UROP Proceedings 2020-21

School of Science Department of Mathematics 49 A Machine Learning Approach to Study the Relationship between Urban Morphology and Urban Heat Island Supervisor: FUNG Jimmy Chi Hung / MATH Student: CHEUNG Cheuk Lun Alan / MATH-IRE Course: UROP1100, Summer Gas chromatography-mass spectrometry (GC-MS) is one of the most commonly used methods to analyse the trace of organic pollutants in the air. In Gas chromatography, sample gas passes through a capillary column that separates different components in the sample gas, resulting in different retention times of different components. Combined with mass spectra, GC-MS shows the various components inside sample gas and their abundance. A Machine Learning Approach to Study the Relationship between Urban Morphology and Urban Heat Island Supervisor: FUNG Jimmy Chi Hung / MATH Student: HE Qihao / DSCT Course: UROP1100, Summer Urban Morphology involves various continuous features such as building height and area that correlate closely with Urban Heat Island (UHI) phenomenon and Land Surface Temperature (LST). This study applies the Feedforward Neural Network (FNN) machine learning approach in an attempt to quantify the relationship between 9 urban variables and LST in the Pearl River Delta region. Various sets of hyperparameters have been tested out. A 9-32-16-1 network structure is proved to outperform the traditional linear regression model by comparing the correlation coefficient between test set actual LST values and predicted values produced by the model. Further improvements in the current NN model are possible with improvements on data and model hyperparameters. Retrieving of Urban Morphology from Satellite Images and Machine Learning Supervisor: FUNG Jimmy Chi Hung / MATH Student: MAK Chi Yuen Kevin / DSCT Course: UROP1000, Summer Hydrochar is a product of the hydrocarbonization of biomass, which is obtained in the form of slurry, a mixture of liquid and solid. It could be produced with either dry or wet biomass, with water added during the hydrothermal carbonization process. This report considers the effects on soil properties when hydrochar with coffee ground as feedstock is mixed into completely decomposed granite soil (CDG), as soil amendment is known to be an important application of hydrochar. Apart from the hydrochar, similar experiments are carried out with its feedstock. This report would compare their effects on soil strength, which appeared to be rather diverse in terms of soil cohesion and friction angle.

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