Tổng hợp tài liệu Khoa Học Tự Nhiên tham khảo cho học sinh, sinh viên.
After 7 days burned, all three treated groups were found to be not different by the external morphology. From day 7 to day 12, the morphology of 3 treatment groups was changed. The area of the wound had significant changes, especially in group treatment by nCur-CP that decreased from 82.2 ± 17.35 mm2to 12.2 ± 4.9 mm2 (p < 0.05). After 20 days of...
10 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 600 | Lượt tải: 0
The MnAC samples were successfully prepared via magnetic stirring and ultrasonic stirring methods. The resulted samples are amorphous structure with 32~42% MnO2 loading. The magnetic stirring prepared sample has spherical particles while ultrasonic stirring sample has mixed spherical and rod-like particle. The introducing of manganese oxide resu...
12 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 610 | Lượt tải: 0
MgHAp coatings have been successfully synthesized on 316L SS substrate by the electrodeposition method. The optimal conditions were chosen to deposite MgHAp coatings. The obtained MgHAp has single phase crystals of HAp, fibrous shape and the content of 0.2 wt% Mg and 1.2 wt% Na similar to natural bone which could be improved mechanical prope...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 455 | Lượt tải: 0
Using combined chromatographic and spectroscopic methods, three flavonols including 5,7,3’,4’- tetramethylquercetin (1), 3’-hydroxy-3,5,7,4’- tetramethoxyflavone (2), and 3,5-dihydroxy-7,3',4'- trimethoxyflavone (3) were isolated and structurally identified from the methanol extract of the aerial parts of O. stamineus Benth. All of the isolat...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 686 | Lượt tải: 0
Three-component-oxide CaO-CuO-CeO2 was successfully fabricated via the sol-gel method. XRD result showed the single phase of CeO2 when the contents of Cu and Ca was kept below 15 and 7.5 mol.%, respectively. The material fabricated at aging temperature of 70 oC, calcination at 600 oC for 30 min possessed the highest phenol conversion (96.3 %...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 453 | Lượt tải: 0
Results from this study demonstrate the great viability of seawater AGMD desalination for fresh water provision in remote coastal areas in Vietnam. During the AGMD process of seawater, the operating conditions, particularly feed temperature and circulation rate, strongly affected the process water flux. Operating the process at high feed tem...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 486 | Lượt tải: 0
The thermal stability of the material is evaluated by Thermogravimetric Analysis (TGA). The results of TGA analysis of material samples based on NBR/PVC blend are shown in figures 6-8 and table 3. When replacing 1 phr CB by CNT, thermal stability of the rubber blend continues to rise (onset decomposition temperature increased by nearly 10°C)...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 463 | Lượt tải: 0
The B3P86/6-311+G(d) quantum chemical calculation method has been employed for searching the stable geometrical structures of Si11, Si11Mn+, and Si11Mn0 clusters. While for the lowest energy structure of Si11Mn+ cationic cluster, the Mn dopant locates outer the Si11 cage forming the exohedral isomer, the endohedral isomers which have relative...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 494 | Lượt tải: 0
The molecular formula of 3 was suggested as C29H48O (M = 412) by the ESI-MS ion peak at m/z 411 [M-H]- and NMR data. The 1H-NMR spectrum of 3 showed signals for 6 methyl groups at δH 0.55 (3H, s), 0.79 (3H, d, J = 6.5 Hz), 0.80 (3H, s), 0.81 (3H, t, J = 7.5 Hz), 0.85 (3H, d, J = 6.5 Hz) and 1.03 (3H, d, J = 6.5 Hz). Besides, the presence of ...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 484 | Lượt tải: 0
By simply tuning the (K++Na+)/Nb5+ molar ratio from 9.0 to 12.0, the pure rhombohedral and orthorhombic NaNbO3 microcrystals were selectively synthesized by an additive-free hydrothermal procedure using commercialized Nb2O5, NaOH, KOH as starting materials at 180 and 200 oC, respectively, for 24 h. The results showed that the phase compositi...
4 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 509 | Lượt tải: 0
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