Tài liệu, tai lieu

Structure and chemical bond of carbodiylide complexes [W(CO)5{C(ECp*)2}] (E = B to Tl): DFT calculations - Nguyen Thi Ai Nhung
The calculated structures of the W5-C1E complexes show that ligands C1E are bonded in an arrangement that is tilted with respect to the metal fragment W(CO)5. The theoretical calculation of BDEs suggests that the bond strength of complexes increases from the boron complex W5-C1B to the strongest bonded thallium adduct W5-C1Tl. Analysis of th...
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 982 | Lượt tải: 0
Effect of fly ash on mechanical properties and morphology of plasterboard based on recycled poly(ethylene terephthalate)
After immersing in 30 % HCl solution, plasterboard with 150-175 phr fly ash loading indicated the lowest changed values (0.1-0.2 %) whereas plasterboard with 100 and 200 phr fly ash loading caused a more significant change in values (0.5-0.6 %). Chemical resistance such as acid and base resistance have a key role in applications. The presenc...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 770 | Lượt tải: 0
Membrane processes and their potential applications for fresh water provision in Vietnam - Duong Cong Hung
Treatment and reclamation of wastewater can be a practical measure for fresh water augmentation and in tandem environment protection in Vietnam [48]. Wastewater treatment can exploit conventional activated sludge (CAS) technology or membrane bioreactors (MBRs), which integrate a low-pressure membrane filtration with a conventional biological ...
12 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 1018 | Lượt tải: 0
A fluorescent chemodosimeter based on rhodamine derivative for detection of Hg(II) ions studied by using the density functional theory - Phan Tu Quy
The fluorescent chemodosimeter RT based on rhodamine derivative for detection of mercury ions was studied, including the synthesis process, characteristics and applications. The optimized geometry and the electron properties of RT and RG were identified at the B3LYP/LanL2DZ level of theory with a combination of AIM and NBO analysis. The obta...
9 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 1015 | Lượt tải: 0
Chemical constituents of the lichen Dermatocarpon luridum and pKa value of isolated mycosporine - Nguyen Thi Thu Tram
In the previous work, the authors have shown that mycosporine 1 has a strong absorption at 310 nm in the region of UVB (290-320 nm) with high ε 12540 M-1.cm-1 suggesting the potential application as a natural photoprotectant [4]. Such compound contains one acido-basic site, however, its dissociation constant has never been published so far. ...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 1046 | Lượt tải: 0
Effect of chromium substituted on structural and magnetic characterization lithium ferrite nanoparticles - Nguyen Thi Lan
Li0.5Fe2.5-xCrxO4 spinel nanoparticles (x = 0, 0.5, 0.75, 1 and 1.25) were obtained by using a citrate sol-gel method. The samples have the cubic spinel structure at room temperature with the lattice constant a slightly decreases with increasing Cr content. The good crystallinity single domain particles has average diameter 22-30 nm. The core...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 841 | Lượt tải: 0
Mg-Al-MoO4 layered double hydroxides used as catalysts for the oxidation of styrene - Nguyen Tien Thao
Moreover, the catalytic activity does not only vary with the reaction temperatures but also depends on the oxidant nature. In practice, Figure 5A presents the different catalytic activity as different oxidants are introduced into the styrene reactant. It is worthily noted that three examined oxidants all express the good ability to oxidize st...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 828 | Lượt tải: 0
Synthesis of new hemiasterlin derivatives with α,β-Unsaturated carbonyl-thiophene groups in fragment A
To a cooled (0 oC) solution of 14a (50 mg, 0.102 mmol) in 2 mL MeOH/H2O (2:1) was added LiOH (25 mg, 1.02 mmol). The cooling bath was removed, and the resulting mixture was stirred at room temperature for 10 h. The solvent was removed in vacuum and the residue was dissolved in a small amount of H2O. The aqueous solution was cooled to 0 oC, a...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 800 | Lượt tải: 0
Thermokinetic study of the isomerization of isocyanic acid - Nguyen Huu Tho
There are eight existent feasible isomers on the potential energy surface [H, N, C, O], in which isocyanic acid and cyanic acid are the most stable isomers. The HNOC isomer contains a N O unstable donor – acceptor bond is intermediate complex forming CO, NH products. Isomerizations are difficult to occur at normal temperature and pressure co...
6 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 715 | Lượt tải: 0
Degradation of tartrazine dye from aqueous solution by heterogeneous fenton-Like reaction on Fe2O3/SiO2 composite - Vu Van Tu
In this study, the Fe2O3/SiO2 composite has been successfully prepared via a simple impregnation method. The Fe2O3 with small particle size was highly dispersed on silica and exhibited excellent efficiency for the Fenton degradation of tartrazine, 98.5 % in 80 min. It was much higher than that of physic mixture Fe2O3/SiO2, and other materials...
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 1035 | Lượt tải: 0

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