• Removal of norfloxacin by TiO2-SBA-15 photocatalystRemoval of norfloxacin by TiO2-SBA-15 photocatalyst

    Abstract. Ordered SBA-15 mesoporous silica support was synthesized by a sol-gel method using triblock copolymer Pluronic P123 and immobilized with different amounts of photocatalyst TiO2. The synthesized composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 adsorption-desorption isotherms. The s...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 379 | Lượt tải: 0

  • PM2.5 - Bound pahs in the indoor and outdoor air of nursery schools in Ha Noi, Viet Nam and health implicationPM2.5 - Bound pahs in the indoor and outdoor air of nursery schools in Ha Noi, Viet Nam and health implication

    Abstract. Thirty two daily indoor and outdoor PM2.5 samples at sixteen nursery schools in Ha Noi were taken from March to April 2018. 15 individual PAHs were analyzed by GC/MS. Mutagenic potential (MP) and carcinogenic potential (CP) were used to evaluate carcinogenic and mutagenic risk contribution. The average PM2.5 concentrations were 38.7 μg...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 411 | Lượt tải: 0

  • Đề xuất cải tiến quy trình công nghệ sản xuất phèn nhôm từ cao lanhĐề xuất cải tiến quy trình công nghệ sản xuất phèn nhôm từ cao lanh

    TÓM TẮT Nhôm sunfat được sử dụng rộng rãi trong công nghiệp xử lí nước, công nghiệp giấy và công nghiệp dệt. Có nhiều hướng để sản xuất sản phẩm này và ở Việt Nam, cao lanh là nguồn khoáng dồi dào. Do đó chúng tôi đã nghiên cứu sản xuất nó bằng phương pháp hòa tách cao lanh trong dung dịch axit sunphuric. Trên cơ sở các thông số công nghệ tối ư...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 447 | Lượt tải: 0

  • Nghiên cứu hoạt tính kháng khuẩn của hoạt chất α-Mangostin tách ra từ vỏ quả măng cụt Garcinia mangostana LNghiên cứu hoạt tính kháng khuẩn của hoạt chất α-Mangostin tách ra từ vỏ quả măng cụt Garcinia mangostana L

    TÓM TẮT Trong số các hợp chất xanthone từ vỏ quả măng cụt, hợp chất α- mangostin được chứng minh là có hàm lượng cao nhất chiếm khoảng 0,02 - 0,2 %. Nhiều nghiên cứu đã chứng minh, hoạt chất α- mangostin có hoạt tính kháng khuẩn, chống viêm, chống oxy hóa và chống ung thư. Trong bài báo này, hoạt chất α- mangostin được tinh sạch từ vỏ của quả m...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 473 | Lượt tải: 0

  • Production of poly(3-hydroxybutyrate) from raw cassava starch by Bacillus megaterium D8Production of poly(3-hydroxybutyrate) from raw cassava starch by Bacillus megaterium D8

    Abstract. Biosynthesis of polyhydroxyalkanoate (PHA) from raw cassava starch as the carbon source by bacteria was investigated in this study. About 300 bacterial colonies were isolated from soil samples. Among them, sixteen bacterial strains were found to produce PHA from cassava starch. Strain D8 produced the highest poly(3-hydroxybutyrate) (P...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 438 | Lượt tải: 0

  • Reaction of some salicyl aldehyde derivatives with amines andphenyl acetyleneReaction of some salicyl aldehyde derivatives with amines andphenyl acetylene

    Abstract.Salicylic aldehydes, amine, and phenyl acetylene could react under the solvent-free, metal-free conditions to form propargylamines 1-4 via A3 coupling reaction. The yield of the reaction was up to 83% for 5h. In acetonitrile, the amine became a catalyst to form 6-bromo-3-(5-bromo-2-hydroxybenzyl)-2-phenyl-4Hchromen-4-one (5). Under micr...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 521 | Lượt tải: 0

  • Molecular dynamics simulations of structural properties of CuNi alloys during the cooling process at high pressureMolecular dynamics simulations of structural properties of CuNi alloys during the cooling process at high pressure

    Abstract. Molecular dynamics simulations of Cu80Ni20 (Cu:Ni = 8:2) model with the size of 8788 atoms have been carried out to study the structure and mechanical behavior at high pressure of 45 GPa. The interactions between atoms of the system were calculated by the Quantum Sutton-Chen embedded-atom potentials. The crystallization has occurred d...

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  • Effect of zinc oxide nanoparticles on growth and development of dendrobium officinale kimura et migo in in vitro culture mediumEffect of zinc oxide nanoparticles on growth and development of dendrobium officinale kimura et migo in in vitro culture medium

    Abstract. Zinc-oxide nanoparticles (ZnO-NPs) has positive effects on the growth and development of plants at appropriate concentrations. This study aimed to test the effect of ZnO nanoparticles with concentrations from 0 mg/L to 5 mg/L individually or in combination with ZnSO4 on growth and development of in vitro Dendrobium officinal at 3 stag...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 490 | Lượt tải: 0

  • A new algorithm for multi-skill resource constrained project scheduling problem based on cuckoo search strategyA new algorithm for multi-skill resource constrained project scheduling problem based on cuckoo search strategy

    Abstract. The purpose of this paper is to consider the project scheduling problem under such limited constraint, called Multi-Skill Resource-Constrained Project Scheduling Problem or MS-RCPSP. The algorithm proposed in this paper is to find the optimal schedule, determine the start time for each task so that the execution time (also called make...

    pdf12 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 425 | Lượt tải: 0

  • Determination of the mass diffusion coefficient of H2O diluted in N2 using classical molecular dynamic simulationDetermination of the mass diffusion coefficient of H2O diluted in N2 using classical molecular dynamic simulation

    function of center of mass velocity has been used to deduce the mass diffusion coefficient (D) of water diluted in nitrogen using the Classical Molecular Dynamics Simulations (CMDS). The calculations have been performed at room temperature (296 K) for different mixtures of H2O in N2 and for 2.107 molecules from a five-sites potential. The results s...

    docx7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 393 | Lượt tải: 0