Composite materials are fabricated from corn stalk fibers on recycled high-density polyethylene via the compression molding method. The structure and chemical composition of corn stalk fibers before and after treatment with NaOH solution were briefly observed through scanning electron microscope (SEM) images and analyzed by thermogravimetric analysis method (TGA). The influence of machining conditions, fiber volume ratio on shrinkage, and mechanical properties of composites were also investigated. The results show that corn stalk fiber has a cellulose content of ~61%, and the fiber structure has many large pores, which is different from other common natural fibers. The mechanical properties of the material are highest in the processing conditions: pressing temperature 145oC, pressing time 10 minutes, pressing pressure 100 kg.cm-2 and fiber volume ratio 50%, with tensile strength ~31 MPa, flexural strength ~34 MPa, impact strength ~11 KJ.m-2 and material shrinkage is 0.4%. The composite materials created in this study meet the quality standards of materials used in manufacturing, interior decoration, and construction.

In Vietnam, the beauty care industry is one of the highly competitive business fields. Knowing which products are popularly searched for on Google and understanding future search prediction data on Google helps investors and those in charge of sales and marketing departments with informed information. Researching and developing business marketing strategies to compete with competitors or for investors to consider when making investment decisions is helpful. This article implements methods for collecting, preprocessing data, analyzing, and extracting content information from websites popular on Google. Finally, predict future search figures on Google using machine learning algorithms. Experimental results have shown outstanding products and proposed suitable models to predict future search data on Google.

This study described the removal of Cr(VI) in aqueous solution on biochar derived from used bamboo skewers through pyrolysis at 500oC. The cross-sectional morphology showed complex pore structures having different pore sizes, making it ideal for Cr(VI) adsorption. Accordingly, the removal efficiency of Cr(VI) reached over 99% at the optimum condition: the absorbent dosage of 0,6 g, pH solution of 2, contact time of 105 minutes, and 50 mL of solution with Cr(VI) concentration of 40 mg/L. Research on the adsorption isotherm model suggested that the adsorption process of Cr(VI) on bamboo biochar was well fitted to Langmuir monolayer adsorption model with the maximum adsorption capacity of 6,26 mg/g, and the kinetics of Cr(VI) adsorption were described with the pseudo-second order model which indicates the dominance of chemisorption mechanism. Generally, all the results have confirmed that the adsorbent derived from used bamboo skewers has great potential to remove Cr(VI) in aqueous solution.

In this paper, a random walk model in space aZ will be considered. First, the Poisson equation associated with the Markov operator P is solved to find its solution. Then, the variance of the random walk will be found based on the property of the solution of the above equation. Finally, the limit of variance will be calculated to obtain the desired result.

In this study, employing density functional theory, the optoelectronic properties of quantum dots based on one-, two-atom-doped pentagonal single-layer PdSe2 material are studied. The results reveal that QD-Ru1 and QD-Ru1O2 are the most stable structures, exhibiting absorption peaks in the infrared range with wavelengths around 3,000 nm. Introducing atomic impurities of Ruthenium (Ru), Rhodium (Rh), Silver (Ag), Oxygen (O), and Sulphur (S) at respective positions leads to a narrowing of the bandgap width in most cases compared to the original structure, except for QD-Rh1 and QD-Rh1O2. Moreover, the absorption peak shifts resulting from the introduction of single and double impurities O and S predominantly occur along the Oz axis, with corresponding wavelengths falling within the range of approximately 2,000 nm to 3,000 nm in the infrared region. These findings highlight the utility of atomic impurity doping as a promising method to discover novel structures for the development of optoelectronic applications using Palladium diselenide quantum dots.

Backgrounds: The rate of using traditional medicine in health care in the community of Vietnamese people tends to decrease and is not commensurate with its inherent potential. Objectives: (1) Describe traditional/herbal medicine treatment activities at health stations in Chau Thanh District, Hau Giang Province in 2022-2023, and (2) Evaluate the effectiveness of traditional/herbal medicine and herbal medicine at health stations in Chau Thanh District, Hau Giang, from 6/2022 to 6/2023. Results: Of the total prescribed traditional/herbal medicine, the traditional medicine usage rate accounted for 73.3%, and the herbal medicine usage rate accounted for 26.7%. Patients (88%) showed improvements in their conditions, and recovered well when using traditional medicine. Conclusions: The rates and activities, forms of medical examinations and treatments with traditional medicine of people at health stations in Hau Giang, Vietnam have been improved sustainably.

The paper investigates extremality and stationarity properties of collections of set-valued mappings on metric and normed spaces. These properties are generalizations of the corresponding properties of collections of sets. We establish an extremal principle for collections of set-valued mappings by using conventional techniques of modern variational analysis. The established result improves the work of Mordukhovich et al. (2003).

In exploratory geophysics, the process of quantitative interpretation of the field source characteristic parameters causing the observed anomaly is returned to the reverse field potential problem. The most popular obstacle in solving this problem is finding a unique mathematical solution because of the existence of many models simulated with different data with errors within the allowed range. In this article, the continuous wavelet transform, using the complex wavelet function Farshad-Sailhac and the Marquardt optimization algorithm are studied and applied to modeling sources of gravity anomalies in the Mekong Delta, to determine the characteristic parameters of the source including position on the map, depth, shape, three-dimensional, density difference. Therefore, many appropriate explanations about the geological nature of the sources of gravity anomalies in the survey area are enounced to contribute to improving the efficiency of exploratory geophysics methods in Vietnam.

According to ethnobotanical experience, Helicteres hirsuta Lour. contains many special biological active substances with antioxidant capacity, liver protection ability, and can be resistant to many types of cancer cells. This study analyzed, described the botanical characteristics, chemical compositions of H. Hirsuta, and soil properties collected at two locations (Cam Mountain - An Giang Province and Lai Son Island - Kien Giang Province). The objective of the study was to build a complete database for determining the effectiveness of disease treatment and zoning the growing areas H. hirsuta in the Mekong Delta. The results show that soil nutrients (especially nitrogen and phosphorus) have an affection on the morphology and anatomical structure of the species. However, H. hirsuta is a group of plants with low nutritional ingredients according to the assessment scale of TCVN (2000). There are differences in the chemical compositions when quantifying some compounds in different sampling areas. Some special medicinal substances such as saponin, phenol, and coumarin are only present in samples collected at Lai Son.

The study was to evaluate husbandry of beef cattle and lameness rate of cattle smallholder farms in Duc Hoa district, Long An province. Using questionnaires and interview 90 beef cattle smallholder farms. The results showed 1,751 beef cattle from 90 smallholders in 9 communes and about 20 cattle/smallholders. The cattle at 1 - 2 years had the highest rate at 37.46%, and >2-3 years at 34.55%. The beef cattle breeds included mainly Lai Sind, BBB (Blanc-Blue-Belgium), and Charolais. The fresh crude feed included feather grass (36.67%), elephant grass (27.78%), and honey grass (Eriochloa procera) (12.22%). The fermented feed was 12.22% from elephant grass, which was the most common type. However, the results showed that the barn was disinfected not often. The lameness rate at the householder level was 25.56% in 90 householders, of which 10-40% was distributed in all communes. The prevalence of lameness rate was 4.68%. The lameness rate occurred at a high rate, causing economic losses for beef cattle households.

To select new glutinous rice lines suitable to production conditions and quality to meet consumer tastes, seven promising glutinous rice lines (N6, N14, N15, N23, N29, N31, and N32) were conducted field testing, rice quality analysis, and genotype testing for aroma, amylose content, and grain length in Thoai Son district, An Giang province in Autumn-Winter 2020. The results show that there are four glutinous rice lines named N6, N14, N15, and N32 with high yields from 5.47 to 6.88 ton/ha, culm strength (scale 1), leaf blast resistance (scale 1-3), amylose content ranging from 2.0 to 2.1%, very low gelatinization temperature, good head rice recovery (>53%), and all glutinous rice lines carry homozygous genotypes linked to target genes. Therefore, these four glutinous rice lines (N6, N14, N15, and N32) are suitable for testing ecological regions in the coming crop.

The advent of Multidrug-Resistant Tuberculosis (MDR-TB) has significantly complicated the control of tuberculosis, with the prompt diagnosis of MDR-TB presenting a notable challenge. This study aimed to elucidate the molecular characteristics of rpoB, katG, and inhA gene mutations associated with resistance to Rifampicin (RIF) and Isoniazid (INH) in drug-resistant Mycobacterium tuberculosis isolated from Dong Thap province. A total of twenty-nine drug-resistant Mycobacterium tuberculosis isolates (n=29) underwent genomic DNA extraction followed by Next-Generation Sequencing (NGS) technique. This analysis facilitated the identification of mutational patterns within the rpoB, katG, and inhA genes. The results showed that Ser450Leu mutation was the most prevalent, occurring in 58.6% of the rpoB gene sequences. Additionally, a novel mutation, Ser254Pro, was identified in 3.4% of the samples. The study also documented seven other mutations within the rpoB gene: Gln432Lys, Asp435Tyr, Asp435Val, His445Tyr, His445Leu, Ser450Cys, and Leu452Pro. Within the katG gene, two mutations were documented: Ser315Thr, with a prevalence of 82.8%, and Arg463Leu, observed in 96.6% of the isolates. Additionally, the inhA gene exhibited a singular mutation, Ile194Thr (representing 3.4%), which is implicated in conferring resistance to Isoniazid (INH).

The environmental factors can considerably affect the growth and contents of phytosubstances in higher plants. The experiments studied the effects of different light intensities and fertilizer formulas on the growth and development of Angelica acutiloba. The study was conducted the College of Agriculture, Can Tho University from January 2022 to July 2023, aiming to find the suitable light intensity and fertilizer formula for the growth and quality parameters of the potted Angelica acutiloba Kitagawa plant. The results showed that: (i) Angelica acutiloba Kitagawa plant in pots grew and developed well at 25% of sunlight intensity condition and (ii) The most suitable fertilizer ratio: 1,01g N - 0,58g P2O5 - 1,49g K2O were for the potted plants in 25% sunlight intensity condition. Consequently, the weight of rhizome, and the total content of phenolic and flavonoid illustrated the highest (205 g/plant, 44,8 mg/g và 282 mg/g, respectively), which are significantly different from those grown at other fertilizer ratios. The experiment only evaluated the effects of fertilization and light intensity on this potted plant. Thus field verification tests should be continued to obtain a better basis for actual large-scale production.

This study aims to examine the impact of various factors on the outcomes of duck production employing fixed effect (FE) and random effect (RE) regression methods. The research analyzes data from 96 households engaged in raising local ducks over a span of 3 years, from 2019 to 2021, in Luc Yen district, Yen Bai province. The Hausman test results indicated that the FE model is more suitable than the RE model for this case. The study found variables such as education level and gender did not statistically significantly affect the efficiency of duck farming. On the other hand, number of ducks, and feed had positive significant impacts while vaccine, veterinary medicine and age had a negative impact on outcome variables. The results showed that farmers faced difficulties in disease control and the use of vaccines and veterinary did not effective. The study suggests several measures to enhance efficiency in duck production.

This study aimed to evaluate the effects of UV exposure time on the spawning of black apple snails, Pila polita. The experiment was conducted in 1 m3 tanks (1×1×1 m) with a density of 15 pairs of broodstock snails/tank where the height of the water column at the beginning was 40 cm. The experiment included six treatments with 5 different water exchanging regimes: 1) Control (UV0); 2) UV irradiation time of 15 minutes (UV15); 3) UV irradiation time of 30 minutes (UV30); 4) UV irradiation of time 45 minutes (UV45) and 5) UV irradiation time of 60 minutes (UV60). Each treatment was replicated 3 times. The broodstock snails in the treatment UV-15 released the highest egg clutches, reproductive frequency, and efficiency rates (13.8 clutch/m2; 4.58 clutch/day/m2; 91.7%) and UV30 (13.7 clutch/m2; 4.56 clutch/day/m2; 91.1%) were higher and different (p

The study was conducted to determine the appropriate bottom type for commercial culture of babylon snails (Babylonia areolata) in a recirculating system. The experimental design incorporated five treatments, each replicated three times, utilizing tanks with an area of 83.3 m² per tank. These were arranged in five circulating systems, each containing different substrates. The average size of the snails used was 0.2 ± 0.001 grams per snail. The stocking density was set at 2,500 snails per square meter. Five types of experimental substrates included a sand-free substrate with nylon growth media (NT1); a sand-free substrate utilizing cotton-based growth media (NT2); a bi-layered substrate incorporating one sand layer (NT3); a double-floored substrate with two layers of coral and sand (NT4); and a single-floored substrate with a dual layer of coral and sand (NT5). After 176 days of culture, the results showed that babylon snail raised in a NT5 gave the best results, snails burrowed deep in the sand and effectively captured preys, snail size was 6,65 ± 0,044 g/snail, growth rate reached 36,7 mg/day, harvest rate at 11,77 ± 0,061 kg/m2, FCR reached 2,31 ± 0,012 and survival rate reached 70,3 ± 0,36%. The NT1 and NT2 give poor results, snails often ceased feeding, don’t close the snail cover, and secreted an excessive amount of mucus, suggesting that these bottom typs are not suitable for the biological characteristics of snails living buried in the sand.

Infections caused by Streptococcus agalactiae (SA) and Vibrio parahaemolyticus (VP) can cause high economic losses in aquaculture. Difficulty and time-consuming procedures were observed in transporting hazardous sample collection from farmed fish to the diagnosis laboratory. Effective methods for collecting, storing, and transporting fish and shrimp samples at the farms are needed worldwide for disease surveillance. This study investigated the biosafety or inactivation capacity and perseverance of SA and VP stored on Flinder Technolory Associates (FTA) cards. To evaluate the bacteria inactivation capacity of FTA cards, bacteria cells or fish/shrimp tissues were impregnated on FTA cards and inoculated on broth media for 24 h, 48 h, and 72 h. In addition, bacterial DNA of SA and VP stored on FTA card at 4oC for 1.5-15 months was evaluated by PCR. The results showed that all tested bacteria were inactivated after storage on FTA cards and the PCR was successful detection of SA and VP after 13-15 months of storage. This study indicates the use of FTA cards provides a safe, simple collection, easy transfer, storage and PCR detection of bacterial pathogens.

The study was conducted to monitor water quality changes in shrimp - mangrove farming in Ca Mau province for a period of 12 months. Water samples were collected monthly in 9 ponds. The results showed that the water quality in shrimp-mangrove was quite fluctuating, especially in the months of the rainy season from June to September of the year. However, the water quality parameters are still within the appropriate range for the growth of shrimp and crabs. The salinity level in the ponds was quite high, an average of 27.8±3.7 ppt, ranging from 15.7 to 34.0 ppt. The concentration of nitrogen (TAN:NH3/NH4+, NO2- and NO3-) and phosphorus (PO43-) dissolved in water were low. Hydrogen sulfide (H2S) concentrations in the water are low and do not pose a threat to aquatic life in the aquaculture pond. The forest area in the shrimp-mangrove farming can affect the concentrations of TN, TP, and chlorophyll-a in the water, which can cause eutrophication and water pollution. Due to the high TSS levels, it is important to monitor the water quality when supplied to the pond, especially during stocking.

Teaching multimodal text writing according to students' capacity approach in Literature subject grade 10 is a necessary task to help teachers understand and properly and well implement the requirements to achieve writing skills in the Program general education in Literature in 2018. However, teaching multi-method text writing for 10th grade students in the 2018 general education program in Literature is still tricky and needs more public interpretation the tool helps students correctly understand the new ideology of the program and successfully implement innovation requirements. This study focuses on presenting multimodal texts and multimodal texts in 10th grade Literature education books, proposing measures to teach multimodal text writing for 10th grade students and pedagogical experiments, creating a premise for improvements in the process, methods and techniques of teaching multimodal text writing according to the student capacity approach in Literature subject grade 10.

The knowledge of "Oscillations" and "Waves" is essential content in the high school Physics program, these contents are oriented to implement teaching with the approach of graphs to ensure the requirements of the program. Graphing software, especially Desmos, provides visualizations of graphs in static and dynamic modes, making teaching knowledge related to sine graphs more effective. The study focuses on exploiting and using Desmos, and evaluating its effectiveness through teaching the knowledge of “Oscillations” and “Waves”. Through the convenient sampling method, the pedagogical experimental method was used on 161 students of An Bien High School (Kien Giang). The results have introduced several ways to exploit and use Desmos in teaching Physics, contributing to improving the quality of teaching in high schools.

Vietnamese is both an important subject in high schools and a tool to help students communicate, think and learn other subjects. To teach Vietnamese is to meet the General Education Program 2018, approach the current trend of modern education, and help students achieve the required competencies, our article presents how to build supplementary exercises of Vietnamese subject to develop vocabulary competency for elementary students.

This study aims to investigate the factors affecting agricultural tourism development in Phong Dien District, Can Tho City. Data were collected from 157 tourists through convenient sampling and snowball sampling. Scale reliability analysis, exploratory factor analysis, and multiple linear regression analysis were conducted to examine the collected data and identify the key factors influencing agricultural tourism development. The research findings identify six factors that influence the development of agricultural tourism in Phong Dien District: safety and security, prices, agritourism resources, technical facilities, labor resources, and infrastructure. The results of this study provide stakeholders with fundamental issues about the development of agricultural tourism in Phong Dien District to devise directions and solutions for future development.

This study was conducted to analyze factors affecting the intention to practice green information technology (IT) of students at Can Tho University based on a survey sample of 180 students. The main data analysis methods used include exploratory factor analysis (EFA) and binary regression analysis. Research results show that four factors including attitude towards green IT, perceived behavioral control, concern for the environment, and consideration of future consequences have a positive influence on the intention of green IT practices of students. This shows that the university should clearly understand students' attitudes to come up with appropriate plans to help students see the meaning and benefits of green IT. In addition, the university should expand the introduction of green IT as well as create conditions for students to experience green IT practices during their studies at the university.

The aims of this study are to examine the factors that influence consumers‘ intention to purchase OCOP-certified products in Can Tho City and to provide some suitable management implications. A convenient sampling approach was utilized to acquire data from 160 customers. The multivariate regression analysis method employed revealed that the OCOP Products, perceived  price, sales locations, understanding of OCOP products, food safety, and subjective norms all have a positive influence on consumers' intention to purchase OCOP-certified products. The findings are enrich the empirical evidence related to consumer behaviour and is one of the first studies on consumer behaviour for OCOP products in Can Tho City in particular and the Mekong Delta in general.

The study aims to investigate the effect of service quality on customers' intention to repurchase event-organizing services in Can Tho. The study uses survey data from 254 respondents who are individual customers and used event-organizing services. PLS-SEM results show the statistical impact of five factors: perceived cost, brand image, distinctiveness, convenience of service, and customer-oriented service on customer satisfaction. Furthermore, the study indicates the direct impact of customer satisfaction on customers’ intention to repurchase event-organizing services. Several management implications have been put forth in light of the research findings to improve the quality of event organization services to enhance customer satisfaction, thereby increasing customers' intention to repurchase event-organizing services in Can Tho City.