Tài liệu, tai lieu

Synthesis, characterization and corrosion inhibitive ability of composites silica – polypyrrole - Vu Thi Hai Van
Figure 7 shows Tafel curves of steel coated with PVB and steel coated with PVB containing 10 % SP1, SP2, SP3 and SP4 in 3 % NaCl solution after 48 hours. The values of corrosion potential (Ecorr), corrosion current density (icorr), anodic and cathodic Tafel constants (βa, βc), polarization resistance (Rp) are given in table 3. Corrosion pote...
7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 922 | Lượt tải: 0
Interaction between triphenylphosphine or 1,2-Bis(diphenylphosphino)ethane with some complexes K[PtCl3(olefin)] (olefin: methyleugenol, safrole, isopropyl eugenoxyacetate)
The interaction between K[PtCl3(olefin)] (olefin: methyleugenol, safrole and isopropyl eugenoxyacetate) with triphenylphosphine (TPP) and 1,2-bis(diphenylphosphino)ethane (DPPE) have been studied for the first time. The results show that TPP and DPPE can coordinate with Pt(II) very favorably and they are able to replace the olefin in complex...
6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1003 | Lượt tải: 0
Extractive spectrophotometric methods for determination of ciprofloxacin in pharmaceutical formulations using sulfonephthalein acid dyes
This article reports the use of BCG, BPB and BTB as an anionic dyes for the extractive spectrophotometric determination of ciprofloxacin. The performance order of the proposed methods is BTB > BCG > BPB. No interference from common excipients was encountered. The proposed methods are found to be simple, sensitive, selective, accurate, precis...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 853 | Lượt tải: 0
Extraction of Lycopene from Gac Fruit (Momordica cochinchinensis Spreng) and Preparation of Nanolycopene
Nanolycopene was prepared by emulsification/solvent evaporation method using an Ultra-Turrax homogenizer. The feeding composition of sample S2 included 1 mg of BHT as antioxidation agent (table 2) while sample S1 was prepared without any anti-oxidation agent. The HPLC analysis showed that the lycopene content of S1 nanoparticles was 9.9 % whi...
6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1079 | Lượt tải: 0
A computational study on structure and stability of nitrogen-Doped titanium clusters TinN (n = 1-10) - Le Nguyen Ngoc Lan
Some concluding remarks are resulted from this theoretical study as follows: - The most stable isomers may have spin state ranging from doublet to quartet to sextet. - The ground-state structure of these clusters are built up by the nitrogen-addition rule. Thus, the nitrogen atom prefers to stay on surface of the clusters. - Doping with one...
6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 804 | Lượt tải: 0
Oxidation of benzyl alcohol to benzaldehyde over MnOx/sepiolite catalysts - Nguyen Thi Nhu
With XRD pattern of sepiolite and MnOx/sepiolite analyzed; manganese oxide existed as Mn3O4 on sepiolite nanofibers after the precipitation from nitrate salt. The morphology of sepiolite was slightly modified after calcincation process. The Mn3O4 particles were well distributed on the surface of the fibrous sepiolite and caused slight decreas...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 890 | Lượt tải: 0
3D cytotoxic and histon deacetylase (HDAC) inhibitory activities of triterpenoids isolated from leaves of Viburnum sambucinum
Two triterpenoid hupehenol D (1) and 12β-hydoxy- 3,15-dioxo-20,21,22-23,24,25,26,27- octanordammanrane (2) derived from leaves of Viburnum sambucinum were evaluated 3D cytotoxic and HDAC inhibitory activities for the first time. They displayed strong 3D cytotoxic activity on LLC spheroids with IC50 value of 3D cell is higher 3-5 fold than 2D...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 836 | Lượt tải: 0
The contribution of free radicals in paracetamol degradation by UV/NaClO - Le Truong Giang
Based on the results calculated above, we determined the relative contribution of each oxidizing agent on the PRC total degradation by UV/NaClO. The results were showed on figure 4. Based on the results showed on figure 4, we can see that the contribution of free radicals on PRC degradation is high. Particularly, at pH 5: the contribution of...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 907 | Lượt tải: 0
Triterpenes from Vitex limonifolia - Nguyen Thi Kim Thoa
Compund 3 was obtained as a white powder. The 1H-NMR spectrum of 3 showed the signals of three olefinic protons at H 5.41 (s), 5.71 (dd, J = 1.5, 10.5 Hz), and 6.01 (dd, J = 3.0, 10.5 Hz), two hydroxymethine protons at H 3.37 (br s) and 4.00 (dt, J = 4.0, 11.0 Hz), and six methyl groups at H 0.75 (s), 0.88 (s), 0.99 (d, J = 6.5 Hz), 1.00 (...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 1086 | Lượt tải: 0
Thermal properties, thermo-Oxidation and UV-thermo-humidity complex stability of polyethylene/modified fly ash/ultraflow composites
In conclusion, the HDPE/MFA/UTF composites have thermal oxidative, thermal and UV-thermal – humidity complex stability higher than HDPE/MFA composite and HDPE. Adding MFA and UTF into HDPE leads to the reduction in relative crystallinity of HDPE. The polymer chains of HDPE and the HDPE/MFA, HDPE/MFA/UTF composites were degradated by irradiat...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 838 | Lượt tải: 0

Thư viện tài liệu, ebook tham khảo dành cho học sinh, sinh viên