Autor: Thuan, Nguyen Cong - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Assessment of Surface Water Quality in the Hau Giang Province Using GIS and Statistical Approaches
Autorzy:: Thuan, Nguyen Cong
Powiązania:: https://bibliotekanauki.pl/articles/2173356.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: GIS
geographical information system
multivariate statistics
water quality index
water supply
Opis:: The study aimed to assess the surface water quality in the Hau Giang province in 2021 at 44 locations (with a frequency of 5 times per year) using Principal Component Analysis (PCA), Cluster Analysis (CA) and GIS. Surface water quality was compared with the national technical regulation on surface water quality (QCVN 08-MT:2015/BTNMT, column A1) and Water Quality Index (WQI). The results showed that the surface water quality parameters of total suspended solids, organic matters, nutrients, coliform, and Fe far exceeded the allowable limits, while the Cl-, color, and CN- parameters were within the allowable limits of QCVN 08-MT:2015/BTNMT, column A1. The values of WQI showed that the water quality of the Hau Giang province ranged from poor to excellent. The water quality at the Vam Cai Dau and Hau River areas could only be exploited for water supply, but appropriate treatment is needed. CA divided the monitoring months into three distinct clusters and reduced the sampling sites from 44 to 33 locations, reducing 25% of monitoring cost per year. PCA revealed three main factors which could explain 69.0% of the variation in water quality. The water pollution sources were mainly industrial and agricultural discharges, domestic and urban activities, transportation activities, salinity, hydrological conditions and water runoff. The current findings provide useful information which support local environmental managers and water supply companies for safe and sustainable.
Źródło:: Journal of Ecological Engineering; 2022, 23, 9; 265--276
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Semi-Continuous Anaerobic Digestion of Water Hyacinth with Different Volatile Solid Levels for Biogas Production – A Mesocosm Experiment
Autorzy:: Thuan, Nguyen Cong
Khanh, Huynh Cong
Powiązania:: https://bibliotekanauki.pl/articles/2202361.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: renewable energy
semi-continuous anaerobic digestion
volatile solid
water hyacinth
Opis:: Water hyacinth (WH) biomass is one of the popular materials in the Vietnamese Mekong Delta, a potential substrate for biogas production. The effectiveness of utilizing WH for producing biogas under anaerobic digestion was demonstrated in the previous studies, but the research was focused on the loading rate of about 1.0% volatile solid (VS). Therefore, in the present study, a semi-continuous anaerobic digestion experiment was conducted with the five levels of VS, including 1.0%VS, 1.5%VS, 2.0%VS, 2.5%VS, and 3.0%VS, to examine how loaded VS can affect biogas production. Each treatment was designed with three replications over 60 days. The measured parameters included pH, temperature (Temp; °C), redox potential (Eh; mV), daily produced biogas volume (L), cumulative biogas volume (L), and methane (CH4) concentration (%) during the 60 days of the experiment. The obtained results showed that pH, tempt, and Eh parameters did not negatively affect biogas production. However, the volume of daily biogas in the treatment of 3.0%VS was higher than in other treatments. In addition, the cumulative biogas volume in the treatment of 3.0%VS was the highest and significantly different between all reactors (p<0.05). Meanwhile, the treatment of 1.0%VS was known with the lowest values. The study explored that the volume of biogas could be increased when the organic loading rate VS is increased.
Źródło:: Journal of Ecological Engineering; 2023, 24, 2; 230--237
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Methane Production from Food Garbage under the Batch and Semi-Continuous Anaerobic Digestion: Effect of Total Solid
Autorzy:: Thuan, Nguyen Cong
Tokihiko, Fujimoto
Ngan, Nguyen Vo Chau
Powiązania:: https://bibliotekanauki.pl/articles/24201722.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: batch digester
biogas
food garbage
semi-continuous digester
total solid
Opis:: In line with modern era, it is a high demand of renewable energies due to fossil fuels crisis. This study applies food garbage to produce biogas - an alternative renewable energy source – under lab-scale batch and semi-continuous reactors. Designing with four loading total solid (TS) rates of 1.0%, 1.5%, 2.0%, and 2.5%, the batch and the semi-continuous testing set up in 1.5 L and 21 L plastic reactors, respectively. Both testing was run in 60 days, produced biogas volume and compositions were recorded daily in semi-continuous reactors, and every ten days in the batch reactors. The results show that in batch testing, the biogas yields of treatments 1.0%TS, 1.5%TS, and 2.0%TS were better than those for treatment of 2.5%TS; however, %CH4 concentrations were better for treatments 2.0%TS and 2.5%TS. For the semi-continuous testing, the loading rate of 2.5% total solid food garbage produced the highest biogas yield which could meet the household demand of daily gas. Up to the day of 60, the %CH4 concentration was nearly 45% which proof the biogas can be used for cooking. H2S concentration in biogas was high which must be reduced to use produced biogas for cooking purpose. Further study needs to avoid accumulation of soluble organic acids, leading the low pH and inhibits methane-producing microorganisms in food garbage anaerobic reactor.
Źródło:: Journal of Ecological Engineering; 2023, 24, 4; 264--278
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Industry 4.0, lean management and organizational support : a case of supply chain operations
Przemysł 4.0, lean management i wsparcie organizacyjne : przypadek operacji łańcucha dostaw
Autorzy:: Tiep, Nguyen Cong
Oanh, Thai Thi Kim
Thuan, Tran Duc
Tien, Dinh Van
Ha, Thai Van
Powiązania:: https://bibliotekanauki.pl/articles/1826128.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska
Tematy:: supply chain operations reference model
Industry 4.0
lean management
organizational support
model odniesienia operacji łańcucha dostaw
Przemysł 4.0
szczupłe zarządzanie
wsparcie organizacyjne
Opis:: Currently, Industry 4.0 is considered as the essential improvement of business processes that could improve the lean management along with high organizational support and effective supply chain practices. Thus, the aim linked with the current article is to examine the role of Industry 4.0 in the business processes and its impact on lean management. The purpose also includes the investigation of mediation impact of supply chain operations reference model (SCORM) among the nexus of the role of Industry 4.0 in business process and lean management along with the examination of moderating role of organizational support among the nexus of SCORM and lean management. The researchers and questionnaires have selected the quantitative method of data collection have been used to gather the data from the respondents, while smart-PLS has been executed for analysis purpose. The results revealed that positive association had been found among the nexus of the role of Industry 4.0 in the business processes and lean management. The results also exposed that SCORM is positively mediating among the nexus of the role of Industry 4.0 in the business processes and lean management while organizational support positive moderated among the nexus of SCORM and lean management. These findings provided the guidelines to the policymakers that they should enhance their focus on the implementation of Industry 4.0 in the organization that could lead the organization towards success.
Obecnie Przemysł 4.0 uważany jest za zasadnicze usprawnienie procesów biznesowych, które mogłoby usprawnić szczupłe zarządzanie przy jednoczesnym wysokim wsparciu organizacyjnym i efektywnych praktykach łańcucha dostaw. Zatem celem związanym z niniejszym artykułem jest zbadanie roli Przemysłu 4.0 w procesach biznesowych i jego wpływu na lean management. Celem jest również zbadanie wpływu mediacyjnego modelu referencyjnego operacji łańcucha dostaw (SCORM) na splot roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, wraz z badaniem moderującej roli wsparcia organizacyjnego w powiązaniu SCORM i lean zarządzanie. Badacze i kwestionariusze wybrali ilościową metodę zbierania danych, która została wykorzystana do zebrania danych od respondentów, natomiast smart-PLS został wykonany do analizy. Wyniki ujawniły, że pozytywny związek został znaleziony wśród splotu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu. Wyniki pokazały również, że SCORM pozytywnie pośredniczy w powiązaniu roli Przemysłu 4.0 w procesach biznesowych i szczupłym zarządzaniu, podczas gdy wsparcie organizacyjne jest moderowane pozytywnie wśród powiązań SCORM i lean management. Ustalenia te dostarczyły wskazówek dla decydentów, że powinni oni skupić się na wdrażaniu Przemysłu 4.0 w organizacji, która może poprowadzić organizację do sukcesu.
Źródło:: Polish Journal of Management Studies; 2020, 22, 1; 583-594
2081-7452
Pojawia się w:: Polish Journal of Management Studies
Dostawca treści:: Biblioteka Nauki

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