Learning strategies are considered as the most essential tool to help language learners gain active and self-directed involvement in the learning process (Oxford, 1990). Therefore, much research has been being conducted all over the world (Oxford and Nyikos, 1989; Aliakbari & Hayatzadeh, 2008; Aslan, 2009; Nguyen & Trinh, 2011) in order to prove the effectiveness of language learning strategies in enhancing language learners? proficiency level. In this study, with the aims of investigating the frequency level and the gender difference in using language learning strategies of 201 non-English freshman of Can Tho University (Vietnam), the 50-item Strategy Inventory for Language Learning (SILL) (Oxford, 1990) was employed. On the basis of the findings, the researchers make some pedagogical impicaltions for EFL teachers and learners at Can Tho University.

The study aimed to analyse production efficiency and its determinants to profit of farmers who raising rice field. The results indicate that farmers taking part in the model of large paddy fields in Vinh Binh village, Chau Thanh District, An Giang province are more efficient than others, it increased farmers? income, profit and limit production risks for households. It is called that the model is developed in the future at their local area.  

The article uses different models of regression and time series to forecast Vietnam's paddy output based on past data. Using statistical criterions in making model to find the most appropriate model, from there forcasting paddy output for the next five years by  this model.

Nanofiltration (NF) has become a widely accepted process not only for producing drinking water but also for recovering wastewater in industrial processes or removing pollutants from industrial wastewater effluent. In the textile industry, the treatment of various dye baths with NF at room temperature have already been studied and was found feasible at lab-scale and also pilot scale. The aim of this study was to investigate the capacity of textile wastewater effluent treatment of two nanofiltration DS5DL, DS5DK in a temperature range from 20oC to 70oC for both synthesis dye and real dye bath. The performance of the NF membranes was evaluated by measuring the water flux, salt and colour rejection. A membrane damage was observed for the membranes DS5DL at high temperature (>50oC) and this was elimintaed from the next experiment series. The permeate quality of NF membrane DS5DK was satisfactory enough to recycle these effluents in reactive dyeing at elevated temperature (above 50oC) for water and energy savings. Moreover, the fouling effect at higher temperature (>50oC) on NF membrane increased the Na2SO4 and colour rejection slightly and the platicizing or swelling effect on water flux and retention of salt and color were also observed. There was a correlation between the results of experiments with synthetic solution and with real wastewater.

Chitosan, derived from chitin in the shell of black tiger shrimp (Penaeus monodon), was chemically modified with glutaraldehyde to make cross-linked chitosan microspheres. In this study, the effects of preparation methods, stirring time and speed on the characteristics of chitosan microspheres have been studied. In the same experimental conditions, morphology of chitosan microspheres made by emulsification method was more uniform particle size than that of by mechanic method, and one-pot chemically modified method gave chitosan microspheres with the best desired charaterizations. The longer stirring time and quicker stirring rate, the more uniform particle and anticoagulation of the chitosan microspheres. The morphology of microspheres was studied using scanning electron microscopy (SEM) and it was shown that microspheres had a spherical shape and smooth surface. In the comparison of adsorption rate of Cu2+, larger (2.5-4 mm) cross?linked chitosan microspheres showed slower and smaller (2-10 mm) cross-linked chitosan microspheres showed faster.

This article builds the theoretical model of the planning quality for construction industry from the following components: Architecture with the strong national identity, Capacity for the project consultation, Resources for the construction industry and Openness and transparence of projects calling for investment. In this study, the researcher combined  the qualitative method with the quantitative method through the use of Cronbach alpha (a coefficient of reliability) and EFA (Exploratory factor analysis) to evaluate and adjust the scale. After that, CFA (Confirmatory Factor Analysis), SEM (Structural Equation Modeling). The research method used to test the measurement model and the research model (the theoretical model). The official sample size (310 samples in Soc Trang province?s market) were analyzed. The test results showed that there is the suitability of the theoretical model with market information and the research results have the practical significance for many different research subjects in the field of contruction. The relevant subjects are the business enterprise in the field of contruction consulting, the departments of the construction project management, the investors, the state management agencies in the field of contruction, especially the department of construction that is managing the planning quality for construction industry of Soc Trang province.

Study on the economic efficiency of three offshore vessel groups categorized based on engine capacity (hp) (hp

This paper presents the research results of the condition for coconut oil?s transesterification using ethanol and catalyzing Candida rugosa (LCR) and Porcine pancreas (LPP) enzymes. Using the optimal method of single-objective function of one-level Box-Wilson model, the optimal conditions of reactions for obtaining the highest yield were determined. The results show that the highest yield is 0.76% for LCR (ethanol concentration of 98°, stirring speed of 250 (ring/min) and the time of 6 h); and for LPP, the highest yield is 0.82% (ethanol concentration of 97°, stirring speed of 225 (ring/min) and the time of 5,2 h). In addition, when the two-level Box Behnken Design model is used, the conditions for LCR are found: ethanol concentration of 98,0178°, stirring speed of 214,085 (ring/min) and the time of 5,9999 h. Under these conditions, predicted the yield is 0.8582% (however, the highest yield obtained when experimental condition values are rounded is only 0,815%). Similar procedure was appied for LPP and the results show ethanol concentration of 98.3579°, stirring speed of 248,5 (ring/min), the time of 6,9999 h; and the highest predicted yield is 0.8516% (0,752%). The conclusions from this research is that: with one-level Box Wilson model, the three conditional factors are directly proportional to the yield for LCR; while stirring speed and the time are directly proportional to the yield and ethanol concentration is inversely proportional to the yield for LPP. With two-level Box Behnken Design, the three conditional factors are directly proportional to the yield for both LCR and LPP.

Sustainable development is a global issue and affects the economic development of each country. This article focused on building the scale of the sustainable development of enterprises from the interaction components such as Sustainable economy ? sustainable environment ? Sustainable society. In this study, the researcher used EFA (Exploratory factor analysis) and based on the survey samples with 106 enterprises that are operating in Bac Lieu province to build the scale. The results indicated that the scale for the sustainable development of enterprises is meaningful to the research market and after being added the social security factor in the research model.

A data-based mechanistic modeling approach was developed to online predicting of product temperature during heating of canned food. Fish paste and minced meat were used as material for model development. Step input of heating medium from 60 to 115oC was applied while product temperature was recorded by using thermocouples type T. The simplified refined instrument variable (SRIV) algorithm was used as the model parameter identification tool to obtain the best model order and parameters. A first order transfer function from the dynamic response of product temperature from heating medium with high coefficient of determination and low standard error explained the heat exchange in a system. By model compacting, the measured data and the model providing a physically meaningful parameter related to a heat transfer coefficient from heating medium to product could be used for online predicting of product temperature during heat treatment.

Under the Vietnamese Constitution and other related legislation, the courts must give judgment independently. There have been many statutory provisions promulgated to help the courts achieve this aim. However, in practice, the judges and jurors usually work under many negative impacts including illegal intervention by other state-organs and non state-organs as well as the limits of laws. These factors are actually significant influences which can result on unfair judgments.

In recent years, many methods have been proposed for the identification problem of Vietnamese pronunciation. This paper introduces a different technique using the zero-crossing point and mathematical tools to extract the characteristics of the Vietnamese words by different voices and different speakers.

This study was caried out to determine the optimal concentration of paclobutrazol (PBZ) and Potassium chlorate (KClO3) as collar drenching on the flowering of thirteen-year-old mangosteen trees in Cau Ke district - Tra Vinh province, 2009/2010 season. The factorial experiment with two factors was arranged in randomized completely design, three replications, each replication had a tree. The first factor was PBZ concentrations (0; 1.0 and 2.0 g a.i./m canopy diameter) and the second factor was KClO3 concentrations (0; 20 and 40 g a.i./m canopy diameter). Paclobutrazol and KClO3 were applied as collar drenching when the leaves were 2.0-month-old. The results showed that PBZ and KClO3 did not affected on flowering time and increased flowering ratio as well as yield. Trees treated with PBZ at 1.0 or 2.0 g a.i. per meter of canopy diameter had flowering ratio and yield higher than that of non-treated ones. The results also showed that trees treated with KClO3 at 20 or 40 g a.i a.i. per meter of canopy diameter had also flowering ratio and yield higher than that of non-treated ones. Treating PBZ 1,0 g a.i. combination with KClO3 at 40 g a.i. or PBZ 2,0 g a.i. combination with KClO3 at 20 g a.i. /m canopy diameter had flowering ratio and yield higher than those of other combinatorial interactions; however; treating PBZ 2,0 g a.i. combination with KClO3 at 40 g a.i. /m canopy diameter decreased flowering ratio and yield. Both PBZ and KClO3 decreased fruit size and effected on the ratio of inner gamboges of mangosteen fruit.

We consider quasivariational inclusion problem in topological vector spaces. Sufficient conditions for the solution existence are established. Applications to somes special cases of quasivariational inclusion such as Ky Fan inequality, variational inequality and optimization problem.

The results from a direct survey of 65 members of the seven cooperative groups and 47 farmer households out of the groups in Phong Dien district, Can Tho city reveal that the group members utilize livelihood assets more efficiently than the farmers outside the groups do. The results of study indicates that the cooperative group contributes significantly to the members for improving of using livelihood assets regarding to social and financial capitals such as, the group members having more oscasion to contact local state officers, participating in more technical courses, accessing to financial sources and credits more preferentially, using the investment capital more profitably and making higher margin than the farmers without joining the groups. However, the data also addresses that the group plays an uncertain role in improving to utilization of livelihood assets relating to human, physical and natural capitals.  

Hyperglycemia increase in oxidative stress results in diabetic complication. This study evaluated the anti-diabetic potential of ethanolic extracts from root, leaf, green and ripe fruits of Morinda citrifolia by determining their antioxidant and antihyperglycemic activities in vitro and in vivo. The antioxidant activity was determined through the measurement of DPPH radical scavenging activity in vitro. Mice were induced diabetes by using alloxan monohydrate. The extracts of Morinda citrifolia could suppress hyperglycemia in diabetic mice by the oral intake. Finally, the antioxidant effect of these plant extracts in the kidneys of experimental diabetic mice was observed through the total antioxidant status (TAS) in kidney of mice. The results showed that oral administration of ethanolic extracts (200 mg/kg ì 2 times/ day) could make lower the glucose level of blood as well as the commercial antidiabetic drug (glucofast), and reduced oxidative stress-mediated damage in diabetic kidneys. The results also proved that Morinda citrifolia ethanolic extracts improved the DPPH radical scavenging activity in vitro.

This study was conducted to evaluate the combined effects of different temperatures (28, 32 and 34oC) and salinities (10, 20 and 30?) on the algal clearance rate, condition index and survival rate of clam Meretrix lyrata at different sizes: small (SL: 14.71±0.39mm); medium (SL: 23.15±0.31mm) and large (SL: 36.03±0.69mm). Clams were cultured in 200-liter composite tank and were fed daily with algae diets consist of Chlorella sp. from Tilapia green water system at the density of 300,000 cells/ml. After 30 days of experiment, clams were cultured at salinity of 30? and temperature of 34oC showed highest mortality (40%, 62.2% and 100% coresponding to small, medium and large clams). In contrast, the highest survival rates were obtained at temperature of 28oC and salinity of 10? (100%, 100% and 46.7%, respectively). High temperature together high salinity significantly reduced the survival of clams at different sizes, especially medium and large sizes. This study contributes initial information for the effective management of farming clam in practices.

In many universities around the world, thesis is required for Master's programs, especially research-oriented Master. The assessment of thesis is usually conferred to the councils of thesis. This approach hides many problems for universities which don?t have experience in scientific research and postgraduate training ; it can lead to inaccurate assessments and can even cause negative impacts to training. This article aims to set out objective and scientific criteria for evaluating.

The study aims to identify factors that affect decission of community to participate in Community based Tourism (CBT) organizations in An Giang province. Data was collected from 135 households (80 households were participated and 55 household have not participated in CBT) in My Hoa Hung commune (Cho Moi district) and Chau Phong commune (Tan Chau district), An Giang province. The results of binary logistic regression model show that there are 5 factors affect decission to participate tourism organization of the community such as: education level, size of household, revenue household, social capital and traditional handicraft. The results also identified that size of household is the most important factor which affects the decission to participate in developing tourism of the community.

Zeolite A, a white powder, was synthesized by the hydrothermal reaction of activated kaolin (metakaolin) derived from commercial kaolin, a low cost mineral, with  sodium aluminate. In this study, the effects of added quantity of sodium aluminate, concentrations of sodium hydroxide solutions on the characteristics of zeolite A and the yield of the product have been studied. The morphology of zeolite A crystals was determined using scanning electron microscopy (SEM) and it was shown that particles had a cubic shape, characteristics of standard zeolite A.

The research was conducted to determine the effect of water stress duration under with or without mulching conditions on off-season flowering of Ha Chau Baccaurea. An experiment was carried out on 8 year old plant in Phong Dien district, Can Tho city in the period of  August 2010 to  July 2011. The experiment was arranged with the factorial complete randomized design, four replications with respect to one tree for each. The first factor was water stress duration (20, 30 and 40 days) combined with or without mulching by the thin plastic sheet (second factor). The results reflected that water stress prolonged in 20 to 40 days caused of shedding 38-40%, reducing like-gibberellin content in the leaf and decreasing total nitrogen as well as C/N ratio and finally creating off-season flower in with a high flowering rate (>80%) and increasing the bunch weight, but it did not effect to the yield and fruit quality. Mulching before causing water stress 20 days helped the increase of flower number per inflorescence, fruit forming ratio and bunch weight. However, in the case water stress was prolonged to 30-40 days, mulching did not bring the similar effects.

The paper represents classification problem by Bayesian method from discrete data through program estimating n ? dimenstion probability density function, classifing a new element and calculating Bayes error which are written on Matlab software. The programs are used to for specific applied from real discrete data.

This research aimed to analyze the situations when Vietnam?s fisheries exported to Japanese market, and to identify technical barriers to help such companies find causes leading to Japanese-importer-qualitative unsatisfying. The study used secondary data, methods of comparison of absolute and relativism. The study also suggested some recommendations to impulse the fishery export into this market.

Data based mechanistic modeling approach was developed to predict particle temperature during pasteurization of liquid/particulate canned food. Fish balls in CMC solutions were filled in a 307x203 can as the examples of liquid/particulate canned food. During the experiments, step input of hot water was applied while particle temperature was recorded. The simplified refined instrument variable (SRIV) algorithm was used as the model parameter identification tool to obtain the best model order and parameters. A transfer function in form  from the dynamic response of particle temperature from heating medium with high coefficient of determination, low standard error, and low in YIC explained the heat exchange in a system. The measured data and the model providing a physically meaningful parameter related to both heat transfer coefficient from heating medium to liquid, and from liquid to particle could be used for  predicting of particle temperature and calculating F value during pasteurization process.

Urban areas play an important role in the development of zones, regions and even the whole country. Therefore, building legal criterions to determine and classify urban areas are an extremely important task. Inaccurate definitions and classification to urban areas will result not only on the decrease of urban but also the waste investment. For that reasons, regulations of urban classification must be exact and consistent. This article aims to set out some problems of current rules related to urban classification as well as proposes some solutions on these issues.

The paper presents results of microstructural investigation of (Al2O3).2(SiO2) by means of molecular dynamics method with Born-Mayer potentials, periodic boundary conditions. Simulation were done in the basic cube containing 1650 ions with six different systems at temperature of 2500 K and different densities, pressure ranging from 0 GPa to 25 GPa, and with five different systems at pressure of 0 GPa, temperature ranging from 1000 K to 5000 K were prepared. Microstructure of constructed systems has been observed and analyzed through the structural parameters such as radial distribution function, coordination numbers, polyhedrons SiOx and AlOx (x=4, 5 and 6).

The research segments pakage tour market in Can Tho city based on benefit-soughts by tourists. A factor-cluster analysis identified three distinct segments: Empathy requirement tourists, Trip cost attention tourists and Comfort, safety, experience requirement tourists. Besides, the demographic characteristics of segments show the statistically differency in occupation, marial status and monthly income. Based on the different benefit-soughts of pakage tour that each segment appreciates with high cores and the different demographic characteristics among three segments, the research help pakage tour businesses choose target segment(s) and propose solutions for their target market in order to promote available advantages, better meet customer needs and better compete in pakage tour market of Can Tho city.

Ho Bieu Chanh was a writer who gained many achievements when writing about peasants. He not only discovered and highlighted the beauty of the Southern peasants? personality but also got an insight into their status in a certain period of the history. Ho Bieu Chanh?s novels reflected the peasants in Southern rice fields who lived in poverty and illiteracy as well as had a poor social position. In fact, Ho Bieu Chanh is the novelist of Southern countryside. Ho Bieu Chanh?s novels put a long term impact because of expressing his concerns about life and releasing his stresses of social context. These works are about not only the past issues for criticism but also the present issues for further thinking about valuable moral lessons.

The research examines domestic tourists? satisfaction, post-purchase behaviors with tourism in Soc Trang province and factors deciding satisfaction and willingness to return of the tourist. A set of attributes using to examine tourists? satisfaction is measured by    5-point Likert scale. Gap analysis (Importance and Satisfation) and IPA (Importance_Performance Analysis) model help to propose strategies for tourism businesses in Soc Trang. Besides, discriminant analysis finds out factors deciding the differences of satisfied tourists and unsatisfied tourists with tourism in Soc Trang; and the differences of the willingness to come back and not willingness to come back. The results of the study propose the solution for the tourism of SocTrang province in order to enhance the level of satisfaction and the willingness to return of domestic tourists.

The objective of this study is to determine biocatalysis of the coconut oil?s transesteri?cation reaction with ethanol using commercially puri?ed free Candida rugosa (LCR) and Porcine pancreas (LPP) lipase. Evaluating the key conditions parameters affecting lipase activity and stability bases on identi?ng ester index and yield. The best result has achieved when ester index and yield of LCR and LPP catalyzing are respectively 7.03(mg KOH/g), 0.81% in 35°C, the phosphate buffer pH 7.0, stirring 250 (ring/min), 6 h and 6.01(mg KOH/g), 0.73% in 35°C, the borate buffer pH 9.0, stirring 200 (ring/min), 5 h. Conversion in the best condition of reaction is identified to base on GC/FID analysed method; however, the cost is relatively expensive. The result shows that conversion of LCR catalyzing is 0.77% better than LPP catalyzing is 0.43%. From this studying result, free lipase enzymes for catalyzes transesterification of conditions is established (but yields is low); and the method to determine ester index in order to determine reaction?s yield, is also relatively good.

A study on maturational characteristics of Round scad (Decapterus maruadsi) distributed in the Soc Trang-Bac Lieu coastal areas was conducted from January to December, 2011. Results of the study showed that the condition factors (CF) of fish ranged from 0.00395 to 0.09304 with the highest Cf was observed in May and those of lowest from June to July. Highest values of the gonad somatic index (GSI) of female fish was observed in May and September while the lowest one in January and July. Highest values of GSI of male fish was observed in May and September while the lowest one in February and November. The highest percentages of fish those possessing stage IV gonads found in May and September while those of lowest was in January and February. Based on CF and GSI, spawning season of Round scad may occur in May and September. The absolute fecundity of Round scad ranged from 16,680 to 102,980 eggs and the relative fecundity from 147 to 844 eggs/g of female fish, in which the body weight of female fish ranged from 113.15 to 121.95 g/individual.