This study proposes a deep learning-based model using ResNet50 for image classification in scientific articles to detect similarity and improve image similarity search. The model employs a pre-trained ResNet50 combined with a dataset of 12,049 images categorized into 11 classes extracted from the Can Tho University Journal of Science using PyMuPDF. The Activation Map Visualization method highlights training data regions through the first six channels of each different layer in the deep learning model. The results indicate that the proposed approach achieves exceeding 90% reliability in detecting image similarity and can identify the original article’s author and publication year. ResNet50 is also compared with AlexNet and VGG16, demonstrating superior generalization capability for complex image recognition tasks. The result establishes a foundation for developing an image similarity detection system for scientific publications.

The main purpose of the study is to analyze the dynamics of space frames using the dynamic stiffness matrix method. The research presents the construction of dynamic stiffness matrices for straight frame elements subjected to axial force, torsion, and bending, taking into account the effect of axial force of the frame. These matrices are then used to develop the dynamic stiffness matrix for generalized frame elements and apply it to the dynamic analysis of space frame systems, including determining natural frequencies and mode shapes, as well as analyzing structural displacements under harmonic dynamic loading. A comparison of the results obtained using the dynamic stiffness matrix method with those obtained using the finite element method demonstrates the accuracy of the dynamic stiffness matrix method.

This study was conducted to investigate the influence of extraction conditions on the antibacterial ability of Ly Son garlic extract (Allium sativum L.) against Escherichia coli (E.coli). The results showed that the best condition to extract diallyl disulfide and trisulfide in Ly Son garlic was soaking in a solvent of distilled water:ethanol (1:1, v/v) with the ratio between dry weight of garlic and volume of solvent was 20 mg/ml, extracted for 2 hours at 30oC and extracted only once, ultrasound waves have no effect in enhancing the biological activity of the extract. The optimal extract had a minimum inhibitory concentration against E.coli of 2.5 mg/ml. These results confirmed the anti-E.coli effect of Ly Son garlic extract extracted under optimal conditions.

Domestic wastewater contains organic and inorganic compounds. Especially nitrogen is present in the form of ammonium and nitrate. High concentration of nitrogen in wastewater increases toxic compounds harmful to aquatic organisms and humans. Study on the efficiency of domestic wastewater treatment was carried out using activated sludge tank model combined with carriers. When the COD, BOD5, SS, and NH4+ concentrations of wastewater were 437.33 mg/L, 279.13 mg/L, 84.29 mg/L, and 31.87 mg/L, the treatment efficiency of the model was 93.17%, 89.53%, 88.96%, and 97.61%, respectively. The treated wastewater with a high N03- concentration (100.57 mg/L) was subsequently used for culturing Spirulina platensis. When 40×103 organisms/mL of microalgae were inoculated in the treated wastewater, NO3- was completely removed after 3 days of inoculation, and the microalgal biomass obtained was 48.07×103 organisms/mL. Similarly, when 20×103 organisms/mL of microalgae were inoculated, the resulting biomass was 30.44×103 organisms/mL. The value of pH, COD, BOD5, SS and the concentration of NH4+, NO3- in wastewater treated by activated sludge tank model combined with carriers followed by algae cultivation reached level A according to QCVN 14:2008/BTNMT.

The automatic and continuous updates along with predictions of changes in vegetation cover are essential prerequisites for identifying solutions for rational planning and resource management. This study classified automatically various vegetation covers using Landsat images from 1988 to 2024 in Bà Rịa – Vũng Tàu province. The Random Forest (RF) algorithm on the Google Earth Engine (GEE) platform was applied to classify vegetation. Subsequently, the Hidden Markov Model (HMM) and Bayesian network were applied to forecast the distribution of vegetation cover in the future (up to 2030). The classification and prediction results, with high accuracy (over 87%), demonstrate the advantages of applying artificial intelligence (AI) in remote sensing, supporting monitoring efforts and decision-making in planning for resource and ecosystem management activities.

Photo-switchable molecules have been recently utilized for many practical applications, especially for chemo-sensors. In this research, a smart fluorescent sensor SP-N3 was synthesized via simple reactions and its chemical structure was characterized by 1H, 13C-NMR and HR-MS spectra. Under Vis/UV light, the colorless and non-emissive close form of SP-N3 was reversibly photoisomerized to the colored and emissive open form of MC-N3. MC-N3 displayed multi-stimuli responsive optical behaviors under various conditions of solvents, UV/Vis lights, pH media, and metal ions. The red color and emission of MC-N3 were easily quenched by ferric ion interaction, which was utilized for Fe3+ detection in water with high selectivity and sensitivity (LOD = 1.683 and 0.690 mM) via UV-Vis and fluorescent techniques, respectively.

Clustering authors based on the keywords of their scientific papers using SVD and K-means algorithms. First, the keywords are represented using TF-IDF, followed by applying SVD to reduce dimensionality while retaining important features. Next, the K-means algorithm is used to cluster the papers according to the similarity of their keywords, thereby grouping authors with similar research topics. This combination helps optimize text data analysis effectively

The paper studies a class of Hindmarsh-Rose 3D model. First, necessary conditions for the parameters of the system are established in order to have a table fixed point which presents the resting state for this model. After that, using the Hopf’s theorem we prove the existence of a Hopf bifurcation, a critical point where a system’s stability switches and a periodic solution arises. More precisely, it is a local bifurcation in which a fixed point of a dynamical system loses stability as a pair of complex conjugate eigenvalues cross the complex plane imaginary axis. Moreover, with suitable assumptions for the dynamical system, a small-amplitude limit cycle branches from the fixed point.

This research assesses the polyphenol and flavonoid contents, antioxidant activity, and α-glucosidase inhibitory activity of the flowers, leaves, and stems of Cosmos bipinnatus using two different extraction solvents: 96% ethanol and 50% ethanol. The findings reveal that 50% ethanol is more effective at extracting polyphenols, while 96% ethanol extracts more flavonoids. Among the plant parts, the flowers contain the highest levels of polyphenols and flavonoids, followed by the leaves and stems. Extracts from the flowers also demonstrated the strongest antioxidant activity, as evaluated by IC50 values in DPPH assays (from 24.78 to 28.62 µg/mL) and reducing power assays (0.34 to 0.36 µg/mL). Additionally, the flowers and leaves exhibited better α-glucosidase inhibitory activity compared to the stems, with the 96% ethanol extract from the flowers showing the strongest inhibition (IC50 = 28.92 µg/mL), approximately 1.6 times higher than the 50% ethanol extract. The correlation between the concentrations of the investigated compounds and the observed bioactivities further emphasizes the crucial role of these compounds in the biological activities of Cosmos bipinnatus (p < 0.01).

This study aimed to analyze and evaluate the scale, consumption status, and quality of products produced by the honeybee industry in various districts of Tien Giang Province. The results indicated that the beekeeping scale encompasses 25105 total beehives recorded from 2018 to 2022, with a total honey production of 448120 kg, bee pollen of 3000 kilograms, and beeswax of 16144 kg. The average prices of the products traders purchase were 124000 VND per kg of honey, 135000 VND per kg of bee pollen, and 110000 VND per kg of beeswax. The physicochemical properties of honey in the three districts of Tan Phuoc, Cai Be, and Tan Phu Dong were also determined, including moisture content from 19% to 22%, insoluble solid content from 0.09 ± 0.003 to 0.158 ± 0.018%, free acid content from 30.49 ± 0.49 to 46.99 ± 2.29 mg acid equivalent/1000g, hydroxymethylfurfural (HMF) content from 0.038 ± 0.01 to 0.98 ± 0.02 mg/100g, diastase activity from 4.09 ± 0.16 to 5.303 ± 0.26 Schade units, antioxidant activity from 0.47 ± 0.01 to 12.8 ± 0.8 mg ascorbic acid equivalent/g dry matter, and free reducing sugar content from 60.55 ± 4.6 to 67 ± 1.5 g/100g.

This study was conducted to examine the influence of heat pretreatment and ascorbic acid application on the color and polyphenol oxidase enzyme activity of Changai jackfruit (Artocarpus heterophyllus L.) rags cultivated in Can Tho, with a focus on their effects. In particular, the effect of heat pre-treatment on polyphenol oxidase activity was evaluated using kinetic analysis. The results indicated that the inactivation kinetics of polyphenol oxidase enzymes followed a first-order equation with a rate constant ranging from 0.1204 to 2.9405 min-1. With blanching temperatures of 90°C and 100°C, the half-lives are 0.87 and 0.24 minutes, respectively, with an activation energy of 117.00 kJ/mol. Blanching the jackfruit rags at 90°C for 2.88 minutes or 100°C for 0.78 minutes effectively achieved the desired color and inactivated polyphenol oxidase enzyme activity up to 90%. Additionally, pretreatment of jackfruit rags with 0.3% ascorbic acid partially inactivated the polyphenol oxidase enzyme (approximately 45%) and improved color.

This study was conducted to evaluate the thermal impact (blanching) on the quality of mango puree during frozen storage (-20 ± 2oC). The research content was developed based on factors such as the size of mango pieces, the ratio of mango pieces, blanching water (NL:NC), blanching temperature and time. The quality parameters were browning enzyme activity, carotenoid content, vitamin C, total polyphenol content, and antioxidant activity by free radical scavenging (DPPH). The results showed that mango pieces of 7x2x1 and 10x2x1 cm blanched with the NL:NC ratio of 1:30 (w/v) under boiling water (100oC) for 120 seconds were suitable conditions for pre-treatment processing. The vitamin C content decreased from 26,40 to 19,65 mg%, while the carotenoid content decreased insignificantly. During frozen storage, bioactive compounds declined except for total polyphenol content. Moreover, the size of the mango pieces affected nutritional compounds during blanching and puree storage.

The study was conducted to identify the causal agent of soft rot disease in Chinese cabbage and the efficacy of Bacillus genus in controlling the disease. Seven strains of the Pectobacterium genus gave the symptom of soft rot belonging to Koch’s postulate and biochemical method. In which, the bacteria with the code of AG7 gave the best pathogenicity and identified the species of Pectobacterium carotovorum by 16SrRNA gen sequencing compared to National Center for Biotechnology Information combined with tested the ability growth on the Tween 80. Evaluation of the efficacy of three Bacillus spp. strains in controlling the soft rot on Chinese cabbage with three applications (before infection, after infection, combined before and after infection) in vitro. The result showed that Bacillus 41 gave lower in the infected lesion length than the control untreated. Furthermore, the timing application of Bacillus 41 before infection or combined before and after infection expressed lower in the infected lesion length than after infection method.

Nowadays, land use planning and sustainable development have become common issues in many nations. The use of AHP (Analytic hierarchy process) method to analyze and select agricultural land areas suitable for crops is applied in many research projects. This study, using the integration of AHP and GIS, correctly identifies potential areas for sustainable accumulation and concentration of agricultural land for growing vegetables. At the same time, propose a methodology on GIS application to determine suitable areas for accumulation and concentration of agricultural land to expand land use scale, meeting the adaptation needs of economic, social and environmental-ecological aspects in Moc Chau district, Son La province. The results showed that the proposed reasonable value area about 90,562 ha of medium suitability and 1,109 ha of high suitability in the planning area for accumulation and concentration of agricultural land for growing vegetables in Moc Chau district, Son La province.

Damping off disease caused by Rhizoctonia solani on many crops is affecting productivity. The results showed that three bacterial strains of Bacillus 44, Bacillus 49 and Bacillus 52 of 104 isolated bacteria. Three bacteria of Bacillus 44 and Bacillus 49 Bacillus 52 gave the inhibition efficacy was 50.00%, 49.17% and 50.58% at 48 hours, respectively. Investigating the effectiveness of controlling damping off disease on corn caused by Rhizoctonia solani Kuhn by three strains of Bacillus spp. The results showed that the treatment of Bacillus 49 and mixture of three three bacterial strain (Bacillus 44, Bacillus 49 and Bacillus 52) by soil drenching at sowing and 7 days after sowing gave a lower disease incidence of damping off  and significantly different to the untreated control at 5 days and 7 days after sowing.

Serum sample of 257 dogs were test using a microscopic agglutination test (MAT) with a standard antigen set of 24 serovars. The prevalence of Leptospira in dogs was 9.34%. The study identified 7 Lepstopira serovars, of which the common serovars were L. interrogans serovar Bataviae (46.67%). At a titer of 1/400, dogs were infected with 4 out of 24 Leptospira serovars, with infection rates ranging from 28.57% to 100%. At titers of 1/800 and 1/1600, dogs were infected with only 1 out of 24 Leptospira serovars (bataviae serovar), with the lowest infection rate of 7.14%. Blood physiological indexes showed that red blood cells (5.38 1012/L) and hematocrit (33.64 %) were lower than those of normal; white blood cells and lymphocytes following 15.23 x 109/L and 23.10% higher than normal ranges. The average blood biochemical indexes were higher than those of normal, AST was 74.48 U/L, ALT was 91.48 U/L, protein total was 7.85 g/dl, albumin was 3.94 g/dl, B.U.N was 32.13 mg/dL and ALP was 216,09 U/L. The prevalence of Leptospira in dogs raises the risk of transmission to humans.

This study evaluated the effectiveness of using Vessel Monitoring Systems (VMS) Vifish.18 on Khanh Hoa province’s fishing vessels. The study carried out from November 2023 to April 2024, the study surveyed 84 fishers who were owners and captains of Khanh Hoa fishing vessels equipping VMS Vifish.18. The study’s findings show that 81.1% of 650 vessels were installed with Vifish.18; 54% fishers stated that Vifish.18 was used very effective. Fisher's assessment of the functions related to reporting fishing vessel location, tracking journeys, and sending SOS alerts of Vifish.18 was also highly effective, accounting for the highest percentages of 71.4%, 81%, and 71.4%, respectively. On the other hand, 32% of surveyed fishers rated the operating costs as high and very high, and 15% of participants reported that the repair and troubleshooting services of Vifish.18 were slow to very slow. The study has provided significant scientific data to help manage, inspect and monitor Khanh Hoa fishing vessels operating at sea effectively, supporting the removal of the European Commission's Yellow card in the coming time.

This article presents the results of a survey of students in the field of education on the role of political subjects in identifying the peaceful evolution plots of hostile forces in cyberspace. The survey results with the participation of 345 education students in the School of Education showed that students highly appreciated the role of these subjects in helping students gain specific knowledge and understanding to identify the plots and tricks of hostile forces while also reflecting some difficulties in studying these subjects. From the results of this survey, a few solutions for teaching political subjects were proposed in this study. It contributes to raising students' awareness of the plots and tricks of hostile forces.

Based on the embodiment theory of Cognitive Linguistics, this paper explores the conceptual domain of temperature in Vietnamese. Using analytical and descriptive methods, the results showed that temperature (along with some familiar concepts such as hot, warm, cool, and cold) is a dynamic conceptual domain that exists deeply in the minds of Vietnamese people. Vietnamese people visualize temperature as a scale of human emotions, relationships, personality, etc. Conceptual metaphor models such as EMOTION IS TEMPERATURE/HEAT, NEGATIVE EMOTIONS ARE HOT/COLD, POSITIVE EMOTIONS ARE WARM/COOL, FUN/PROUD IS COOL, AFFECTION IS WARMTH, etc., are established in the paper as both universal and ethnically specific. They all have a direct basis from the experience of embodiment with 3 specific types: (i) embodiment with the body, (ii) embodiment with nature, and (iii) embodiment with culture – society.