UROP Proceedings 2020-21

School of Engineering Department of Civil and Environmental Engineering 92 Recyclable Hydrogel-Based Brick for Construction on Mars: A Feasibility Study Supervisor: QIU Jishen / CIVL Student: NGAN Man Cheuk / CIGBM Course: UROP3100, Spring This study aims at investigating the efficiency of recycling hydrogel from the hydrogel-based bricks and the impact to the gel’s mechanical properties after recycling. Our research object is Gelatin as it provides high recyclability with little requirement of additional chemical agents and environment condition. Compression tests and SEM analysis are conducted to examine the impact of recycling bricks to the stress, elastic modulus and failure modes of the bricks. The gel extraction process by heating with water can obtain 80% of the original gel adhered on the surface of ceramic beads and new bricks made with gel extracted can maintain a compressive strength of 6.55MPa, which is about 63% of the original strength before recycling. DESR (Data-Enabled Scalable Research) Lab - Incubator of Creative Learners and Hub of Transformation Supervisor: WANG Yu-Hsing / CIVL Student: LEE Jae Yeol / MATH-AM Course: UROP1100, Spring Risk assessments of trees has been a crucial challenge, especially in Hong Kong where the city is densely populated and frequently faces typhoons. Fatal accidents regarding tree failures have constantly been reported, particularly during the super typhoon Mangkhut. To check the internal state and structure of the tree, sonic tomograph and electrical tomograph have been used. It is a vital technique in measuring the damage of the tree and whether tree failures will happen or not. Tree pulling test is also a renowned experiment method of inspecting tree motions that occur under varying weather conditions. The details of the technique LiDAR in extracting tree data points will be discussed, as well as the procedures of the tomography. Internet of Tree Things (IOTT) Supervisor: WANG Yu-Hsing / CIVL Student: CHAN Chun Yu / SENG Course: UROP1100, Fall The first part of this report will focus on the introduction of IOTT. This report will first introduce IOTT and compare it with LiDAR. LiDAR is an alternative method to measure the tree movement. This comparison can reflect the merits and drawbacks of IOTT. The second part of the report will focus on tree selection. This report will share some special tree conditions that should be cautious. The third part of this report will focus on sensor manufacture. This report will include the procedure and difficulties of building a printed circuit board for a sensor and introduce how NeoDen 4 can advance the manufacture. Finally, the fourth part of the report will focus on the data analysis after receiving raw data. This report will introduce a method to calibrate those raw data and share some results.

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