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Abstract In this paper, we study the formation of optical bistability (OB) and optical multistability (OM) in a degenerate four-level atomic system by an external magnetic field that is excited by a probe laser field, a coupling laser field and a signal laser field. The coupling field can cause electromagnetically induced transparency (EIT) for the probe field in the atomic medium, while the signal field and/or external magnetic field can switch between single-EIT and two-EIT regimes. Based on these properties, OB and OM effects can be formed at two different frequency regions of the probe field (two channels). By adjusting the magnetic field or the intensity and the frequency of laser fields, the threshold intensity and the width of OB or OM can also be changed simply. The model can be useful for experimental observations and applications in modern photonic devices.

Abstract Background Helicobacter pylori eradication therapy based on antimicrobial susceptibility in Vietnamese children currently get low efficiency. There are causes of treatment failure, among host genetic factors namely MDR1 C3435T and CYP2C19 affect the absorption and metabolism of proton pump inhibitors - a crucial component of eradication therapy. The study aimed to investigate the effect of MDR1 C3435T and CYP2C19 genetic polymorphisms on the cure rate. Methods 207 pediatric patients with gastritis and peptic ulcer infecting Helicobacter pylori completed the eradication therapy based on antimicrobial susceptibility with proton pump inhibitor esomeprazole. Eradication efficacy was assessed after at least 4 weeks by the urease breath test. MDR1 C3435T genetic polymorphism and CYP2C19 genotype were determined using a sequencing method based on Sanger’s principle. Results Among 207 children recruited in this study, the ratio of CYP2C19 EM, IM, and PM phenotypes was 40.1%, 46.4%, and 16.9%, respectively. The patient with MDR1 3435 C/C polymorphism accounted for 43.0%, MDR1 3435 C/T was 40.1%, and MDR1 3435T/T was 16.9%. The cure rate of Helicobacter pylori infection in patients with CYP2C19 EM genotype was 78.3%; 83.3% of those with the IM genotype, and PM genotype was 96,4% (p = 0.07). Successful eradication rates for Helicobacter pylori were 85.4%, 86.7%, and 68.6% in patients with the MDR1 3435 C/C, C/T, and T/T, respectively (p = 0.02). Multiple logistic regression analysis found that MDR1 C3435T genetic polymorphisms of patients were significant independent risk factors for treatment failure, and CYP2C19 genotype did not affect Helicobacter pylori eradication. Conclusions The Helicobacter pylori eradication rates by regimens based on antibiotic susceptibility and esomeprazole were not significantly different between the CYP2C19 phenotypes. The MDR1 C3435T polymorphism is one of the factors impacting Helicobacter pylori eradication results in children.

The aim of this study was to investigate the factors influencing Body Fat Percentage (BFP) among Vietnamese adolescents aged 11 to 15 employing machine learning techniques for predictive analysis. A total of 1,208 adolescents, comprising 598 boys and 610 girls, drawn from nine junior high schools in Vietnam's capital, were enrolled in the study. Body composition measurements were conducted using the HBF 375 (Omron) device by Bioelectrical Impedance Analysis method. The study questionnaire, initially validated by The National Institute of Nutrition, encompassed inquiries related to dietary behaviors, meal frequencies, physical activities, sedentary habits, and nutritional knowledge. A machine learning methodology employing a decision tree algorithm was employed to discern the primary determinants most significantly correlated with BFP. This study successfully identified six distinct predictor groups associated with BFP among adolescents, leveraging the decision tree model, with Root Mean Squared Error (RMSE) and Mean Absolute Error (MAE) values of 4.80 and 3.80, respectively. Among these predictors, frequency of fruit consumption, snacking habits, mode of transportation to school, and screen time (computer and/or cell phone usage) emerged as the most influential factors linked to BFP in adolescents. The combination of these factors and interactions with gender and pubertal status can BFP in Vietnamese adolescents. This research sheds light on the complex and diverse factors impacting BFP in Vietnamese adolescents. This study's results underscore the practical importance of promoting healthy eating and exercise habits among adolescents, offering valuable insights for parents and schools to enhance their childcare strategies.

Drying fruit puree by the foam drying method has become popular due to its simplicity, low cost, short drying time, and low thermal degradation. The objective of the study was to investigate the effect of foaming conditions on foam properties (foam expansion, foam density) and content of β-carotene in lucuma powder using Box-Behnken design (BBD) with 3 factors and 3 levels, including water:lucuma ratio (1:1–3:1), egg albumin concentration (EA, 5–15 %), and xanthan gum (XG, 0.1–0.3 %). Response surface methodology (RSM) and artificial neural network (ANN) were used for model establishment. The results showed that as the EA increased, the foam volume increased significantly, while the foam density decreased. The ANN-coupled BBD model structure of 3–10-3 demonstrated a high level of accuracy in predicting the impact of foaming formulation on responses, with a coefficient of determination exceeding 0.99. The optimal conditions by stimulation multiple-objective RSM for lucuma foam-mat drying were achieved with a water:lucuma ratio, EA, and XG of 2.53:1, 10.8 %, and 0.22 %, respectively. Based on these ideal conditions, the foam density, foam expansion, and β-carotene content of the dried powder were found to be 0.23 ± 0.04 g/mL, 228 ± 2 %, and 237.1 ± 0.1 μg/g, respectively. The obtained experimental values were very close to the model-predicted results, with very low differences identified when the validation was performed. These findings provide information for controlling the drying process using an artificial model and further applying lucuma powder in various fields in the food industry.

AbstractUsing the GJR-GARCH method, this study examines the safe-haven role of gold, US dollar, and Bitcoin over a period including the global financial crisis, the COVID-19 pandemic and the Russia-Ukraine conflict from 3 April 2006 to 19 May 2023. The study supports the hypothesis that the safe-haven role of assets changes over periods of crisis. Specifically, gold loses its role as a safe-haven asset during the COVID-19 pandemic, but this role has been restored in the Dutch, US and German markets during the Russia-Ukraine conflict. Similarly, Bitcoin is not a safe-haven asset during the COVID-19 pandemic but is a strong safe-haven asset for the stock markets of some European countries, and a weak safe-haven asset for China when the Russia-Ukraine conflict occurred. Only the USD acts as a stable safe-haven asset through periods of crisis. However, this role is weakened in Russia. These results partly help investors and portfolio managers choose a safe haven for their assets, especially during volatile market periods.

Objective: Obesity is a complex disease that involves interactions between environmental and genetic factors in its pathogenesis. The aims of this present study were to analyse the overall effects of some nutritional, physical and genetic factors with childhood obesity, and to build predictive models of childhood obesity. Material and Methods: A case-control study was conducted on 559 Hanoi primary school children (278 obese cases and 281 normal controls). Genetic analysis was performed to evaluate genotype on the rs6265 gene BDNF, rs6548238 gene TMEM18, rs6499640 gene FTO, and rs17782313 gene MC4R. Univariate and multivariate regression analysis were conducted to compare the two groups of children, so as to draw conclusions regarding influencing factors and to establish predictive models of obesity for Hanoi primary school children. Results: Factors increasing the risk of obesity found included: urban living areas (odds ratio (OR)=1.5), caesarean section (OR=2.1), high birth weight (OR=1.9-3.1), parental overweight and obesity (OR=2.1-5.1), short night sleeping times (OR=2.6), characteristics of child feeding; including early weaning (OR=2.1), gluttony (OR=19.1), no snacking (OR=2.4), controlled eating (OR=2.4) fat food hobbies (OR=2.7), and CC rs6548238-TMEM18 genotype (OR=1.8). A predictive model of childhood obesity for Hanoi primary school children was built, based on the BMI of parents, gluttonous characteristics, unrestricted eating with ROC=0.871. Conclusion: Childhood obesity develops as a result of interaction between eating habits, lifestyle characteristics of the child and genetic characteristics inherited from over nutritious parents. Encouraging parents to manage both their own weight and their children’s eating habits such as allowing children to consume food without undue restriction and reducing gluttony can serve as effective interventions to diminish the prevalence of childhood obesity within the community.

Vietnam is a rapidly developing country associated with changes in socio-economic activities, especially both public and private services. The service industry is making a practical contribution to economic growth and is gaining a great position. To help a society develop harmoniously, the economy must satisfy people's ability to access services, especially basic services such as education, healthcare, legality, transportation, security and safety. The aims of the study are to estimate factors affecting legal service quality, and based on the survey in three provinces in Vietnam: Lam Dong, Dak Lak, Gia Lai and through quantitative analysis, the research results show that there are five factors that positively affect service quality, which are: (1) government; (2) head of the unit; ⁠(3) influencer; (4) opinions of people around; and (5) organizations and individuals providing services. The research results also discuss some solutions to increase service quality and sustainable development of Vietnam in the coming time.

Background: Hypertrophic cardiomyopathy (HCM) is a primary cardiac disorder characterized by myocardial hypertrophy without increased afterload. This study set out to describe the cardiac magnetic resonance (CMR) imaging characteristics of HCM and to evaluate correlations of selected CMR parameters with echocardiography. Methods: This cross-sectional study enrolled 46 patients diagnosed at the Vietnam Heart Institute with HCM and underwent CMR at the Radiology Center, Bach Mai Hospital, from July 2021 to September 2022. Results: A left ventricular outflow tract (LVOT)/aortic valve (AO) diameter ratio of ≥0.38 on CMR was consistent with an LVOT pressure gradient (PG) of

This cross-sectional study aimed to evaluate the nutritional status of 24–60-month-old children in Hanoi, Vietnam, and explore parents’ perception of their child's body shape, as well as related factors. The study found that parents’ wishes had a significant impact on their children’s nutritional status, as reflected in the high percentage of parents dissatisfied with their child’s weight and shape. Malnutrition, overweight, and obesity were defined based on WHO 2006 standards, and children's anthropometric indices were measured. A self-reported questionnaire was used to collect information on parents’ perception of their child’s health based on body shape and their satisfaction with it. The results showed highest dissatisfaction with the child's shape in malnourished children (86.8 %), then in the obese group (60.4 %), and lowest in overweight children (28 %). Correct parental perception about the child’s nutritional status and the healthiest shape was only 61.1 % and 34.5 %, respectively. Several related factors to parental correct perception about the child’s shape was found and it was higher 22.5 % with the parent living in suburban area than those living in urban area, 20 % with the parent of girls than those of boys, it decreased to 54 % in group of malnourished children, and 66 % in group of obese and overweight children. The findings of this study highlight the importance of parental education on healthy child development and the need for interventions to address the high prevalence of malnutrition, overweight, and obesity in preschool children.

Small wind turbines operating in low wind speed regions have not had any significant success. In addition, small wind speed regions occupy a large area of the world, so they represent a potential area for installing small wind turbines in the future. In this paper, a method to design an efficient airfoil for small wind turbines in low wind speed conditions using XFLR5 and CFD simulations is implemented. Because the impact of the airflow on the blade surface under low Re number conditions can change suddenly for small geometries, designing the airfoil shape to optimize the aerodynamic performance is essential. The tuning of the key geometric parameters using inversion techniques for better aerodynamic performance is presented in this study. A two-dimensional model was used to consider the airflow on the airfoil surface with differences in the angle of attack. The original S1010 airfoil was used to design a new airfoil for increasing the aerodynamic efficiency by using V6.57 XFLR5 software. Subsequently, the new VAST-EPU-S1010 airfoil model was adjusted to the maximum thickness and the maximum thickness position. It was simulated in low wind speed conditions of 4–6 m/s by a computational fluid dynamics simulation. The lift coefficient, drag coefficient, and CL/CD coefficient ratio were evaluated under the effect of the angle of attack and the maximum thickness by using the k-ε model. The simulation results show that the VAST-EPU-S1010 airfoil achieved the greatest aerodynamic efficiency at an angle of attack of 3°, a maximum thickness of 8%, and a maximum thickness position of 20.32%. The maximum value of CL/CD of the new airfoil at 6 m/s was higher than at 4 m/s by about 6.25%.

This article presents a research approach to enhancing the quality of short-term power output forecasting models for photovoltaic plants using a Long Short-Term Memory (LSTM) recurrent neural network. Typically, time-related indicators are used as inputs for forecasting models of PV generators. However, this study proposes replacing the time-related inputs with clear sky solar irradiance at the specific location of the power plant. This feature represents the maximum potential solar radiation that can be received at that particular location on Earth. The Ineichen/Perez model is then employed to calculate the solar irradiance. To evaluate the effectiveness of this approach, the forecasting model incorporating this new input was trained and the results were compared with those obtained from previously published models. The results show a reduction in the Mean Absolute Percentage Error (MAPE) from 3.491% to 2.766%, indicating a 24% improvement. Additionally, the Root Mean Square Error (RMSE) decreased by approximately 0.991 MW, resulting in a 45% improvement. These results demonstrate that this approach is an effective solution for enhancing the accuracy of solar power output forecasting while reducing the number of input variables.

Peer observation is considered as a useful tool to enhance teachers’ professional development. Limited research on how peer observation is carried out in Vietnamese higher institutions and how teachers experience peer observation in their educational contexts. This study investigates the experiences of peer observation among Vietnamese teachers of English and their perceptions of the benefits and challenges of peer observation. The study employed a quantitative research method to collect data. Survey questionnaires were completed online via Google Forms by 22 teachers of English working in different universities and colleges in Ho Chi Minh City. The findings show that teachers’ perceptions and experiences of peer observation varied among academic institutions. The purposes of peer observation were different among different educational settings. Peer observation sessions tend to focus more on evaluation purposes than on professional development purposes which aim to improve the teaching performance of EFL teachers. Also, the procedures for implementing peer observation were not unanimous among academic institutions. The findings have several implications for stakeholders to reflect on the current practices of peer observation in their respective institutions with a view to improving the quality of this professional development tool to enhance English language teachers’ professional development.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Despite the substantial role that chickens have played in human societies across the world, both the geographic and temporal origins of their domestication remain controversial. To address this issue, we analyzed 863 genomes from a worldwide sampling of chickens and representatives of all four species of wild jungle fowl and each of the five subspecies of red jungle fowl (RJF). Our study suggests that domestic chickens were initially derived from the RJF subspecies Gallus gallus spadiceus whose present-day distribution is predominantly in southwestern China, northern Thailand and Myanmar. Following their domestication, chickens were translocated across Southeast and South Asia where they interbred locally with both RJF subspecies and other jungle fowl species. In addition, our results show that the White Leghorn chicken breed possesses a mosaic of divergent ancestries inherited from other subspecies of RJF. Despite the strong episodic gene flow from geographically divergent lineages of jungle fowls, our analyses show that domestic chickens undergo genetic adaptations that underlie their unique behavioral, morphological and reproductive traits. Our study provides novel insights into the evolutionary history of domestic chickens and a valuable resource to facilitate ongoing genetic and functional investigations of the world's most numerous domestic animal.

Local groundwater recharge was determined using the Water Table Fluctuation method in the Long Xuyen Quadrangle and the Ca Mau Peninsula to refine existing estimates in a range of aquifer lithologies in light of climate change. The approach takes advantage of long term monthly water level records of Vietnam by Division of Water Resources Planning and Investigation for the South of Vietnam. An analysis of water levels in eight observation wells during four climatically distinct years (2005, 2009, 2013, and 2020) was used in combination with the monthly meteorological data. Groundwater recharge was estimated by the Water Table Fluctuation method to vary from 95.7 to 150.4 mm/year and account for 5.3 to 7.5% of the total rainfall. The estimates fall within the range of values used in regional-scale recharge models and demonstrate the potential of the Water Table Fluctuation method for resolving spatial and temporal variations of groundwater recharge.

This article studies the linkage between financial inclusion, monetary policy and financial stability in 58 countries including 31 high financial development countries (HFDCs) and 27 low financial development countries (LFDCs) from 2004 to 2020 using the PVAR method. Results of impulse – response function suggest that in LFDCs, while financial inclusion and financial stability are positively correlated, they are negatively correlated with the inflation rate and the money supply growth rate. In HFDCs, financial inclusion is positively corelated with inflation rate and money supply growth rate, while financial stability is negatively correlated with financial inclusion, inflation rate and money supply growth rate. These findings imply that in LFDCs, financial inclusion increases financial stability and reduces inflation. In HFDCs, on the contrary, financial inclusion increases financial instability, leading to long-term inflation. The results of the variance decomposition confirm the above outcomes, specifically, this relationship is clearer in HFDCs. From the above findings, we propose some policy recommendations on financial inclusion and monetary policy for financial stability for each group of countries.

The desired performance of nucleic acid testing (NAT) may vary if used for disease diagnosis or for the evaluation of the therapeutic efficacy of a treatment, although in most cases, the same assay is used. However, these tests may not be affordable in many situations including in low/middle income countries that in response have developed domestic assays. Given the example of HCV NAT among people who inject drugs in Vietnam, we aimed at evaluating a domestic assay versus an FDA- and CE-approved assay. This cross-evaluation revealed that (i) the domestic assay had a poorer sensitivity with a threshold of detection above 104 IU/mL, and (ii) the FDA-approved assay had a percentage of false negative results close to 1%. Together, in the present study, the domestic assay had a performance compatible with diagnosis purposes (given that this population was 70% HCV seropositive) but not compatible with HCV treatment monitoring (given that treatment failures are rare and the observed viremia frequently below the threshold of detection). This study highlights the need for a proper evaluation of HCV RNA domestic assays in order to efficiently contribute to the WHO HCV elimination target by 2030.

Poly(amidoamine) (PAMAM) dendrimers have attracted considerable attention in the field of gene therapy due to their flexibility in introducing different functional moieties and reduced toxicity at low generations. However, their transfection efficiency remains a limitation. Therefore, an essential approach for improving their transfection efficiency as gene carriers involves modifying the structure of PAMAM by conjugating functional groups around their surface. In this study, we successfully conjugated an RRHRH oligopeptide to the surface of PAMAM generation 2 (PAMAM G2) to create RRHRH-PAMAM G2. This construction aims to condense plasmid DNA (pDNA) and facilitate its penetration into cell membranes, leading to its promising potential for gene therapy. RRHRH-PAMAM G2/pDNA complexes were smaller than 100 nm and positively charged. Nano-polyplexes can enter the cell and show a high transfection efficiency after 24 h of transfection. The RRHRH-PAMAM G2 was non-toxic to HeLa, NIH3T3, A549, and MDA-MB-231 cell lines. These results strongly suggest that RRHRH-PAMAM G2 holds promise as a gene carrier for gene therapy owing to its biocompatibility and ability to deliver genes to the cell.

This paper aims to find out the current state of the high-class apartment market. Qualitative research is done to adjust and supplement the observed variables for the scale. Quantitative research is conducted through a survey of customers who have bought a high-class apartment or are intending to buy an apartment to build a research model and test the scale. After collecting data, the study conducted the descriptive statistical analysis, testing the reliability of scale. Then, the Exploratory Factor Analysis (EFA) was performed to group the related factors into groups of factors that are independent. The research results showed that there are eight main groups of factors with 31 related observational variables that affected customers' decisions to choose high-class apartments.

This study contributes to anti-malarial research effort by conducting in silico assessment of 125 compounds originated from Cannabis sativa L. against plasmodium falciparum dihydrofolate reductase-thymidinesynthase (pfDHFR-TS) enzyme for potential inhibition activity. Drug-like and pharmacokinetic criteria were used to assess the drug-like properties of the studied compounds. AutoDock4.2.6 and AutoDock Vina software were used to calculate the possible binding pose of the studied compounds to pfDHFR-TS enzyme. The docking procedure was validated using two known inhibitors cycloguanil and WR99210. 65 out of 125 compounds violated no more than 2 of Lipinski’s rule of five and were sorted out as favorable for drug development. Amongst these 65 compounds, pharmacokinetic properties and toxicity evaluation identified 60 compounds that meet the criteria of drug-like properties and were subjected to further docking studies. Docking outcomes identified 10 compounds including compounds 4, 9, 19, 22, 23, 25, 30, 42, 43, and 59 as potential candidates for inhibiting the function of pfDHFR-TS at the active site through hydrogen bonds with Ile14, Asp54, and Ile 164 residues. Compound 9 is considered as the top “hit” with docking energy far more exceeding those of the standard compounds. High correlation coefficient between the docking energy of AutoDock4.2.6 and AutoDock Vina was recorded with the value of R 2 = 0.74.

Abstract Background Species domestication is generally characterized by the exploitation of high-impact mutations through processes that involve complex shifting demographics of domesticated species. These include not only inbreeding and artificial selection that may lead to the emergence of evolutionary bottlenecks, but also post-divergence gene flow and introgression. Although domestication potentially affects the occurrence of both desired and undesired mutations, the way wild relatives of domesticated species evolve and how expensive the genetic cost underlying domestication is remain poorly understood. Here, we investigated the demographic history and genetic load of chicken domestication. Results We analyzed a dataset comprising over 800 whole genomes from both indigenous chickens and wild jungle fowls. We show that despite having a higher genetic diversity than their wild counterparts (average π, 0.00326 vs. 0.00316), the red jungle fowls, the present-day domestic chickens experienced a dramatic population size decline during their early domestication. Our analyses suggest that the concomitant bottleneck induced 2.95% more deleterious mutations across chicken genomes compared with red jungle fowls, supporting the “cost of domestication” hypothesis. Particularly, we find that 62.4% of deleterious SNPs in domestic chickens are maintained in heterozygous states and masked as recessive alleles, challenging the power of modern breeding programs to effectively eliminate these genetic loads. Finally, we suggest that positive selection decreases the incidence but increases the frequency of deleterious SNPs in domestic chicken genomes. Conclusion This study reveals a new landscape of demographic history and genomic changes associated with chicken domestication and provides insight into the evolutionary genomic profiles of domesticated animals managed under modern human selection.

Objectives: To identify the proportion of atopic dermatitis adult patients having anxiety and depression disorder and measure the relationship between anxiety and depression disorder and characteristics of atopic dermatitis. Materials and Methods: a cross-sectional study with convenience sampling was conducted. Diagnostic criteria for atopic dermatitis were based on modified Hanifin and Raijka criteria and the severity of anxiety - depression disorder was evaluated using HADS (Hospital Anxiety And Depression Scale). Results: 208 patients were enrolled in this study. The percentage of patients with anxiety and subthreshold anxiety were 11.1% and 34.1%, respectively. 5.3% of patients had depression and 39.4% of patients suffered from subthreshold depression. The proportion of patients with mixed anxiety-depressive disorder was 1.44%. Patients with severe atopic dermatitis were more likely to endure anxiety but not depression. Allergies or autoimmune diseases and SCORAD C were two independent risk factors of depression whereas edema and excoriation were two independent risk factors related to anxiety in atopic dermatitis patients. Conclusion: These findings suggest that atopic dermatitis is associated with anxiety and depression. Allergies, autoimmune diseases, pruritus, and insomnia had a correlation with anxiety and depression disorder.

The growing evolution of bacterial resistance to antibiotics represents a global issue that not only impacts healthcare systems but also political and economic processes. This necessitates the development of novel antibacterial agents. Antimicrobial peptides have shown promise in this regard. Thus, in this study, a new functional polymer was synthesized by joining a short oligopeptide sequence (Phe-Lys-Phe-Leu, FKFL) to the surface of a second-generation polyamidoamine (G2 PAMAM) dendrimer as an antibacterial component. This method of synthesis proved simple and resulted in a high conjugation yield of the product FKFL-G2. To determine its antibacterial potential, FKFL-G2 was subsequently analyzed via mass spectrometry, a cytotoxicity assay, bacterial growth assay, colony-forming unit assay, membrane permeabilization assay, transmission electron microscopy, and biofilm formation assay. FKFL-G2 was found to exhibit low toxicity to noncancerous NIH3T3 cells. Additionally, FKFL-G2 had an antibacterial effect on Escherichia coli and Staphylococcus aureus strains by interacting with and disrupting the bacterial cell membrane. Based on these findings, FKFL-G2 shows promise as a potential antibacterial agent.

This article presents a research approach to enhancing the quality of short-term power output forecasting models for photovoltaic plants using a Long Short-Term Memory (LSTM) recurrent neural network. Typically, time-related indicators are used as inputs for forecasting models of PV generators. However, this study proposes replacing the time-related inputs with clear sky solar irradiance at the specific location of the power plant. This feature represents the maximum potential solar radiation that can be received at that particular location on Earth. The Ineichen/Perez model is then employed to calculate the solar irradiance. To evaluate the effectiveness of this approach, the forecasting model incorporating this new input was trained and the results were compared with those obtained from previously published models. The results show a reduction in the Mean Absolute Percentage Error (MAPE) from 3.491% to 2.766%, indicating a 24% improvement. Additionally, the Root Mean Square Error (RMSE) decreased by approximately 0.991 MW, resulting in a 45% improvement. These results demonstrate that this approach is an effective solution for enhancing the accuracy of solar power output forecasting while reducing the number of input variables. [ABSTRACT FROM AUTHOR]

Small wind turbines operating in low wind speed regions have not had any significant success. In addition, small wind speed regions occupy a large area of the world, so they represent a potential area for installing small wind turbines in the future. In this paper, a method to design an efficient airfoil for small wind turbines in low wind speed conditions using XFLR5 and CFD simulations is implemented. Because the impact of the airflow on the blade surface under low Re number conditions can change suddenly for small geometries, designing the airfoil shape to optimize the aerodynamic performance is essential. The tuning of the key geometric parameters using inversion techniques for better aerodynamic performance is presented in this study. A two-dimensional model was used to consider the airflow on the airfoil surface with differences in the angle of attack. The original S1010 airfoil was used to design a new airfoil for increasing the aerodynamic efficiency by using V6.57 XFLR5 software. Subsequently, the new VAST-EPU-S1010 airfoil model was adjusted to the maximum thickness and the maximum thickness position. It was simulated in low wind speed conditions of 4–6 m/s by a computational fluid dynamics simulation. The lift coefficient, drag coefficient, and CL/CD coefficient ratio were evaluated under the effect of the angle of attack and the maximum thickness by using the k-ε model. The simulation results show that the VAST-EPU-S1010 airfoil achieved the greatest aerodynamic efficiency at an angle of attack of 3°, a maximum thickness of 8%, and a maximum thickness position of 20.32%. The maximum value of CL/CD of the new airfoil at 6 m/s was higher than at 4 m/s by about 6.25%. [ABSTRACT FROM AUTHOR]

In this study, we investigated the efficacy and suitability of five different nutrient solutions, including Biolife, BKFast, Hoagland, Hydro Umat F and Knop, on the growth and development of Impatiens walleriana in a hydroponic system. The investigated parameters were branch numbers, canopy diameter, leaf size, flower numbers, floral longevity, flower diameter and flowering time. The results showed that Knop and Hydro Umat F were the most suitable solutions for the growth of hydroponic Impatiens walleriana. The highest floral longevity (7.64 to 7.67 days) and largest flower diameter (4.68 to 4.71 cm) were obtained from Knop and Hydro Umat F solution treatment, respectively. Besides, compared to the other four solutions, using the Knop solution helped impatiens have the earliest flowers (27.14 days) and the highest number of flowers (54.86 flowers). Based on the results of our study, we recommend using the Knop nutrient solution with a TDS concentration range of 750-800 ppm and a pH level range of 5.5-6.5 for three-week-old Impatiens walleriana seedlings. [ABSTRACT FROM AUTHOR]

Along with the development of society, based on the internet platform, in addition to other types of written and visual newspapers, online newspapers were born, allowing people around the world to quickly access news without delay depends on space and time. To attract readers, the language of online newspapers is also increasingly being innovated to meet readers' tastes. Code mixing is a fairly common phenomenon in online newspapers, giving readers interesting impressions. Therefore, the article "Code mixing phenomena in Vietnam online newspapers" will survey the forms of code mixing in languages in Vietnamese online newspapers, thereby providing comprehensive assessments of this phenomenon on the Internet journalistic language in particular and communication in general. [ABSTRACT FROM AUTHOR]

Recently, there has been growing interest in incorporating dietary fiber into yogurt products, driven by its potential to improve the texture, rheology, and stability of yogurt, as well as the associated health benefits. This study specifically focused on the utilization of enzymatically hydrolyzed cantaloupe rind powder, which was the product of the enzymatic hydrolysis of the raw cantaloupe rind powder using cellulase and xylanase enzymes to increase its soluble dietary fiber content. The resulting hydrolyzed cantaloupe rind powder (referred to as HCRP) was added to a probiotic yogurt recipe at varying ratios of 0.5%, 1.0%, and 1.5% (w/w). Physicochemical, textural, and rheological properties, and syneresis of the control yogurt (without HCRP addition) and the HCRP-fortified yogurts at different addition ratios, were evaluated during a 15-day storage period at 4℃. Additionally, the color, total phenolic content (TPC), and antioxidant property of the yogurts were assessed at the end of the storage period. The results demonstrated that the addition of HCRP increased the hardness, viscosity, elasticity, and stability of the yogurt compared to the control yogurt. Specifically, the addition of 1.5% HCRP to yogurt resulted in a 1.6, 6.0, 1.9, 1.7, and 1.5 times increase in hardness, adhesiveness, apparent viscosity, storage modulus, and loss modulus compared to the control yogurt on day 15 of the storage period, respectively. Meanwhile, the syneresis was reduced by approximately 3 times in the 1.5% HCRP-added yogurt (5.60%) compared to the control yogurt (17.41%). The TPC of the yogurt also increased with higher levels of HCRP addition, reaching approximately 1.5 times that of the control yogurt at a 1.5% addition level. Furthermore, the antioxidant activity, as determined by the DPPH assay, was not detected in the control yogurt but exhibited a significant increase with higher concentrations of HCRP. This study highlights the potential of enzymatically hydrolyzed cantaloupe rind powder as a functional ingredient to enhance the quality attributes of yogurt, including its textural, rheological properties, stability, phenolic content, and antioxidant activity. [ABSTRACT FROM AUTHOR]

This study examined the impact of the use of cartoons on the speaking and listening skills of students in a primary school in a rural area in Vietnam and their attitudes towards the use of cartoons as a learning tool in their English classes. The study employed an experimental research design to collect data. Participants included 70 fifth-graders divided into two groups, the control group and the experiment group. The control group was taught regular English lessons. The experiment group learned similar lessons but cartoons were added to the English lesson to practice speaking and listening skills for six weeks. Before and after the experiment, the speaking and listening skills of the two groups were measured by a pretest and a posttest. In addition, the students in the experiment group were surveyed using a questionnaire to examine their attitudes towards watching cartoons for learning purposes. The findings show the English speaking and listening skills of the students in the experimental group improved more significantly than those of the students in the control group. Besides, the students in the experiment group expressed positive attitudes towards watching cartoons in English classes. The findings had implications for English language teachers at primary schools in Vietnam and in other non-dominant English speaking countries to include visual materials in their English lessons to enhance young learners’ English proficiency.

This study attempts to investigate the effect of the Total Physical Response (TPR) Method on vocabulary retention and explore the young learners’ attitudes toward it. It involved sixty two English young learners (YLs) aging from 10 to 11. All of them were attending English classes at Viet Uc English Language Center (henceforth called VUC) in Bien Hoa City where the current study was conducted. Both quantitative and qualitative data was obtained through the three instruments, namely pre- and post-test and interview. Descriptive statistics was employed for data analysis. The results revealed that TPR had effect on the YLs’ vocabulary knowledge through an increase in their vocabulary retention after they underwent the treatment. Similarly, the findings of the study also revealed that the YLs had positive attitudes toward the use TPR in vocabulary teaching and learning. This study is expected to shed light to the implementation of teaching vocabulary methods in the VUC context and other similar contexts.

The monosaccharide composition is one of the crucial factors affecting the bioactivity of exopolysaccharide (EPS) in Cordyceps species. Therefore, many scientists have studied, analyzed monosaccharide composition and structure of EPS from Cordyceps species, especially Ophiocordyceps sinensis (O. sinensis). This study aimed to compare hydrochloric acid (HCl) with trifluoroacetic acid (TFA) in the EPS hydrolysis process in monosaccharide composition analysis by Gas Chromatography with Flame-Ionization Detection (GC-FID). The hydrolysis is a crucial step in forming the acetyl derivative, which helps the GC-FID technique to have good results in monosaccharide composition analysis. The results showed that hydrolysis with HCl gave a higher hydrolysis efficiency and was more suitable than hydrolysis by TFA in pretreatment to EPS for GC-FID. Hydrolysis results were analyzed through thin-layer chromatography and high-performance liquid chromatography (HPLC), then Acetyl derivatives were produced and finally analyzed by GC-FID to determine the monosaccharide composition of EPS. For EPS hydrolyzed by HCl, the analytical results presented that this sample had 6 kinds of monosaccharides, including rhamnose, arabinose, xylose, mannose, glucose, and galactose; the most monosaccharide was glucose. The EPS hydrolyzed by TFA only detected three kinds of monosaccharides, including mannose, arabinose, and galactose, mainly mannose. The study has set a foundation for further analysis of monosaccharide composition and structure of EPS from O. sinensis.

Xạ đen, tên khoa học là Ehretia asperula Zoll. et Mor., thuộc họ Vòi voi (Boraginaceae), có nguồn gốc từ các nước Đông Nam Á. Xạ đen thường được dùng để chữa bệnh như u nhọt (kể cả ung bướu), viêm thũng và giải độc. Khảo sát ảnh hưởng của một số chất điều hòa sinh trưởng thực vật và nguồn cung cấp carbon lên sự hình thành và tăng sinh mô sẹo từ mẫu cấy lá của cây xạ đen in vitro nhằm tạo nguyên liệu cho các hệ thống nuôi cấy tế bào để cung cấp các hợp chất có giá trị cho ngành dược liệu. Kết quả cho thấy mô sẹo phát triển tốt trên môi trường B5 bổ sung glucose 30 mg/L và 2,4-D 0,4 mg/L kết hợp với BA 0,1 mg/L. Trên môi trường này, mô sẹo có màu vàng xanh, xốp, mịn và tăng sinh nhanh. Mô sẹo chuyển sang màu trắng sữa sau 10 tuần nuôi cấy và được sử dụng làm nguyêu liệu cho nuôi cấy huyền phù tế bào. Huyền phù tế bào trong điều kiện tối phát triển tốt hơn ngoài sáng với lượng sinh khối cao nhất đạt được sau 4 tuần nuôi cấy (149,933 g/L).

This study aims to analyze the factors affecting the role of women in the economic development of rural household families in Vietnam. 210 survey samples collected in Trieu Son district, Thanh Hoa province were used as data in the study. The study finds a number of important factors influencing the role of women in rural household economic development. Since then, some meaningful solutions to promote the role of women in the economic development of rural household families in Trieu Son district are proposed in the study.

Targeted drugs have been used to treat mitochondrial dysfunction-related diseases, including metabolic disorders and cancer; however, targeting and penetrating intracellular organelles remains a challenge. Dominant targeting approaches for therapeutic delivery are detailed in many nanoemulsion studies and show the tremendous potential of targeted delivery to inhibit cancer cell growth. Dequalinium (DQA) and α-tocopherol succinate (α-TOS) are good agents for targeting mitochondria. In this study, we aimed to develop a mitochondria-targeting emulsion, using DQA and α-TOS (DTOS), for cancer treatment. DTOS emulsions of 150–170 nm in diameter were formulated using homogenization. DQA and α-TOS were used as bifunctional agents (surfactants) to stabilize the nanoemulsion and anticancer drugs. Various molar ratios of DQA and α-TOS were tested to determine the optimal condition, and DTOS 5-5 was selected for further study. The DTOS emulsion showed improved stability, as evidenced by its ability to remain stable for three years at room temperature. This stability, combined with its effective targeting of mitochondria, led to inhibition of 71.5% of HeLa cells after 24 h. The DTOS emulsion effectively inhibited spheroid growth in the 3D model, as well as prevented the growth of HeLa cells grafted onto zebrafish larvae. These results highlight the DTOS emulsion’s promising potential for mitochondria-targeting and cancer treatment.