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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (29)
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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (29)
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  • 1
    Online Resource
    Online Resource
    Benthic cyanobacteria composition and microcystin concentration in the sediment of the Tri An Reservoir
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Biotechnology Vol. 20, No. 1 ( 2022-03-30), p. 163-171
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 20, No. 1 ( 2022-03-30), p. 163-171
    Abstract: The occurrence of cyanobacterial blooms (CYBs) associated with cyanotoxins has been reported worldwide. While planktonic cyanobacteria and the contamination of microcystin (MC) in the water column have been the subject of many investigations, little attention is paid to the benthic cyanobacterial communities and MC concentration in the benthic environment. This study aimed to investigate the benthic cyanobacterial composition and MC concentration accumulated in sediment from the Tri An Reservoir (TAR), Dong Nai province. Benthic cyanobacterial communities and sediment were collected at five sites in dry and rainy seasons. The benthic cyanobacterial communities were morphological observation and identification. Different nitrogen, phosphorus species, and chlorophyll-a (Chl-a) in sediment were analyzed. MCs concentration in sediment was quantified by High-Performance Liquid Chromatography (HPLC). Results indicated that the sediment from the TAR was contaminated with nitrogen. A total of 19 species belonging to 12 genera, 3 orders of cyanobacteria were identified. In which, Anabaena, Oscillatoria, and Microcystis were the three most commonly found in the samples. Surface sediment samples contained high densities of colonial Microcystis. The Chl-a concentration in sediment in dry and rainy seasons ranged from 1.96–3.45 and 0.71–3.15 µg/g fresh weight (FW), respectively. MC was detected in sediment at all sites in both dry and rainy seasons with a concentration up to 191.4±14.2 ng/g FW. The outcome of this study provides basic knowledge on MC and potential MC-producing cyanobacteria in a drinking water supply. Further investigation on the toxic producing ability of the benthic cyanobacteria species from the Tri An Reservoir is required.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/15367
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Effects of non-toxic filamentous cyanobacteria isolated from tri an reservoir on 〈i〉Daphnia〈/i〉
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Academia Journal of Biology Vol. 42, No. 3 ( 2020-08-26)
    Details
    In: Academia Journal of Biology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 42, No. 3 ( 2020-08-26)
    Abstract: This study is aimed to examine whether the presence of non-toxic filamentous cyanobacteria can cause toxic effects on Daphnia magna. Six strains of Oscillatoria perornata were isolated from the Tri An Reservoir and cultured in our laboratory for investigation. The results revealed that all strains were negative with the mcyA moleculer marker. The high performance liquid chromatography (HPLC) results showed that toxin was not detected in their culture products, indicating that these strains corresponded to non-toxin producing strains. However, the results of chronic assay indicated that these non-toxin producing O. perornata conferred toxic effects on the tested animals. The age at first reproduction of D. magna was delayed and the survival of D. manga decreased in proportional with the increase of the density of cells of O. perornata exposed. Significant differences in the life history responses were observed for D. mangna exposed to O. perornata. These results suggested that bioactive secondary metabolites other than microcystins produced by the filamentous cyanobacteria O. perornata may contribute to the toxic effects on Daphnia. Besides cyanotoxins, other secondary metabolites must be taken into account when investigating the toxic effects of cyanobacteria.   
    Type of Medium: Online Resource
    ISSN: 2615-9023 , 2615-9023
    URL: Article
    DOI: 10.15625/2615-9023/v42n3.13900
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Overview of precious stones, half precious tones, fine arting stones, ashlar facing stones and potentiality of them in the Tay Nguyen zone
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2015
    In:  VIETNAM JOURNAL OF EARTH SCIENCES Vol. 37, No. 1 ( 2015-07-24)
    Details
    In: VIETNAM JOURNAL OF EARTH SCIENCES, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 37, No. 1 ( 2015-07-24)
    Type of Medium: Online Resource
    ISSN: 0866-7187 , 0866-7187
    URL: Article
    DOI: 10.15625/0866-7187/37/1/6549
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2015
    SSG: 6,25
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    Online Resource
  • 4
    Online Resource
    Online Resource
    CURRENT UNBALANCE REDUCTION IN LOW VOLTAGE DISTRIBUTION NETWORKS USINGAUTOMATIC PHASE BALANCING DEVICE
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2017
    In:  Vietnam Journal of Science and Technology Vol. 55, No. 1 ( 2017-02-09), p. 104-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 55, No. 1 ( 2017-02-09), p. 104-
    Abstract: This paper presents the application of anAutomatic Phase Balancing Device (APBD) to reduce current unbalance in low voltage distribution networks. The proposed algorithm allowsus to calculate the unbalanced level and to conduct the automatic phase balancing device during load variations. This device was then applied to a low voltage feeder of Cau Giay district (Viet Nam). Results show that the unbalanced current is always maintained lessthan 15 %.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/0866-708X/55/1/8330
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2017
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  • 5
    Online Resource
    Online Resource
    Optical Properties of \(\text{CuInS}_{2}\) Thin Films Prepared by Spray Pyrolysis
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2012
    In:  Communications in Physics Vol. 22, No. 1 ( 2012-05-07), p. 59-64
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 1 ( 2012-05-07), p. 59-64
    Abstract: Polycrystalline CuInS\(_{2}\) (CIS) absorber films for solar cells were prepared by spray pyrolysis of aqueuos solution of copper chloride, indium chloride and thiourea onto heated glass substrates. By optimizing the spray parameters, such as reducing/increasing the temperature of the substrate and molar ratio of Cu/In in the spraying solution, the optical characteristics of films, which are well matched to the solar spectrum, were identified. In all cases, those CIS thin films were of p-type conductivity. Transmission measurements were performed to examine the optical properties of the films; the absorption coefficient and the optical band gap of the films were calculated by transmission spectra. The absorption spectra of the films showed that this compound is a direct band gap one and its gap varied between 1.30 - 1.78 eV. Those thin films were analyzed by X-ray diffraction in order to understand the effect of layers structure on their optical properties.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-22-1
    DOI: 10.15625/0868-3166/22/1/633
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2012
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Influence of Spray Rate on Structural and Optical Properties of Sprayed ZnO Films
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2014
    In:  Communications in Physics Vol. 24, No. 3S1 ( 2014-11-13)
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 24, No. 3S1 ( 2014-11-13)
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    URL: Article
    DOI: 10.15625/0868-3166/24/3S1/5236
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2014
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  • 7
    Online Resource
    Online Resource
    Multi-correlation between nematode communities and environmental variables in mangrove-shrimp ponds, Ca Mau Province, Southern Vietnam
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Academia Journal of Biology Vol. 42, No. 3 ( 2020-08-26)
    Details
    In: Academia Journal of Biology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 42, No. 3 ( 2020-08-26)
    Abstract: Multi-correlation between bio-indices of nematode communities and ecological parameters in mangrove-shrimp farming ponds in Tam Giang commune, Nam Can District, Ca Mau Province, Vietnam were investigated. In which, diversities of nematode communities and several environmental variables in eight ponds were considered to process. Our findings underlined the high diversity of nematode communities in mangrove-shrimp farming ponds compared to other mangrove habitats. Nematode diversities provided more oppotunity in natural food for shrimp. Single correlation analyses showed that the species richness index correlated significantly to three variables (salinity, total organic carbon, and total nitrogen), the Margalef diversity index correlated to two variables (salinity, total organic carbon), and the expected number of species for 50 individuals index correlated with one variable (salinity). Results of multi-correlation analyses between the nematode bio-indices and the environmental variables were completely different from those of single-correlation analyses. In multi-correlation analyses, the species richness and the Margalef diversity index correlated to two variables (salinity, total organic carbon), Pielou’s evenness index and Hill indices correlated with dissolved oxygen, also the Hurlbert index correlated to total organic carbon. Hence, it is necessary to pay attention to the impact of complex interactions between the multi-environmental variables and nematode communities. This research aims to explain the differences between single- and multi-correlation for evaluation of the effects of environmental factors on nematodes as well as aquatic organisms. 
    Type of Medium: Online Resource
    ISSN: 2615-9023 , 2615-9023
    URL: Article
    DOI: 10.15625/2615-9023/v42n3.14546
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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    Online Resource
  • 8
    Online Resource
    Online Resource
    ADVANCED WASTEWATER TREATMENT BY HYDRAULIC AUTOMATIC FLOATING MEDIA FILTER
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Science and Technology Vol. 55, No. 4C ( 2018-03-24), p. 291-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 55, No. 4C ( 2018-03-24), p. 291-
    Abstract: A pilot scale experiment was carried out in tertiary wastewater treatment using hydraulic automatic floating filter. The hydraulic automatic floating media filter has been working with 120 cm depth of polystyrene bed. Wastewater from secondary biological treatment of WWTP was treated  in the pilot filter with filtration velocity  of 4 m/h. Oxygen concentration was remained constantly at level 2.0 mg/l by using an ejector.  Headloss development and evaluation of SS, COD, NH4+ removals during filtration were objectives of the study. The experiment results showed that concentrations of SS, COD and NH4+ in effluent wastewater were kept lower than 5 mg/l, 30 and 0.5 mg/l respectively for almost filtration cycle. Effects of treatment in SS, COD and NH4+ were 88.27 %, 68.54 % and 5.59 %, respectively.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/55/4C/12166
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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  • 9
    Online Resource
    Online Resource
    MAGNETIC PHASE TRANSITION AND MAGNETOCALORIC EFFECT OF RE0.7Sr0.3MnO3 POLYCRYSTALLINE MATERIALS
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Science and Technology Vol. 59, No. 6A ( 2022-03-11), p. 105-114
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 59, No. 6A ( 2022-03-11), p. 105-114
    Abstract: In this report, we present some results of the magnetic phase transition nature and magnetocaloric effect of four polycrystalline ceramics of RE0.7Sr0.3MnO3 with RE = La, Pr, Nd and Sm, which were prepared by solid phase reaction method. X-ray diffraction data shows that all samples are single phase of RE0.7Sr0.3MnO3. The sample with RE = La belongs to the rhombohedral structure (space group: R3-c), whereas the other remaining samples belong to the orthorhombic one (space group: Pbnm). We pointed out that the difference in ionic radius at the RE site plays an important role in modifying the nature and Curie temperature (TC) of the ferromagnetic-paramagnetic phase transition of RE0.7Sr0.3MnO3 compounds. Namely, the RE = Nd sample has the characteristics of the first-order magnetic phase transition with TC = 242 K. Meanwhile, for RE = La, Pr, and Sm, the materials exhibit the characteristics of the second-order magnetic phase transition with TC = 360, 262, and 98 K, respectively. Among these, the magnetic phase transitions of two compounds with RE = Pr and Nd occur near room temperature with very large magnetocaloric effects. The values of the maximum magnetic entropy changes are higher than 3 J/kgK under magnetic field change of 10 kOe, suggesting their potential application in the field of civil magnetic refrigeration. The nature of the magnetic phase transition and the characteristic quantities related to the magnetocaloric effects of the RE0.7Sr0.3MnO3 compounds were studied and discussed in detail through the temperature and magnetic field dependences of the magnetization data.  
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/16378
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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    Online Resource
  • 10
    Online Resource
    Online Resource
    First report on toxicity of the cyanobacterium Planktothrix rubescens isolated from a fish pond in Soc Trang province
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2016
    In:  TAP CHI SINH HOC Vol. 38, No. 1 ( 2016-01-14)
    Details
    In: TAP CHI SINH HOC, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 38, No. 1 ( 2016-01-14)
    Type of Medium: Online Resource
    ISSN: 0866-7160 , 0866-7160
    URL: Article
    DOI: 10.15625/0866-7160/v38n1.6919
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2016
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