In recent years, applications of using Internet of things (IoT) systems have been increasingly developed because of the flexibility in hardware design and data collection. However, the stability over time and security by self-designed systems could be under consideration. This paper presents a method to design an industry IoT standard system in order to improve the security and to maintain the system stability. A SCADA network for controlling PLC S7-1200 through KepServerEx standard is used to monitor collected data from pump stations. The virtual private network (VPN) connection is used to transmit the control signals and collect data from the server to the stations and vice versa. In addition, the system can be monitored through internet using the remote access function. The results showed that the system is stable and can collect data in real time control. The results of this paper are the premise to conduct more in-depth studies on the industrial IoT standards.

This study is aimed to synthesize Fe3O4/lignin materials and evaluate the material's ability to handle methylene blue. In which, Fe3O4 was synthesized by co-precipitation method, lignin was extracted from sugarcane bagasse, and Fe3O4/lignin materials were combined through citric acid binding agent. The as-synthesized materials were evaluated by advanced analytical methods such as X-ray diffraction techniques to determine the structural characteristics of Fe3O4 particles; Fourier transform infrared spectroscopy techniques to determine the presence of molecular bonding in the adsorbent; optical microscopy to determine the surface morphology of Fe3O4/lignin. The saturation magnetization of Fe3O4 particles and Fe3O4/lignin materials determined by vibrating sample magnetometer is 95 and 49.5 emu.g-1, respectively. Fe3O4/lignin adsorption and desorption capacity of methylene blue was evaluated by UV-Vis method. As a result, the maximum adsorption efficiency of Fe3O4/lignin for methylene blue could reach 96.53% at pH 6-7 within 60 minutes and the desorption efficiency was 66.5% at 75 minutes. The treatment of methylene blue was fitted to pseudo-second order model and Langmuir isotherm adsorption model.

Early detection of induction motor failure plays an important role in limiting disruption to industrial production. Sensor-based measurement methods are highly reliable, but the installation of the equipment is time consuming and costly. Building a smartphone’s application to diagnose electric motor problems is a research direction that attracts many groups. This paper proposes to investigate the ability to train and diagnose electric motor faults based on the principle of recognizing scalogram images of motor’s operation sounds, using a deep learning neural network. The audio signals are noise-filtered, amplitude normalized, and scalogram rendering by wavelet transforms. The set of scalogram images is divided into two parts for training and validating the GoogLeNet convolutional neural network. The GoogLeNet is also investigated through changing some basic parameters, in order to determine the best training efficiency. After training, the network is tested on an independent sound signal dataset. The results show that the network is able to identify 3 common motor problems including phase loss, insulating film brush and bearing failure with 94.21% accuracy. The experiment also shows that the development of smartphone’s application for early diagnosing electric motor problems is feasible.

The aim of this project is to study the collision of falling hard objects to develop an algorithm with high efficiency and accuracy for counting postharvest fruit and vegetables that are resistant to damage from collision. A conveyor system has been designed and developed with a plate that had been attached with a load cell and installed at the conveyor output port so that fruit can collide with when falling out. Load cell signals obtained from fruit collision are collected by MyRIO and processed in real-time using LabVIEW software. The preliminary results show that the proposed counting system can count 11,640 coconuts per hour with the accuracy of 97%, which is promising for developing a counting system with high efficiency for real application at current coconut wholesale facilities.

The study is aimed to assess factors affecting the implementation of land use plans which was the basis for proposing solutions to improve land use efficiency in Tan Phuoc district. The study was conducted 72 experts to determine factors and their impact levels using the Analytic Hierarchy Process method (AHP). The results showed that factors about soil quality, water resources, market ability, weather, profit and product price were the ones that had much impact on the implementation of agricultural land use plan. For non-agricultural land, factors about financial of project owners, financial ability of the investor, planners and the project owner are factors that were highly appreciated by experts. Conversely, factors the policy of dealing with violations received little attention. Since then, 9 solutions have been proposed for the implementation of agricultural land use plan. In which, it is priory of implementing solutions to improve soil quality, water sources and consumer product markets. In addition, 11 solutions have been proposed to improve the efficiency of non-agricultural land use plans with an emphasis on solutions on financial supply policies, financial capacity of investors, planners and project implementers.

This study is aimed to assess factors affecting the land allocation, land lease for economic organizations that based on such results, solutions will be proposed to improve efficiency state management of land. The study collected relevant data, interviewed economic organizations and consulted experts to determine the influencing factors and the impact level of factors by multi-criteria evaluation (MCE) method. The results have identified three main factors and 12 sub-factors affecting to land allocation and land lease to economic organizations. Of which, the capital for site clearance and the financial capacity of an economic orgnizations are the most influential factors. Factors supporting loans and land price were less impacting. A set of solutions were suggested to overcome the limitations and level of impact of factors affecting to land allocation and land lease for economic organizations. Of which, solution on capital sources for ground clearance to create a cleared land bank and assessing the financial capacity of economic organizations before land allocation, land lease should be prioritized for implementation in the future.

Presented in the paper are the two types of reliability analysis including the goodness-of-fit  test for transition probabilities and the independent test for simulation data chain. These tests are applied for the simulation data chain having repeatability and seasonality. The simulation data chain is assumed that the Markov chain of order 1 and having stationary transition probabilities. Based on some existing research results on statistical inferences for Markov chains, the two statistics chi-square were established for using in the two mentioned tests. The illustration application is realized on the simulation data chain of the daily clear index sequence generated from the hidden Markov model having four states.

The purpose of this paper is to study the existence of solutions for stochastic equilibrium problems. A new existence result is established based on using notion of random cyclic quasimonotonicity, without convexity assumptions. Some examples are also provided to show the advantages of the result.

In this study, electronic and optical properties of the penta-graphene quantum dots with different sizes or doping by boron (B), nitrogen (N), boron – nitrogen (BN) at various positions are systematically investigated by using the density functional theory in combination with the non-equilibrium Green’s function formalism. Specifically, band structure, density of states, and absorption spectra of all samples are studied in detail. The result shows that electronic and optical properties of the penta-graphene quantum dots not only depend on quantum dot sizes but also dopants. The diversity of electronic and optical properties of the studied samples demonstrates the penta-graphene quantum dots as an excellent candidate for developing electro-optic device.

X-ray diffraction (XRD) spectra obtained from X-ray diffraction spectrometer are often applied in the quantitative study of the structure of powder samples. The XRD spectrum investigation is based on the deviation angle between the incident ray and the diffraction ray of each material to determine its structural composition. Each XRD will be the dependence of the diffraction intensity on twice the diffraction angle having a characteristic pattern according to the spectral peaks. In this article, XRD spectrum is simulated, analyzed and processed by Python software. The XRD spectrum obtained from the experiment consists of many complex peaks that are processed and identified the characteristic peaks for the crystal. The results show that chili powder has a main peak located at the diffraction angle of about 22.010, indicating that the chili powder contains silicate minerals to be determined. Simulation and experimental data will initially be processed to approach machine learning to evaluate the obtained results.

This work belongs to the research direction of differential stability for parametric optimal control problems governed by semilinear elliptic partial differential equations. The article obtains new results in this research direction consisting of differentiability formulas of the solution map of semilinear elliptic partial differential equations and the objective function of parametric optimal control problems, then a formula for computing the regular subdifferential (the Fréchet subdifferential) of parametric optimal control problems is established.

The study aimed to isolate and select high active yeast train from fermented orange juice to produce high quality orange wine. The results of study were followed, 15 yeast strains were isolated from orange juices in Tra Vinh, Vinh Long, and Can Tho. Based on the classification keys of yeasts (morphology, physiology, and biochemistry), the 15 isolated yeast strains were generally characterized as two genera: Saccharomyces and Hanseniaspora. Results of selective experiment from yeasts belong to Saccharomyces showed that the yeast strain TVK1 isolated from orange juice in Tra Vinh showed the best fermented activities such as the fastest fermentation by Durham test (14 hours) the highest ethanol content (13.0% v/v) and lowest remained sugar (7.17 oBrix). The orange wine fermented by the yeast TVK1 with the optimal fermentation parameters 0.15% pectinase enzyme, 23°Brix, pH 4.0 and 107CFU/mL of  yeast cell density inoculated and incubaled at 300C, 8 days of fermentation, the ethanol content has been reached to 13%(v/v). The orange wine product has good smell, taste and color. Identification of yeast by DNA sequencing showed the superior yeast strain TVK1 belong to Saccharomyces cerevisiae.

Spent yeast is the second major by-product of the brewing industry. They are known to be a good source of proteins, vitamins B, and minerals and other valuable ingredients such as β-glucans, mono- and oligosaccharides. With the benefits of spent yeast, this study was conducted to use spent yeast to produce yeast extract that has both nutritional value and phenolic ingredients with antioxidant activity. Brewer’s spent yeast from S. cerevisiae was debittered and hydrolyzed at 50°C in 24 h. The results show that the nutritional content of hydrolysate from brewer’s spent yeast contained 50.73% of protein, 1.45% of fat, and 22.54% of ash content (dry matter). Trace minerals and vitamins were determined, including Na (452.8 mg/L), Ca (29.0 mg/L), K (2,886.8 mg/L), Mg (59.1 mg/L), and B3 (12.0 mg/L). The total polyphenol content in the spent yeast hydrolysate was 105.13 mg GAE/mL. The antioxidant capacity of the spent yeast hydrolysates was evaluated by scavenging free radical of DPPH and reducing power Fe3+ with the IC50 values were 103.89 μg/mL and 2.88 μg/mL, respectively. With the nutritive value and antioxidant activity, the yeast hydrolysate will be a promising material for application in food production and development of functional food.

The objective of this study was to use the quantitative descriptive analysis (QDA) method to evaluate the organoleptic properties of white radish and cucumber fermented with a combination of water and salt in a rice bran medium. Thirty (30) panellists were selected and trained to evaluate various attributes, including color, shape, texture, taste and overall acceptability of two fermented products. Using the principal component analysis (PCA) method, the study identified two important principal components accounting for more than 80% of the variance, 88.75% and 81.40%, respectively, in the sensory attribute analysis data of pickled white radish and cucumbers. The samples were mixed with the ratio of rice bran: water: salt as 49: 48: 3 (sample of pickled radish F3), 49:48:3 (sample of pickled cucumber M3) and 45:52:3 (sample of pickled cucumber M4) achieved the highest sensory value and were the most loved. These findings demonstrated the utility of the quantitative descriptive analysis method in the identification and measurement of organoleptic properties of pickled white radish in rice bran bed.

The study is aimed to find out the suitable kind of substrates for Dahlia variablis Desf. to grow and flower. The experiment was carried out at the net-house of the College of Agriculture - Can Tho University and was arranged in Completely Randomized Design, with 6 replicates, including 5 treatments were 5 different substrate forms. Treatment one was a medium of straw, the other treatments were a mixture of rice husk: coconut coir dust by volume with the ratio 4:1, 3:2, 2:3, and 1:4. Experimental results showed that plants grew and flowered on rice husk: coconut coir dust (2:3) and straw substrates better than other treatments. Growth of plants in rice husk: coconut coir dust (2:3) and straw are similar; however, flower diameter when grown in rice husk: coconut coir dust (2:3) was larger than when grown in straw (8.82 versus 8.03 cm).

A cross-sectional study on 291 female dogs with abnormal genitalia from December 2020 to June 2021 at the Animal Clinic of Can Tho University was aimed to identify the causes, clinical symptoms, and evaluation of the treatment effect in dogs with stump pyometra. A clinical diagnosis method combined with ultrasound was used to evaluate in this study. The research results determined that dogs were stump pyometra, accounting for 16.49%. Dogs were present with popular clinical symptoms such as heavy drinking, vaginal fluids, abnormal abdomen, licking the vulva. Evaluation of the risk factors linked with this disease showed that there was a strong correlation between the factors of injected contraceptives and the kept-free dogs. The surgical method showed a success rate of 100% compared to conservative treatment (40%).

This study was carried out to investigate the effect of various levels of garlic (Allium sativum L.) supplementation in the basal diet on immune response of pheasants against Newcastle disease virus vaccine. One-day-old pheasants (n=90) were allocated to a completely randomized design with three replicates of three treatments. Pheasants in treatment T0 were not supplemented with fresh garlic in the basal diet. Pheasants in treatment T1 and T2 were supplemented with 1% and 2% fresh garlic in the basal diet, respectively. The experiment lasted 12 weeks. All pheasants vaccinated against Newcastle disease virus on days 7, 21 and 60. Six blood samples were taken from each treatment on days 49, 74 and 81. The serum antibody level against Newcastle disease virus was measured by HI test. The results showed that antibody titres of pheasants on days 74 and 81 in treatment T1 and T2 were significantly more than in treatment T0. Fresh garlic supplementation in the diet increased the antibody titre against Newcastle disease virus in pheasants vaccinated against Newcastle disease.

The study was carried out to evaluate the growth and flowering of lisianthus (Eustoma grandiflorum (Raf.) Shinn) when grown on coconut coir dust and rice husk substrates with different mixing ratios at the net-house of the College of Agriculture - Can Tho University. The experiment was arranged in a completely randomized design, including five treatments, which were five different ratios of coconut coir dust and rice husk. Each treatment had eight replicates, and each repetition had equal to one pot, with two plants in each pot. The substrate ratios (v/v) applied for the study were 5:0, 4:1, 3:2, 2:3, and 1:4. The results showed that lisianthus flower plants grew and flowered well in the mixed substrate of coconut coir dust and rice husk at the ratio 2:3 than other mixing ratios. Plant had height (28.2 cm), stem diameter (3.12 mm), plant canopy diameter (13.3 cm), bud diameter (2.94 mm), flower diameter (5.8 cm) and flower height (10.7 cm), time to fully bloom after planting (100.0 days), and flower longevity (10.4 days).

The study was carried out to determine the correlation between morphological and qualitative traits and genotypic characters (single nucleotide polymorphisms - SNP) to identify candidate SNPs for brown rice color as well as the degree of alkali digestion. Brown rice color was observed by sensory assessment. The alkali digestion of 65 traditional rice varieties was evaluated by biochemical method. Solution 1.7% KOH (w/v) was applied for testing these rice cultivars at room temperature in 23 hours. The database of two traits was combined with the 24,946 SNPs database to analyze genome-wide association study (GWAS) through the general linear model approach (GLM). As the results, 18 candidate SNPs were identified for brown rice color on chromosomes 6, 8 and 12. Five candidate SNPs were detected for brown rice color trait, which were located in five distinct genes. Thereby, the allele type of GCTGCATAAGATTTT in 16 candidate SNPs was associated with the brown rice color trait. In terms of alkali digestion trait, only 2 candidate SNPs were found. In which, the candidate SNP of S08_10088669 was associated with the low gelatinization temperature (G allele).

From January 2021 to May 2021, a total of 58 samples (14 pork and 44 environmental samples) were collected at one small-scale and one concentrated slaughterhouses. Applying TCVN 7924-1:2008, it indicated that Escherichia coli were present in a high proportion of 50/58 examined samples (86.21%). The prevalence of E. coli contamination in small-scale slaughterhouses and concentrated slaughterhouses was not statistically different with 92.86% and 80.00%, respectively. The contamination rate of E. coli was 78.57% on pork and 88.64% on environmental samples. The isolation of E. coli on environmental samples was the highest rate on the barns, slaughter floors (100.00%), followed by workers' hands, knives (87.50%), and water samples (75.00%). Evaluating the quality of pork according to the TCVN 7046:2009 standard toward E. coli criteria, only pork at the concentrated slaughterhouses got qualified. E. coli isolates were high resistance against ampicillin (79.17%), streptomycin (62.50%), and amoxicillin/clavulanic acid (54.17%); however, they were still highly sensitive to doxycycline, ofloxacin (83.33%), and cefuroxime, colistin (75.00%). Those E. coli isolates, which showed multiple antibiotic resistance, were accounted for 79.17%, and the common resistance patterns were Am+Ac and Am+Co+Sm+Ac.

In order to find out the appropriate level of nutrients for the growth and flowering of hydroponic Zinnia elegans, a study was conducted at the net-house of the College of Agriculture - Can Tho University from December 2019 to February 2020. The nutrient solution used in the experiment was Hoagland and Arnon (1950) [HO-1950]. The experiment was arranged in a completely randomized design, including 5 treatments with five different nutrient levels. The treatments correspond to different levels of HO-1950 used, 100%, 50%, 25%, 12.5% and 6.25%, whose EC are of 2.80, 1.40, 0.70, 0.35 and 0.175 mS.cm-1, respectively. Each treatment had six replications and each of which corresponded to one pot, one plant in each pot. Experimental results showed that the plants grew well at the nutrient levels HO-1950 50% (EC = 1.4 mS.cm-1) and HO-1950 100% (EC = 2.8 mS.cm-1), plants had height of 16.3 and 15.6 cm, canopy diameter was 13.7 and 13.1 cm, respectively. Plants grown in 100% HO-1950 nutrition had higher number of flowers and flower diameters than in HO-1950 50% nutrition (4.8 flowers and 5.1 cm compared with 4.2 flowers and 4.8 cm) but no statistically significant difference.

This study was conducted to evaluate the growth characteristics, yield and quality of four sweet potatoes varieties in potting condition. The studied site located at a farmer household in Phuoc Thoi ward, O Mon district, Can Tho city and experiment was conducted from June 2020 to December 2020. Experiments were conducted in a randomized complete block design (RCBD) with 4 treatments were four different varieties (Bi do, yellow Japan (HL518), orange Japan (Kokey14), Ta nung) with 10 replications. The tuber yield and the tuber quality were analyzed at harvest. The results showed that the vine length recorded from Ta nung and orange Japan (Kokey 14) variety was lower than those from other varieties. The lowest number of branches was recorded from yellow Japan (HL518) variety. Orange Japan (Kokey14) variety achieved the highest commercial tuber yield (13.1 kg/10 pots), total yield (14.7 kg/10 pots) and carotenoid content (7.2 mg/100 g fresh weight). Yellow Japan (HL518) and Ta nung varieties achieved the highest starch content (over 700 mg/g fresh weight).

The study was conducted to evaluate dynamics of water quality and wastes derived from intensive whiteleg shrimp (Litopenaeus vannamei) ponds with different stocking densities in Soc Trang province. The ponds’ depth was at average of 1.4 m, and pond area was in the range of 3,100-4,700 m2. The low stocking density was 80-90 shrimp/m2, and the high stocking density was 130-140 shrimp/m2. Water samples were collected and evaluated from the first month to the end of one cycle with interval of every 2-weeks. The water quality of the culture ponds at the sampling times was maintained well by the farmers at the suitable concentration for shrimp growth and was in accordance with the QCVN 02-19:2014/BNNPTNT, except for water pH and alkalinity in the high stocking density ponds. However, to produce 1 ton of shrimp, 6,644-8,289 m3 wastewater, 27.9-29.9 m3 siphon water, 145-179 kg COD, 12.5-16.3 kg P and 57.6-77.5 kg N are discharged into the environment via water exchange and siphon. The accumulation of COD, TKN and TP was abundant in siphon water. Therefore, the management and treatment of wastewater and siphon water discharged from intensive shrimp ponds is essential to minimize the amount of wastes entering the environment around the farming area.

The study is aimed to determine the appropriate weaning time to commercial diet for better performance in growth and survival of snubnose pompano (Trachinotus blochii) at the early juvenile stage. The experiment was randomly set up in triplicate with our feeding time points (at 15, 18, 21, 24 days after hatching (DAH)). The fishes were stocked in 100L tanks at 30ppt of salinity and 1 ind/L of stocking density. The fish was initially recorded at 0.03g of BW and 9.02 mm of TL. After 30 days of rearing, no significant difference in total length and body depth (DLG and SGRL, DHG and SGRH) was observed among treatments (p > 0.05), but the treatment fed commercial diet from 15-18 DAH showed significantly higher growth in body weight (DWG và SGRW) compared to 24 DAH treatment (p < 0.05). The fish survival ranged from 91.48 to 97.41%, but no statistical difference was recorded among treatments (p > 0.05). The results suggested that should start the weaning to commercial diet for T. blochii juveniles from 15-18 DAH.

Environmental protection is one of the issues concerned by many countries in the world. In Vietnam, this issue is an important task that requires all departments need to realize the goal of educating people about awareness about environmental protection. The Ministry of Education and Training has defined the objectives and content of environmental education  which are included in the curriculum at all levels from primary to high school. At the primary school level, the content of environmental protection education is integrated into  many subjects at various such as ful, partial, content-related integration and so on. And in fact, this integration also has some problems and challenges. Through a survey conducted at some primary schools in Can Tho city, some solutions are suggested to enhancing the student’s awareness of environment protection.

Improving the quality of theses for undergraduate students in Social Sciences and Humanities is necessary in the context of limited research in these fields at Can Tho University. The grounded theory was applied to study the factors affecting the thesis writing process of students at the Faculty of Social Sciences and Humanities and the Mekong Delta Development Research Institute through a social survey with 20 lecturers and 28 students who have experienced in thesis supervising and implementing from November 2020 to January 2021. The 4S model has been developed which consists of 4 factors influencing thesis writing such as the Student, Supervisor, School and Society. Based on the 4Ss model, the research proposed various solutions to improve the quality of thesis for undergraduate students. Application of grounded theory shows that this is a suitable approach in qualitative research, which can be used for study of emerging issues related to social sciences and humanities at Can Tho University in particular and the Mekong delta in general.

The article is to analyze the characteristics of mythical elements in Vietnamese stories in the first half of the twentieth century. These elements were the result of the inheritance of the myth of human. The mythical elements in Vietnamese stories of this period were analyzed in four aspects: motif, character, space and time. The study contributes to explaining the characteristics of the literature of this period in the journey of inheriting the myth.

The results of performance, the application of science and technology and determinants of performance of enterprises in Vinh Long province were presented in this study. There are two types of data used in the analysis: primary survey data with 53 enterprises selected by random sampling method and secondary data with 1,521 enterprises surveyed in 2019. The analytical methods are descriptive statistics and regression models. The results showed that enterprises have conducted activities in applying the science and technology, innovation and information technology in production, business, and corporate governance stages. The findings also showed that own equity, current assets, and size of the enterprise were factors affecting the enterprise’s performance.

This study was conducted to compare the financial efficiency between biosafety-oriented (BIOS) and traditional (TRAD) duck production models to make suitable recommendations for sustainable development of duck production in the future. Data and information were collected from key informant interview and household surveys with two groups of duck farmers (30 households with BIOS and 30 households with TRAD models) in Mang Thit district, Vinh Long province. Descriptive statistics, T-test and SWOT analysis were used for data analysis. The results showed that the biosafety-oriented duck model brings high efficiency reflected in high survival rate, high yield, large and homogeneous market weight, leading to higher profits, capital and family labor efficiencies than traditional husbandry (P

Rice cultivation is one of economic activities using large areas of land resources in Vung Liem district, Vinh Long province but the scale of farming is uneven effecting economic efficiency. The paper is aimed at comparing financial efficiency of three crop rice production model by different land scales through interviewing 90 farmers in Vung Liem district, including three groups as small, medium and large area of land. Descriptive statistics and analysis of variance (one-way ANOVA) are applied to analyze and compare the collected data. The results showed that rice cultivation brings profits and jobs to farmers. Financial efficiency with family labor cost increased by land scales, from 0.65 in the small land size group to 0.77 in the medium land size group and 0.88 in the large land size group (P