The purpose of this study is to design a closed-loop supply chain network considering the processes of supplying and recovering used products. A Mixed Integer Linear Programming model (MILP) is proposed as an initial approach to the problem. Fluctuations in raw material prices and retailer demand within the chain supply are taken into account as uncertain factors in this research. To address the problem, Compromise Programming (CP) and Fuzzy Programming (FP) techniques are utilized, which involve transforming MILP model into a model known as Multi Objective Linear Programming (MOLP). A case study of household faucets is applied to test the model. Results indicate that the CP method effectively identifies the optimal level for the decision maker, and the expected value of the corresponding objective function is not significantly affected by the arbitrariness of the decision maker.

This study focuses on developing a low-cost absorbent, specifically modified biochar prepared from dragon fruit (Hylocereus sp.) branches to remove Cr(VI) in an aqueous solution. It was found that the activation process using nitric acid helped to improve the prepared biochar's surface properties, resulting in an increase in the adsorption capacity of Cr(VI) in an aqueous solution. Accordingly, the removal efficiency and adsorption capacity of Cr(VI) respectively reached 88.9% and 2.2 mg/g at the optimum condition: the absorbent dosage of 0.2 g, pH solution of 2, contact time of 90 minutes, and initial concentration of 10 mg/L. An equilibrium adsorption isotherm model and a kinetic model of Cr(VI) on the modified biochar from dragon fruit branches were fitted to experimental data. In comparison to Freundlich adsorption isotherm model, the data were well represented by the Langmuir adsorption isotherm model with a maximum adsorption capacity of 5.91 mg/g. Furthermore, the adsorption kinetic data were well described by the pseudo-second-order model with R2 of 0.9821, indicating a high agreement between experimental and calculated values.

Chalcone scaffolds play an important role in anticancer drug design. In this article, the chalcone derivatives containing heterocyclic moiety (quinazolinone, benzimidazole, benzoxazole and 1,3,4-oxadiazole) with potential anticancer activity have been reviewed on the prediction of DNA-binding. Compounds provided excellent results for DNA intercalation, compared with those of the standard at a molecular level. Molecular dynamics simulations were performed for the top four docked complexes, which indicated the structural stability of the DNA–ligand complexes. ADMET prediction was also performed for the top ligands. In summary, this study encouraged the synthesis of designed compounds and the study of their in vitro DNA interactive ability and cytotoxicity. This class of compounds might be helpful for the development of new and potential multi-target anticancer agents or drugs in the future.

The article studies differential properties in parametric optimal control with equilibrium constraints. The article obtains some new results on generalized differential properties in parametric optimal control problems governed by semilinear elliptic partial differential equations with equilibrium constraints. The new results of the article include formulas for computing the Fréchet coderivative and Mordukhovich coderivative of the constraint operator of the parametric optimal control problems with the perturbed equilibrium constraint form and formulas for computing Fréchet subdifferential of the marginal function of the parametric optimal control problems with equilibrium constraints.

This study aimed to prepare and evaluate the antioxidant effect of hydroxypropyl methylcellulose (HPMC) hydrogel containing metformin (HPMC-Met). Firstly, the UV-Vis spectroscopic quantitative method for metformin was established and validated at a wavelength of 233 nm, which possesses a standard curve of y = 0.8224x + 0.0194 (R2 = 0.9984) in a concentration range of 0.0625-2.0000 µg/mL, and satisfies the specificity, accuracy, and precision criteria. Next, the HPMC-Met was prepared and physicochemically evaluated, in terms of appearance, gelation time, viscosity, and drug release profile. Interestingly, these properties varied proportionally to the amount of HPMC and ethanol:water ratio. Furthermore, the metformin from HPMC-Met was released sustainably in phosphate buffered pH 5.5 during 150 mins. Finally, by using DPPH (2,2 diphenyl-1 picrylhydrazyl) antioxidant test, the IC50 of metformin and HPMC-Met was both approximately 70 µg/mL. In summary, the HPMC hydrogel might be a potential drug delivery system for metformin.

Sodium tripolyphosphate (STPP) is an additive widely used in seafood processing. High concentration of phosphate in seafood processing wastewater, if not treated, will cause eutrophication leading to algal blooms, thereby polluting water bodies and affecting public health. This study aimed at the isolation of bacteria in seafood processing wastewater capable of absorption and chemotaxis towards STPP. Twenty-seven bacterial strains able to absorb STPP were isolated from water samples taken at the wastewater treatment system of a seafood processing company in Soc Trang. Eleven strains, PAE1.1, PAE1.2, PAE1.4, PAE1.6, PAE1.7, PAN1.1, PAN1.12, PAN1.5, POU1.2, POU1.3, and POU1.4, showed high biomass growth on and higher than 50% adsorption of STPP (200 ppm) after 24 hours of inoculation. Strains POU1.3, POU1.4, and PAN1.12 showing high absorption and chemotaxis towards STPP were identified as Acinetobacter sp. POU1.3, Acinetobacter sp. POU1.4, and Comamonas sp. PAN1.12 based on 16S-rRNA gene sequence analysis.

In this paper, the connected p-maxian problem on tree graphs is considered. To solve the problem, firstly, a finite dominating is found. Then, a combinatorial algorithm is developped for the problem based on computing objective values with respect to all elements in the dominating set.

This study was conducted to select bacterial strains with probiotic potential from acerola fruit (Malpighia glabra L.). Nine bacterial strains that can tolerate pH 2.5, in which HC1 had the best survival ability with a cell count of 4.73 logCFU/mL. Three strains of bacteria HC1, KA2, TB5 with the highest tolerance to bile salts had the ∆OD values ​​of 0.298, 0.269, and 0.266. HC1, KA2, KA3, KA4, TB4 and TB5 were resistant to three antibiotics including tetracycline (30 µg/mL), ampicillin (10 µg/mL), and ofloxacin (30 g/mL). HC1 and KA4 bacterial strains had the highest self-adhesion with adhesion rates of 49.35% and 48.69%. Furthermore, HC1 bacterial strains were resistant to Escherichia coli with a resistance of 7.27 mm. Through probiotic potential test, HC1 is a potential bacterial strain selected for 16S RNA gene sequencing, the results showed that this bacterium is Lactiplantibacillus plantarum strain with a similarity of 97.20 %.

The processing of ginger tea bags can significantly impact the characteristic qualities of the product. The objective of this study is to evaluate the factors influencing the maintenance of ginger’s characteristic yellow color and its bioactive compounds, ensuring the production of high-quality tea products. The research focused on three main aspects: (i) investigating the impact of citric acid concentrations, (ii) evaluating temperatures and blanching times, and (iii) assessing NaCl salt concentrations in the soaking solution regarding the characteristic yellow color, flavor, and bioactive compounds of ginger tea. The research results indicated that soaking ginger in a 2% citric acid solution at a ratio of 1:3 (w/v) for 30 minutes achieved a great brightness value and preserved the best bioactive properties. Subsequently, blanching the citric acid-soaked ginger at 100°C for 2 minutes yielded the highest color quality. Moreover, further soaking ginger in a 1% NaCl solution at a ratio of 1:3 (w/v) reduced the pungency of the ginger tea product.

This study aimed to evaluate the effect of storage temperatures on lipid and protein oxidation of dried cultured snakehead (Channa striata). A survey of dried snakehead fish stored at three temperatures (28÷30ºC), (0÷4°C), and (-18÷-20°C). Research results showed that dried snakehead fish  stored 12 weeks at room temperature (28÷30°C), 32 weeks at cold storage (0÷4°C) and 48 weeks of frozen (-18÷-20°C) having peroxide index, TBARS value, total sulfhydryl group, free sulfhydryl group, color b*, and N-NH3 content were lower than the acceptable values. Dried snakehead fish stored at temperature (-18÷-20°C) in 48 weeks had peroxide index (0.170 mEq/kg), TBARS value (4.69 mg MDA/kg), total sulfhydryl group (22.44 µmol/g protein), free sulfhydryl group (8.48 µmol/g protein), color b* (4.27), and N-NH3 content (42.86 mg%).

The objective of this study was to evaluate the efficacy of fresh organic materials, including spent coffee grounds, eggshells, feathers, cow manure, azolla, and coal slag on the growth, yield of roses and some characteristics of the soil under greenhouse conditions. The experiment was carried out for 6 months with 6 treatments and 4 replicates. Organic material and the commercial organic fertilizer were applied at a rate of 4% (based on the dry soil weight in each pot) at 0, 40, 80, and 120 days after planting. The results showed that the treatments received a fresh organic mixture of spent coffee grounds, eggshells, azolla, cow manure, feathers, and coal slag with a ratio of 1:1:1:1:1:1 had higher branches of the rose plant, the number of leaves, flower diameter, number of flowers, and weight of flowers/pot as compared to the other treatments. Moreover, soil characteristics such as pH, EC, and number of bacteria and fungi were also improved and increased significantly in treatments applied with fresh organic materials.

The study aimed to determine the efficiency of eco-friendly measures to prevent citrus root parasitic nematodes in citrus. Therefore, an experiment was arranged in a completely randomized design with 5 replicates and 22 treatments, including: control; Ca(OH)2, KOH solution (pH: 10, 11 and 12); extracts of “sai dat” tree, neem leaves, “tram ta” leaves at 10%, 20%, 30%; Paecilomyces lilacinus at 10, 20, and 40 kg/ha; Trichoderma sp. at 20, 40 and 80 kg/ha. As a result, treatments of Ca(OH)2 solution at pH: 11 and 12, extracts of “sai dat” tree, neem leaves, “tram ta” leaves at concentrations of 10%, 20%, and 30% quickly controlled parasitic nematodes but their effect decreased over time, ranging in 67.8 - 86.5% for soil (20 days after treatment-DAT), and 59.8 - 89.4% for roots (100 DAT). On the contrary, Ca(OH)2 (pH: 10) and KOH (pH: 10, 11 and 12) rapidly affected, lasting up to 40 and 60 DAT, then declining (effective ranges were 51.6 - 60.3% for soil at 20 DAT, 59.1 - 66.9% for roots at 100 DAT). In addition, Paecilomyces lilacinus (10, 20, and 40 kg/ha) and Trichoderma sp. (20, 40 and 80 kg/ha) had slow control at the beginning, which increased over time (effective range was 69.6 - 80.4% for soil and 59.7 - 82.9% for roots at 100 DAT). Moreover, measures of controlling root parasitic nematodes in citrus improved the total population of soil microorganisms (bacteria, fungi, actinomycetes).

The study aimed to evaluate the effects of the plant probiotics microbial product (PP) comprising of Bacillus spp. và Lactobacillus spp. on soil biological properties, growth, and yield of Malabar spinach under the greenhouse conditions. The experiment was carried out as a completely randomized design with six treatments, four replicates, and two consecutive seasons. The results indicated that the treatments applied with single PP or PP in combination with 50% and 70% of the recommended NPK dose enhanced the number of bacteria in the soil. Significantly, the application of PP in coordination with a reduction of 25% of the recommended NPK dose boosted plant height, leaf length and width, chlorophyll content in leaf, and fresh Malabar spinach weight/pot, and these parameters were equivalent to the positive control treatment received recommended NPK dose. In short, PP recorded an effective use potential in safe and sustainable vegetable crop production.

The study was carried out to determine the drought tolerance of duong orange. It was implemented from 10/2022-12/2022 in a greenhouse, the average air temperature and humidity of 33,8oC and 64,9%, respectively. The experiment was arranged in a completely randomized design, with 2 factors: the environment (without and with drought treatment) and the orange varieties (duong, ba la, and mat). The experiment had 30 repeats, 1 repeat was 1 plant/pot. The results showed that duong orange trees maintained their leaf color (ΔE*ab) after 25 drought days. Drought condition had less effect on the chlorophyll index of duong orange. The proline content in leaves and the ability to accumulate proline under drought condition of duong orange were both very low which indicated that duong orange were less sensitive to drought. Duong oranges trees showed signs of wilting after 23,8 drought days and the percentage of dead plants after 30 drought days was low (30%) when the sand moisture was 1,53%. Duong orange tree in drought condition was equivalent to normal conditions, the roots developed well. The plant biomass of duong orange was higher than that the others varieties under the same drought condition. Therefore, duong orange trees have good tolerance to drought conditions.

This study aimed to investigate the effect of plant probiotics microbial products (CPVS PP) containing Bacillus spp. và Lactobacillus spp. on growth, yield of Water spinach and some soil properties under greenhouse conditions. The experiment was arranged with 6 treatments 4 replicates in 2 consecutive crops. The results showed that the application of 75% NPK + 0.4% PP microbial product helped to increase plant height, number of leaves, and chlorophyll content in leaves, while fresh and dry weight per pot of  Water spinach was equivalent to the positive control treatment with 100% NPK  recommended. Besides, the treatments applied with PP microbial products also improved the soil Electrical Conductivity (EC) and the number of soil bacteria. In summary, applying the  PP microbial product with a concentration of 0.4% is recommended in vegetable cultivationfor safe and sustainable development.

Investigation of the interaction between the root-knot nematode Meloidogyne incognita and the fungus Fusarium oxysporum f.sp. cubense cause Panama wilt disease on Cavendish bananas Musa cavendish “Grande Naine”. This study aimed to evaluate the simultaneous interaction of two pathogens and how the sequential increase in nematode populations affects the symptoms of Panama wilt. The results showed that simultaneously infected with two nematode and fungal agents had lower plant growth parameters and showed more severe symptoms of wilting and nutritional deficiency compared with the experimental ones infected individually. This level increased rapidly and was aggravated by the increased number of nematodes present simultaneously. In the treatment with the nematode M. incognita (1 individual/g soil) and the fungus Fusarium oxysporum (106 spores/mL), the plant growth was reduced and lower than that of the treatment alone, and the symptoms increased and wilting was proportional to the number of nematodes M. incognita. However, in the experiment infecting 4 nematodes/g of soil interacting with 106 fungal spores/mL, the density of nematodes increased the least compared to the other infection experiments, showing that with the density of infection. Initially high, there was a competition between the two parasitic agents.

The study’s objective was to evaluate the efficacy of four organic fertilizers produced from spent coffee grounds, Azolla, eggshells, coal residual, cow manure, and feathers on the growth of water spinach and maize plants under the net house conditions. Four organic fertilizers were produced for the experiment including (1) freshly mixed organic materials, (2) composted organic materials, (3) composted organic materials inoculated with four organic decomposing fungi, and (4) vermi-composted organic materials. The experiment was carried out with 11 treatments and three replicates under greenhouse conditions. The results indicated that organic materials and four organic fertilizers met the standard requirements for organic fertilizer products. Composted fertilizer (COM), composted fertilizer inoculated with four fungi (COM + BF), and vermi-composted fertilizer (V-COM) obtained higher nutrient content than freshly mixed organic fertilizer (FMOF). V-COM with and without 50% soil added increased the plant height, root length, above ground, and root biomass of water spinach and maize equivalent and even higher than the commercial vermi-compost product.

The study aimed to determine the effectiveness of the extracts of roselle leaf (Hibiscus sabdariffa L.) under different solvents. Interestingly, the extracts obtained remarkable levels in anti-bacterial activity against V. parahaemolyticus causing acute hepatopancreatic necrosis disease. The inhibition zone diameter was 24.9 mm, 21.6 mm and 11.9 mm under methanol solvent, ethanol solvent and boiled water, respectively. The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) of the extract in methanol were 0.02 mg/mL and 0.08 mg/mL, respectively. Moreover, roselle leaf methanol extract stimulated the growth of whiteleg shrimp when they were reared with feed supplemented with extracts at 1% and 1.5% after 30 days of experiment.  Hematological parameters, including otal hemocyte count (THC), granular cell (GC), hyaline cell (HC) of the shrimp fed with the extract at doses of 1% and 1.5% significantly higher than that of the control (p< 0.05). The research results show that roselle leaf extract has great potential in shrimp farming.

The study was carried out to provide information on the reproductive biology of Pangasius macronema. Fish samples were collected (30 samples/site/time) periodically once a month at three locations along Hau river (n=1,170) in Can Tho city. The sample collection period was 13 months (from February 2020 to February 2021). After collection, the fish samples were transported to a laboratory at the College of Aquaculture and Fisheries, Can Tho University to analyze reproductive biological indicators, including gonadal development stages, gonadosomatic index (GSI), fecundity, and egg diameter. The results showed that Pangasius macronema with gonads in stages III and IV accounted for a high proportion, mainly from March to August, with GSI ranging from 5.08 to 7.16%. Clark fat ranged from 0.60 to 1.12%. The fecundity of Pangasius macronema was relatively high; the mean absolute fecundity was 6,007±4,484 eggs/individual, and the mean relative fecundity was 161±71 eggs/g female. The diameters of fish eggs were 0.79±0.06mm. The above results show that the spawning season of Pangasius macronema is from March to August.

The study focuses on applying the SARIMA model to forecast the export volume of fishmeal in Vietnam for the last 8 months of 2023, using R software, Python programming language, and insights from OpenAI's Artificial Intelligence. The research data was collected from the General Department of Vietnam Customs from January 2018 to April 2023. The research findings indicate that the most suitable model for forecasting is SARIMA(1,0,0)(1,0,0)12. Applying this forecasting model yields highly accurate results, closely aligning with export volume. Furthermore, the study proposes several recommendations for export policy planners. Specifically, it emphasizes the importance of diversifying export markets, effectively leveraging opportunities from Free Trade Agreements (FTAs), implementing rational aquaculture zoning, and regulating the export volume of fishmeal to avoid domestic shortages and the paradoxical situation of large-scale imports of fishmeal from other countries.

This study uses linear quantile regression to investigate the impact of internal factors on the performance of insurance companies in Vietnam between 2012 and 2021. The study results revealed that financial leverage, asset turnover, and net profit margin positively impact the performance of insurance companies in Vietnam, and this effect is observed across all percentiles considered. Conversely, factors such as the company's age and the reinsurance business harm their performance. On the other hand, company size, growth rate, current ratio, and Covid-19 have no statistically significant effect on the performance of insurance companies regarding risk in Vietnam across all percentiles. Compared to previous studies, the results showed that the reinsurance business of insurance companies in Vietnam reduces their performance.

A study was conducted surveying 203 customers who had previously shopped at the Go Can Tho supermarket. After conducting descriptive and comparative statistical analyses to evaluate the level of customer evaluation and perception regarding the company's cultural symbols and the elements that constitute service quality, as well as the post-consumption behavior intentions of customers at the supermarket, the evaluation results indicated that the cultural and service quality factors were relatively evaluated. The factor analysis model yielded 10-factor groups, including: merchandise (4 observed variables), employees (5 observed variables), display (3 observed variables), premises (3 observed variables), safety (3 observed variables), loyalty (5 observed variables), extra pay (2 observed variables), customer complaints (2 observed variables), visual represental (6 observed variables), and non-visual represental (8 observed variables). A linear structural equation model (SEM) analysis showed that the company's culture had a positive impact on service quality, the company's culture had an impact on customer behavior intentions, and service quality had an impact on customer behavior intentions.

This study aims to analyze the factors influencing student satisfaction with the quality of training at Can Tho University of Technology. The research data was collected through a survey of opinions from 245 graduated students. The reliability of the measurement scale was assessed using Cronbach's Alpha coefficient, and exploratory factor analysis (EFA) and multiple linear regression were employed to analyze the data. The analysis results indicated that students generally expressed satisfaction with the quality of training provided by the university. Additionally, the model results revealed that several factors influenced student satisfaction with the quality of training, including facilities and equipment, reputation and prestige of the university, quality of lecturers, extracurricular activities, and training programs. Among these factors, facilities and equipment had the most substantial impact on student satisfaction with the quality of training at the university. 

The need for learning and scientific research remains a central and substantial need in universities. At Can Tho University (CTU), intending to achieve efficiency in academic activities, textbooks, coursepacks, and scientific research works at all levels are extremely useful resources. As an educational institution, CTU owns the copyright to many scholarly works created by its officials and employees. However, the publication and communication of these works is currently quite limited. This study aims to make recommendations to help the university foster the dissemination and communication of local works in order to provide an abundant resource of materials and create favorable conditions for people who wish to use them.

The exploitation of intellectual property rights in general and copyright in particular in universities is rather complicated as it involves the identification of rights holders and the content of their rights. This article aims to analyze the provisions of the Intellectual Property Law of 2005, amended and supplemented in 2009, 2019 and 2022 on certain issues related to the status of author and copyright holder of works created by students in universities. In addition, based on the provisions of the law in force, this study also points out the rights held in each particular circumstance, the particular status linked to the creation of the works and the analysis of the procedure for requesting authorization to use the works in specific cases.