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- 저자 : Tien Cao-Hoang (검색결과 3 건)
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Design of a Cost Effective Soil Monitoring System to Support Agricultural Activities for Smallholder
Tien Cao-Hoang,Trong Tinh Pham Van,Can Nguyen Duy 한국디지털융합학회 2017 IJICTDC Vol.2 No.2
The moisture, temperature and electrical conductivity of soil are the important properties for agriculture. It is necessary to monitor such data in order to support the agricultural activities, especially improve the yield and reduce the irrigation water. However, the currently commercialized monitoring systems are too expensive for the smallholder who has less than two hectares of farmland. The objective of this study is to develop a cost effective system for monitoring the soil data, which consists of a monitoring device and a web-based application. The monitoring device measures the soil information every one hour and then transmits such data to the cloud for storing and visualizing. The system has been testing in the experiment field to evaluate the system’s stability.
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Improving photocatalytic oxidation of semiconductor (TiO2, SnO2, ZnO)/CNTs for NOx removal
Hoang Phuong Nguyen,Thi Minh Cao,Tien-Thanh Nguyen,Viet Van Pham 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Traditional semiconductors, i.e., SnO2, ZnO, and TiO2 have a good photocatalytic activity but still manydisadvantages to applying in industry. In this study, these semiconductors are combined by commercialCNTs to form heterojunctions by a ball-milling route. The physical–chemical analyses include X-raydiffraction pattern (XRD), diffused reflectance spectra (UV–Vis DRS), Fourier transform infrared spectrum(FTIR), Mott-Schottky analysis, high-resolution transmission electron microscopy (HRTEM), and selectedarea electron diffraction (SAED) are run to characterize the as-prepared materials. The total photocatalyticNOx efficiency of SnO2/CNTs, ZnO/CNTs, and TiO2/CNTs composites generate green products, i.e.,NO3 – , HNO3, etc. with 10%, 10.1%, and 41.25% after 30 min under visible light illumination, respectively. We also found that ZnO/CNTs easily inactivated the photocatalytic ability and converted NO gas to a moretoxic product. Meanwhile, the highest selectivity of green products conversion belongs to SnO2/CNTsnanocomposite. Our findings will design and select an excellent photocatalytic oxidation system forNOx removal towards a flue gas treatment established.
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Micropropagation from root segments to improve seedling quality in Chinese foxglove crops
Thanh Loan Pham,Van Huy Nguyen,Thi Le Thu Hoang,Thi Tam Tien Ha,Trung Kien Tran,Xuan Duong Vu,Phi Bang Cao,Quang Trung Nguyen 한국식물생명공학회 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.3
This is the first study to establish a complete protocol for micropropagation of Rehmannia glutinosa from root segments. The study involved investigating the effect of plant growth regulators on in vitro shoot regeneration and rooting and identifying substrates supporting survival and growth performance of ex vitro seedlings. A Murashige and Skoog (MS) medium containing 30 g/L sucrose for shoot induction and 0.2 mg/L indole-3-acetic acid (IAA), 1 mg/L 6-benzylaminopurine (BAP), and 1 g/L polyvinylpyrrolidone (PVP) for shoot multiplication resulted in the highest number of shoots per explant and shoot height. Applying a medium containing 0.5 mg/L IAA and 1 g/L PVP yielded optimal rooting of the shoots grown in vitro. Compost enriched with microbial inoculants and perlite enhanced seedling growth better than that with organic biofertilizer-free substrates (soil and sand). We recommend the continuous production of micropropagated R. glutinosa seedlings from root segments under the aforementioned conditions as a possible propagation technique for crops of this species.
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