• Structural simulation of Mg2SiO4 under compressionStructural simulation of Mg2SiO4 under compression

    Abstract: The microstructure in Mg2SiO4 glass under high compression is studied by molecular dynamic method. This work revealed the correlation between pair radial distribution functions (PRDF) of Si-Si pair and bond angle distribution (BAD) of Si-O-Si and focus on clarifying the split peak of Si-Si PRDF. Moreover, visualizing the bonds of Si-Si...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 446 | Lượt tải: 0

  • Fabrication and characterization of CoFe2O4/CoFe2/SiO2 nanocomposite particlesFabrication and characterization of CoFe2O4/CoFe2/SiO2 nanocomposite particles

    Abstract: The CoFe2O4/CoFe2/SiO2 nanocomposite particles were synthesized using a sol- gel method and calcination in hydrogen. The magnetic properties and structure of nanocomposite particles calcinated at 600 oC and 900 oC in range of calcination time from 1 h to 4 h were investigated. The phase composition, surface morphology and magnetic prop...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 482 | Lượt tải: 0

  • Study of supporting electrolytes of KCl-Acetate buffer - NH4Ac for simultaneous determination of Zn2+, Cd2+, Cu2+, Pb2+ in acid mine drainage in Mao Khe, Quang Ninh by anodic stripping voltammetry at hanging mercury-drop electrodeStudy of supporting electrolytes of KCl-Acetate buffer - NH4Ac for simultaneous determination of Zn2+, Cd2+, Cu2+, Pb2+ in acid mine drainage in Mao Khe, Quang Ninh by anodic stripping voltammetry at hanging mercury-drop electrode

    Abstract. The simultaneous determination of Zn2+, Cd2+, Cu2+, Pb2+ in acid mine drainage (AMD) by differential pulse-anodic stripping voltammetrics (DPASV) with high sensitivity, selectivity, and accuracy is difficult because of many influential factors in the waste-water. This paper presents the results of studying supporting electrolyte for si...

    pdf11 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 485 | Lượt tải: 0

  • Reality and measures for developing integrated teaching capacity of chemistry teachers in high school and chemistry teacher studentsReality and measures for developing integrated teaching capacity of chemistry teachers in high school and chemistry teacher students

    Abstract: Integrated teaching competence is one of the most important competencies teachers capacity adapting to the requirements of reforming the general education curriculum. Researching and application of an integrated teaching perspective has been interested by many educators and teachers to research and apply in teaching practice. However, ...

    pdf10 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 475 | Lượt tải: 0

  • Vinalabeo, a new generic name for Vinalabeo tonkinensis (Cyprinidae, teleostei)Vinalabeo, a new generic name for Vinalabeo tonkinensis (Cyprinidae, teleostei)

    Abstract: Vinalabeo n. gen. (Labeoninae, Cyprinidae, Cypriniformes) belongs to be Varicorhinus tonkinensis, and is separated from the genus Sinilabeo. Vinalabeo is characterized mainly as follows: The unbranched ray of dorsal and anal fins are ossification and smooth. Other identifications are: Pre-dorsal distance grip shapenon-scale cover in b...

    pdf5 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 518 | Lượt tải: 0

  • Quantum condensation in a two-component system of atomsQuantum condensation in a two-component system of atoms

    Abstract. The Cornwall-Jackiw-Tomboulis (CJT) effective action at finite temperature is applied to study the quantum condensation of a two-component system of atoms. We derive the renormalized effective potential in the Hartree-Fock approximation, which preserves the Goldstone theorem. Numerical results show that there exist quantum condensation...

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  • Structural, optical and electrical properties of undoped and al doped-ZnO films for use in photovoltaic devicesStructural, optical and electrical properties of undoped and al doped-ZnO films for use in photovoltaic devices

    Abstract. ZnO films are deposited on glass substrates using a sol-gel spin coating method. To investigate the influence of Al doping concentration on structural, optical and electrical characteristics of films, Al doping concentrations are varied from 0% to 5%. The surface morphology, structure and optical transmittance characteristics of the fi...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 473 | Lượt tải: 0

  • Down regulation of zinc finger protein 280D (ZFP-280D)Down regulation of zinc finger protein 280D (ZFP-280D)

    Abstract. This study demonstrated that high transcript expression levels of ZFP-280D in melanocytes and in benign tumors of 304 Ret mice, a transgenic mouse line in which a systemic skin melanosis, benign melanocytic tumors and malignant melanoma which develop stepwise were inhibited in melanoma cell lines (human and murine) and in the malignan...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 527 | Lượt tải: 0

  • Fish species composition in the Red river and its tributaries in the Yen Bai province, VietnamFish species composition in the Red river and its tributaries in the Yen Bai province, Vietnam

    Abstract. The fish community of the Red River and its four tributaries (Ngoi Hit, Ngoi Thia, Ngoi Lao and an unnamed Ngoi) was elucidated from October 2009 to August 2010. During the period of study, 110 species belonging to 69 genera, 20 families and 7 orders were identified. Previous works have identified 120 species, 74 genera, 20 families a...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 557 | Lượt tải: 0

  • Fish species composition and their distribution of the Pho Day river, Northern VietnamFish species composition and their distribution of the Pho Day river, Northern Vietnam

    Abstract. In six surveys conducted at 11 locations along the Pho Day River, Northern Vietnam, from April 2006 to April 2007, 1203 fish specimens were collected and analyzed. 87 species of fish of 66 genera, 20 families and 6 orders were found. No survey of Pho Day fish fauna had previously been conducted. Perciformes is the most diverse with 7 ...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 586 | Lượt tải: 0