Optimization of ultrasonic extraction for determination of 16 polycyclic aromatic hydrocarbons in air particle - Hanh Thi Duong4. CONCLUSIONS The ultrasonic extraction procedure for determination of 16 typical polycyclic aromatic hydrocarbons (PAHs) in air particles was optimized. This method is quick, simple and costeffective. The extraction steps were minimized therefore it avoids contamination. Moreover, the method produced the high recovery rates for 16 PAHs with go...
11 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 515 | Lượt tải: 0
Investigation of cerium (III) activated-Ceria Nanoparticles as corrosion inhibitors for carbon steel. CONCLUSIONS This work focused to investigate the corrosion protection performance of cerium salt activated-cerium(IV) oxide nanoparticles in NaCl solution and in organic coating by comparative study with CeO2 nanoparticles and Ce(NO3)3. The size of CeO2 nanoparticles obtained about 11 nm by homogeneous precipitation technique. In a 0.1 M NaCl...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 567 | Lượt tải: 0
Catalytic activity of Cr2O3/sepiolite in the oxidation of benzyl alcohol - Nguyen Tien Thao. CONCLUSIONS Two chromium oxide/sepiolite catalysts with different Cr2O3 loadings synthesized by precipitation route had finely dispersed Cr2O3 particles on the magnesium silicate. The prepared materials possessed high surface area and porosity and were used as catalysts for the oxidation reaction between C6H5CH2OH and t-BuOOH at milder condit...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 498 | Lượt tải: 0
Effects of CoD/TN ratio and loading rates on performance of modified sbrs in simultaneous removal of organic matter and nitrogen from rubber latex processing wastewater - Duong Van Nam4. CONCLUSION The modified SBRs consisting of both oxic and anoxic zones showed high performance in the simultaneous removal of organic matter and nitrogen from rubber latex processing wastewater even under very simple operation modes without any separate anoxic phases and without any additional energy for recycling or mixing mixed liquor. The...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 472 | Lượt tải: 0
Synthesis and application of chitosan/graphene oxide/magnetite nanostructured composite for fe(III) removal from aqueous solution - Le Dang Truong4. CONCLUSIONS In the present work, graphene oxide (GO) was successfully synthesized by Hummers method and it was used to prepared chitosan/magnetite/graphene oxide (CS/Fe3O4/GO) - a novel magnetically separable adsorbent - by a simple co-precipitation route. The Fe3O4 nanoparticles 5 10 15 20 25 5 4 3 2 C e /q e (g/L) C e (mg/g) wi...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 480 | Lượt tải: 0
A study on the localized corrosion inhibition for mild steel in saline solution - Nguyen Dang Nam4. CONCLUSIONS This paper mainly reports the advantage of the Y(4NO2Cin)3 compound to perform highly efficient inhibitor suitable for mitigating corrosion and localized corrosion of mild steel in an aggressive chloride environment. The results indicated that corrosion rate of mild steel increased with an increase in Cl¯ ion in aggressive soluti...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 478 | Lượt tải: 0
Stability and electronic properties of isomorphous substituted Si7-XMnx+ - Nguyen Thi Mai4. CONCLUSION The method of density functional theory using the B3P86 functional and the 6-311+G(d) basis set has been employed to optimize geometrical structures following by frequency calculations of the clusters Si7+, Si6Mn+ and Si5Mn2+. Dissociation energies are calculated and the most preferred decay paths of the clusters have been identif...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 429 | Lượt tải: 0
Numerical simulation of airflow around vehicle models - Nguyen Van Thang4. CONCLUSIONS Numerical simulation of air flow over a vehicle is carried out in this study. The air speed is 40 m/s. The 3D Ahmed model with the rear slant angle of 25 degrees is used to validate. In order to estimate effects of a rear wing attached on the vehicle, the BMW M6 model is employed. Results of velocity, pressure, turbulence kinetic...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 461 | Lượt tải: 0
Ammonia-Removal efficiency of a novel acinetobacter calcoaceticus strain isolated from industrial wastewater of ninh binh coal nitrogenous fertilizer plant - Do Bien Cuong4. CONCLUSION A novel Acinetobacter calcoaceticus HUST-C8 was isolated from local industrial wastewater. It exhibited efficient ammonium removal ability which yielded 88 % of initial 150 mg/L of ammonium after 10 hours at 37 °C, pH 8.5 with inoculator of 7 % and aeration speed of 4.5 v/v/min. The simple operation, efficiency and strong adaptabi...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 458 | Lượt tải: 0
Fatigue crack growth at the representative zones in friction stir welding of a heat-Treatable aluminium alloy at 200 - Tran Hung Tra4. CONCLUSIONS The effect of the elevated test temperature on the FCG in the TMAZ and HAZ of AA6063- T5 FSW joints was studied. The FCG rate in each zone was sensitive to the test temperatures. Eventhougt the TMAZ possessed a fine grain microstructure, the FCG rate in this zone was higher than that in the coarse grain zones. The role of the res...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 444 | Lượt tải: 0
