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Abstract Knowledge tracing (KT) aims to estimate the temporal evolution of learners’ knowledge states and predict future exercise performance. Most existing KT methods focus on exercise-response sequences and therefore cannot explicitly distinguish knowledge exposure through learning resources from knowledge verification through problem solving.
Fracturing is a key stimulation measure in hydrocarbon exploration and development. The proppant, which is the core material in fracturing, is the key in improving the fracturing success rate and the stimulation effect. The coated proppant is made by coating a polymer resin on the aggregate body of the traditional proppant. The coated proppant has the low density, high strength, and low crushing rate and is widely used in reservoir fracturing and sand control.
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