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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 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...
11 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 575 | Lượt tải: 0
Reality 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, ...
10 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 572 | Lượt tải: 0
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...
5 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 651 | Lượt tải: 0
Quantum 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...
6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 599 | Lượt tải: 0
Structural, 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...
6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 567 | Lượt tải: 0
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...
7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 620 | Lượt tải: 0
Fish 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...
7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 727 | Lượt tải: 0
Fish 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 ...
6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 722 | Lượt tải: 0
Colormetric determination of total chromium content in water, rice and vegetable samples by 1,5-diphenylcarbazide
Abstract. A colorimetric determination the total chromium content based on DPC reagent was established in detail. All operations were done under the optimal conditions of pH = 1.65, a ratio of nDPC/nCr(VI) = 2.18 (by mol) and use of a calibration plot for the determination of total chromium established as A = (0.8324 ± 0.00901).CCr + (0.0086 ± ...
8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 528 | Lượt tải: 0
Research on the production of candied orange slices
Processing candied orange slices is one of the basic measures to help prolong the shelf life of products compared to raw oranges. The purpose of this study is to create candied orange slice products from chanh orange with good nutritional and organoleptic value, contributing to diversifying jam products in the market and increasing income for ...
6 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 592 | Lượt tải: 0

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