Quantitative nuclear magnetic resonance based on pulcon methodology: Application to quantification of some standard materials and natural productsCurrently, both internal standard quantitative nuclear magnetic resonance (IS qNMR) and external standard quantitative nuclear magnetic resonance (ES qNMR) methods are not widely disseminated in Viet Nam. In this report, the PULCON (Pulse Length-Based Concentration) based ES qNMR method was applied for quantification of two standard materials (...
9 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 481 | Lượt tải: 0
Study on the chemical constituents and antioxidant activity of Hibiscus sabdariffa L. CalyxHibiscus sabdariffa L. is an herbaceous medicinal plant, believed to be native to Western Africa. The calyx is commercially important in the food industry and various parts of the sorrel plant have been used in folk medicine for the prevention of diseases such as cardiovascular disease and hypertension. However, to date, the studies on the chemi...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 285 | Lượt tải: 0
Tổng hợp vật liệu tổ hợp trực tiếp rGO/thanh nano NiO bằng phương pháp nhiệt thủy phân và nghiên cứu các tính chất của vật liệu tổ hợpVật liệu tổ hợp giữa graphen oxit đã khử (rGO) với thanh nano NiO được tổng hợp trực tiếp (in-situ) bằng phương pháp nhiệt thủy phân với các hàm lượng graphen oxit (GO) (% khối lượng của GO trong vật liệu tổ hợp là 0,0, 0,5 và 1,0% khối lượng GO). Trong đó, GO được chế tạo từ mảnh nano graphen bằng phương pháp Hummer và được đưa trực tiếp vào du...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 480 | Lượt tải: 0
Fermions, gauge bosons and higgs masses in the 3-3-1-1 model with charged leptonIn this paper, a new version of 3-3-1-1 model was proposed to solve the Landau pole problem of the previous versions. The masses of fermions where the masses of active neutrinos are generated through the seesaw mechanism, are calculated in detail. All the Higgs bosons and gauge bosons as well as their masses are identified and calculated.
13 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 260 | Lượt tải: 0
Study on adsorption of nickel and methylene blue in aqueous solution by magnetic carboxylate-rich carbonIn this study, magnetic carboxylate-rich carbon material (Fe3O4@CRC) was synthesized via a low-temperature carbonization method and applied as an adsorbent for adsorption of Ni(II) ions and methylene blue (MB) in aqueous solution. The synthesized Fe3O4@CRC was characterized by various techniques (XRD, FTIR, FE-SEM, TEM, EDX, VSM, and BET). The a...
14 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 334 | Lượt tải: 0
Highly selective separation of CO₂ and H₂ by MIL-88A metal organic frameworkCO2 capture is indispensable for a cleaner environment and mitigation of global warming. The pre-combustion CO2 capture relates to the separation of CO2 from H2 in the syngas mixture. Recently, metal-organic frameworks have proven to be excellent candidates for this purpose. In the current work, MIL-88A (Fe, V, Ti, Sc) were studied for the first...
13 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 288 | Lượt tải: 0
Synthesis and waterproofness improvement of K₃AlF₆:Mn⁴+ phosphor for warm white light-emitting diodesIn this study, we synthesized K3AlF6:Mn4+ phosphor by co-precipitation method and investigated its crystal structure and photoluminescence properties . By surface modification of K3AlF6:Mn4+ using K3AlF6, the moisture resistance performance of the phosphor can be significantly improved. It was found that the luminescence performance of K3AlF6:Mn...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 431 | Lượt tải: 0
Dependence of hydrothermal time on structural characteristics and photocatalytic properties of SnO₂ nanoparticlesIn this work, SnO2 nanoparticles were prepared by hydrothermal method using SnCl4.5H2O and NaOH at 180 °C for different hydrothermal times. The effect of hydrothermal time on the crystal structure, morphology, chemical bonding, and photocatalytic properties of SnO2 nanoparticles was studied. Structural and morphological characteristics of SnO2 n...
9 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 247 | Lượt tải: 0
Steady state calculations of the PWR MOX/UO₂ core with the monte carlo code MCNP6This paper presents the steady-state analysis results of the OECD/NEA and U.S. NRC PWR MOX/UO2 (MOX: Mixed Oxide) Core Transient Benchmark with the modern MCNP6 Monte Carlo code based on the ENDF/B-VII.1 evaluated nuclear data library. The purpose of the paper was to verify an MCNP6 model proposed for calculations of a heterogeneous MOX/UO2 fuel...
10 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 420 | Lượt tải: 0
Extraction of triterpenoids from the vietnamese red ganoderma lucidum by ultrasound-assisted extraction method and anti-oxidant activity of extractAn ecofriendly ultrasound – assisted extraction (UAE) method was developed for the triterpenoids extraction from Vietnamese red Ganoderma lucidum (G. lucidum). The appropriate kind of solvent for extraction procedure was selected as ethanol based on the yield of triterpenoids obtained, followed by the investigation of four single factors includi...
11 trang | Chia sẻ: thuyduongbt11 | Ngày: 16/06/2022 | Lượt xem: 328 | Lượt tải: 0
