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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
Tytuł:
Design optimization of compliant mechanisms for vibration assisted machining applications using a hybrid Six Sigma, RSM-FEM, and NSGA-II approach
Autorzy:
Pham, Huy-Tuan
Nguyen, Van-Khien
Dang, Quang-Khoa
Duong, Thi Van Anh
Nguyen, Duc-Thong
Phan, Thanh-Vu
Powiązania:
https://bibliotekanauki.pl/articles/24084644.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
compliant mechanism
multi-objective optimisation
Six Sigma
NSGA-II
Opis:
Vibration-assisted machining, a hybrid processing method, has been gaining considerable interest recently due to its advantages, such as increasing material removal rate, enhancing surface quality, reducing cutting forces and tool wear, improving tool life, or minimizing burr formation. Special equipment must be designed to integrate the additional vibration energy into the traditional system to exploit those spectacular characteristics. This paper proposes the design of a new 2-DOF high-precision compliant positioning mechanism using an optimization process combining the response surface method, finite element method, and Six Sigma analysis into a multi-objective genetic algorithm. The TOPSIS method is also used to select the best solution from the Pareto solution set. The optimum design was fabricated to assess its performance in a vibration-assisted milling experiment concerning surface roughness criteria. The results demonstrate significant enhancement in both the manufacturing criteria of surface quality and the design approach criteria since it eliminates modelling errors associated with analytical approaches during the synthesis and analysis of compliant mechanisms.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 135--158
1895-7595
2391-8071
Pojawia się w:
Journal of Machine 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:
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:
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:
Identifying Key Parameters Influencing Soil Quality at Various Depths in Tram Chim National Park, Dong Thap Province, Vietnam
Autorzy:
Giao, Nguyen Thanh
Nhien, Huynh Thi Hong
Dan, Truong Hoang
Ni, Duong Van
Powiązania:
https://bibliotekanauki.pl/articles/2202379.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
soil quality
national park
organic matter
alkaline soil
multivariate analysis
Opis:
This study used multivariate statistics including cluster analysis (CA) and principal component analysis (PCA) to evaluate the variability and key indicators causing changes in soil quality in Tram Chim National Park, Dong Thap province, Vietnam. Soil samples were collected in the dry season at the habitats of Ischaemum rugosum (CM), Panicum repens (CO), Nelumbo nucifera (LS), Eleocharis dulcis (NO), Oryza rufipogon (LM), Rice field (RL), Melaleuca cajuputi (T) in two layers: A (0–20 cm) and B (20–40 cm). The parameters of pH, total nitrogen (TN), total phosphorus (TP), total acidity (TA), organic matter (OM), total iron (Fe) and exchanged aluminum (Al3+) were used to assess soil quality. The results showed that soil pH was low in both A and B layers. Fe and Al were both high, and the concentrations of these metals in layer A were higher than those in layer B. The OM content was medium while the TN and TP levels were very low. Most of the soil quality indicators tended to decrease with the depth (except for TA). The results of CA analysis showed that there was almost no major change in soil quality between the two soil layers; however, the soil quality in rice field habitat was different from other habitats. The cause may be due to human impact in adding fertilizers/pesticides during farming practices. The PCA results showed at least five influencing factors, explaining 99.7% and 99.9% of soil quality variation in A and B layers. The Al3+, TA, OM, and TP parameters had the main influence on the soil quality of layer A. Meanwhile, the pH, Al3+, TA, TN, Fet indicators had influence on the soil quality of layer B. These indicators need to be future surveyed to assess the evolution of soil quality in the study area.
Źródło:
Journal of Ecological Engineering; 2023, 24, 2; 81--91
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:
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:
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:
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:
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:
Analysis of Spatial-Temporal Variations of Surface Water Quality in the Southern Province of Vietnamese Mekong Delta Using Multivariate Statistical Analysis
Autorzy:
Hong, Tran Thi Kim
Viet, Le Hoang
Giao, Nguyen Thanh
Powiązania:
https://bibliotekanauki.pl/articles/2173256.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
surface water
organic pollution
multivariate statistical analysis
Tien Giang province
Opis:
The study aimed to assess the variation in surface water quality in the Tien Giang province, Vietnam, and at the same time identify the main sources of water pollution. The surface water quality samples were collected at 34 locations (NM01-NM34) with 17 surface water quality indicators in March, June, September and November in canals and rivers in the Tien Giang province. Multivariate statistical analysis methods, including principal component analysis (PCA), cluster analysis (CA) and numerical discriminant analysis (DA), were used to analyze the variability and key indicators affecting the effect of multivariate statistical analysis. The analysis results show that the surface water quality in the study area is contaminated with organic (low DO, high BOD and COD) and nutrients (NH4+-N, NO2--N, PO43--P and TP), salinity (high Cl-). The PCA results showed that 14/17 surface water environmental parameters to be monitored are pH, temperature, TSS, BOD, COD, NH4+-N, NO2--N, PO43--P, TP, SO42-, Cl-, coliform and Fe. The PCA analysis showed that PC1-PC4 accounted for 79.70% of the variation in surface water quality in the study area. Potential surface water polluting sources include hydrological regime, domestic waste, agricultural production, industrial production activities. The CA results showed that 34 monitoring locations can be reduced to 27 locations, with a frequency of 4 times/year to ensure surface water quality representativeness. The DA indicated that the indicators of EC, SO42- and Cl- made the difference of the surface water quality between the wet and dry seasons. The current results provide important information on the current state of water quality for different uses and contribute to the improvement of the surface water quality monitoring system in the Tien Giang province.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 1--9
2299-8993
Pojawia się w:
Journal of Ecological Engineering
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:
Business strategy during Covid pandemic event: survival plans of instant coffee manufacturers in Vietnam
Strategia biznesowa podczas pandemii Covid: plany przetrwania producentów kawy natychmiastowej w Wietnamie
Autorzy:
Tran, Van Nguyen An
Do, Thi Thanh Nhan
Novak, Petr
Powiązania:
https://bibliotekanauki.pl/articles/27315189.pdf
Data publikacji:
2022
Wydawca:
Politechnika Częstochowska
Tematy:
covid pandemic
business strategy
instant coffee
pandemia Covid
strategia biznesowa
kawa rozpuszczalna
Opis:
In Vietnam, the covid situation started in the beginning of 2020 but not until May 2021, it severely impacts the country economically and socially. Some of the top instant coffee producers in Vietnam are struggling to calibrate their business decision-making to survive but others are taking advantage of the situation and fetch for opportunistic expansion. The theoretical framework initiates a global examination in the coffee industry to seek understandings through different business approaches from international organizations against the pandemic and determines dominant components succor firms to overcome adversities. Specifically, this study focuses on understanding the business strategies of Vietnam instant coffee manufacturers using business case study and unstructured interview. The result unveils that for the company survival plan categorizes into three directions: expanding, hibernating, and idling tactic. The paper suggests that during the pandemic event, the business decision-making highly relates to the degree of automation and liquidation. Furthermore, the study suggests that the decision of whether to embrace vertical or horizontal acquisition tactic during this period is a dependent variable with the magnitude of synchronization among the firm sub-business ecosystem. The study, hence, suggested instant coffee manufacturer to establish a set of backup plan in case of unexpected pandemic occasions by improving their automation degree and upgrading its liquidation channels.
W Wietnamie sytuacja krukowa zaczęła się na początku 2020 r., ale dopiero w maju 2021 r. ma poważny wpływ na gospodarczo i społecznie kraj. Niektórzy z czołowych producentów kawy rozpuszczalnej w Wietnamie walczą o dostosowanie swoich decyzji biznesowych, aby przetrwać, ale inni wykorzystują sytuację i szukają oportunistycznej ekspansji. Ramy teoretyczne inicjują globalne badanie branży kawowej w celu znalezienia zrozumienia poprzez różne podejścia biznesowe organizacji międzynarodowych przeciwko pandemii i określają dominujące elementy, które pomagają firmom przezwyciężać przeciwności losu. W szczególności niniejsze badanie koncentruje się na zrozumieniu strategii biznesowych wietnamskich producentów kawy rozpuszczalnej przy użyciu studium przypadku biznesowego i nieustrukturyzowanego wywiadu. Wynik pokazuje, że plan przetrwania firmy dzieli się na trzy kierunki: taktyka ekspansji, hibernacji i bezczynności. Artykuł sugeruje, że podczas pandemii podejmowanie decyzji biznesowych w dużym stopniu zależy od stopnia automatyzacji i likwidacji. Ponadto badanie sugeruje, że decyzja, czy przyjąć taktykę pionowego lub poziomego przejęcia w tym okresie, jest zmienną zależną o wielkości synchronizacji między ekosystemem podfirmowym firmy. Badanie sugerowało zatem producentowi kawy rozpuszczalnej ustalenie planu awaryjnego na wypadek nieoczekiwanych sytuacji pandemii poprzez poprawę stopnia ich automatyzacji i unowocześnienie kanałów likwidacji.
Źródło:
Polish Journal of Management Studies; 2022, 25, 2; 357--374
2081-7452
Pojawia się w:
Polish Journal of Management Studies
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
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