This research introduces a vendor-managed inventory (VMI) model for a multi-supplier single-manufacturer supply chain where the upstream members can be traders and-or producers and the downstream member is a producer.  The principal objective of this paper is to minimize the cost of transportation, inventory, and penalty for a textile supply chain. The utilization of three types of trucks (small-medium-big) for delivering suitable replenished quantity that reduces transportation cost remarkably. Moreover, to decrease the inventory and penalty level, the upper limit is set to balance the replenished quantity from upstream. The best solution for this paper is found out by implementing in Python software and sensitivity analysis is performed to demonstrate the usefulness of the VMI model.

In this study, chitosan was extracted from Penaeus monodon shrimp shell waste and was used as a bio-sorbent to remove Methyl Orange (MO) dye in aqueous solution. Batch adsorption experiments were carried out to evaluate the influence of solution pH, chitosan dosage, contact time and initial MO concentration on the adsorption process. The study was conducted with varying contact time from 1 to 720 min, adsorbent dose from 0.1 to 3 g, adsorbate concentration from 10 to 200 mg/L, and pH from 3 to 10. The results showed that adsorption of MO by chitosan reached equilibrium after 240 min. The maximum adsorption capacity of MO calculated by Langmuir model was 23.1 mg/g obtained at room temperature (25°C), pH of 3, chitosan dose of 0.2 g and MO concentration of 50 mg/L. The kinetics of the adsorption process followed the pseudo-second-order kinetic model with the correlation coefficient R2 of 0.96. The Langmuir isotherm adsorption model described well the MO adsorption process, with R2 of 0.97. The study demonstrated that the chitosan can be extracted from shrimp shells simply and can be effectively used to remove Methyl Orange anionic dye in aqueous solution.

This study aimed to evaluate the efficiency of domestic wastewater treatment using/applying a combined moving bed biofilm reactor (MBBR) and handmade membrane filter column operated at different hydraulic retention times (HRT). The laboratory scale of 45.54 L MBBR containing 40% K3 media and a membrane filter column made by groundwater filter column and tulle were used. The results showed that a loading rate of 0.47 kg BOD5/m3/day to the MBBR, and loading rate to membrane filter column of 0.79 m3/m2/day, the HRT of 6 hours, the effluent wastewater met the QCVN 14:2008/BTNMT (column A) with BOD5 treatment efficiency of 94.6%; COD of 86.6%; N-NH4+ of 88.2%, and TP of 67.6%. For the HRT of 5 hours, the loading rate through MBBR of 0.77 kg BOD/m3/day, and through the membrane filter column of 0.95 m3/m2/day, the output wastewater reached QCVN 14:2008/BTNMT (column A), in which the BOD5 treatment efficiency was 89.5%, COD 89.4%, N-NH4+ 84.5%, and TP 57.6%. Therefore, the combined MBBR and handmade membrane filter column can be applied to treat domestic wastewater that reaches QCVN 14:2008/BTNMT (column A) at HRT of 5 hours.

The limitation of the method Monte Carlo Naïve (MCN) was presented in this paper. This method is used to estimate the probability of rare events (events with very small probability). In the MCN method, to be able to observe rare events, it is necessary to initialize very large simulation samples. This limitation can be solved by using the Cross Entropy (CE) algorithm. The numerical results presented in the last section will further clarify the superiority of this method.

In this study, a zeolitic imidazolate framework based on ZnN4 cluster was synthesized in water at room temperature. The reaction was studied by combination of ZnSO4ž7H2O with linker 2-methylimidazole  (2‑HmIm) in various conditions of 2-HmIm concentration and mole ratios of 2‑HmIm/Zn. The structure of the resulting material was characterized by powder X-ray diffraction (PXRD). The morphology of the compound was observed by scanning electronic microscopy (SEM) and the elemental composition was determined by energy dispersion X-ray spectroscopy (EDS). Thermal gravimetric analysis (TGA) was used to illustrate the thermal stability of the material. It was demonstrated that the obtaining Zn-ZIF was successfully synthesized by green method with high crystallinity and high thermal stability. The product was further subjected to catalyze the reduction reaction of environmental pollutant 4-nitrophenol with reducing agent NaBH4. The preliminary study showed that the pristine Zn-ZIF did not exhibit catalytic activity due to fully saturated ZnN4 sites. This result paves the research direction to the way of modifying the pristine material resulting in unsaturated metal sites distributed on the carbon framework.

This research work presented the figure of merits of optical sensor using prism based on surface plasmon resonance with thin layer of Ag, and the wavelength of 1064 nm. The simulated results showed that the sensor with Ag layer of 60 nm coated will give good responsibility with the detection accuracy was 14 times higher than that of the sensor using wavelength of 633 nm. Moreover, the penetration depth was around 789.6 nm, which was 3.5 times better than that of the case of 633 nm wavelength. In addition, the sensor with a sensitivity of 93.40/RIU was 1.5 times lower in comparison with the case of using 633 nm. The enhancement in detection accuracy and penetration depth for the sensor using wavelength of 1064 nm will be offered advantages for early detection of bateria with size from 1 µm to 20 µm in the biomedical and food applications.

A completely randomized design study was conducted in 80 So Dua (SD, Sesbania grandiflora L.) trees (40 white flower trees and 40 red flower trees) of 1- month – old. The experiment included  two treatments (white flower trees and red flower trees) with four replicates to investigate growth, yield and chemical composition of two SD varieties. The results showed that the height of white flower SD trees was higher than that of red flower SD trees (P

This study aimed to evaluate the immune response of two attenuated M.B. A total of 135 one-day-old Ác chicken were arranged in a completely randomized design with one factor coming in 2 groups (1) vaccination with MB-1 at 1 one-day-old in the hatchery; and (2) vaccination with live MB vaccine at 7 and 15 days old at the farm. Chickens were blooded at 1, 14, 21, 24, 28 days old to check IBD antibody titer. In addition, bursa index (BI), body weight, and daily weight gain of chickens from 1-49 days old were also monitored. The results showed that the maternal antibody against IBD virus of the flock was 1515 titers with a CV of 58.7%. On 14, 21, 24 days old, antibody titer IBD between the two group was not statistically different (P > 0.05). By 28 days old, antibody titer IBD of MB-1 group was significantly higher than antibody titer of MB live group, 6218 titer and 5075 titer (P < 0.05). The BI, body weight, and daily weight gain of the MB-1 group tended to be higher than the MB live group over time.

Red dragon fruit (Hylocereus polyrhizus) is a favorite fruit due to its delicious taste and attractive color. The fruit contains many nutrients that are good for health. The objective of this study is to optimize conditions for cider production from red dragon fruit, including the dilution ratios (1:1; 1:2; 1:3 w/v), fermentation time (2, 3, 4, 5 days), Brix (14 - 22°Brix), pH (3.8 - 5.0), and yeast cell concentrations (0.02 - 0.1% w/v) of Saccharomyces cerevisiae BV818. The new product may take advantage in diversifying the use and value of dragon fruit. The cider was successfully produced from red dragon fruit juice with an ethanol content of 4.79% v/v after 5  days of fermentation with the material and water ratio of 1:2 w/v, initial total sugar of 18.5 ºBrix, pH 4.16, and yeast cell concentration of 0.07% w/v.

This study aimed to analyze main compositions and evaluate the effectiveness of hydrolysate from brewer’s spent yeast as an  economical nitrogen source to replace commercial yeast extract in a lactic fermentation medium. The main composition in hydrolysate from yeast residue was protein content of 74.45% (dried weight), while carbohydrates and fat were undetected. The total polyphenol content in the yeast hydrolysate was 0.32 mg GAE/mL. The antioxidant capacity at a concentration of 100 μL/mL could reduce 34.51% of the free radicals of 2,2-diphenyl-1-picrylhydrazyl (DPPH). The protein source of the De Man, Rogosa and Sharpe (MRS) medium was entirely replaced by 10% (v/v) hydrolysate, which increased the density of lactic acid bacteria to 8.09 CFU/mL and was not significantly different from that of the commercial MRS medium. The lactic acid content produced was 66.52% of the acid content produced by commercial MRS medium. This study indicates that the hydrolysate from brewer's spent yeast can potentially apply as a protein source in microbial fermentation.

Anoectochilus sp., the Orchidaceae family, is one of the precious medicinal plants of Vietnam. Their extract contains several compounds related to cardiovascular functions such as arachidonic acid metabolites, β.– sitosterol, etc. The purpose of the study is to establish an in vitro propagation procedure for the conservation and development of Anoectochilus sp. using the plant growth regulators (6-benzylaminopurine, thidiazudron) combined with the thin cell layer technique have rapidly increased the number of shoots and rooting. The results showed that Murashige & Skoog medium supplemented with 0.5 mg/L 6-benzylaminopurine combined with 0.5 mg/L thidiazudron was optimal for the growth of Anoectochilus sp. shoots with 3.67 shoots/sample. The technique of transverse cell slicing combined with light intensity at 2,000 lux resulted in the highest number of shoots arising from the slice with 13.16 shoots/sample. In vitro shoots of Anoectochilus sp. with optimal rooting on Murashige & Skoog medium reduced by 25% in both macro and microelements. This system could be used for large–scale propagation of Anoectochillus sp.

A completely randomized design was applied in 48 white flower Sesbania grandiflora treesof 3-6 months old to measure the effect of different fertilizers on yield and chemical composition. The treatments were the amounts of inorganic and organic fertilizers (ton/ha/year) including 1.6 of inorganic fertilizer (P1), 2 organic fertilizer (P2), 0.8 inorganic fertilizer + 2 organic fertilizer (P3), and 1.6 of inorganic fertilizer + 2 organic fertilizer (P4). The results showed that the highest (P

This study was conducted to determine the effect of salinity levels (0, 1, 2 and 3‰) on the growth and physiology of cove pea plants at seedling stage and the effect of vermicompost dosage (0, 10, 20 and 30 tons/ha) on the growth, yield and quality of dwarf cove beans under artificial saline irrigation during the flowering stage. The results showed that the cove bean plants in the seedling stage grew well at the salinity level of 2‰. The salinity level 3‰ affected the growth of plant height, root length, plant biomass and root biomass. Saline irrigation for 3‰ of the flowering period reduced fruit quality, reducing yield by 18.2% compared to the treatment without saline irrigation. Applying 30 tons/ha of vermicompost increased 14.6% compared to the treatment with only NPK. The results recorded that the yield of dwarf cove beans in the treatments of 20 tons and 30 tons/ha of vermicompost was not statistically significant. It is possible to use a dosage of 20 tons/ha of vermicompost for cove beans to save costs in production.

This study was carried out to determine the optimum concentrations of plant growth regulators (BA, kinetin, IBA and NAA) which are suitable for shoot regeneration from cotyledons, multiplication and rooting of cantaloupe in vitro. The experiments were taken place in Laboratory of Plant Tissue Culture, College of Agriculture, Can Tho University. It consisted of three experiments using completely randomized design with two factors including shoot regeneration from cotyledons sections, shoot proliferation, and rooting of cantaloupe in vitro. The results showed that the cotyledons at proximal  (seedlings 3 days after sowing) on Murashige and Skoog medium supplemented with BA 0.5 mg/L obtained a high rate of shoot regeneration 97.5% after 3 weeks; Murashige and Skoog medium supplemented with Kinetin 1.0 mg/L and BA 0.5 mg/L was effective for the rapid proliferation of shoots in vitro with 3.4 shoots and IBA 0.5 mg/L was favorable for root induction (78.1% and 3.8 roots) of cantaloupe shoots which were regenerated in vitro from cotyledons.

The species diversity and catch size of fish in the Southern waters of Vietnam were determined based on 7088 specimens collected from 2015 to 2020 in the areas from Da Nang to Kien Giang. There were 930 species belonging to 442 genera, 153 families, 41 orders, and 4 classes identified. The total length of the caught fish ranged from 3.5 to 185 cm The average fishing length of fish in coastal waters is about 17 - 20 cm. Fish caught in the Paracel and Spratly Islands waters were larger in size, compared with coastal waters, averaging 45cm. The average body length of fish caught monthly is less than 25 cm. The results also identified 38 species being threatened for three categories Critically endangered (CR), Endangered (EN), and Vulnerable (VU) following the IUCN Red List, with 3 species in CR, 9 species in EN, and 26 species in VU. According to the categories of the Red book of Vietnam in 2007, there are 20 species in threatened categories, of which 13 species in VU and  7 species in EN. These data are essential materials for the management of exploitation and conservation of threatened fish species in the next time.

The Reeve’s croaker (Chrysochir aureus) is a brackish fish, that is belong to demersal economic fish, accounting for 0.1% of the total catch in the Southeast Sea of Viet Nam. A study on the morphology of the digestive tract and feeding habits of Reeve’s croaker were conducted from June 2021 to January 2022 in the coastal areas from Soc Trang to Bac Lieu provinces (from 105o46’E to 106o18’E and 8o55’N to 9o21’N). Fish samples were collected monthly using bottom trawling. The total fish samples included 179 samples with body length ranging 18.0 - 38.0 cm. Fish stomachs were preserved in 4% formol solution. The results showed that Reeve’s croaker possesses a wide mouth with the upper jaw is more protruded in comparison with the lower jaw. The gill rakers are sparsely spaced and short. The esophagus is short and thick wall with many folds. The stomach is pouch-shaped and has many folds inside. The caeca are consisted of 5-7 branches. The intestine is short and thick-walled with two folds. The relative length of the gut (RLG) is less than 1, suggesting that the species is a carnivorous feeding habit. There was a change in the stomach contents between immature and mature fish. The immature fish eat mainly small fishes, shrimps, and other foods, while the mature fish eat small fishes, shrimps, squids, crabs, nereids, and others.

This study was evaluated the effects of feeding frequency using an oral vaccine and the potential of β-glucan and vitamin C to enhance the vaccine efficacy in preventing bacilli necrosis in striped catfish. Experiment 1 evaluating vaccine feeding frequency was arranged with 5 treatments with oral vaccines used at different feeding frequencies and 1 control. The results revealed that the fish fed with vaccine continuously for 9 days had the greatest RPS value (42±7.07%) when challenged with E. ictaluri, whereas the growth performance of vaccine treatment groups was lower than in the control, but the difference was not significant (p>0.05). In experiment 2, fish was fed with the vaccine continuously for 9 days in combination with different concentrations of immunostimulants. The results showed that the vaccine supplemented with 2% β-glucan not only improve the RPS value (52.4±0%) and the antibody level (6.25±1.77) but also reduce the negative effects of oral vaccines. This study revealed that the protective ability of the oral vaccine will be increased with continuous supplementation and β-glucan might be used as an adjuvant to an oral vaccination in striped catfish.

Two Artemia culture systems were conducted simultaneously in 2,000 m2 ponds (2 ponds for each system). The stocking densities were 200 nauplii/L for biomass culture systems and 100 nauplii/L for cyst culture system. The results showed a similarity in culture conditions for both systems. The highest population density recorded in the biomass system was 366 nauplii/L, and in the cyst system was 237 nauplii/L. In the biomass culture system, the yield was 3.04 ton biomass and 14.6 kg cysts/ha/crop; in the cyst culture system, the yield was 71.5 kg cysts and 520.1 kg biomass/ha/crop. The total cost for the biomass production system was 45,0±9,1 million VND/ha/crop, and the average profit was 74.5±21.5 million VND/ha/crop, 1.6 times higher than that of the cyst production system (45.8± 25.0 million VND/ha/crop).

This study provides information regarding the application of lesson study (LS) to develop scientific research awareness (SR) competencies of high school teachers (HST). In this study, educational research approaches were applied to form the research model. The study results certified that all HSTs were aware of the importance of diversifying LS training methods. The HSTs also understood that applying templates (planning, lesson-plan building) in the LS process was essential to collecting research data. In addition, most HSTs indicated that the skills needed to conduct LS were similar to those necessary for doing SR. The agreement level was very high (from 4.27 ± 0,77 to 4.48 ± 0.63). Especially, the HSTs assumed that “LS also required data collection just like when doing SR” with a significant high agreement level (4.64 ±0.48), an aspect that had not been noticed before in the LS process. This research results also showed that applying LS would enhance the SR awareness competencies of the HSTs.

Nutrition education for citizens in general and primary school students, in particular, is an urgent issue of great interest to leaders, researchers, and educators. According to the New General Education Program (2018), at the primary level, nutrition education is integrated into the content of subjects, especially Grade 4 Science. Besides, nutrition content is related. Closely related to the life of primary school students; therefore, the organization of teaching activities according to the 5E model will exploit students' existing knowledge; create conditions for students to discover and discover their nutritional science knowledge. The experimental pedagogical research method was used to evaluate the teaching process according to the 5E model for the nutritional content circuit in Science 4 to develop natural science competence and meet the educational objectives. New general education curriculum 2018.

This research is conducted to measure factors that influence student’s satisfaction on quality of some service activities of supportive units in Can Tho University. The data was collected from 250 students from the College of Economics, School of Law, School of Education and School of Social Sciences and Humanities using convenience sampling. Descriptive statistics, Cronbach’s equation modeling, Exploratory and Confirmatory Factor Analysis and multiple linear regression are used in this research to identify factors that influence student’s satisfaction on quality of services of some supportive units in Can Tho University. The result showed that three factors affected the level of students satisfaction, including (1) Attitude (βeta = 0.399), (2) Expertise and facilities (βeta = 0.235), (3) Process of work (βeta = 0.189). Among them, the factor that strongly affected students’ satisfaction is Attitude. The research results have suggested a number of suitable solutions from the students and the University in order to make it easier for students to access some supportive units when needed.

This study of literature from the perspective of discourse has practical and scientific significance. The characteristics of the narrator's discourse through the short stories of Tran Bao Dinh were summarized in this article. The narrative, descriptive, and commentary components in the narrator's discourse were identified and analyzed and evaluated through specific compositions. From there, it is possible to point out the unique features of Tran Bao Dinh's narrative style.

The article is to analyze the narrator in Nguyen Ngoc Tu’s novel (consist of: Song and Bien su nuoc). Studying Nguyen Ngoc Tu’s novel by narratology, the narrator is one of the important problems that show her renovation in creation method. The narrator in Nguyen Ngoc Tu’s novel with role and function contributes to create attraction and value of works.

Responsible tourism has become popular and received the attention of many researchers, but few studies have investigated the relationship between customer engagement and responsible behavior. The purpose of this article is the relationship between tourist responsibility practices with the behavior intention of responsible tourism. In this study, tourism responsibility practices were examined from three perspectives: economic responsibility, sociocultural responsibility, and environmental responsibility. The 220 questionnaires were collected from domestic tourists to Thua Thien Hue and 200 questionnaires were used to analysis. A structural model measurement method using SmartPLS was used to test the hypotheses. The research results confirm the accepted hypothesis, that there is a positive relationship between tourist responsibility practice and responsible tourism behavioral intention. In particular, the element of responsibility to the environment plays a critical role in deciding the responsible behavior of tourists.

Digital transformation (DT) is a discernible trend and has considerably changed socio-economic development. This work aims to identify critical motivations for the acceptance of DT among retail enterprises in Vietnam. First, a research model is formulated by associating between the TOE framework with digital and entrepreneurial orientation to explicate DT acceptance across Vietnamese retailing enterprises. Data were collected from 301 respondents and SEM was applied to examine the model and its hypotheses. Results reveal that TOE antecedents (i.e., technological, organizational and environmental contexts) significantly impact on top management support (TMS). Furthermore, TMS, digital orientation, and entrepreneurial orientation are vital in retailing enterprises’ acceptance of DT. Lastly, conclusions and implications are provided to leverage DT among retailing enterprises.

Financial well-being plays a fundamental role in developing and maintaining life quality both physically and mentally. Nurturing healthy financial well-being for the young generation becomes even more crucial when this is the primary resource for society's development. This study aims to assess the impact of financial discussion, financial literacy and attitude towards money on the financial well-being of young adults in Hanoi. Using a research sample of 219 observations and the OLS regression model, the study shows that financial discussion and attitude towards money positively and significantly impact young adults‘ financial well-being, while the effect of financial literacy is insignificant. The research findings offer important implications to further improve the financial well-being of young adults.

Saltwater intrusion in 2016 greatly affected agricultural production in Ben Tre province in areas that had never, rarely and often suffered from saline intrusion. Thus, the study assessed the change in income of mangosteen growers from adaptive livelihood strategies to saline intrusion and economic activities through interviewing 196 mangosteen growing households in Ben Tre province in March 2019. Mangosteen growers have converted part or all of their mangosteen acreage to other crops (42%). This change has increased household income by 63 - 116% and income from cultivation by 79 - 143% in 2018. However, the conversion of crops too quickly is likely to affect the income of the converted households in the following years. Mangosteen growers need to acquire knowledge on market access and farming techniques for both mangosteen and new crops adapted to saltwater intrusion in order to increase household income.

This study aims to examine factors influencing tourists’ satisfaction with local cuisine through a survey of 280 domestic tourists visiting Hue and by applying the theoretical framework of pull and push factors. Using the Partial Least Squares Structural Equation Modeling (PLS-SEM) method to analyze data, the study found that perceived food quality, perceived price, and tourist motivation to consume local food positively influenced tourist satisfaction. The perceived food quality had the largest positive impact on the local cuisine satisfaction of domestic tourists. Based on these results, several key practical and managerial implications were proposed to increase tourist satisfaction with local cuisine, including enhancing the understanding and awareness of food safety among businesses involved in tourism, supporting the use of healthy and locally grown ingredients, enforcing the publication of food prices and a single rate for each meal for all customers in a restaurant, and enhancing food story-telling for tourists.