E-commerce has been constantly evolving and increasingly popular in Vietnam. With the significant growth of online shopping websites, evaluating and selecting the right website for smart shopping decision is always a considerable concern for consumers. This study proposes a methodology to evaluate the competitive advantages of online shopping websites in Vietnam, including A, B, C and D. In the study, the Fuzzy Analytic Hierarchy Process (AHP) method is used to build the set of criteria weights. Next, the study uses the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) approach to evaluate the ranking of websites, finding the most advantageous website, according to the distance to the ideal solutions. The results from the evaluation of 18 criteria show that B is the most appreciated among the four proposed websites, follows by A, D and C, respectively.

Nowadays, wind turbine generators are being developed and widely used in many countries around the world. However, there is not much research about wind turbine in Vietnam, specifically the direct-drive permanent magnet synchronous generator (PMSG). Therefore, this paper is to demonstrate the operation of a 2 MW direct-drive wind turbine using a permanent magnet synchronous generator to assist other researchers to gain more knowledge about this type of generator. First of all, the structure and operating principle of a PMSG wind turbine are presented. The controllers will be then designed. The simulation results based on PSIM software with different wind conditions will demonstrate the operation of the PMSG wind turbine and the performance of the designed controllers.

This paper presents a method for building a controller of a 3-axis robotic arm model from Fischertechnik. Autodesk Inventor software was used to draw the 3D model of the arm which was then converted to the model in Matlab (for controller design and simulation) via SimMechanics link toolbox. Feedback control as well as forward and inverse kinematics were applied to control positions of joints and gripper respectively. The arm has been integrated camera to perform color classification based on LabVIEW’s image processing library. A Human Machine Interface (HMI) was also designed using LabVIEW that allows operators to control and supervise the model in operation. The experimental results show that the robotic arm model can move to desired positions with low error (

Research on human survival after a plane crash shows that victims are 10% less likely to survive if the rescue is delayed by more than 2 days, and the survival rate is up to 60% if the rescue is made timely within 8 hours (Xuân Đông, 2014). The same urgency also applies to maritime emergency situations or on land. Therefore, the time to find victims and rescue organizations is a decisive factor for the success of that campaign. To reduce the search time, an increasingly commonly used approach is to detect anomalies in high-resolution remote sensing images. In addition, the size of the missing person or object of interest is very small compared to the scene and is easily mixed with the terrain. Therefore, it is necessary to have methods to automatically locate objects that help improve the performance and speed of searching. In this paper, several methods of detecting anomalies in remote sensing images will be presented to solve the problem mentioned above.

The study was carried out to evaluate the AAO treatment process to eliminate the organic matter, nitrogen and phosphorus to the optimum values, while surveying some suitable operating parameters for biogas effluent treatment to reach the permitted discharge standards. The study was conducted on the laboratory scale AAO model of 42 L. When operating the AAO unit with the inlet wastewater concentration of COD, TKN and TP were 983.53 ± 14.80 mg/L, 134.73 ± 4.20 mg/L and 39.63 ± 2.15 mg/L, the average organic loading rate of 1.12 kg BOD/m3.day-1, the outlet wastewater reaches QCVN 62-MT:2016/BTNMT and QCVN 40:2011/BTNMT (column A) with treatment efficiency of COD, TKN, TP were 90.05%, 89.12% and 93.21% respectively. At the retention time of 9 hours, the average organic loading rate of 1.25 kg BOD/m3.day-1, the concentration of BOD5 and COD from effluent only reaches column B of QCVN 62-MT:2016/BTNMT. The research results show that it needs 10 hours hydraulic retention time of AAO unit to treat effluent from biogas plant to reach the discharge standards of organic and nutrient parameters.

A total of 112 species belonging to 60 genera, 38 families and 17 orders in three classes of Porifera phylum were identified in the coastal region of the Con Co island in 2013-2014. In which, the soft sponge class Demospongiae had 109 species (accounting for 97,32% of total species) in 57 genera, 35 families, 14 orders. The class Calcarea had 2 species (accounting for 1,79%) and the class Homoscleromorpha had only 1 species (accounting for 0,89%). Sponges species were widely distributed in the range of 0-21 m from the coast, and mostly in the depth of 3-10 m. The Bray-Curtis similarity index for the distribution of sponges was divided into 7 groups with 75% of similarity among research stations. The distribution of sponges possesses a close relationship with the substrate types. The average coverage of sponges on the subtrates was about 3.13%. The rocky subtrate has the highest coverage of 51.6%. In general, the sponges covered relatively evenly on the subtrate, and this distribution of sponges did not show a close correlation with other component on the subtrates.

The paper proposes a forecasting model for time series based on improvements in determining the universe set and establishment the fuzzy relation. The proposed model is specifically illustrated the steps by the enumerical example and performed effectively by an established R procedure. It has shown more advantages than the popular models such as ARIMA and Abbasov-Manedova (2003) with a lot of the considered bench mark data. The proposed model is also applied in forecasting salty peak for a coastal province in Viet Nam. The examples and applications have shown potential in reality of the researched problem.

Hepatitis C is a major global health burden. This long-term disease often leads to chronicity and potentially to liver failure. There is no anti-HCV vaccine. It has recently been shown that natural compounds may be a source of anti-HCV drugs, but there are a few studies on lichens. In recent study, a phytochemical investigation was conducted on the lichen Parmotrema tinctorum collected in Lam Dong province; study on activity against Hepatitis C virus of isolated compounds. Column chromatography, thin layer chromatography and recrystallization were used to isolate compounds. Their structures were elucidated by ESI-HRMS and NMR spectral analysis. The anti-HCV activity of five isolated compounds was evaluated by Renilla Luciferase assay. Five compounds including (1) methyl β-orcinolcarboxylate, (2) orsellinic acid, (3) lecanorol, (4) atranorin and (5) salazinic acid were isolated from such lichen. Compound (4) showed the most effective inhibitor with IC50 22.3 µM. Our work first demonstrates a new antiviral approach of natural compounds from lichen in Vietnam.

This study was conducted to investigate the development and metamorphosis of the tadpoles of the species Limnonectes bannaensis in captivity in Nghe An. Adult individuals were captived breeding in pairs to reproduce and then the development of tadpoles was monitored. The tadpoles of species L. bannaensis in Nghe An have the identifiable characteristics: body in medium size, elliptical in dorsal view, flattened above and below, eyes in medium size, small nostrils , mouth position below or anterior below, papillea on lower lip and laterals, upper lip without papillea, LTRF I(1+1)/(1+1)II, single spiracle opening on left side, the head and body are yellow gray, tail with 4 to 5 horizontal black streaks. Tadpoles in captivity take from 70 to 72 days to complete metamorphosis, the embryo period from stage 1 to 19 has the shortest time (231 hours), the larval period from stage 26 to 40 has the longest time (527 hours).

Bacillus subtilis natto is one of bacteria generally recognized as safe and produces nattokinase, a fibrinolytic enzyme. It so could potentially be used as probiotic for prevention and treatment of cardiovascular diseases. In this study, the bacteria’s probiotic properties such as bile salt tolerance, simulated gastric fluid tolerance and fibrinolysis ability were tested. The results showed that the bacteria survival highly remained under survey conditions. After 3 hours incubating in 0.3% and 0.6% bile salt containing media, survival percentage of bacteria were 96.8% and 85.5% corresponding to 7.87±0.08 and 6.95±0.10  log CFU/mL, respectively. After exposure to pH 2 for 3 hours, survival density of bacteria was 6.73±0.04 log CFU/mL or 79.11% of initial density. After  3-hour incubation in simulated gastric conditions, pH 2.5 and 0.3% pepsin, survival density of bacteria was 6.71±0.02 log CFU/mL or 83.31% of initial density. B. subtilis showed antibacterial activity against 4 pathogenic bacteria: Escherichia coli ATCC 8739 (8,00±0,76 mm), Salmonella typhimurium ATCC 14028 (9,00±0,40 mm), Staphylococcus aureus ATCC 6538 (10,00±0,58 mm) and Pseudomonus aegurinosa ATCC 25853 (8,00±0,29 mm). Fibrinolytic activity was determined via clotted degradation; 25% clotted weight was lost after 2-hour incubation with 36-hour cultured broth. Bacillus subtilis natto là dòng vi khuẩn thuộc nhóm vi khuẩn an toàn và có khả năng tổng hợp nattokinase, một enzyme phân giải huyết khối. Chúng có tiềm năng ứng dụng làm probiotic trong phòng ngừa và hỗ trợ điều trị các bệnh liên quan đến tim mạch. Nghiên cứu này kiểm tra đặc tính probiotic như khả năng chịu muối mật, khả năng chịu đựng điều kiện dịch dạ dày nhân tạo và khả năng làm tan huyết khối của B. subtilis natto. Kết quả cho thấy chủng vi khuẩn chịu được các điều kiện khảo sát. Sau 3 giờ ủ trong môi trường chứa 0,3% và 0,6% muối mật; mật độ duy trì lần lượt là 96,8% và 85,5% so với ban đầu tương ứng với 7,87± 0,08 và 6,95± 0,10  log CFU/mL. Sau 3 giờ ủ ở môi trường pH 2, vi khuẩn có khả năng tồn tại với mật độ đạt 6,73±0,04 log CFU/mL tương ứng tỷ lệ sống là 79,11% so với ban đầu. Sau 3 giờ ủ trong môi trường dịch dạ dày nhân tạo pH 2,5 có bổ sung 0,3% enzyme pepsin, mật độ duy trì 6,71±0,02 log CFU/mL ứng với tỷ lệ 83,31% so với mật độ ban đầu. B. subtilis natto có khả năng kháng lại 4 loại vi khuẩn gây bệnh trong nghiên cứu này Escherichia coli ATCC 8739, Salmonella typhimurium ATCC 14028, Staphylococcus aureus ATCC 6538, Pseudomonus aegurinosa ATCC 25853 với vòng vô khuẩn tương ứng là 8,0; 9,0; 10,0 và 8,0 mm. Khả năng hòa tan huyết khối được khẳng định khi dịch nuôi cấy sau 36 giờ có khả năng làm tan 25% lượng huyết khối tươi sau 2 giờ ủ.

This study was conducted on 22 bacterial strains which were isolated from the rhizosphere of the black pepper plants and determinated the ability of nitrogen fixation, phosphate solubilization, IAA synthesis, and siderophore production in a previous research. The ability to degrade organic compounds including starch, protein, lipid, chitin and the fungal inhibition of these bacteria has been investigated by using agar well diffusion method. The results showed that the number of bacterial strains capable of degrading starch, protein, chitin and lipid were 21, 20, 12, and 10 respectively. Two bacterial strains including MH13 and ML17.1 were able to inhibit indicator fungi in which MH13 able to inhibit Fusarium sp. and ML17.1 able to inhibit all of the fungi including Fusarium sp., Penicillium sp., Aspergillus niger, A. flavus, and Cladosporium sp. The top 4 strains have been identified as Bacillus subtilis (ML17.1 and MH13) and Alcaligenes sp. (CT5 and TT5) by using MALDI-TOF mass spectrometry. These are plant-growth-promoting rhizobacteria that have been reported for potential applications in agriculture.

There are increasing number of cancer deaths worldwide, motivating more studies to find solutions for the prevention of cancer. Although some of cancer diseases are attributed to gene inherited from parents, most of other cancers are formed from an interaction between gene and environmental factors, including physical, chemical and biological agents. Food is accounted to 30% of risk factors that cause cancer. Food can contribute to the formation of cancer through three mechanisms: epigenetic factors, DNA damage-caused by oxidative stress and mutagenesis. In contrast, some of food containing bioactive compounds are able to prevent or minimize above cancer-induced mechanisms. This paper is to analyze molecular mechanisms of food driving cancer and summarize some food components that can support or prevent the process of cancer development. From such analysis, some notifications to maintain healthy diets and lifestyle in the prevention of cancer thread are also suggested.

This study is aimed to evaluate the influence of extraction conditions assisted by ultrasound on total flavonoid and total phenolic contents as well as antioxidant activity of extracts from garlic bulbs (Allium sativum L.) through DPPH free radical scavenging activity and total reducing power. The results showed that ultrasound-assisted extraction increased the extract efficiency, and extraction solvents, garlic bulbs-to-solvent ratio, extraction time, extraction temperature affected the total flavonoid and total phenolic contents as well as antioxidant activity of garlic extracts. The best conditions to extract antioxidants from garlic bulbs were: distilled water to garlic bulbs ratio, 10 ml/g; extraction time, 15 min; extraction temperature, 30°C and extracting twice.

The study was conducted to determine the allelopathic activities of eight rice (Oryza sativa L.) varieties OM (2395, 3536, 4498, 5451, 5930, 6976, 7347 and N406) by applying their methanol (MeOH) extracts on barnyardgrass (Echinochloa crus-galli L.) and watercress (Lepidium sativum) at  different concentration ranges (0.01, 0.03, 0.1, 0.3, 0.5 and 1.0 g/mL). The shoot and root length of barnyardgrass and watercress were recorded after 48 hours of incubation at 250C. The results showed that the extract from OM 5930 had inhibitory rates on the shoot and root length of barnyardgrass and watercress higher than that from other varieties. At 0.3 grams per milliliter, the OM 5930 extract inhibited 100% of watercress shoot and root length while the extracts of other OM rice varieties only achieved inhibition rates from 76.14% to 91.97%. For barnyardgrass, the dose of OM 5930 extract requiring for over 50% of inhibition (57.39% for shoot and 66.93% for root length) is 0.3 grams per milliliter; 98.77% for shoot and 99.39% for root length at a concentration of 1.0 grams per milliliter. This result indicated that OM 5930 rice variety may be used as a priority in rice allelopathy research program or in the program of breeding weed suppressing rice varieties to reach an environmentally friendly and sustainable agriculture.

A study on the species compositions of the benthic diatoms in the family Eunotiaceae in 5 habitats, including (1) main canals, (2) criss-crossing canals, (3) Melaleuca sp., (4) Eleocharis sp., and (5) lotus Nelumbo sp. habitats in Tram Chim National Park in the rainy and dry seasons showed that 20 species belonging to 3 genera, including Actinella, Desmogomium, and Eunotia were detected. In the rainy season, either genus Actinella or Desmogomium included 01 species, whereas Eunotia was 16 species. However, Actinella with 01 species, Desmogomium with 2 species and Eunotia with 16 species were recorded in the dry season. The genus Eunotia reached the highest density at the main canals habitat in both rainy and dry seasons. The lowest one was in Eleocharis sp. habitat in the rainy season or lotus Nelumbo sp. habitat in the dry season. For the similarity, distribution of Eunotiaceae in the park could be divided into three ecological zones in the rainy season: Eleocharis sp. habitat - criss-crossing canal/lotus Nelumbo sp. - Melaleuca sp./main canal habitats; and two zones in the dry season: main canals and criss-crossing canal/lotus Nelumbo sp./Eleocharis sp./Melaleuca sp. habitats.

The purpose of this study was to examine the effect of different dietary of protein levels on water quality, growth performance of Asian swamp eels Monopterus albus (Zwiew, 1793) and productivity of pak choi (Brassica chinensis) in aquaponic systems. Swamp eels (47.4 g/con) were fed with 4 different dietary protein levels of 25% (NT1), 30% (NT2), 35% (NT3) and 40% (NT 4). The experimental swamp eels were hold in aquaponic recirculting system with pak choi (100 head/m2). The experiment was run for 60 days with two cycles of pak choi. The result showed that higher protein level of feed would induce higher concentration of nitrogen in the form of total ammonia and nitrate. There was a significant difference (P

The study was conducted to investigate the variation of density and composition of bacteria in mud in My Thanh river including the upper part (Nhu Gia), middle part (My Thanh 1), and lower part (My Thanh 2). Mud samples were collected once a month from July 2017 to June 2018 at low tide. Bacteria density was determined by plate counting. The results indicated that the total bacterial population was at its peak in Nhu Gia (5,3×104 CFU/g), and at the lowest in My Thanh 2 (5,3×104 CFU/g), and it tended to decrease from January to June. Bacillus and Lactobacillus density was high in Nhu Gia and low in My Thanh 2. Bacillus density was stable throughout the months of the year at all 3 sampling sites, but the density decreased when salinity increased. In My Thanh 2, Bacillus density was proved significantly lower than in Nhu Gia; specifically, in May (8.3 × 103 CFU/g) in My Thanh 2 versus (1,9 × 106 CFU/g) in Nhu Gia. Lactobacillus had the lowest density (3.4 × 102 CFU/g) in June and the highest (2.7 × 105 CFU/mL) in February. Besides, the total Vibrio density tended to increase with the rise of salinity during the year and exceeded 103CFU/g in My Thanh 2. The density of V. harveyi, V. parahaemolyticus in My Thanh 2 and My Thanh 1 was higher than Nhu Gia’s. The higher the salinity, the greater the concentration of Vibrio, V. harvey and V. parahaemolyticus and it may lead to risk for animals.

A study on reproductive biology of Indian mackerel was conducted from January to December, 2018 in the coastal areas from Tien Giang to Soc Trang provinces. The analysis of 253 male and 225 female samples showed that the total length (L) and body weight (W) of the fish had a regression relationship according to the equations Wmale = 0.0067L3.161 and R2 = 0.9291 (weight body ranged 71.48-186.65 g/individual) and Wfemale = 0.0059L3.2112 and R2 = 0.9276 (body weight ranged from 80.47-201.97 g/individual). The natural spawning season of Indian mackerel in the study area is all year round but concentrates from March to June and from September to November.  The absolute fecundity of Indian mackerel ranged from 14,082 to 137,308 eggs/individual and the relative fecundity 393±92 eggs/g of female, in which the body weight of female fish ranged from 80.47 to 201.97 g/individual. A very tight regression relationship was found between absolute fecundity and body weight according to the equation F=0.4654W2.374 (R²=0.9319).

The study was conducted to assess the current status of the information technology application in teaching activities of primary teachers, analyze the factors affecting the effectiveness of the application, and propose solutions to improve the application efficiency at some primary schools in  Can Tho City. The method of sociological research through interviewing by the questionnaire and the scoring method was used. Primary data were collected by a non-probability sampling method for selecting teachers and random method for choosing participating schools in the study. The binary regression model was selected to determine the impact factors based on data resources from 60 teachers of 12 elementary schools in Ninh Kieu, Cai Rang, and Phong Dien districts. The results showed that the effectiveness of the binary regression model depends on two factors including advanced software using skills and teachers' attitudes about information technology application in teaching activities. Regarding evaluation of teachers, nine solutions had been suggested. In particular, the two solutions with the highest average score included teachers should equip a personal computer for themselves and the school directorates should equip the audiovisual systems for each classroom.

Over the last ten years, teaching and learning the three different components of Marxism-Leninism, namely Philosophy, Political Economy and Scientific Socialism has experienced a significant change. This mainly relates to the fact that these integral parts were combined and renamed as a new subject ‘The Basic Principles of Marxism-Leninism’. This combination causes three issues: (1) trivialisation of the science; (2) lack of in-depth academic research; and (3) deskillingand unsustained teaching career in Marxism - Leninism.  As a result, the outcomes of the integrated subject have been unlikely achieved owing to the majority of instructors’ absence of self-confidence in teaching and relaxing evaluative criteria of students’ learning outcomes. Additionally, learners have gained less incentive in studying, attended the classes less frequently and devalued political sciences. Several solutions were proposed to improve the quality of learning the subject in the context of Can Tho University.

The ordination is the form of unique text, the most precious resources which are valid in many ways. To day, Dong Thap province luckily has preserved a large number of the ordination which was issued in Hau Le dynasty and Nguyen dynasty. Through investigations, the ordinations were issued for the gods and the characters who eserved well of our country. This article introduces the basic imformation of characters were issued the ordinations and the beliefs of Dong Thap people in particular and Westerners in general under the present scarce documentation circumstances. That show the direct effects of ordination on the cultural and spiritual life also the worship activities of the locals at the present.

The purpose of the study analyzed the factors affected workplace commitment at the joint stock commercial banks in Long Xuyen city. The study was conducted on 300 staffs working at banks by convenient sampling method. In this study, Cronbach's alpha, EFA, CFA and structural equation modeling (SEM) combined with ANOVA analysis are used to identify factors that affect workplace commitment with the bank. The results showed that the commitment of employees is influenced by factors such as salary, leadership style, training and development policy. Among them, salary is the most important factor in employee commitment. Based on those findings, the author would have some proposals on skilled human resource development and methods to maintain the employee commitment to the banks in Long Xuyên City.

The paper is aimed to (i) identify and assess determinants of the status-quo of supporting industry, and (ii) assess the potential factors that would leverage the supporting industry at Can Tho City so that policy recommendations for developing this sector were proposed. Qualitative analysis approach was used to assess the status-quo of the development of supporting industries at Can Tho City. Findings from 326 enterprises surveyed in 12 main industries on demand and provision capacity of supporting products showed that Can Tho City’s supporting industries was not developed well. The advantages and disadvantages in developing supporting industries in Can Tho City were presented based on Michael Porter’s diamond model including factor conditions, demand conditions, related industries, and business environment. Some policy recommendations and solutions were proposed to develop the supporting industries in Can Tho city.