalnych mieszkańców mieszkających w pobliżu obszaru objętego projektem i zaproponować środki zaradcze.
Źródło:
Inżynieria Mineralna; 2022, 2; 141--144
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theory Y in Modern Management: Advantages, Disadvantages, and the Relationship with Theory X
Autorzy:
Nguyen, Thanh Ha
Nguyen, Thi Thank Huyen
Nguyen, Thi Lan Huong
Powiązania:
https://bibliotekanauki.pl/articles/27323273.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
theory Y
theory X
management
strategy
organization
zarządzanie
strategia
organizacja
Opis:
This essay delves into the concept of Theory Y, one of the hallmark relationship management principles of the 20th century introduced by Douglas McGregor in his influential book "The Human Side of Enterprise" (1960). Theory Y assumes that employees are self-motivated, seek responsibility, and do not dislike work. The essay explores the advantages and disadvantages of Theory Y, highlighting its potential in nurturing creativity and maintaining employee satisfaction, but also addressing its limitations in certain situations. It examines successful examples of Theory Y implementation in companies like Facebook and Google, as well as the potential drawbacks such as freedom abuse and lack of organizational control. Additionally, the essay discusses the relationship between Theory Y and its counterpart, Theory X, which represents a more traditional, directive management style. By examining both theories, the essay emphasizes the importance of carefully considering and adapting management approaches based on the specific context and needs of an organization.
Źródło:
Inżynieria Mineralna; 2023, 2; 203--204
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rice Growth, Grain Zinc, and Soil Properties under Saline Irrigation Conditions
Autorzy:
Thi, Lan Phuong Dinh
Hang, Nga Nguyen Thi
Nguyen, Hoa Thanh
Nguyen, Lien Thi
Powiązania:
https://bibliotekanauki.pl/articles/1955578.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
salt stress
rice growth
nutrient zinc
irrigation water
salt accumulation
Opis:
This research evaluated rice growth and yield as well as Zn accumulation in both soil and grain under saline water irrigation conditions. The experiment consisted of a series of pots containing rice plants and paddy soil, with the application of irrigation treatments of five different salinity levels (1.5, 2, 3, 4, and 5‰ with a drip irrigation system). The results show that the salinity accumulation levels in soil can increase by up to 2.8‰ following the application of 5‰ salinity irrigation water during the development stages. Besides, this study also aimed to evaluate the influences of saline water irrigation on the observed rice yields, plant height, leaf length, and leaf width. In the results, irrigation with 3‰ saline water reduced potential rice yield by 58.6% and the length of rice leaves by one-third. Higher salinity of 4‰ in the irrigation water produced only 24% of average potential productivity, and 5‰ water salinity resulted in no yield. Furthermore, salt stress limited the mobile Zn content in paddy soil, reducing the Zn accumulation in grains by between 36.27% and 83.21%. Thus, the study shows that controlling salinity in irrigation water management is essential for controlling the yield and nutrient Zn content in rice grains.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 59-70
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Copper Removal by Photovoltaic Electrocoagulation from Aqueous Solution Using Response Surface Methodology Towards Sustainable Development
Autorzy:
Thanh, Hoa Nguyen
Nguyen, Lien
Lan, Phuong Dinh Thi
Powiązania:
https://bibliotekanauki.pl/articles/123109.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
photovoltaics
electrocoagulation
copper
Box-Behnken design
energy consumption
lithium battery
sustainable development
Opis:
This research aims at illustrating the optimal functions of removing copper ions in aqueous solution by means of the electrocoagulation process in which portable solar power generators are used as renewable energy. A solar photovoltaic cell (PV), producing approximately 48A current intensity for 4-7 h per day, was sufficient to charge the lithium batteries completely during the day. This system was connected directly to the electrocoagulation tank. The Box-Behnken design (BBD) was applied to evaluate three effects of process factors: current density, the dose of electrolyte (NaCl), and application time. The results showed that an optimal efficiency of 99.01% Cu removal plus an energy savings of 1.039 kWh/m3 were obtained at a current density of 4 A/m2, the dosage of NaCl (electrolyte) of 1.87 g/L, and electrolysis time of 10 min. The chemical components of the sludge produced under these optimized conditions were determined by means of EDX. It was illustrated that the copper ions were the main elements of sludge, and nonhazardous compounds were contained. The PV-lithium battery system is considered to be an efficient alternative energy source toward sustainable development.
Źródło:
Journal of Ecological Engineering; 2019, 20, 7; 103-111
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impacts of Financial Inclusion on Economic Development: Cases in Asian‑Pacific Countries
Wpływ włączenia finansowego na rozwój gospodarczy: przykłady krajów Azji i Pacyfiku
Autorzy:
Van, Dinh Thi Thanh
Linh, Nguyen Ha
Powiązania:
https://bibliotekanauki.pl/articles/632962.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Azja
konto
bankomaty
bank
kredyt
rozwój gospodarczy
włączenie finansowe
Asia
account
ATMs
credit
economic development
financial
inclusion
Opis:
Działania na rzecz włączenia finansowego mają na celu zapewnienie wszystkim podmiotom funkcjonującym w gospodarce dostępu do odpowiednich usług finansowych i możliwości ich efektywnego wykorzystania. Zwiększenie włączenia finansowego stało się poważnym problemem zarówno dla krajów rozwiniętych, jak i rozwijających się. Istnieje wiele wskaźników włączenia finansowego, z których najbardziej podstawowym jest posiadanie konta w instytucji finansowej. Niniejszy artykuł ma na celu ocenę wpływu wskaźników włączenia finansowego na rozwój gospodarczy. Wyniki badań pokazują, że istnieją korelacje między dużą liczbą oddziałów banków, bankomatów, kredytu krajowego w sektorze prywatnym a wzrostem tempa rozwoju gospodarki. Rozwój ten umożliwi wzrost poziomu życia ludności. W artykule przedstawiono także zalecenia dla rządów krajów rozwijających się służące zwiększeniu włączenia finansowego.
Financial inclusion efforts seek to ensure that all members of an economy can have access to and effectively use appropriate financial services. Improving financial inclusion has become a significant concern for developed and developing countries alike. There are many indicators of financial inclusion, the most elementary of which includes having an account in a financial institution. This paper will evaluate the impact of indicators of financial inclusion on economic development. The result shows that correlations exist between large numbers of bank branches, ATMs, domestic credit in the private sector and the increased rate of development in the economy. People will gain a more prosperous life due to this development. The paper also provides recommendations for the governments of developing countries to improve financial inclusion.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2019, 22, 1; 7-16
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use and Potential Impacts of Pesticides in Chili Farming in the Thanh Binh District, Dong Thap Province, Vietnam
Autorzy:
Mi, Le Thi Diem
Giao, Nguyen Thanh
Powiązania:
https://bibliotekanauki.pl/articles/2173321.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
frequency
chili farming
potential risk
pesticides
Dong Thap province
Opis:
The study aimed to evaluate the current status and potential risks of pesticide use of 23 chili growing households in the Thanh Binh district, Dong Thap province, Vietnam. The result shows that farmers used a total of 40 commercial pesticide names with 43 active ingredients, of which two active ingredients, i.e. Benomyl and Fipronil, were banned. The frequency of pesticide spraying for chili protection averaged at 8.93 times/crop, for weed control at 1.83 times/crop, for pests at 12.43 times/crop, for disease control at 14.48 times/crop and for chili growth promoting at 4.82 times/crop. Farmers sprayed pesticides with higher doses than recommended on the labels when pests and diseases occurred on chili farm. The active ingredients in powder and liquid pesticides of Mancozeb, Metalaxyl, Propined, Difenoconazole, Abamectin and Azoxystrobin have been frequently used with estimated concentrations of 5023±3886.36, 337.71±237.50, 4093.92±3628.57, 289.27±264.73, 31.60±29.02 and 652.57±468.35 g/L/ha, respectively. The predicted amounts of ineffective use of such pesticides as Benomyl, Cypermethrin, Fosetylaluminium, Propiconazole, Tebuconazole, Buprofezin, Chlorfenapyr and Difenoconazole, could pose great risks to the environment and humans. Burning is the main method chosen by chili farmers in the treatment of pesticide packaging after use. The study suggests local environmental managers should train farmers in the use and management of pesticide wastes more appropriately.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 1--11
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cadmium Immobilization in the Rice – Paddy Soil with Biochar Additive
Autorzy:
Thi, Khac Vu
Lan, Phuong Dinh Thi
Hang, Nga Nguyen Thi
Thanh, Hoa Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/2086382.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Cd
cadmium
soil contamination
rice grain
cadmium accumulation
biochar
straw
Opis:
Cadmium (Cd) is toxic for humans, but its effects on the yield and quality of rice under contaminated irrigation conditions remain uncertain. In this study, paddy soils in the Red River Delta (Vietnam) were selected for experiments with the purpose of understanding the effects of Cd contaminated irrigation water on growth, yields, and grain Cd accumulation. In addition, biochar was produced from rice husk (BRH) and rice straw for preventing Cd infiltration into rice was also studied in this experiment. A field experiment was established with applicated BRH and straw into polluted paddy soil, as a result the Cd content in grains reduced significantly. The Cd contaminated soil was added to the BRH and rice straw (RS) with six ratios, including: (1) RS 2.5%, (2) BRH 2.5%, (3) RS-BRH: 1.25–1.25%, (4) RS 5.0%, (5) BRH 5.0%, (6) RS-BRH: 2.5–2.5%, (w:w). Besides, three content levels 0.01–0.05–0.5 mg/L of Cd in irrigation water were applied throughout crop season. The results showed that the Cd accumulation in rice was in the following order: roots > stems > seeds. With 3 contaminated irrigation levels which were applied, the Cd concentrations of 0.05 mg/L and 0.5 mg/L affected plant height and yield. However, the Cd content in grains under contaminated soil condition can be controlled from 82.47–83.94% by applying a BRH ratio from 2.5–5% (w:w).
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 85--95
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of a Mobile Application-Based Intervention to Improve Knowledge and Practice Regarding Silicosis Among High-Risk Workers of Dust Exposure in a Northern Province of Vietnam
Autorzy:
Nguyen, Thi Thu Huyen
Ta, Thi Kim Nhung
Pham, Thi Quan
Nguyen, Thanh Thao
Nguyen, Ngoc Anh
Nguyen, Thi Lien Huong
Le, Thi Huong
Luong, Mai Anh
Le, Thi Thanh Xuan
Powiązania:
https://bibliotekanauki.pl/articles/27323251.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
knowledge
practice
workers
silicosis
mobile application
effectiveness
praca
aplikacja mobilna
Wietnam
Opis:
Objectives: to analyze changes in knowledge and practices regarding silicosis in groups of workers at high risk of silicosis before - after an intervention. Methods: The study was conducted from 2018 to 2019 based on structured questions related to knowledge and practices of silicosis of workers directly exposed to silica dust in a Northern province of Vietnam. The mobile app-based intervention was applied to steel workers, then compared with ironworkers in improvements in silicosis knowledge and practices. Results: Significant changes in the intervention group related to workers' knowledge about the signs suggestive of silicosis, disease consequences, measures to reduce the risk of silicosis, and participation in annual occupational disease examinations were reported. Conclusion: Mobile applicationbased interventions could improve silicosis knowledge and practice among workers at high risk of exposure to silica dust.
Źródło:
Inżynieria Mineralna; 2023, 2; 295--302
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological Risk Assessment for Occurrence of Toxic Elements in Various Land Use Types in Vietnamese Mekong Delta Province
Autorzy:
Nhien, Huynh Thi Hong
Mi, Le Thi Diem
Giao, Nguyen Thanh
Powiązania:
https://bibliotekanauki.pl/articles/2173267.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
An Giang
ecological risk
heavy metals
land use type
pollution index
Opis:
A total of 316 soil samples in the An Giang province were collected from the industrial zone (48 samples), mining (40 samples), farming (112 samples), landfills (88 samples) and cemeteries (28 a samples) to analyze toxic elements, including Cu, Zn, Pb, Cd and As. The geoaccumulation index (Igeo), pollutant load index (PLI) and potential ecological risk index (RI) were used to assess pollution levels and ecological risks. The results showed that the concentrations of heavy metals were almost still within the allowable limits of national standards. Cd was not detected. Heavy metals were detected in the soil in the following order: As < Pb < Cu < Zn, mining < industrial < landfill < cultivation < cemetery areas. The heavy metals contributing to soil environmental variability were similarly identified in the cemetery with industry and landfill with farming. The value of Igeo shows that As has a high potential to accumulate in soil in all land uses. The ranges of PLI values presented that the soil in industrial, farming, mining and landfills areas were classified moderate, while the cemetery areas has been rated at a high level. The RI values identified very high, high, and moderate ecological risks for cemetery, industrial and farming land and landfill, mining, respectively. The combination of PLI and RI indices showed that the cemetery areas were at the highest levels of pollution and risk. The results of this study provide scientific information on pollution level and ecological risks in various land use types supporting environmental zoning and managing strategies in the An Giang province.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 121--130
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emission Reduction in Oil & Gas Subsurface Characterization Workflow with AI/ML Enabler
Autorzy:
Thanh, Thuy Nguyen Thi
Lee, Samie
Nguyen, The
Duyen, Le Quang
Powiązania:
https://bibliotekanauki.pl/articles/27323253.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
CO2 emission
net zero carbon
machine learning
CCUS
digital transformation
emission reduction
digital subsurface workflow
emisja CO2
transformacja cyfrowa
redukcja
Opis:
According to (McKinsey & Company, 2020), drilling and extraction operations are responsible for 10% of approximately 4 billion tons of CO2 emitted yearly by Oil and Gas sector. To lower carbon emissions, companies used different strategies including electrifying equipment, changing power sources, rebalancing portfolios, and expanding carbon-capture-utilization-storage (CCUS). Technology evolution with digital transformation strategy is essential for reinventing and optimizing existing workflow, reducing lengthy processes and driving efficiency for sustainable operations. Details subsurface studies take up-to 6–12 months, including seismic & static analysis, reserve estimation and simulation to support drilling and extraction operations. Manual and repetitive processes, aging infrastructure with limited computing-engine are factors for long computation hours. To address subsurface complexity, hundred-thousand scenarios are simulated that lead to tremendous power consumption. Excluding additional simulation hours, each workstation uses 24k kWh/month for regular 40 hours/month and produces 6.1kg CO2. Machine Learning (ML) become crucial in digital transformation, not only saving time but supporting wiser decision-making. An 80%-time-reduction with ML Seismic and Static modeling deployed in a reservoir study. Significant time reduction from days-tohours-to-minutes with cloud-computing deployed to simulate hundreds-thousands of scenarios. These time savings help to reduce CO2-emissions resulting in a more sustainable subsurface workflow to support the 2050 goal.
Źródło:
Inżynieria Mineralna; 2023, 2; 289--294
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Investigation of High-Speed Train OFDM Systems under the Geometry-Based Channel Model
Autorzy:
Do, Viet Ha
Trinh, Thi Huong
Nguyen, Thanh Hai
Powiązania:
https://bibliotekanauki.pl/articles/1844506.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-speed train systems
geometry-based channel models
OFDM systems
SINR
capacity
Opis:
The high-speed of train (HST) in combination with the high carrier frequency of HST systems leads to the severe inter carrier interference (ICI) in the HST orthogonal frequency division multiplexing (HST-OFDM) systems. To avoid the complexity in OFDM receiver design for ICI eliminations, the OFDM system parameters such as symbol duration, signal bandwidth, and the number of subcarriers should be chosen appropriately. This paper aims to propose a process of HST-OFDM system performance investigation to determine these parameters in order to enhance spectral efficiency and meet a given quality-of-service (QoS) level. The signal-to-interference-plus-noise ratio (SINR) has been used as a figure of merit to analyze the system performance instead of signal-to-noise ratio (SNR) as most of recent research studies. Firstly, using the non-stationary geometry-based stochastic HST channel model, the SINR of each subcarrier has been derived for different speeds of the train, signal bandwidths, and number of subcarriers. Consequently, the system capacity has been formulated as the sum of all the single channel capacity from each sub-carrier. The constraints on designing HST-OFDM system parameters have been thoughtfully analyzed using the obtained expressions of SINR and capacity. Finally, by analyzing the numerical results, the system parameters can be found for the design of HST-OFDM systems under different speeds of train. The proposed process can be used to provide hints to predict performance of HST communication systems before doing further high cost implementations as hardware designs.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 451-457
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geotechnical Properties of Soft Marine Soil at Chan May Port, Vietnam
Autorzy:
Nguyenn, Thi Nu
Nguyen, Thanh Duong
Bui, Truong Son
Powiązania:
https://bibliotekanauki.pl/articles/2020054.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
geotechnical properties
soft marine soil
Chan May port
właściwości geotechniczne
ziemia morska
Wietnam
Opis:
Soft marine soil deposit is distributed under the sea with many special properties. This type of soil is rarely researched in Vietnam because of the difficult geotechnical investigation under the sea level. In this paper, the experimental laboratories were performed to investigate the geotechnical properties of soft marine soil at Chan May port, Vietnam. The field investigation results indicate that the thickness of soft soil varies from a few meters to more than ten meters. Soft soil has a high value of water content, void ratio, and compressibility and a low value of shear strength. The compression index has a good relationship with water content, liquid limit, and dry unit weight. The unit weight, shear strength, and preconsolidation pressure increase with the increase of depth. These results show that the soil in the study area is unfavorable for construction activities
Źródło:
Inżynieria Mineralna; 2021, 2; 207--215
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation in Growth and Yield of Sacha Inchi (Plukenetia Volubilis L.) under Different Ecological Regions in Vietnam
Autorzy:
Van, Quang Vu
Thi, Ngoc Yen Pham
Thi, Tram Nguyen
Van, Muoi Nguyen
Van, Thanh Le
Thi, Bich Ngoc Vu
Thi, Bich Hong Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/2173335.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ecological region
growth
sacha inchi
selection
yield
Opis:
The sacha inchi seeds (Plukenetia Volubilis L.), collected from different ecological regions of Vietnam (the Northern Mountainous region, the North Central region, and Central Highlands Area), were sown in the spring crop (March 2020) in Gia Lam district, Hanoi city, Vietnam. The variety S18 was copyrighted by Ministry of Agriculture and Rural Developmentof Vietnam in 2019 as a special medicinal plant variety. During the period of 26 months after planting, the agronomical parameters, growth and development characteristics (leaf form, number of inflorescences per branches, number of female flowers per inflorescences, etc.), pests and diseases, yields and yield components (number of seeds per fruit, seed weight, seed grain, etc.), ratio of kernel per seed and ratio of oil per seed were evaluated. The evaluation results show that the collected sacha inchi lines have a time from sowing to flowering and fruiting of 108–125 days, a fruiting to ripening of 123–125 days, and a time from sowing to harvesting the first batch of 244–250 days. The annual harvest is carried out at two main times: May–June and November–January. The actual yield of the first two periods is high (2.66–3.07 tons per hectare), and the highest yield is collected in the Northern Mountainous area is 3.07 tons per hectare (in Tuyen Quang province), while and 3.01 tons per hectare are collected in the North Central region (in Thanh Hoa province). In the nursery, root rot caused 2.1–5.3% deaths and green wilt caused 3.1–4.8% deaths of seedlings. In the planting garden, fruit borers, stem borers, cavity worms and red spiders were discovered, causing more serious damage than other types (from 5 to over 50%). The results of evaluation of growth, development, yield components and yield showed that the sacha inchi lines collected in the North Central region (in Thanh Hoa province) and the Northern Mountainous region (in Tuyen Quang province) is the best.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 162--169
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intention of the Households in Domestic Waste Classification in Vinh Chau Town, Soc Trang Province, Vietnam
Autorzy:
Giao, Nguyen Thanh
Kiet, Nguyen Tuan
Nhien, Huynh Thi Hong
Phuc, Son
Powiązania:
https://bibliotekanauki.pl/articles/2202374.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
domestic solid waste
household
intention to segregate garbage
Vinh Chau town
Soc Trang province
Opis:
The study was conducted to determine the factors affecting the intention of people to segregate garbage in Vinh Chau town, Soc Trang province, Vietnam by surveying 198 households. Cronbach’s alpha analysis method, EFA analysis, and linear regression analysis were used in the study. The analysis results of Cronbach’s Alpha index, KMO and Bartlett's test showed that the questionnaire data used in the study was highly reliable and were suitable for EFA analysis. The results of linear regression analysis identified three factors including "subjective norm", "control of cognitive behavior" and "perceived level of garbage classification information" that had positive impact on intention of domestic solid waste classification of local people in Vinh Chau town, Soc Trang province, in which "subjective norm" was considered to be the most influential factor on the intention to classify domestic solid waste in the study area. Besides, the intention of the people to segregate the domestic solid waste was highly appreciated, but it has not been widely implemented in the locality. Therefore, the study proposed some governance implications based on the factors affecting the intention of people to classify household solid wastes. In particular, local authorities should pay special attention to propagating and disseminating policies and guidelines on the information of domestic solid waste and implementing a model of waste segregation at source.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 1--11
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of financial development on economic stability: evidence from asian countries
Wpływ rozwoju finansowego na stabilność gospodarczą: dowody z krajów azjatyckich
Autorzy:
Lee, Anh Hoang
Pham, An Ha Thi
Doan, Kim Thanh
Nguyen, Thanh Phuc
Powiązania:
https://bibliotekanauki.pl/articles/27315179.pdf
Data publikacji:
2023
Wydawca:
Politechnika Częstochowska
Tematy:
financial development
economic stability
Bayesian analysis
rozwój finansowy
stabilność gospodarcza
analiza Bayesowska
Opis:
In recent years, most empirical studies have explored the critical role of financial sector development in economic growth. However, the study of the relationship between the progress of the financial sector and the volatility of economic development has received very little attention. This study is the first attempt at assessing the impact of financial development on the economic stability of Asian countries. In this study, economic stability is assessed through several proxies, such as growth stability, inflation stability and exchange rate stability. Employing panel data of 22 Asian economies covering the period 2011-2019 and Bayesian analysis, the findings show that financial development significantly impacts the economic stability of Asian countries. Additionally, depending on different indicators of financial development, the impact on economic stability of countries will be different. Given these research results, policy implications for economic stability in Asian countries are proposed. Besides, to stabilize growth, the study also suggests that Asian countries need better control of the ratio of non-performing loans to the total credit of the economy.
W ostatnich latach większość badań empirycznych dotyczyła kluczowej roli rozwoju sektora finansowego we wzroście gospodarczym. Jednak badaniu związku między postępem sektora finansowego a zmiennością rozwoju gospodarczego poświęcono bardzo mało uwagi. Niniejsze opracowanie jest pierwszą próbą oceny wpływu rozwoju finansowego na stabilność gospodarczą krajów azjatyckich. W tym opracowaniu stabilność gospodarcza jest oceniana za pomocą kilku wskaźników, takich jak stabilność wzrostu, stabilność inflacji i stabilność kursu walutowego. Wykorzystując dane panelowe 22 gospodarek azjatyckich obejmujące lata 2011-2019 i analizę bayesowską, wyniki pokazują, że rozwój finansowy znacząco wpływa na stabilność gospodarczą krajów azjatyckich. Ponadto, w zależności od różnych wskaźników rozwoju finansowego, wpływ na stabilność gospodarczą krajów będzie różny. Biorąc pod uwagę te wyniki badań, zaproponowano wnioski dotyczące polityki stabilności gospodarczej w krajach azjatyckich. Poza tym, aby ustabilizować wzrost, zasugerowano również, że kraje azjatyckie potrzebują lepszej kontroli stosunku kredytów zagrożonych do całkowitego kredytu w gospodarce.
Źródło:
Polish Journal of Management Studies; 2023, 27, 1; 164--180
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Occurrence, Ecological and Health Risk of Heavy Metals in Agricultural Soil in the Hau Giang Province, Vietnam
Autorzy:
Hong, Tran Thi Kim
Dan, Truong Hoang
Giao, Nguyen Thanh
Powiązania:
https://bibliotekanauki.pl/articles/2173352.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
agricultural soil
ecological risk
health risk
Hau Giang province
Opis:
The study aimed to evaluate the occurrence of some heavy metals in agricultural soil in the Hau Giang province, Vietnam. The geographical accumulation index (Igeo), pollutant load index (PLI) and ecological risk index (RI) are used to assess the pollution levels and potential ecological risks due to the presence of heavy metals in agricultural soil. The results showed that the mean concentrations of Cu, Pb and Zn in the soil ranged from 16.25–40.32, 18.05–29.92 and 52.78–147.22 mg/kg, respectively, within the limits of QCVN 03-MT:2015/BTNMT. Cluster analysis showed that Pb originated from the process of using fertilizers, especially phosphate fertilizers in farming. Cu and Zn possibly share a common origin from the use of pesticides and fungicides in agricultural production. The Igeo value of Cu, Pb and Zn gradually increases in the order of Cu < Zn < Pb. The PLI (1.03–1.97) reflected that the soil in the study area is moderately polluted. The RI (14.80–25.33) represented a low potential ecological risk. In particular, position D3 had the highest level of pollution and risk among the study sites. Pb had the highest level of accumulation in soil with the highest single ecological risk factor; thus, measures should be taken to limit the source of Pb generation. The results of the study also indicated that ingestion route is the main exposure pathway by which heavy metals can be harmful to humans.
Źródło:
Journal of Ecological Engineering; 2022, 23, 9; 61--71
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Lettuce (Pistia stratiotes L.) as a Potential Material for Biogas Production
Autorzy:
Cong, Nguyen Van
Thanh, Tran Van
Kha, Le Thi Mong
Hoang, Nguyen Xuan
Powiązania:
https://bibliotekanauki.pl/articles/2105278.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water lettuce
anaerobic digestion
renewable energy
Opis:
This study evaluated the biogas production potential of water lettuce (Pistia stratiotes L.) by batch anaerobic digestion under in-vitro conditions. Twenty-one litre-plastic jars were used to conduct 4 replications over 75 days. The results showed that solution temperature, pH and Eh were suitable for biogas production. More than 50% of the obtained CH4 was formed within 17–42 days after incubation. The maximum daily CH4 production was 0.052 L/gVS, whilst the daily H2S concentration was low, with a maximum value of 28 ppm within 14–21 d after incubation. Moreover, the peak of daily biogas production was seen at day 16 with production of 0.12 L/gVS. The results highlight that water lettuce biomass can be potentially used to produce high quality biogas in anaerobic incubation.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 182--188
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new environmentally friendly chemical mechanical polishing method applied for surface finishing Ti-6Al-4V alloy
Autorzy:
Quang, Nguyen Minh
Quan, Nguyen Ngoc
Mai, Nguyen Trong
Thanh, Le Thi Phuong
Tung, Nguyen Tien
Tan, Tran Ngoc
Hai, Ha Thanh
Trinh, Nguyen Duy
Powiązania:
https://bibliotekanauki.pl/articles/28407325.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
chemical-mechanical polishing
hydrogen peroxide
TI-6AL-4V
silica
malic acid
Opis:
A new eco-friendly slurry has been developed for the chemical mechanical polishing process with a solution of malic acid, deionized water, and an oxidizing agent hydrogen peroxide (H2O2). The surface quality of Ti-6Al-4V workpieces with the proposed chemical mechanical polishing slurry with optimal parameters include oxidizers (H2O2), colloidal (SiO2) slurry, and deionized water by weight 8%, 45%, and 47% respectively, the pH concentration is adjusted 4 through the malic acid content present in the slurry. Experimental results obtained with the proposed chemical mechanical polishing method show a more improved surface quality than previous studies when applying for polishing Ti-6Al-4V alloy. The developed chemical mechanical polishing method's polishing results under optimal conditions obtain an ultra-fine surface quality with Ra = 0.696 nm over a measuring area of 53×70 μm2. X-ray photoelectron (XPS) and electrochemical measurements were used to study the chemical reaction mechanisms in the proposed chemical mechanical polishing process. The chemical mechanical polishing processes for the surface of the Ti-6Al-4V alloy workpiece with the H2O2 oxidizing agent showed high suitability with the reactants formed on the surface such as Ti, V, and Al oxide. With the proposed oxidant and the established chemical mechanical polishing slurry, the feasibility and surface quality of the super smooth Ti-6Al-4V workpiece formed after polishing were demonstrated. The established chemical mechanical polishing method shows high applicability in environmental protection and Ti-6Al-4V alloy ultra-precision machining industries.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 64--76
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 41

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