109Chung HoangNGUYEN 110HA-BANG BAN111Thi To Nga Phan Production of nanocellulose-coated paperboard from sugarcane bagasse for the fabrication of food and drink self biodegradable containers to replace single-use plastic items(Project 2020)Developing Metaheuristic Techniques for Solving Optimization Problems in Transportation for Post-Disaster Responses and Energy Savings(Project 2020)Synthesis of porous LaFeO3 with enhanced toxic gas sensing properties(Project 2020)72The goal of this project is to develop a self-biodegradable product that can be used to replace single-use plastic items in food and beverage applications. Sugarcane bagasse - an abundant by-product of the sugar industry in Vietnam - is utilized for the production of pulp using the alkaline pulping method. Sugarcane bagasse pulp is used to make paperboard with a basis weight of 200 - 250 g/m2, which is then coated with nanocellulose prepared from sugarcane bagasse pulp. Subsequently, paper cups are fabricated from the nanocellulose-coated paperboard and evaluated properties for applications as food and drink containers. Nanocellulose can replace plastics, aluminum, and other non-degradable polymers, which are currently used in single-use items and makes our product be able to be composted and/or recycled afterward. The success of this project will contribute massively to environmental protection and the sustainable development of Vietnam.In this project, we are interested in the class of problems that has many practical applications in many real situations such as energy savings, life sciences, and post-disaster responses. They are: Time-Dependent Traveling Salesman Problem, Deliveryman Problem with Time Windows, and Multiple Minimum Back-Walk-Free Latency Problem. We have developed efficient metaheuristic algorithms for these problems that outperform than the state-of-the-art algorithms. Extensive numerical experiments and comparisons with the other metaheuristic algorithms in the literature show the efficiency of the algorithms.In this study, a NH3 gas sensing material, porous spherical LaFeO3 (PS-LFO) sample was prepared using a simple hydrothermal method. Structural and microstructural characterizations were performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRD investigation confirmed the formation of porous spherical LaFeO3 with a perovskite phase. TEM and SEM results revealed the porous structure of the material. Fourier transform infrared spectroscopy (FT-IR) was carried out to determine the presence of functional groups. Orthorhombic porous spherical LaFeO3 calcined at 700oC was used as a gas-sensing material for ammonia gas. The results showed that the sensor based on the PS-LFO exhibited p-type gas sensing behavior with good sensitivity, rapid response, and sub-ppm detection limit to ammonia gas at 325oC.
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