In this study, spherical Ag nanoparticles (Ag NPs) with sizes of 8 – 12 nm as an antibacterial additive for indoor waterborne architectural coating have been successfully synthesized by chemical reduction method. This simple and environmentally friendly process is performed with a reducing agent and a protective agent that is glucose (concentration of 0.4%) and hydroxypropyl methylcellulose (HPMC_concentration of 0.01%), respectively. Next, nano silver solution was added to the paint before adding the emulsion resin. This method maintains the chemical and physical properties of the paint while enhancing the antimicrobial ability from nano silver in the paint. The effectiveness of nano silver as an antibacterial additive for emulsion paints was evaluated on Escherichia coli and Bacillus subtilis using an antibacterial ring method, respectively. The results showed that the emulsion paint was bactericidal with the nano silver content of 0.1 – 0.5 ppm in the paint. The antimicrobial effect of nano silver in the emulsion paint was maintained for a minimum period of 30 days. 

The study was conducted to graft collagen extracted from catfish skin (Pangasiidae) onto surface of hydroxyapatite (HA) synthesized from catfish bone in order to increase its applications in biomedical field. After extracting from catfish skin, collagen was grafted onto the HA surface by using glutaraldehyde as a bridge. HA particles were firstly grafted to 3 - amino propyl triethoxysilane (APTES) to form amine functional groups on the surface. Glutaraldehyde was then used as bonding bridge to graft HA and collagen through the reaction between amine and aldehyde. Factors affecting the grafting efficiency such as collagen concentration, time and temperature of the reaction were investigated. Experimental results showed that solution of 1 mg/mL collagen,  reaction time of 3 hours and reaction temperature of 37°C are suitable conditions for grafting collagen onto surface of HA. In addition, the SEM images showed that size of HA particles was approximately 1,000 nm and covered by a layer of collagen after grafting.

The study was conducted to determine the factors that affect land use planning in Can Tho city based on the application of exploratory factor analysis model and multivariate linear regression model. The survey was conducted with 100 land users in Can Tho city. The result indicated that 55.1% of the variation of residential land use planning could be explained by the variation of the 5 groups of independent variables. The obtained results showed that five groups of factors affecting the land use planing in Can Tho city by land user perspective with the statistical significance of 1% (ranked from strong to weak) include group of economic factors, group of environmental factors, group of other factors, group of social factors, group of institutional and legal factors.

This study was implemented to assess the current status of generation, collection, recycling and management of household electronic waste (e-waste) in several wards in Can Tho city including An Hoa (Ninh Kieu district), Ba Lang (Cai Rang district), Long Tuyen (Binh Thuy district), and Tan Loc (Thot Not district). The household survey method was applied by randomly interviewing 120 households and 16 e-waste collection and treatment facilities in the area in August 2020. The results of the current status of using household electronic devices based on the number of devices used per household were arranged in the following order: mobile phone and electric fan > television > refrigerator > air conditioner > washing machine > computer with the average mean rates of 3.58, 1.48, 1.01, 0.78, 0.72, and 0.50 pcs/household, respectively. The average life expectancy of the devices was relatively high, ranging from 6 to 12 years (except for mobile phones). According to the estimated results, telephones and electric fans are the two devices used and may have the highest rate of waste generation in the city. Safe collection, treatment and disposal programs have not been implemented in the study area, but mainly selling scrap and repairing. The survey results also showed that there was a limitation in awareness of respondents about the impacts of e-waste. Therefore, further studies on the causes of these limitations are needed in the future.

Measurements of radio emission from extensive air showers during thunderstorm conditions are presents in this paper. Both intensity and polarization footprints of these events are very different from those measured during fair weather. A fitting procedure and analyzed eleven air showers have been carried out. In order to reconstruct these showers, atmospheric electric fields in thunderclouds generally are composed of at least three layers. It was found that the electric fields extracted from these events have some similar characteristics. Large horizontal components of the electric fields are observed in the middle and the top layers. The height of the bottom layer depends on the season.

In exploration geophysics, solving the problem of inverse potential plays an important role, contributing to quantitative interpretation of the characteristic parameters of the field source causing the observed anomaly and this is often quite difficult. One of the difficulties is that its mathematical solution is not unique, because there is always more than one model to simulate the observed data with an error within the allowable range. In this paper, the continuous wavelet transform (CWT), using Farshad-Sailhac complex wavelet function and Marquardt algorithm are combined research and applied to modeling geomagnetic anomaly sources in the Mekong Delta, which allow determining the characteristic parameters of the source such as: the position on the map, the depth, shape, three-dimensional (3-D) size, remanent magnetization vector. Since then, there are appropriate explanations on the geological nature of the sources causing magnetic anomalies in the study area, contributing to improve the efficiency of geophysical methods in Viet Nam.

A study on the diversity of Orchids in the Southern Viet Nam was conducted in 2018 and 2019 to assess the diversity of orchid species composition in this region. The methods were used including field investigation and sampling methods, morphological comparison method combined with looking up specialized documents on the Orchidaceae. The study results identified 324 species belonging to 84 genera. Among them, all species were used as ornamental plants; 22 species were used for medicinal herbs; and 10 species were listed for conservation in Viet Nam Red Data Book, Part II, Plants (2007); 324 species in the Decree 06/2019/ND-CP of the Government; 324 species in CITES. The life forms of Orchids were divided into groups including (1) epiphytes with 247 species, (2) terrestrials with 60 species, (3) saprophytes with 4 species, (4) lithophytes anh epiphytes with 8 species, (5) epiphytes and terrestrials with 3 species, and (6) epiphytes and terrestrials with 2 species. Specifically, Dendrobium indragiriense Schltr. is a new record for the flora of Viet Nam, and 64 species were added to the Southern Viet Nam.

In aquaculture processing, wastewater from preliminary treatment of shrimps mainly contains ammonium, nitrite, and nitrate. High nitrogen concentration in wastewater has resulted in increase of toxic compounds for aquatic organisms. Evaluation of the efficiency of wastewater treatment from aquaculture processing by IFAS model was carried out by two models: one was inoculated with indigenous nitrifying bacteria Pseudomonas aeruginosa ĐTW3.2, and the control treatment was not. Parameters including COD, BOD5 and N-NH4+ of the influent wastewater were recorded as 754.93 ± 94.69 mg/L, 584.67 ± 17.17 mg/L and 16.5 ± 1.24 mg/L, respectively. The efficiency of COD, BOD5 and N-NH4+ treatment after 3 days in the IFAS model incubated with strain ĐTW3.2 was 95.18%, 96.78% and 96.2%, respectively, significantly different (p

The present study was designed to evaluate the chemical composition, and the antibacterial activity of Dillenia ovata extracts. The chemical composition of the Dillenia ovata extracts was found to contain alkaloids, flavonoids, steroids, glycosides, saponins, tannins, and sesquiterpene lactones. The ethyl acetate extract of Dillenia ovata wood exhibited high levels of total flavonoids and polyphenols contents, which were 309,97±1,47 mg QE/g extract, and 44,28±0,15 mg GAE/g extract, respectively. Disc diffusion technique was used for in vitro antibacterial screening against Vibrio parahaemolyticus. Resazurin-based 96-well plate microdilution method was used to determine the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of Dillenia ovata extracts. The ethyl acetate extract of Dillenia ovata leaves exhibited the strongest antibacterial activity against Vibrio parahaemolyticus with 320

The main aim of this study is to synthesize and evaluate the physical chemistry, magnetic properties of Fe3O4 and Fe3O4@SiO2 core/shell nanoparticles using a simple and economical process. Fe3O4@SiO2 core/shell nanoparticles were synthesized from Fe3O4 nanoparticles formed by co-precipitation method and covered with SiO2 layer using silane molecules from tetraethyl orthosilicate (TEOS) as phase transition agent, and a strong base coating medium (NaOH). The results of X-ray diffraction analysis showed that Fe3O4 nanoparticles were high crystallinity. Analysis results of scanning electron microscopy and transmission electron microscopy showed that the obtained ferromagnetic nanoparticles had octagonal shape with fairly uniform size falling about 20 nm including SiO2 coating. Fourier modified infrared analysis for Fe3O4@SiO2 material showed that Si-O-Si, O-Si-O, Fe-O, Fe-O-Si peaks appear on the spectrum demonstrated the existence of silica on Fe3O4 nanoparticle surface. The superparamagnetic properties of the material was confirmed by the vibrating sample magnetometer results and the superparamagnetism (VSM) of Fe3O4 and Fe3O4@SiO2 90.54 emu/g and 68.42 emu/g, respectively.

The species composition and distribution of the springtails (Collembola) were studied based on samples collected from three types of habitats: natural forest, plantation and brushes-shrubs. The samples were taken by Gorny  and  Grum’ method (1993) in two seasons with the use of a specialized split core. The materials were subsequently extracted in a Berlese Tullgren’s apparatus for 7 days. Collembolan communities  were rather diverse in families, genera, species. In the three habitats studied where samples collected, natural forest was the most diverse one and were marked for a considerable contribution of forest species such as Lepidonella annucornis, Callyntrura sp.2, Dicranocentroides clitellatus, Arrhopalites sp.1, Ptenothrix sp.1. The characteristic species from artificial forest is Pseudachorutes dubius. Collembola represented in the shrub land are Sminthurus sp.1 and Neosminthurus sp.1. The distribution pattern, life forms and diversity of Collembola communities in the soils of Ba Vi National Park were influenced by the environmental conditions. Soil collembolans can be a good indicator of the type and degree or soil transformation in Ba Vi National Park.

Passion fruit seeds contain many compounds good for health such as antioxidant compounds, fiber, and essential fats. However, these seeds are currently only known as a by-product of passion fruit processing. This study was conducted to evaluate the applicability of passion fruit seeds in the processing of instant nut bars. Research results showed that passion fruit seeds accounted for 26.7% of total fruit weight, but 52.82% of total fruit polyphenols. The porosity of passion fruit seeds was improved when the seeds were treated with 3% NaHCO3 solution for 16 hours; then dried at 60°C to 9-10% moisture, then roasted. The instant nut bar based on recipe 2 containing passion fruit seed (15%), soybean seed, cashew nut, sesame seed, sunflower seed, brown rice, peanut, honey, and glucose syrup gave the product had a good sensory. Nutritional facts of this product, in 100 g, include carbohydrate 49.2 g, fat 25.3g, protein 17.2g, and 493 kcal. Besides, this product reached total phenolic content 367 mg GAE/100 g dm and antioxidant capacity DPPH 561.64 AAE g/100 g dm. After 30 days of storage at room temperature, the samples were packed in a polyamide bag and an aluminum-coated bag with a moisture content of 7.42-6.16%, water activity of 0.53-0.47, and peroxide content of 1.  32 and 1.90 meq/kg. Products packed in aluminum bags had lower peroxide content than those in polyamide bags.

Climate change has seriously affected people's lives and agricultural production in the Mekong Delta, of which saline intrusion is one of the main factors affecting agricultural productivity. Therefore, it is very urgent to study the transcriptome of salt-tolerant rice varieties representing the Mekong Delta. In this study, Doc Phung (salt tolerant) and nep Mo (salt sensitive) varieties were used to treat with 100 mM of NaCl for 12 hours at 14 days of seedling, the treated samples were collected and isolated total RNA for further analysis. The results showed that the total unique transcripts in Doc Phung (1596 genes) were more genes expressed than in Nep Mo (427 genes), and most of the transcripts in the two salected varieties responded to saline stress related to GO response to stimulus. These results showed that OsBREB family gene was candidated involving in the salinity stress, and can be used for further research.

The beet armyworm, Spodoptera exigua (Lepidoptera: Noctuidae) is the key pest threatening the production of vegetables in the Mekong Delta. Chemical insecticides have failed to control of this pest as this has developed resistance to almost all synthetic insecticides available. The insect pathogen, Spodoptera exigua nucleopolyherovirus (SeNPV) has been developed as a commercial biopesticides for control of beet armyworm. Studies were carried out to determine LC50 and LT50 values under larboratory conditions by using the first to fifth instars larvae with droplet feeding method. The lethal concentration (LC50) values of SeNPV against 1st, 2nd and 3rd instars larvae indicated (2.0-8.6) x 101 OBs/ml; (0.22-20) x 102 OBs/ml; (17-0.31) x 103 OBs/ml; (0.14-7.8) x 105 OBs/ml and (1.5-0.32) x 107 OBs/ml; respectively. The lethal time required to cause 50% mortality (LT50) for the larvae at the first to fifth instars ranges from 62.26 to 69.00 hours post inoculation (h.p.i); 102.00 to 113.26 h.p.i; 123.24 to 127.99 h.p.i; 139.51 to 152.50 h.p.i and 163.51 to 180.50 h.p.i; respectively.

Research on the physiological and biochemical metabolism according to the developmental age of tomatoes, NHP11 variety planted in 2019, in Thanh Hoa province from formation to maturity to determine the time of maturity of the fruit is the basis for the harvest and preservation of fruit. Results showed that tomatoes fruit reached the maximum size when being 46 days old. The content of chlorophyll a and b increased gradually from fruit formation to 26 days old, then decreased rapidly until the fruit was fully ripe, carotenoid increased gradually until the fruit ripens. Starch content and total organic acid content increased gradually and peaked at 26 days old, then gradually decreased. Reducing sugars and vitamin C content increased during the early stages and peaked at 46 days, then decreased gradually. The activity of α - amylase fluctuated following the fluctuation of starch and reducing sugars, catalase activity increased gradually and reached the maximum when the fruit was at 46 days old and then decreased, peroxidase activity increased continuously until the fruit ripens. This result shows that tomato fruit of NHP11 variety should be harvested at physiological maturity (46 days old) to ensure the high nutritional value and quality of the fruit during storage.

The research was carried out to propose urban agricultural models with high efficiency, sustainability, and harmony between socio-economic values and environment. Research methods include secondary data collection, 51 Key Informant Panels (KIP) internal area of urban agriculture sector, 10 Participatory Rural Appraisal  discussions, and land evaluation, 182 household surveys in Soc Trang city. The results showed that the agricultural system in the Soc Trang city is relatively diverse in terms of farming model and farming scale. The agricultural structure has 3 fields of crop cultivation, animal husbandry, and aquaculture fisheries. Moreover, the researchersidentified 23 important indicators for the planning and development of urban agriculture in Soc Trang city towards sustainability. In addition, this study has also proposed 6 potential development models in urban and suburban urban areas, including (1) ornamental plantss, (2) abalone mushroom cultivation, (3) hydroponic vegetables (inner area models); (4) high-quality rice, (5) safe vegetables and (6) dairy cow - biogas silage (peri-urban area).

The objective of this study is to evaluate the effects of different nutrient supplies and fertilizer dosage on the growth, yield, and quality of Red okra309. The experiment was carried out in a random complete block design with two factors and three replications. Factor A is three fertilizer formulas: (1) 120 N - 60 P2O5 - 60 K2O, (2) 60 N - 30 P2O5 - 30 K2O and (3) 30 N - 30 P2O5 - 30 K2O). Factor B is the three different sources of nutrient (1) chemical fertilizers, (2) vermicompost and (3) chicken organic manure. Necessary amount of nitrogen is provided by the applied fertilizer source itself, and insufficient phosphorus and potassium will be supplemented from mineral phosphorus and potassium fertilizers (monomers). Data were collected on growth and yield parameters including plant height (cm), plant diameter (cm), chlorophyll index, fruit length, fruit diameter, number of fruits and yield. The results showed that different nutritional sources have a significant effect on yield and quality of okra fruit. In addition, application of chemical fertilizers resulted in the lowest Brix level and the highest NO3- content. In contrast, organic fertilizers gave a high Brix level and a lower NO3- content than chemical fertilizers. Chicken manure and chemical fertilizers gave equal fruit diameter, number of fruits and fresh fruit yield, reaching the highest statistically significant differences compared with worm fertilization. There is a very strong positive correlation between yield and quality with fertilizer type and N dosage.

The objective of this study was to determine the morphological and chemical properties of soil profile in rice-shrimp system. Soil morphological characteristics were directly described by Munsell color chart in the field in Loc Ninh commune, Hong Dan district, Bac Lieu province. Soil samples were collected based on original horizons to analyze the chemical parameters. The results showed that soil profile as HD-LN-01 was classified as potential acid sulfate soil-sodium contamination, with deep presence of sulfidic materials while profiles HD-LN-02 and HD-LN-03 were named active acid sulfate soil, sodium contamination with deep presence of sulfidic materials. For soil chemistry parameters, pHKCl of surface soil was lower than 4.50 at ratio of soil: extraction liquid 1:5. Moreover, total nitrogen was evaluated at low threshold, and concentration of available ammonium in top soil layer was 3.98-9.07 mg NH4+ kg-1. Total phosphorus content was assessed at low level, concentration of soluble phosphorus in top soil layer was 1.93-8.34 mg P kg-1. Besides, soil phosphorus fractions of aluminum phosphorus, ferrous phosphorus and calcium phosphorus were evaluated at the high concentration. Moreover, exchangeable sodium content was determined 4.17-4.99 meq Na+ 100 g-1 while organic matter was assessed in ranging of very low to low level.

Agro-ecological conditions in Vietnam are quite diverse. This is an advantage for the development of different rice varieties to create a specific characteristic of each region. To improve the diversity of rice genetics resource, 20 upland rice were used to characterize the quality of rice including length grain, amylose contents, and aroma when they were plantted in two contrast ecological zones (1) Buon Ma Thuot province (highland); (2) Tra Vinh province (Mekong Delta) in this study. The results showed that These varieties cultivated in Tra Vinh were showed long gain and amylose content (80% and 60%, respectively) characteristics higher than in Buon Ma Thuot. In addition, 6 rice varieties were selected because of its high-quality characteristics such as long grain, low and medium amylose contents. While, two varieties Ba Bo Nha and Ba Hlang were suitable cultivated in both regions, Buon Me Thuoc and Tra Vinh. Mean while Ba Ĩe and Pkoih (aroma) were more suitable for planting in Tra Vinh, but Nâm and Ba Kong Brum varieties were better for planting in Buon Ma Thuot. The results of this study will provide quality rice genetic resources for 2 ecological zone including highland and Mekong Delta of Viet Nam.

Aeromonas hydrophila is a serious pathogen causing hemorrhagic disease, which leads to massive economic losses to inudustrial striped catfish culture. Therefore, the development of an effective vaccine to protect the striped catfish against A. hydrophila is imperative. The highly virulent of A. hydrophila strains was screened to dertemine LD50 values. The protective capacity of the vaccine was evaluated at 40-day post-vaccination with 4 vaccinated treatments and a control (no vaccination) treatment. The vaccine evaluation results upon challenge showed that the vaccine protected striped catfish with a high relative percentage survival value of up to 90-100% against A. hydrophila AH03 strain. The agglutination assay results showed that the specific antibody titers increased in vaccination treatments at 10-day post-inoculation (3.5-7) and decreased slightly (5-8) at 40 dpi. In conclusion, the inactivated A. hydrophila vaccine is a promising candidate providing significant protection for farmed striped catfish.

This study was carried out to determine the appropriate integrated culture of swamp eel Monopterus albus and Enhydra fluctuans for reducing nitrogen pollutant of intensive swamp eel aquaculture and improving production system. Three different combination methods of swamp eel and enhydra consist of 1) indirected combination system by using 100% water exchange from swamp eel tank supplied to Enhydra tank (NT1_eel, plant), 2) integrated swamp eel and Enhydra in the same tank (NT2_eel+plant) and 3) using aquaponic floating draft system (NT3_Aqua.eel, plant) were conducted. Swamp eel (initial size of 52g/ind.) was stocked at density of 1.5 kg/tank (9.4 kg/m3), and initial plant seed (root and branch) of 1.0 kg/tank. Swamp eels were fed adlibitum twice a day with pellets. The experiment was run for 90 days. The result showed that all environmental parameters of TAN (0.25-7.41mg/L), NO2- (0.27-1.91 mg/L), NO3- (31.28-57.69 mg/L), PO43- (8.54-9.83 mg/L), in which those water parameters in the NT3_aqua.eel, plant were stable and lower than those of other treatments. The highest weight gain was found for those swamp eels in the NT2, but there was not different significantly compared to those animal in the NT3 and NT1. Similarly, final biomass of plant in the NT3 (3.4 kg/m2) was higher significantly (p

Tomlinia frausseni Thach, 2014 – Ca na snail, an edible marine snail, mainly distributes on the coast of the Mekong Delta. Forty-two fishermen living in Tra Vinh coastal area were interviewed to evaluate the current status of fisheries of the species from March to May 2018. Semi-structured questionnaires chiefly focusing on technical and financial aspects, advantages, and disadvantages were used to collect data. The resources of T. frausseni was estimated using Catch–Effort methods between may 12th and September 19th, 2019. The results showed that originally, the gastropod fishing started in 2011, and annually, the exploiting season took place from March to October of the lunar calendar in the coastal zone. Longline cage traps were used to catch the snail with an average vessel capacity of 31.36 ± 2.23 CV and tonnage of 2.85 ± 0.13 tons/vessel. The annual fishing yield was 6.432,74 ± 207,98 kg/year. With 1.33 ± 0.03 million VND/trip to invest in a fishing trip, fishermen got return 1,87 ± 0,10 million VND/trip, and the equity rate of benefit was 0,40 ± 0,07 million VND/trip. The population size of Tomlinia frausseni was estimated to be 73,904 ± 6,684 kg (95% CI: 59,802, 88,006 kg) with a catchability of 9.894*10-4 (95%CI: 6.218*10-4, 13.570*10-4). Results of the investigation are baseline data for further research in biology and ecology of the gastropod in the Travinh coastal area.

This study is aimed to determine the effect of medium sources (NPK, Walne and BG11) and appropriate concentration of NPK fertilizer (16:16:8) on population growth of Scenedesmus sp. The growth of microalgae population was studied in two experiments: first with different nutrion sources (NPK, BG11 and Walne) and second with different NPK concentrations. Microalgae were cultured in 8 L glass bottles with initial density of 2×106 cells/mL. Light was provided from LEDs, illumination of 3000 Lux for 24/24, continuous aeration was supported during the experiment. The experiment was conducted under a room condition with controlled temperature (24.4±0.4°C). The results showed that Scenedesmus sp. cultured with NPK reached a maximum density of 35.1±1.1×106 cells/mL on day 13, a dry weight of 13.0±1.2 pg/tb, which is higher than that obtained with the remaining treatments. The protein and lipid content were 42.9% and 5.0% by dry weight, respectively. Scenedesmus sp. reached the highest algae density (33.2±0.2×106 cells/mL) when cultured with NPK 50 mg/L after 13 days of culture. Therefore, NPK can be used in Scenedesmus sp. biomass culture at a dosage of 50 mg/L to obtain the highest growth of microalgae populations

The present study was conducted to evaluate the ability of Bacillus sp., which was isolated from the extensive shrimp ponds (Tra Vinh, Bac Lieu and Ca Mau provinces), on organic matter decomposition and inhibition of pathogenic bacteria (Vibrio parahaemolyticus). The results showed that 83 selected strains of bacteria (44 strains had short rod-shaped, others had long rod-shaped and oval-shaped) were determined to be gram-positive, positive oxidase and catalase reactions, motile and spore-forming. This study also identified that 13 strains of bacteria (CM3.1, CM2.2, TV3.1, BT1.2, TV1.2, NH1.2, TB3.2, TB3.3, NH4.1, DH2.1, NH2.2, CN1.3, and TB4.3) were able to resist to V. parahaemolyticus. Among them, CM3.1 and TV1.3 exhibited high α-amylase, protease, and cellulose enzyme activities, and could be used for future research to develop probiotic products for aquaculture.

The study is aimed to assess the nutrient contents of the natural water environment in striped catfish farming areas, An Giang province. Findings of the study would provide warnings and measures for appropriate water quality management toward the sustainabledevelopment of striped catfish farming and protection of water resources in the area. Samples were collected at 3 sites in the Hau river and 3 sites in water supply canals in the intensive striped catfish farming areas. The samples were collected 4 times a year including March, June, September, and December, 2019. The results showed that nutrient contents at the water supply canals were higher than those on the Hau river. During the dry season, the nutrient contents tended to be higher than in the rainy season, especially in water supply canals. The water quality of the natural water surrounding the intensive striped catfish farming areas was directly affected by fish ponds. Phosphate, total nitrogen and total phosphorus concentrations were high at the sites sampling. It is, therefore, necessary to monitor and apply appropriate treatments when using water for different purposes.

Can Tho City, the center of the Mekong Delta region, play an important role in the region's socio-economic development. In the historical process, the land of Can Tho has had different names, including the name "Can Tho". This name was officially born in 1876 when the French protectorate established Can Tho county, then changed into Can Tho province. About the name "Can Tho", there are many studies mentioned. However, up to now, there are still different opinions. This article aims to exchange ideas to contribute to the clarification of the origin and meaning of the name "Can Tho" and some related names.

In this paper, a sociological investigation approach is applied to understand the adaptive level of Khmer students to learning ambience at Can Tho University in three main aspects such as self-study, in-class and extra-curricular activities. The result shows that Khmer students are quite adaptive in the self-study and have diversity in the way they chose to self-study. The interation between students and lecturers is only at medium level. There is a positive correlation between adaptability in learning and the level of student’s contribution in-class. For extra-curriculuar activities, the participation of Khmer students in their association, sport/music clubs, or voluntary groups is also at medium level. And duration of involment in such activities is not too long. From the research results, some solutions are proposed for the university, lecturers and students to improve capacity and avoid passiveness in learning of students in general and Khmer ethnicity in particular.        

Being influenced by Viet Nam's political and social situation, marriage relations have been mainly performed according to traditional customs. Through time, numbers of couples did not register their marriages under the legal procedures despite their long time de factor matrimonial relations resulting in having children and common property. This emerging issue required further legal regulations to ensure the parties' legitimate rights and interests. For that reason, the National Assembly enacted several regulations to govern the matter, including the 2000 Marriage and Family Law and other implementing documents. Under the current the 2014 Marriage and Family Law, Article 131(1) continues to provide rule to deal with the same matter; however, there are academic debates on the applicable law addressing the marriage and family relationships arising in cohabitation between men and women. The relevant legal documents and cases are evaluated and analyzed by using qualitative and descriptive methods to focus on the criteria to define a de facto marriage and the consequences of termination of such cohabitation and property disputes. In light of such analyses, the solution will be recommended for each situation basing on the application of the existing regulations.