The soil pressure sensor is used to measure the soil stress value at the installation point within the soil mass, at the interface position between the soil and the structure of the construction work. The sensor data is greatly influenced by their working conditions. Therefore, sensor calibration is essential to  evaluate the soil pressure values ​​for construction purposes. The research focuses on sensor calibration. It uses a 30mm diameter rigid diaphragm type of earth pressure cell (EPC) from the Kyowa company to compare its sensitivity in experiments under different loading conditions in two different environments. The results show that the sensor provides higher sensitivitythan when calibrated in sand with a sand layer thickness of 6.5 times the DEPC. The calibration equation achieved is linear, with a calibration coefficient of 0.9999 and an adjusted R2 value of 1.0 for the fluid environment. The corresponding coefficients are 0.40411 and 0.99609 for the sand environment. This could be fundamental research applied for measuring soil stress in practice.

In this study, the influence of electrospray solution (including kind of solvent, solvent concentration, and chitosan concentration) and the coaxial electrospray process (including the voltage of needle tip, spray speed, and the distance from the nozzle to the substrate) to the berberine@chitosan/piperine nanoparticles, which were prepared by electrospraying method, were investigated and analyzed. For the electrosprayed solution, two types of solvents were investigated (e.g acetic acid and citric acid), in which acetic acid was chosen to use with the optimum concentration of 90%; the optimum chitosan concentration was 4%. The optimal solution has a conductivity of 745 µS.cm-1, a viscosity of 920 mPa.s, and a surface tension of 30.9 mN.m-1. For the coaxial electrospray process, the optimal sample has a voltage of 17 kV, a spray rate of 0.1/0.2 mL/h, and a distance of 10 cm from the nozzle to the substrate. With the optimal data, the obtained berberine@chitosan/piperine nanoparticles have an almost spherical shape, a core-shell structure, a relatively uniform particle size distribution, and a particle diameter of 203.78 ± 58.56 nm.

Berberine is a plant alkaloid, is used in traditional medicine. Berberine has antibacterial, anti-inflammatory, anti-cancer, and hypolipidemic activities, etc. However, berberine is less solubility in water and has poor bioavailability. The aim of this study is to determine the ratio of surfactant to make berberine nanoparticles and evaluate the antibacterial efficacy of berberine nanoparticles against S. mutans. Berberine nanoparticles were made by roll milling method with different ratios of Tween 80 and Sodium Laureth Sulfate (SLS). The samples were tested the characterization by X-dray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), UV - Vis absorbance spectroscopy. The antibacterial efficacy of berberine against bacteria cause tooth decay was tested by the agar diffusion and the microdilution method. The obtained results demonstrated that a stable and unmodified nanosystem with an average nanoparticle size of 40–65 nm was produced when Tween 80 and SLS were combined in a 3:1 ratio. Berberine nanoparticles was inhibited growth of S. mutans - the main cause of dental decay.

This paper describes the operation principle and evaluation of an isolated voltage sensor using AMC3330 for the power electronics applications. The isolated voltage sensor can sepearted the high side voltage of the power electronics devices from the controller, monitor components and the opeators during opeartion, research, and development. The isolated voltage sensor be able to transfer a high frequency analog signal through an isolation barrier. Additionally, a low voltage side single-power supply of the AMC3330 simplifies the design and opeation of the isoltaed voltage sensor. The experimental results show the effectiveness of the isolated voltage sensor for the power electronics applications.

Conservation and dissemination of the cultural values inherent in culinary traditions constitute a persistent challenge requiring continuous preservation within each nation. There is a limited focus on research and AI (Artificial intelligence) applications in this domain, with most studies centering around image classification and lacking specific dish-related information. Realizing the significance of core knowledge and detailed insights into dishes that tourists seek, this article introduces an AI framework for Vietnamese cuisine. Specifically, it presents a specialized ontology for storing pertinent information regarding Vietnamese specialty dishes alongside a model for image classification. The essential contribution lies in achieving a dish image classification accuracy of over 96% and providing corresponding cooking recipes from the ontology.

This study aimed to estimate the carbon accumulation capacity of Melaleuca cajuputi Powell forest in U Minh Ha National Park, Ca Mau province. Data were collected by measuring 12 plots to different peatland thicknesses (T (cm)< 40, T (cm)= 40 - 70, T (cm)= 70 - 100, T (cm)= 100 - 120) and analysis on 21 trees. The data were analyzed through equations between different factors. The results showed that the equations that best describes the relationship between biomass and carbon with diameter is Y = (a + b/X)2. There are differences between the carbon content of Melaleuca forest populations at peatland thicknesses: T (cm) < 40 was 237.51 ton/ha, T (cm) = 40 - 70 was 167.73 ton/ha, T (cm)= 70 - 100 was 42.89 ton/ha, T (cm)  = 100 - 120 was 58.87 ton/ha. The total CO2 sequestration value of Melaleuca forest in the study area is 364,140,005,825 VND.

In this study, we utilized the dragon fruit branches to produce biochar through pyrolysis at 550 oC. This biochar was used to remove methylene blue in wastewater. The results showed that at the MB concentration of 40 mg/L, as the adsorption time is 90 mins, the MB adsorption efficiency reached > 95% for 0,3 g of biochar in pH solution of 8-11. Researches on adsorption isotherm model showed that the adsorption process of MB by biochar obtained from pyrolysis of dragon fruit branches is consistent with Langmuir monolayer adsorption model with R2 = 0,9889 and qmax=13,7mg/g. Biosorption kinetic data were properly fitted with the pseudo-second-order kinetic mode. All these results demonstrated that the biochar produced from dragon fruit branches by pyrolysis method, which can be applied in wastewater treatment field as the absorbent, helped to solve the invironmental problem caused by both dragon fruit branches and MB.

In this work, graphene (GR) materials were fabricated from natural graphite rods via electrochemical exfoliated approaches with different voltages applied to electrodes, such as constant voltages 6 V, 8 V, 10 V, and staircase potential 0-2 V and 2-10 V in ammonium sulfate (NH4)2SO4 solution. The products were characterized by Zeta potential, field emission-scanning electron microscope (FE-SEM), atomic force microscopy (AFM), and Raman spectroscope (Raman) to examine the characterization and structure of GR. Zeta potential of GR-010 with staircase potential 0-10 V is -47.7 mV, showing the effective dispersion of GR in water due to excellent linked ability with negative ions at the surface and boundary of GR. FE-SEM and AFM images show that the average thickness of GR-010 is 1.8 nm corresponding to 3-5 single-layers, respectively, less than Gr-6, GR-8, and GR-10. Raman image of GR shows that the defect level of GR-010 is lower than GR-6, GR-8, and GR-10 with ratio ID/IG = 0.36.

Representative wave and parametric wave approaches are popular methods for computing wave height. However, the representative wave method showed low accuracy for computing significant wave height. In contrast, the parametric wave approach performs well in root-mean-square wave height transformation. Therefore, this paper investigates feasibility of applying a parametric wave model to calculate significant wave height. Six parametric wave models are collected to examine their accuracy for modeling considerable wave height, and these models are modified to improve prediction performance. A large amount of wave data is gathered for examination and calibration. The results show that the existing models predict significant wave height with a root-mean-square relative error of 9,9%-16,6%. After modifying them, the error ranges from 6,4%-9,5%. Among the six models, DT23 performs the best result for significant wave height transformation prediction. These six models are tested with other data to verify the wave height estimation capacity. The verification results indicate a significant decrease in error. Therefore, DT23 with modification is recommended for computing significant wave height transformation.

Syzygium jambos (L.) leaves are used medicinally in traditional medicine to treat diarrhea, digestive disorders, diuretics, antipyretic and lung diseases. In this study, Syzygium jambos (L.) leaves were collected in Kien Giang. The ethanol extract was fractionated with n-hexane and ethyl acetate solvents, respectively. By column chromatography, four compounds were isolated, including Stigmasterol (1), 2-phenyl-4H-chromen-4-one (2), Chavicol β-D-glucopyranoside (3) and rutin (4). The structures of the compounds were determined based on NMR spectral analysis and comparison with the data in the references. Compounds (2) and (3) were isolated from this plant for the first time.

In this paper, we give some extended versions of Ekeland’s variational principle for interval-valued functions on the completed metric spaces based on the outer semicontinuity. These results are novel and different from recent results on this topic. Many examples are given to compare and illustrate the main results.

In this paper, some extended versions of the classical Weierstrass extreme-value theorem for interval-valued functions was shown. The results are new and general to the classical Weierstrass theorem. Many examples are presented to compare and illustrate the obtained results.

In this paper, the inner semicontinuity and  weakly boundedness from below of interval-valued functions were used to get a  generalized Ekeland’s variational principle. Many example are provided to highlight relations of this results to existing ones, including their advantages

The present study aimed to evaluate the reproductive performance of 2 lines of Ac chicken hens with and without feathers on legs at 22-29 weeks of age. This study was carried out at the chicken farm in Phong Dien district, Can Tho City, from October to December 2022. A total of 60 hens at 22 weeks old were arranged with 2 treatments, each treatment was repeated 30 times, each replicate was a hen raised individually in a cage. The research results showed that the laying rate, egg weight, feed consumption, feed/egg consumption, and feed conversion ratio (FCR) had no statistically significant differences between the two treatments (P>0.05). However, laying rate and FCR at 27 weeks old were found a statistically significant difference (P

Syzygium zeylanicum (L.) DC. spray-dried microcapsules were a rich source of phenolic content and possessed relatively high antioxidant and in vitro antidiabetic activities. The study aimed to investigate the kinetics and thermodynamic degradation of phenolic content and biological activities of Syzygium zeylanicum (L.) spray-dried microcapsules under stimulated storage conditions of temperature (40°C and 60°C) and relative humidity (75% and 90%) for 50 days. The results indicated that the reduction rate of phenolic content and biological activities of spray-dried microcapsules depended on storage conditions. Amongst them, storage at low temperatures under low relative humidity could protect phenolic compounds, reducing the degradation rate of biological activities. The thermodynamic characteristics were found in the sample stored at 40°C under low relative humidity (75%) with the respective longest haft-life (t1/2) and decimal reduction time (D) of 346.57 days và 1,151.29 days; the activation energy (Ea) and Q10 values of 1.2 and 17,562.7 J mol-1. The phenolics degradation followed in the first-order model with the degradation constant in a range of 0.002 - 0.006 days-1  

The composition of parasitic nematodes related to sugarcane on specialized land and Rice-sugar rotation in Phung Hiep district, Hau Giang province was surveyed. Nematodes from soil and root samples were extracted based on the improved Baermann method. The results recorded 6 nematode genera, of which Tylenchorhynchus genus had the highest frequency (100%); including 4 species identified as Tylenchorhynchus leviterminalis, Tylenchorhynchus nudus, Helicotylenchus crenacauda and Hirschmanniella mucronata; Hirschmanniella genus is only present in rice-sugarcane rotation lands. Based on the characteristics of the communities, the species T. leviterminalis is important in both specialized and Rice-sugar rotation models. Comparing the characteristics of parasitic nematode communities between two sugarcane cultivation models, initial results show that the Rice-sugar rotation model was ineffective in managing sugarcane parasitic nematodes.

The study on growth performance, yield of green biomass, and nutritional composition of 5 varieties of maize were conducted at the Ngoc Hoi district, Kon Tum province in the winter-spring season of 2022. The experiment was carried out in a randomized complete block design, consisting of 3 blocks corresponding to 3 replications, each block has 5 plots corresponding to 5 varieties (LVN1461, VN172, VN5885, VN8960 and NK7328) arranged randomly. The size of each plot was 35 m2, with the density of plants at 70 x 20 cm. The results showed significant differences in the average weight of plants and green biomass yield of types at various stages of milk, dough, and dent (p

To assess the effects of fertilizer application rates and organic fertilizer types on the growth, yield, and quality of two types of kale (siberian dwarf kale and curly kale). The experiment had two factors, six fertilizer combinations, and three replications. It was set up in a completely radomized design. Factor A was two levels of NPK100% NPK (120N-48P2O5-176K2O) and 50%NPK; and factor B was an organic fertilizer (chicken dung and vermicompost). The results demonstrated that the pH and organic matter in the soil were unaffected by the NPK dose, but, the amount of NPK impacted the soil's available N and P. When NPK was applied at a level of 100%, the available N and P in the soil were greater, statistically different from when NPK was applied at a level of 50%. Applying organic fertilizer dramatically increased soil organic matter, pH, and available N and P nutrients. Apply 50% NPK combined with 20 tons/ha of chicken manure for the highest plant height, stem diameter, number of leaves/plant, leaf weight, leaf length, and highest yield. The nitrate content at the level of 100% NPK application did not exceed the  World Health Organization (WHO) allowable limit, increasing Brix.

The study was carried out to evaluate the effects of two bacterial strains, Curtobacterium citreum HH5 (HH5) and Curtobacterium luteum MT6 (MT6) on the growth and yield of mustard green under greenhouse conditions. The experiment was arranged in a completely randomized design with 5 treatments and 3 replicates over 2 consecutive crops. The collected parameters include growth, yield, and soil characteristics. The results showed that the baterial strain HH5 stimulated an increase in plant height, leaf size, chlorophyll content, and electrical conductivity in soil over 2 consecutive experimental crops. In particular, HH5 increased the yield of mustard green up to 11.7% (in crop 1) and 36.7% (in crop 2) compared to the control. The strain MT6 alone or combining two bacterial strains increased leaf size and yield in crop 2 by 19.6% and 11.2%, respectively. In summary, the baterial strain HH5 has a high potential for developingprobiotics to stimulate the growth and yield of vegetables and soil EC improvement.

Upland rice is a crop that can adapt to living conditions without water. Along with the characteristics of ecological regions, upland rice is very diverse in morphology and rice grain quality. A study was carried out on the agro-morphological and genotypic characteristics of 29 upland rice varieties cultivated in the Mekong Delta . Through the evaluation criteria of morphology and quality with criteria such as amylose content, gel strength, gelatinization temperature, and aroma, combined with genotyping by molecular markers SSR. The results showed the morphological and quality characteristics of the 29 studied rice varieties. The study selected 3 rice varieties, Pum Pan Dam, Te Thom, Lua Bac 1, and 2 varieties of sticky rice Khau Hut Lai (Nep), and Nep Nin Luong, with good morphological characteristics such as high yield and good quality, belonging to the soft rice group (amylose content is less than 20%, gel strength is over 60 mm, sizing resistance is level 5.6, and a light aroma suitable for current breeding requirements). , All five varieties carry genotypes that were tolerant to drought conditions. This results will provide the genetic resource for future breeding programs.

This study was carried out to determine the density and composition of nematodes communities associated with various citrus species in the Mekong Delta, including da xanh pomelo (Citrus maxima) (Ben Tre), Nam Roi pomelo (Citrus maxima), kumquat (Citrofortunella macrocarpa (B.) Wi.) (Vinh Long), mat orange (Citrus sinensis (L.) Osb.) (Hau Giang), soan oranges (Citrus sinensis (L.) cv. Soan) and hong mandarin (Citrus nobilis var. chrysocarpa Lamk.) (Dong Thap), Tau lemons (Citrus limonia Osb.) (Tien Giang). Seven species of parasites were identified, including Pratylenchus sp., Tylenchulus semipenetrans, Rotylenchulus sp., Tylenchus sp., Helicotylenchus sp., Tylenchorhynchus sp., and Criconemella sp.. As a result, average densities of parasitic nematodes in soil (individuals per kg of soil): were estimated, particularly Tylenchulus semipenetrans (1,813), Pratylenchus sp. (97), Tylenchus sp. (48), Helicotylenchus sp. (46), Tylenchorhynchus sp. (17), Rotylenchulus sp. (10), Criconemella sp. (0.2). Their densities in roots (individuals per g of roots) were calculated as follow: Pratylenchus sp. (24) and Tylenchulus semipenetrans (6). Composition of parasitic nematodes in soil were statisticized as: Tylenchulus semipenetrans (89.1%), Pratylenchus sp. (4.76%), Tylenchus sp. (2.59%), Helicotylenchus sp. (2.25%), Tylenchorhynchus sp. (0.83%), Rotylenchulus sp. (0.48%) and Criconemella sp. (0.01%); in roots: Pratylechus sp. (83.1%) and Tylenchulus semipenetrans

Community promotion has recently become extremely popular via media, particularly through video clips. Creating video clips of speaking English helps develop speaking skills in high school students. This study explores the perceptions of teachers and students about developing English speaking skills and activities to create video clips through which English-speaking skills are developed. In the study, the authors present a series of activities of the Panorama Project to produce video clips to promote the community. One of video clips was uploaded on YouTube page and shared to other social networks. Participants watched video clips and answer questionnaires about the topic. Data were collected from 1.304 (n=1.304) teachers and students, including 608 teachers and 696 high school students. The results show that teachers and students are very interested in activities to develop English speaking skills despite the limited practice environment. Both teachers and students highly agree with the development of video clips to promote the community, thereby developing English speaking skills in high school students.

This research presents experimental results using the Padlet tool to organize 6th graders to perform writing activities. The experiment was conducted from October 2022 to January 2023 with the participation of 40 students in grade 6X of P.T Secondary School (Cai Rang District, Can Tho City) with two types of writing: retelling an old story and retelling your own experiences. The actual data has been statistically and processed by both quantitative methods. The results show that students' writing skills, such as (1) Finding ideas and making outlines, (2) Writing paragraphs (introduction and conclusion), and (3) Editing skills, have changed significantly through the implementation process practicing on Padlet.

In the modern trend of higher education accreditation, scientific research is an important criterion for evaluating the quality of the training program's instructional staff. Within the scope of this article, the author focuses on clarifying three primary issues: the concept of scientific research activities, the current status of scientific research activities, and suggestions for enhancing the scientific research capacity of teachers to contribute to the enhancement of training quality. In the analysis of the situation, the author concentrates on a case study at Can Tho University - which plays a central role in the Vietnamese higher education system. The article employs a questionnaire to survey 180 teachers at Can Tho University. . The results of the survey indicate that teachers recognize the significance of scientific research; however, the scope of research is still concentrated in the country and a few strong fields of the university: 80% of teachers believe that scientific research activity is important for them, while only 21% of teachers surveyed say they have no difficulty publishing internationally. This study also investigates the challenges lecturers face in scientific research, proposing solutions to promote teachers' scientific research activities and enhance the quality of training.

The article utilized the Bayesian approach to investigate the influence of oil prices on the profitability of commercial banks, as represented by the ratio of profit to total assets or ROA. The research dataset was collected at 28 commercial banks from 2011 to 2021. The posterior probability fully supported the negative impact of oil prices on ROA. Net interest margin and non-interest income ratio had a positive effect on ROA. Meanwhile, the capital adequacy ratio, the expense-to-income ratio and the liquidity ratio showed opposite effects. Statistical evidence about the influence of bank size had not been clearly confirmed. Research results have provided significant statistical evidence on the impact of oil prices and internal factors on Vietnamese banks' profitability.