Time filter

Source Type

Can Tho, Vietnam

Can Tho University is a university in Can Tho, Vietnam. Established in 1966, it is a multidisciplinary university and a leading university in the Mekong Delta. vinh long University is a leading agricultural research center in Vietnam. Cần Thơ University has nine faculties and two research institutes. Wikipedia.

Nguyen T.D.,Vietnam Academy of Science and Technology | Phan N.H.,Ho Chi Minh City University of Technology | Do M.H.,Vietnam Academy of Science and Technology | Ngo K.T.,Can Tho University
Journal of Hazardous Materials | Year: 2011

We present a simple and efficient method for the fabrication of magnetic Fe2MO4 (M:Fe and Mn) activated carbons (Fe2MO4/AC-H, M:Fe and Mn) by impregnating the activated carbon with simultaneous magnetic precursor and carbon modifying agent followed by calcination. The obtained samples were characterized by nitrogen adsorption isotherms, X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM), and the catalytic activity in heterogeneous Fenton oxidation of methyl orange (MO) was evaluated. The resulting Fe2MnO4/AC-H showed higher catalytic activity in the methyl orange oxidation than Fe3O4/AC-H. The effect of operational parameters (pH, catalyst loading H2O2 dosage and initial MO concentration) on degradation performance of the oxidation process was investigated. Stability and reusability of selected catalyst were also tested. © 2010 Elsevier B.V. Source

Nguyen T.C.,Can Tho University
The International journal of prosthodontics | Year: 2011

The aim of this research was to explore the relationship between chewing ability and dental functional status, perceived oral health-related quality of life, and a number of background variables in a Vietnamese population. The cluster stratified sample consisted of 2,805 dentate subjects aged 20 years from urban and rural areas in Southern Vietnam. Chewing ability was assessed using a questionnaire that included questions on perceived difficulty with respect to eight foods and three questions of the Oral Health Impact Profile that were considered relevant. Only a minority reported serious problems with chewing ability (reporting difficult or very difficult to chew). The logistic regression analysis on chewing ability outcomes showed significant relationships between chewing ability and having 10 teeth in each arch, having sufficient molar regions ( 1 molar posterior occlusal pair [POP] bilaterally) for hard and soft foods, and having sufficient premolar regions ( 3 POPs), especially for hard foods. In the hierarchical functional classification system, likelihood to report complaints on chewing ability appeared to discriminate in the branch " 10 teeth in each arch." Likelihood at subsequent levels ranged from approximately 1.5 to 3. In the branch "< 10 teeth in each arch," likelihood did not discriminate because the groups lacked sufficient homogeneity. Chewing ability and oral health-related quality of life were positively correlated. Among all dental and other variables, decreased chewing ability was strongest when correlated with older age categories and not correlated or weakly correlated with sex, socioeconomic status, and residence. Source

Tsigie Y.A.,National Taiwan University of Science and Technology | Wang C.-Y.,National Taiwan University of Science and Technology | Truong C.-T.,Can Tho University | Ju Y.-H.,National Taiwan University of Science and Technology
Bioresource Technology | Year: 2011

This study investigated the possibility of utilizing detoxified sugarcane bagasse hydrolysate (DSCBH) as an alternative carbon source to culture Yarrowia lipolytica Po1g for microbial oil and biodiesel production. Sugarcane bagasse hydrolysis with 2.5% HCl resulted in maximum total sugar concentration (21.38g/L) in which 13.59g/L is xylose, 3.98g/L is glucose, and 2.78g/L is arabinose. Detoxification of SCBH by Ca(OH) 2 neutralization reduced the concentration of 5-hydroxymethylfurfural and furfural by 21.31% and 24.84%, respectively. Growth of Y. lipolytica Po1g in DSCBH with peptone as the nitrogen source gave maximum biomass concentration (11.42g/L) compared to NH 4NO 3 (6.49g/L). With peptone as the nitrogen source, DSCBH resulted in better biomass concentration than d-glucose (10.19g/L), d-xylose (9.89g/L) and NDSCBH (5.88g/L). The maximum lipid content, lipid yield and lipid productivity of Y. lipolytica Po1g grown in DSCBH and peptone was 58.5%, 6.68g/L and 1.76g/L-day, respectively. © 2011 Elsevier Ltd. Source

Kuenzer C.,German Aerospace Center | Tuan V.Q.,Can Tho University
Applied Geography | Year: 2013

In this paper we present the results of an ecosystem service value derivation for the Can Gio Mangrove Biosphere Reserve in Vietnam. We combine earth-observation-based mapping at the main species level with the result of an extensive socio-economic household survey to assess the value of direct and indirect ecosystem services provided by Can Gio's mangroves. Remotely sensed optical and radar data from 2011 were used to derive the precise extent of mangrove coverage. Household survey results led to an understanding of the value placed on mangroves by different occupational groups, namely, forest managers, fisherman, shrimp farmers, and other farmers. Common to all is a lack of understanding of the value of a natural resource if no direct income is generated. At the same time, depending on occupation, a clear trend towards appreciating and understanding the importance of mangroves can be observed: it is the highest with local and migratory fisherman, followed by forest managers, while shrimp farmers have the least knowledge about mangrove benefits, and also express the least willingness to further protect them. Values derived from the household surveys as well as secondary sources - in combination with remote-sensing-based mapping - enabled us to determine the ecosystem services value of Can Gio mangroves for selected categories of advantages. © 2013 Elsevier Ltd. Source

Dong P.V.,Vietnam Academy of Science and Technology | Nguyen T.P.,Can Tho University | Soa D.V.,Hanoi National University of Education
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We show that the typical 3-3-1 models are only self-consistent if they contain interactions that explicitly violate the lepton number. The 3-3-1 model with right-handed neutrinos can by itself work as an economical 3-3-1 model as a natural recognition of the above criteria, while it also produces an inert scalar triplet (η) responsible for dark matter. This is ensured by a Z 2 symmetry (assigned so that only η is odd while all other multiplets which perform the economical 3-3-1 model are even), which is not broken by the vacuum. The minimal 3-3-1 model can provide dark matter by a similar realization. Taking the former into account, we show that the dark matter candidate (Hη) contained in η transforms as a singlet in the effective limit under the standard model symmetry and is naturally heavy. The Hη relic density and direct detection cross section will have the correct values when the mass of Hη is in TeV range, as expected. The model predicts the Hη mass mHη= λ5×2 TeV and the Hη-nucleon scattering cross section σHη-N=1.56×10-44 cm2, provided that the new neutral Higgs boson is much heavier than the dark matter. © 2013 American Physical Society. Source

Discover hidden collaborations