Dong Thap Province Research Articles

Application of 2D hydro-dynamic model to simulate the suspended sediment on the Tien river, Cao Lanh district, Dong Thap province

Application of 2D hydro-dynamic model to simulate the suspended sediment on the Tien river, Cao Lanh district, Dong Thap province

Fluctuation of Water Regime and Its Influence on Surface Water Quality in Tram Chim National Park, Dong Thap Province, Vietnam

Fluctuation of Water Regime and Its Influence on Surface Water Quality in Tram Chim National Park, Dong Thap Province, Vietnam

Stress situation and associated factors among nursre in clinical departments at Sa Dec General Hospital, Dong Thap province, in 2021

Objectives: Nursing is an occupation that has high levels of stress. This study was to find out the degree of work-related stress among nurses and some associated factors at Sa Dec General Hospital, Dong Thap province in 2021. Methods: This cross-sectional survey design study was conducted with the participation of 200 nurses in clinical departments of the Sa Dec General Hospital, Dong Thap province, in 2021. Results: 29% of nurses had stress. Divided by four levels of stress, 17.0% nurses had mild stress, 7.0% had moderate stress, 3.0% had severe stress and 2.0% had extremely severe stress. Some factors of job characteristics were associated to the stress’s nurses: work overload; high intensity workplace; a large number of patients requiring care per day; witnessing the patient’dead dying and pain. Working environment factors were associated with increased stress of nurses: facilities and work equipment; cramped space; working in a noisy workplace; working in conditions of extreme heat; being disrespected, no opportunities for further professional learning. Conclusions: The hospital need to ensure a suitable workload for nurses and to avoid exceeding the capacity of the nurse. Workplace condition in hospital should be improve. Keywords: Nursing, clinical department, hospital, mental health, stress.

The process of developing professional capacity for teachers

The primary aim of Vietnam's new educational program is to enhance students' knowledge and skills through practical learning experiences, enabling them to tackle academic and real-world challenges. However, teachers in Dong Thap province face limitations in their professional competencies. Thus, this study aims to address these issues by examining different models for developing teachers' professional competencies. 1,116 participants participated in this study (258 managers and 868 teachers from high schools and preschools) who completed two questionnaires assessing their professional competence and the perceived importance of professional development. The findings reveal that teachers lack subject knowledge, interdisciplinary understanding and skills in teaching design and assessment. Both school managers and teachers recognize the necessity of professional competence development. A three-step process for enhancing teachers' professional competence is proposed for implementing professional development activities based on these findings.

An IoT System and MODIS Images Enable Smart Environmental Management for Mekong Delta

The smart environmental management system proposed in this work offers a new approach to environmental monitoring by utilizing data from IoT stations and MODIS satellite imagery. The system is designed to be deployed in vast regions, such as the Mekong Delta, with low building and operating costs, making it a cost-effective solution for environmental monitoring. The system leverages telemetry data collected by IoT stations in combination with MODIS MOD09GA, MOD11A1, and MCD19A2 daily image products to develop computational models that calculate the values land surface temperature (LST), 2.5 and 10 (µm) particulate matter mass concentrations (PM2.5 and PM10) in areas without IoT stations. The MOD09GA product provides land surface spectral reflectance from visible to shortwave infrared wavelengths to determine land cover types. The MOD11A1 product provides thermal infrared emission from the land surface to compute LST. The MCD19A2 product provides aerosol optical depth values to detect the presence of atmospheric aerosols, e.g., PM2.5 and PM10. The collected data, including remote sensing images and telemetry sensor data, are preprocessed to eliminate redundancy and stored in cloud storage services for further processing. This allows for automatic retrieval and computation of the data by the smart data processing engine, which is designed to process various data types including images and videos from cameras and drones. The calculated values are then made available through a graphic user interface (GUI) that can be accessed through both desktop and mobile devices. The GUI provides real-time visualization of the monitoring values, as well as alerts to administrators based on predetermined rules and values of the data. This allows administrators to easily monitor the system, configure the system by setting alerting rules or calibrating the ground stations, and take appropriate action in response to alerts. Experimental results from the implementation of the system in Dong Thap Province in the Mekong Delta show that the linear regression models for PM2.5 and PM10 estimations from MCD19A2 AOD values have correlation coefficients of 0.81 and 0.68, and RMSEs of 4.11 and 5.74 µg/m3, respectively. Computed LST values from MOD09GA and MOD11A1 reflectance and emission data have a correlation coefficient of 0.82 with ground measurements of air temperature. These errors are comparable to other models reported in similar regions in the literature, demonstrating the effectiveness and accuracy of the proposed system.

Production techniques and environmental management in frog farming in Dong Thap province

This study surveyed 40 farmers on their production techniques and environmental management in frog farming in Cao Lanh and Thap Muoi district, Dong Thap province, and the results showed that frogs were cultured in tarpaulin tanks (82.5%), hapas in an earth pond (35%), and earth ponds (2.5%). Most of the farmers (82.5%) had a combination of breeding frogs and production frogs to be self-sufficient froglet. Stocking density is high with 146.3±92.3 individuals/m2 for production frogs and 51.6±35.7 individuals/m2 for breeding frogs. The culture duration of froglet was an average of 33.6±8.8 days/crop (9.3±2.4 crops/year) and production frogs was 64.7±9.7 days/crop (5.1±0.6 crops/year). Frogs were raised with a commercial pellet feed of many brands. The diseases occurred in tadpole and froglet phase (2-30 days), including septicemia diseases (57.5%), red thighs (45%), white bodies (35%), blindness (35%), digestive disorders (20%), and flatulence (15%). The disease causes were mainly due to poor water quality, weather change, feed, and high stocking density. However, few farmers had treated farming system (37.5%), supplemental water (27.5%), and monitored and controlled water quality. There were 60% of households to discharge wastewater directly into rivers and canals. Some farmers have used nutrient for wastewater from frogs with combining frog with fish (27.5%), or discharging wastewater into ditches gardens, fields (7.5%), settling pond (5%), which have helped to increase income and protect the environment. Therefore, farmers need to be supported with knowledge of farming technique and environmental management from the local government.

Tree age affects soil physico-chemical properties of mango orchard in Dong Thap province

The study was carried out to investigate the effect of tree age to soil physical and chemical characteristics of mango orchard. Effect of 4 different tree ages (<10, 10 - 20, 21 – 30, and over 30 years) on soil physic-chemical properties of farmers’ Mango field in Dong Thap province. The research was handled from June to November 2021. Soil samples at two depths (0 - 20 and 20 - 50 cm) were collected from the tree basin and were subjected to laboratory analysis from November to December 2021. Data showed that soil properties varied across mango tree’ age and depths. Bulk density was higher in over 10-year-old tree and soil texture of silty clay-loam represented in the whole observed orchards. The results showed that the chemical properties of the soils were characterized by the low to rather low pH values (4.0 - 6.0) of the topsoil and tended to decrease gradually with depths and tree ages. Unimpacted EC (electrical conductivity) in mango orchards was recorded, while total N, P, K, soil organic carbon and CEC tended to decrease with tree age and depths. These values declined for 10 years old onwards for both depths of 0 - 20 and 20 - 50 cm.

Nhân tố ảnh hưởng đến hiệu quả kinh doanh các doanh nghiệp nhỏ và vừa tại tỉnh Đồng Tháp

The study aims to examine the impact of factors affecting business performance in small and medium enterprises in Dong Thap province. The author conducted the research through two phases: qualitative research and quantitative research. In addition, the data analysis method was selected by the authors for Logistic regression analysis to analyze the current situation and factors affecting the business performance of enterprises. Research results show that: Policy mechanism is the factor that has the strongest impact on business performance of small and medium-sized enterprises, followed by the ability to react to the business environment; material and human resources; competitiveness of enterprises; access to capital and community responsibility. In addition, the author proposes some key solutions to help managers improve the business efficiency of small and medium enterprises in Dong Thap province.

Prevalence and predictors of depression, anxiety, and stress among recovered COVID-19 patients in Vietnam.

During the COVID-19 pandemic, a high prevalence of mental health distress has been reported among people who have recovered from the disease. To assess the prevalence of depression, anxiety, and stress as well as identify predictors among recovered COVID-19 patients after more than six months of being discharged in Dong Thap Province, Vietnam. The cross-sectional study was conducted among 549 eligible participants recruited by stratified sampling. Data was collected using the depression, anxiety and stress scale - 21 items had Content Validity Index = 0.9, and Cronbach's alpha for depression, anxiety and stress sub-scales were 0.95, 0.81, and 0.86, respectively. Descriptive statistics were used to measure the prevalence levels and distribution of characteristics of the participant, while factors influencing depression, anxiety, and stress were predicted using binary logistic regression. The overall prevalence of depression, anxiety, and stress were 24.8% (95% CI: 21.2-28.6), 41.5% (95% CI: 37.4-45.8), and 25.3% (95% CI: 21.7-29.2), respectively. The predictors of depression were living in urban area (OR = 1.97; 95% CI: 1.27-3.08), holding a bachelor's degree (OR:3.51; 95% CI: 1.13-10.8), having a high monthly income (OR: 2.57; 95% CI: 1.03-6.38), diabetes (OR: 2.21; 95% CI: 1.04-4.68), heart disease (OR: 3.83; 95% CI: 1.79-8.17), respiratory disease (OR: 3.49; 95% CI: 1.24-9.84), and diarrhea (OR: 4.07; 95% CI: 1.06-15.6). Living in the urban area (OR: 1.57; 95% CI: 1.07-2.29), having sleep disturbance (OR: 2.32; 95% CI: 1.56-3.46), and fatigue (OR: 1.57; 95% CI: 1.03-2.39) were predictors for anxiety. Having respiratory disease (OR: 3.75; 95% CI: 1.47-9.60) or diarrhea (OR: 4.34; 95% CI: 1.18-15.9) were predictors of stress. People who have recovered from COVID-19 should be assessed for symptoms of depression, anxiety, and stress. Primary healthcare providers should develop interventions to support their recovery.

Assessment of physical and chemical characteristics of bio-organic compost from seafood sludge

Seafood sludge (SS) was one of the solid wastes generated during the wastewater treatment processes of seafood processing factories, and it increasingly discharged to the environment. This study aimed to reuse sludge from seafood wastewater treatment plants for producing microbial-organic fertilizer to handle environmental pollution. SS samples were collected at seafood factories in Dong Thap province. Other materials, including sugarcane filter cake (SC) and bagasse (B) were collected in Hau Giang province. Five treatments with three replications for each consisted of a mixture ratio of SS, SC and B at (1) 10-60-30, respectively; (2) 10 + 70 + 20; (3) 20 + 60 + 20; (4) 10 + 70 + 20 and (5) 20 + 80 + 0. All composting mixtures were analyzed for temperature, moisture content, pH, electrical conductivity, volume reduction, organic carbon (OC), total nitrogen (TN), total phosphorus (TP) and total potassium (TK) at stages of 0 and 49 days after incubation. Results after 49 incubation days showed that the pH value of both kinds of sludge was slightly acid to neutral (6-7). Electrical conductivity values were suitable from 0.74 to 1.57 mS/cm. The weight loss of incubated samples was 35.87-77.56% after a 49-day incubation. Organic carbon contents were at a high level (over 30% C). After 49 incubation days, the TN, TP, and TK content were high at 2.01-3.03%N; 6.71-9.95%P2O5; and 2.62-3.15%K2O, respectively. The C/N ratio ranged from 12.15 to 19.1. The optimal ratio was mixed with 20% seafood sludge and 80% sugarcane filter cake. The period of 49 days was seen as the suitable incubation time for composting maturity and stability.

Isolation and characterization of indigenous microorganisms for antagonizing Fusarium incarnatum and preventing swollen swim bladder disease in Pangasius hypophthalmus

Fusarium incarnatum is known to cause swollen swim bladder disease in Pangasius hypophthalmus, leading to significant losses for aquaculture households. The objective of this study was to isolate local strains of microorganisms capable of antagonizing F. incarnatum, in order to reduce the use of antibiotics that may have adverse effects on both the environment and human health. Samples were collected from five Pangasius hypophthalmus fish, five water sources, and five sludge samples from fish ponds located in Lap Vo district, Dong Thap province. A total of 24 bacterial strains were isolated and subjected to the dual culture method to identify the 20 strains with the ability to antagonize F. incarnatum. The inhibitory ability of F. incarnatum was then evaluated using the two-culture method with the 20 selected strains. Results revealed that two strains, B19 (with a colony radius of 1.42 cm and corresponding inhibitory effect of 77.51% after 12 days) and B23 (with a colony radius of 1.55 cm and corresponding inhibitory effect of 75.40% after 12 days), demonstrated the strongest antagonistic effects against F. incarnatum. The identified strains were found to be Bacillus sp. (with a similarity of 90.22%) and Bacillus amyloliquefaciens (with a similarity of 92.41%). These results suggest that the use of Bacillus spp. can be an effective strategy to inhibit swollen swim bladder disease caused by F. incarnatum, and maybe a viable alternative to the use of antibiotics in the future.

Organizing the contest “Experiencing STEM in Natural Science” for students at Nguyen Tu Secondary School, Cao Linh City, Dong Thap Province

Experiencing is an activity that helps students approach reality, and directly experience by synthesizing existing knowledge and skills to perform tasks and solve problems. STEM education is a modern educational orientation, an educational model that is widely concerned and deployed around the world to adapt to industry 4.0. The contest “Experiencing STEM in Natural Science” is an activity aimed at fostering the quality, forming, and developing students' capacity based on STEM education for natural sciences. This experiential activity contributes to meeting the current requirements of the comprehensive educational reform and training high-quality human resources, capable of applying interdisciplinary knowledge to solve practical problems. The contest is both a learning environment and a creative playground, helping students develop their abilities, strengthen their passion for scientific research, and affirm their self-worth. The contest was held at Nguyen Tu Secondary School, Cao Lanh City, Dong Thap Province.

Realities on livelihood resources of poor households living along Tien River affected by landslide in Tan Binh and Tan Quoi Commune, Thanh Binh District, Dong Thap Province

On the realities of increasingly serious impacts of landslides on poor households along Tien River, it is necessary to do research about their livelihood resources, thereby proposing solutions to improve their living conditions. Research is conducted by direct survey questionnaire method of 135 households at the poverty level (poor, near-poor households and those with difficult circumstances) affected by landslides in Tan Binh and Tan Quoi Commune, Thanh Binh District, Dong Thap Province. The research result shows that most of their livelihood resources are deficient and mainly reliant on human capital, financial and social capital. To improve adaptive capacity of these households, the improvement of human, financial and social capital is an urgent solution to be invested and supported to them.

Groundwater quality assessment for drinking purposes: a case study in the Mekong Delta, Vietnam

Groundwater serves as an important resource for people in the Mekong Delta, but its quality has been continuously declined from human activities. Current status of the groundwater quality needs to be evaluated for sustainable groundwater resource management. This study aimed to evaluate the groundwater quality for drinking purposes in the Mekong Delta, Vietnam, using multivariate statistical methods and integrated-weight water quality index. Data comprised 8 water quality parameters (pH, total hardness, nitrate (NO3−), iron (Fe), lead (Pb), mercury (Hg), arsenic (As), and coliforms) obtained from 64 observation wells in An Giang province, Dong Thap province, and Can Tho city, were analyzed by cluster analysis (CA), principal component analysis (PCA), and integrated-weight water quality index (IWQI). The results indicated that most parameters were within standards while excessive hardness and Fe contamination were found in some regions. More than 80% of samples were detected with serious coliform contamination. The CA results revealed that groundwater quality heavily depend on geological locations with 4 clusters of the sampling locations. Three principal components obtained from PCA could explain 77.2% of the groundwater quality variation. The IWQI values ranging from 4 to 2761 classified groundwater quality as excellent (53.1%), good (25%), poor (9.4%), very poor (4.7%), and undrinkable (7.8%), which were associated with coliform contamination. These findings have provided insights into the groundwater quality status in the region, which can benefit in developing a water protection strategy.

Identifying Key Parameters Influencing Soil Quality at Various Depths in Tram Chim National Park, Dong Thap Province, Vietnam

Identifying Key Parameters Influencing Soil Quality at Various Depths in Tram Chim National Park, Dong Thap Province, Vietnam

MODELLING THE NEW BRAND EQUITY OF DESTINATION THEORY AND TRAVEL INTENTION: AN EMPIRICAL STUDY FROM VIETNAM

Purpose – There is a lack of research on the causal relationship between a tourism destination’s new brand equity and travel intention. This study aims to identify and explore the model of tourism destination new brand equity, validate and evaluate the relationships between tourism destination new brand equity elements and travel intention in the context of tourism destinations. Design – This study collected primary data from March to May 2021 based on a questionnaire survey of 589 domestic tourists traveling to Dong Thap province. The newly proposed conceptual framework was evaluated and validated using the PLS-SEM method. Findings – The main new findings of this study were the identification of the nine constructs of destination brand equity and their association with travel likelihood. The study revealed the effect of the new constructs of destination brand equity constructs on travel willingness, which can promote domestic tourism in Dong Thap province. Originality of the research – The current study can be considered as an important contribution to the theoretical and managerial implications for local authorities to understand the new model of destination brand equity from the perspective of domestic tourists. The findings of this study may increase travel intention and promote tourism in Dong Thap province.

Dynamic Study and Modelling of Arsenic Removal from Groundwater Using Ferromagnetic Carbon as Fixed Bed Adsorbent in Column

This study investigated the performance of Ferromagnetic Carbon (FC) as an effective natural adsorbent for arsenic removal from groundwater in Dong Thap Province (Vietnam). To do this, leaching fixed-bed column experiments have been carried out. The influence of operating variables affecting the process was studied, under varying operating conditions and experimental data were modelled using bed depth service time (BDST) and mass transfer approaches. Speciation studies showed that the groundwater contained 48.5% of particulate arsenic and 51.5% of soluble arsenic. Indeed, As (III) and As (V) forms represented respectively 41.9% and 58.1% in the dissolved arsenic. As removal was parametric depending such as pH, flow rate, initial As and adsorbent mass, requiring an optimization for optimum conditions When the pH increased from 3 to 11, removal of As(V) decreased from 96.5% to 5% while As(III) removal increased from 40% to 69%. The increase of initial arsenic has caused an increase in removal efficiency of different forms of arsenic. The easy regeneration of FC using a molar sodium hydroxide solution suggests that is an efficient and low-cost material to reduce the contamination of arsenic in drinking groundwater.

<span>Designing and organizing STEM education: “Dry hand sanitizer” topic by model 5E in grade 11 organic chemistry</span>

STEM education has been a vital educational trend in the world. Over the past few years, in Vietnam this approach has been practiced widely in the K-12 education to facilitate school students participation in experiential activities and apply knowledge to create products or solve practical problems. In this article, we briefly introduce STEM education and the 5E model to design and organize the topic of "dry hand sanitizing" in grade-11 organic chemistry. We performed the pedagogical experiment by organizing the extracurricular activities at Thien Ho Duong High School, Dong Thap province, and observing their worksheets and learning outputs. The obtained results initially show the efficiency of the proposed method.

Evaluate The Economic Efficiency of Agricultural Production Models: A Case Study in Thap Muoi District, Dong Thap Province

The study aims to evaluate the economic efficiency of the three-rice-crop and the two-lotus-crop model in Thap Muoi District, Dong Thap Province. The study data were collected from 158 farmers (98 households producing three rice crops per year, 60 remaining households plant two lotus crops per year) by stratified random sampling. The research result shows that both models above bring economic benefits to farmers. However, the two-lotus-crop model is less costly, the selling price is stable and tends to increase. Moreover, it takes advantage of idle labor in the family, so its economic efficiency is higher than the three-rice-crop model. Keywords: economic efficiency, three-rice-crop model, two-lotus-crop model.

Creation of Variation through In-vitro Mutagenesis using Gamma radiation in Rose (Rosa hybrida L.) Variety ‘Lửa’

Rosa hybrida L. var. Lửa has been one of the most important roses for a long time and is most often used for ornamental purposes in Sadec city, Dong Thap province. The study aimed to induce variation through in-vitro gamma-ray irradiation in the rose variety ‘Lửa’ for further improvement in rose breeding. In-vitro single node cuttings (25 in-vitro cuttings per treatment with four replications) were irradiated with different doses of γ-rays (0, 5, 10, 15, 20, 25, or 30 Gy) using a 60Co source (India) at Da Lat Nuclear Research Institute. The γ-irradiated explants were then cultured aseptically on Murashige and Skoog’s basal medium supplemented with 1.0 mg/L BAP to induce multiple shoots, shoot proliferation, and acclimatization at Division of Vegetables, Flowers and Landscaping of Southern Horticultural Research Institute (SOFRI). The LD50 dose was determined at 20 - 25 Gy treatments and these doses affected the multiplication rate, growth in-vitro, and ex-vitro survival rate. Three types of mutants with altered or novel flower color in comparison to the original flower color were isolated, such as Type 1 with orange-pink (Red 52C), Type 2 with pink (Red 54B), and Type 3 with Red 45AB with Red 54B bicolor.